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"[Lapangan “BINTANG” berada di Cekungan Jawa Timur. Formasi target adalah Formasi Ngimbang yang memiliki beberapa zona target dengan ketebalan antara 20-40meter yang berada dibawah ketebalan tuning seismik. Zona-A dan Zona-C merupakan zona target penelitian. Formasi Ngimbang pada daerah penelitian, memiliki lithologi karbonat dan shale, sehingga perlu untuk memisahkan kedua lithologi kedua melalui data seismik. Data sumur test produksi daerah penelitian menunjukkan keberadaan hidrokarbon. Berdasarkan analisa sensitifitas, parameter P-Impedance dan Mu-Rho digunakan untuk memisahkan lithologi daerah penelitian. Daerah reservoar yang merupakan batuan karbonat berada pada nilai P-Impedance dan Mu-Rho kecil diatas cuttoff. Parameter Lambda-Rho*Poisson Ratio digunakan untuk mengidentifikasi sebaran hidrokarbon dimana zona bernilai kecil merupakan daerah yang mengindikasikan sebaran hidrokarbon.Inversi dilakukan dengan metode Extended Elastic Impedance (EEI) dimana metode ini menghasilkan volum reflektifitas langsung dari parameter yang dipilih. Inversi dengan metode EEI yang diaplikasikan dengan parameter Mu-Rho paling baik menggunakan sudut korelasi -45 dan untuk parameter Lambda-Rho*Poisson Ratio menggunakan sudut 33,5. Proses multiatribut digunakan untuk memprediksi sebaran porositas. Hasil multiatribut menunjukkan bagian utara daerah penelitian merupakan daerah yang lebih dangkal sehingga porositas lebih tinggi dibanding daerah selatan arahtenggara. Daerah utara masih berada pada bagian lagoonal sedangkan arah selatan-tenggara merupakan outer margin yang semuanya berada pada lingkungan pengendapan platform carbonate.

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"BINTANG" field is located in the East Java basin. The target formation is Ngimbang Formation which have several target zones with thickness between 20-40 meters which is below seismic tuning thickness. Zone-A and Zone-C is the target zone. Formation Ngimbang in this study area has carbonate and shale lithology, so that needs to seperate this two lithology by seismic data. From the sensitivity analysis, parameter P-Impedance and Mu-Rho used to separate the lithology in the study area. Carbonate rocks reservoir is at value of PImpedance and Mu-Rho small above the cuttoff. Parameter Lambda-Rho*Poisson Ratio used to identify the distribution of hydrocarbons, which small value area indicates the distribution of hydrocarbons. Inversion is performed using the extended elastic impedance (EEI) method which directly produces the reflectivity volume of the parameters has been selected. Inversion with EEI method which applied with Mu-Rho parameter best correlation angle is -45 and for Lambda-Rho*Poisson Ratio parameter is 33,5. Multiatributte process used to predict the porosity. Multiattribute results show that the northern part of study area is shallow area, that porosity is higher than the southern of the southeast regions. Northern areas are still located on the lagoonal while the south-southeast is the outer margin area which all area in platform carbonate depositional environments.;"BINTANG" field is located in the East Java basin. The target formation is Ngimbang Formation which have several target zones with thickness between 20-

40meters which is below seismic tuning thickness. Zone-A and Zone-C is the target zone. Formation Ngimbang in this study area has carbonate and shale lithology, so that needs to seperate this two lithology by seismic data. From the sensitivity analysis, parameter P-Impedance and Mu-Rho used to separate the lithology in the study area. Carbonate rocks reservoir is at value of PImpedance and Mu-Rho small above the cuttoff. Parameter Lambda-Rho*Poisson Ratio used to identify the distribution of hydrocarbons, which small value area indicates the distribution of hydrocarbons.

Inversion is performed using the extended elastic impedance (EEI) method which directly produces the reflectivity volume of the parameters has been selected. Inversion with EEI method which applied with Mu-Rho parameter best correlation angle is -45 and for Lambda-Rho*Poisson Ratio parameter is 33,5. Multiatributte process used to predict the porosity. Multiattribute results show that the northern part of study area is shallow area, that porosity is higher than the southern of the southeast regions. Northern areas are still located on the lagoonal while the south-southeast is the outer margin area which all area in platform carbonate depositional environments.;"BINTANG" field is located in the East Java basin. The target formation is

Ngimbang Formation which have several target zones with thickness between 20-

40meters which is below seismic tuning thickness. Zone-A and Zone-C is the

target zone. Formation Ngimbang in this study area has carbonate and shale

lithology, so that needs to seperate this two lithology by seismic data.

From the sensitivity analysis, parameter P-Impedance and Mu-Rho used to

separate the lithology in the study area. Carbonate rocks reservoir is at value of PImpedance

and Mu-Rho small above the cuttoff. Parameter Lambda-Rho*Poisson

Ratio used to identify the distribution of hydrocarbons, which small value area

indicates the distribution of hydrocarbons.

Inversion is performed using the extended elastic impedance (EEI) method

which directly produces the reflectivity volume of the parameters has been

selected. Inversion with EEI method which applied with Mu-Rho parameter best

correlation angle is -45 and for Lambda-Rho*Poisson Ratio parameter is 33,5.

Multiatributte process used to predict the porosity. Multiattribute results

show that the northern part of study area is shallow area, that porosity is higher

than the southern of the southeast regions. Northern areas are still located on the

lagoonal while the south-southeast is the outer margin area which all area in

platform carbonate depositional environments.;"BINTANG" field is located in the East Java basin. The target formation is

Ngimbang Formation which have several target zones with thickness between 20-

40meters which is below seismic tuning thickness. Zone-A and Zone-C is the

target zone. Formation Ngimbang in this study area has carbonate and shale

lithology, so that needs to seperate this two lithology by seismic data.

From the sensitivity analysis, parameter P-Impedance and Mu-Rho used to

separate the lithology in the study area. Carbonate rocks reservoir is at value of PImpedance

and Mu-Rho small above the cuttoff. Parameter Lambda-Rho*Poisson

Ratio used to identify the distribution of hydrocarbons, which small value area

indicates the distribution of hydrocarbons.

Inversion is performed using the extended elastic impedance (EEI) method

which directly produces the reflectivity volume of the parameters has been

selected. Inversion with EEI method which applied with Mu-Rho parameter best

correlation angle is -45 and for Lambda-Rho*Poisson Ratio parameter is 33,5.

Multiatributte process used to predict the porosity. Multiattribute results

show that the northern part of study area is shallow area, that porosity is higher

than the southern of the southeast regions. Northern areas are still located on the

lagoonal while the south-southeast is the outer margin area which all area in

platform carbonate depositional environments.;"BINTANG" field is located in the East Java basin. The target formation is

Ngimbang Formation which have several target zones with thickness between 20-

40meters which is below seismic tuning thickness. Zone-A and Zone-C is the

target zone. Formation Ngimbang in this study area has carbonate and shale

lithology, so that needs to seperate this two lithology by seismic data.

From the sensitivity analysis, parameter P-Impedance and Mu-Rho used to

separate the lithology in the study area. Carbonate rocks reservoir is at value of PImpedance

and Mu-Rho small above the cuttoff. Parameter Lambda-Rho*Poisson

Ratio used to identify the distribution of hydrocarbons, which small value area

indicates the distribution of hydrocarbons.

Inversion is performed using the extended elastic impedance (EEI) method

which directly produces the reflectivity volume of the parameters has been

selected. Inversion with EEI method which applied with Mu-Rho parameter best

correlation angle is -45 and for Lambda-Rho*Poisson Ratio parameter is 33,5.

Multiatributte process used to predict the porosity. Multiattribute results

show that the northern part of study area is shallow area, that porosity is higher

than the southern of the southeast regions. Northern areas are still located on the

lagoonal while the south-southeast is the outer margin area which all area in

platform carbonate depositional environments., "BINTANG" field is located in the East Java basin. The target formation is

Ngimbang Formation which have several target zones with thickness between 20-

40meters which is below seismic tuning thickness. Zone-A and Zone-C is the

target zone. Formation Ngimbang in this study area has carbonate and shale

lithology, so that needs to seperate this two lithology by seismic data.

From the sensitivity analysis, parameter P-Impedance and Mu-Rho used to

separate the lithology in the study area. Carbonate rocks reservoir is at value of PImpedance

and Mu-Rho small above the cuttoff. Parameter Lambda-Rho*Poisson

Ratio used to identify the distribution of hydrocarbons, which small value area

indicates the distribution of hydrocarbons.

Inversion is performed using the extended elastic impedance (EEI) method

which directly produces the reflectivity volume of the parameters has been

selected. Inversion with EEI method which applied with Mu-Rho parameter best

correlation angle is -45 and for Lambda-Rho*Poisson Ratio parameter is 33,5.

Multiatributte process used to predict the porosity. Multiattribute results

show that the northern part of study area is shallow area, that porosity is higher

than the southern of the southeast regions. Northern areas are still located on the

lagoonal while the south-southeast is the outer margin area which all area in

platform carbonate depositional environments.]"

"Cekungan Jawa Timur Utara merupakan salah satu cekungan penghasil minyak dan gas terbesar di Indonesia. Intepretasi seismik secara kuantitatif sangat diperlukan dalam proses eksplorasi keberadaan cadangan hidrokarbon. Atribut seismik inversi simultan dan amplitude vs offset (AVO) adalah metode yang diaplikasikan pada penelitian ini. Seismik inversi adalah metode untuk menghasilkan parameter dari data seismik refleksi dengan pengikatan dengan data sumur. Inversi seismik pada studi ini adalah inversi simultan untuk mengestimasi kecepatan gelombang P (Vp), kecepatan gelombang S (Vs), densitas dan rasio Vp/Vs batuan untuk ditransformasi ke parameter Lambda – Mu – Rho yang dapat dimanfaatkan sebagai parameter untuk memprediksi kandungan fluida dan jenis litologi dibawah permukaan. Nilai rasio Vp/Vs dan densitas dihasilkan dengan baik dari proses inversi simultan dan dapat memisahkan antara karbonat tersaturasi hidrokarbon dengan nilainya yang kecil. Ampllitude vs offset (AVO) adalah metode untuk melihat perubahan amplitude seiring bertambahnya offset atau sudut. Dengan tersaturasinya gas pada suatu batuan, akan menghasilkan respon yang berbeda dengan saturasi minyak atau air. Pada penilitian ini didapatkan dengan keberadaan saturasi gas, nilai intercept akan semakin kecil dibanding dengan minyak atau air. Nilai lambda-rho berhasil mendefinisikan keberadaan karbonat gas dengan nilai kecil.

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The North East Java Basin is one of the largest oil and gas producing basins in Indonesia. Quantitative seismic interpretation is needed in the exploration process for the presence of hydrocarbon reserves. The seismic attribute simultaneous inversion and amplitude vs offset (AVO) is the method applied in this study. Seismic inversion is a method for generating parameters from seismic reflection data by binding to well data. Seismic inversion in this study is a simultaneous inversion to estimate the P wave velocity (Vp), S wave velocity (Vs), rock density, and Vp / Vs ratio to be transformed into Lambda - Mu - Rho parameters which can be used as parameters to predict fluid content and type of subsurface lithology. The value of the Vp / Vs ratio and the density is generated well from the simultaneous inversion process and can separate the hydrocarbon saturated carbonates with small values. Amplitude vs offset (AVO) is a method of seeing the change in amplitude as the offset or angle increases. With the saturation of gas in a rock, it will produce a different response to the saturation of oil or water. In this research, it was found that in the presence of gas saturation, the intercept value will be smaller than that of oil or water. The lambda-rho value defines the presence of gaseous carbonates with small values"

"Membangun suatu model geologi dan mengkarakterisasi reservoir karbonat Miocene di Asia Tenggara merupakan suatu tantangan. Banyaknya sistem deposisi sedimen ditambah struktur yang kompleks dapat mempengaruhi hasil pemodelan, khususnya disebabkan oleh modifikasi porositas dan transformasi permeabilitas karbonatnya. Karakterisasi reservoir dilakukan untuk mengetahui karakter batuan reservoir, litologi, serta kandungan fluida dengan menggunakan metode inversi simultan dan LMR (Lambda-Mu-Rho). Metode inversi Simultan memiliki kelebihan yaitu dapat menghasilkan impedansi-S, sehingga sifat elastik batuan dapat diketahui. Selain itu, dengan metode LMR, dapat dihasilkan model Mu-Rho dan Lambda-Rho yang dapat menjelaskan litologi dan kandungan fluida. Objek penelitian ini adalah blok ?SS? pada Basin Sumatra Utara di provinsi Aceh, Indonesia dengan reservoir yang didominasi limestone berbentuk build-up pada formasi Peutu. Penelitian ini menggunakan data seismik gather 3D PSTM dengan kontrol 4 sumur berbeda. Data gather dibagi ke dalam tiga domain sudut berbeda (near angle, mid angle, dan far angle) untuk menganalisis pengaruh sudut datang gelombang. Analisis pra-inveri menunjukkan nilai error yang minimum, ± 3.5 % untuk model impedansi-P, dan ± 2.3 % untuk model impedansi-S. Hasil analisis terintegrasi menunjukkan bahwa daerah prospek dapat diketahui dan berada pada build-up formasi Peutu di sekitar sumur SS-09. Daerah tersebut merupakan daerah porous dengan nilai 9000-12500 m/s*g/cc pada model impedansi-P dan 4500-7200 m/s*g/cc pada model impedansi-S. Zona potensial tersebut berada pada litologi limestone dengan nilai Mu-Rho 35-53 GPa*g/cc dan terdapat kandungan gas dengan nilai Lambda-Rho 30-50 GPa*g/cc.

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Building geological model and reservoir characterization of Lower Miocene carbonate reservoir in South East Asia region is a huge challenge. Dynamic depositional system of sediments combined with complex structures give a certain degree of complication in reservoir properties, especially due to carbonate?s porosity modification and change in permeability transform. The objective of reservoir characterization are to determine the reservoir properties, lithology, and fluid content by using simultaneous inversion and LMR (Lambda-Mu-Rho). The ability to determine rocks? elastic properties is an advantage of simultaneous inversion from its shear impedance model. Besides, LMR will provide Lambda-Rho to determine fluid content, and Mu-Rho for lithology. The object of this study is ?SS? field in North Sumatra Basin which located in Aceh Province, Indonesia. Peutu formation is the reservoir in this Basin, dominated by build-up limestone. This study use 3D PSTM seismic gather with 4 different wells as a control. Seismic gather then transformed into three different angle gathers (near angle, mid angle, and far angle) to analyze the effect of angle of incident. Inversion analysis shows the minimum error, ± 3.5 % for Zp, and ± 2.3 % for Zs. Integrated analysis indicate that potential zone is identified in Peutu build-up near SS-09 well. The area are porous with 9000-12500 m/s*g/cc in Zp model and 4500-7200 m/s*g/cc in Zs model. Lithology of the potential zone is a limestone with 35-53 GPa*g/cc in Mu-Rho and gas shown with 30-50 GPa*g/cc in Lambda-Rho."

"Metoda inversi simultan merupakan salah satu metoda yang digunakan dalam proses AVO inversion, yang didalam prosesnya mengolah input seismik 'partial stacking' dalam satu proses untuk menghasilkan volume seismik untuk parameter elastik dan impedansi, kemudian metoda Lambda Mu Rho merupakan metoda yang menggunakan parameter elastik dalam analisisnya, dimana Lambda merupakan parameter incompressibilitas, yaitu kemampuan batuan dalam terbentuknya perubahan volume apabila terkena stress dan Mu merupakan parameter rigiditas dari batuan, yaitu kemampuan batuan dalam perubahan bentuk apabila terkena stress. Lapangan F yang mempunyai 2 reservoir dominan, yang pertama pada reservoir dalam Formasi Talang Akar dan yang kedua dalam Formasi Lemat, sehingga dalam rencana pengembangan lapangan diperlukan seimik modeling dari reservoir tersebut untuk pengurangan resiko dalam pemboran sumur pengembangan dalam hal ini menggunakan metoda Inversi Simultan dan Lambda Mu Rho. Metoda yang digunakan ini diharapkan dapat menggambarkan keberadaan dari reservoir batu pasir serta dapat membedakan antara reservoir yang mengandung fluida hidrokarbon dan yang tidak.

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Simultaneous Inversion is a method that used in the AVO inversion, that process the partial stacking as input and the elastic parameter and impedances as output in one batch, then Lambda Mu Rho is a method that used elastic parameter for the analysis, which is Lambda as the incompressibility parameter, the ability of rocks to transform in their volume when have a stress and Mu as the rigidity parameter, the ability of rocks to transform in their shape when have a stress. The F field has 2 dominant reservoirs, first the reservoir in the Talang Akar Formation and the second reservoir in the Lemat Formation, so in the development plan need a seismic modeling for the reservoir to minimize the risk of the next development wellbore, in this case using simultaneous inversion and lambda mu rho. This method hopefully could distinguished the reservoir of sandstones which filled by hydrocarbon fluids from the wet sand."

"Metode seismik merupakan suatu metode geofisika yang hingga saat ini merupakan metode dipercaya dapat memberikan gambaran bawah permukaan dari suatu lapangan. Seismik inversi adalah salah satu dari banyak metode yang digunakan untuk karakterisasi reservoar. Dengan menggunakan inversi seismik simultan mampu mendapatkan jawaban yang lebih pasti dengan cara menganalisa impedansi P, impedansi S dan densitas. Lapangan X, pada zona dangkal merupakan zona produksi yang cukup menjanjikan. Sehingga, pengembangan pada zona ini cukup gencar. Namun, beberapa kali prediksi reservoar meleset dikarenakan lapisan coal yang melimpah. Sebelum melakukan analisa inversi seismik simultan, perlu diketahui terlebih dahulu hubungan sifat fisik batuan (Zp, Zs, VpVs, lamda-rho dan mhu-rho) dengan properti batuannya (densitas dan porositas). Studi kelayakan dilakukan dengan cara melakukan cross plot parameter fisik batuan untuk dapat mendefinisikan litologi dan fluida yang ada. Selanjutnya well-seismic tie dilakukan untuk mendapatkan korelasi dan koherensi antara data dari log sumur dengan data seismik. Interpretasi horison, struktur dan pembuatan model frekuensi rendah dilakukan untuk memahami keadaan geologi dari daerah penelitian. Pada akhirnya, inversi seismik simultan dapat dilakukan dengan tepat. Hasil dari analisa inversi seismik simultan adalah kisaran nilai Zp, Zs dan Dn untuk mengkarakterisasi reservoar. Selain itu, analisa mengenai LMR (lamda-mhurho) juga dilakukan untuk mendapatkan hasil yang lebih baik. Sehingga, persebaran reservoar pada daerah penelitian dapat diketahui.

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Seismic is one of the methods in geophysics that until now still reliable for sub-surface imaging and interpretation of a field. Seismic inversion is one of the methods to characterize the reservoir. Using simultaneous seismic inversion, analyzing the P-impedance, S-impedance and density can be more convenient and certain.

X Field, especially in the shallow zone is a promising production zone. Hence, development in this zone is very incentive. Unfortunately, miss prediction sometimes happens due to coal layer that abundant. Relationship between rock physic (Zp, Zs, Vp/Vs, lamda-rho and mhu-rho) and rock property (density and porosity) must be understood prior to simultaneous seismic inversion analysis. Feasibility study was conducted by cross plotting among some parameters to define the lithology and fluids.

Well-seismic tie was conducted to have a good correlation and coherency between well-log data and seismic data. Horizon, structural interpretation and low frequency model were performed to have geological understanding of research area. The result of series steps previously then analyzed to have a good quality data. Eventually, the simultaneous seismic inversion can be performed in a proper way.

Result of the simultaneous seismic inversion analysis is a value of Zp, Zs and Dn for reservoir characterization. Moreover, LMR (lamda-mhu-rho) analysis can be performed to give more preferable result. Eventually, the distribution of gas-sand reservoir can be understood."

"Studi inversi seismik EI dan LMR untuk lapangan Blackfoot telah dilakukan untuk mengidentifikasi distribusi reservoar dan kandungan fluidanya. Lapangan blackfoot merupakan lapangan gas dan minyak dengan reservoarnya merupakan karbonat yang berada pada kedalaman sekitar 1555 m, dengan dominasi lapisan glauchonit. Studi ini menggabungkan antara metode inversi elastik impedansi dan metode lambda-mu-rho, dengan harapan dapat mengkarakterisasi reservoar terutama dalam memisahkan kandungan fluida dan memberikan informasi yang signifikan tentang perbedaan litologinya. Konsep inversi EI dan LMR mengacu pada perubahan rasio Vp/Vs yang dapat memberikan dampak yang besar kepada nilai lambda dan mu. Parameter lame`s yang berasosiasi dengan incompresibilitas, diharapkan mampu memberikan informasi tentang fluida yang mengisi pori batuan, sementara parameter mu yang berasosiasi dengan regiditas dapat memberikan informasi terkait jenis batuan. Pada implementasinya data seismik prestack diolah untuk mendapatkan berbagai macam penampang baik itu Rp, Rs, Near stack, Far Stack untuk digunakan sebagai input dalam berbagai proses inversi. Dengan demikian hasil inversi diharapkan bisa menyebarkan secara lateral sensitifitas LMR yang dimiliki oleh setiap sumur untuk memberikan informasi yang signifikan baik dalam hal membedakan litologi, maupun informasi keberadaan fluida.

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Seismic inversion study of EI and LMR for Blackfoot field has been done to identify the distribution of Reservoar properties and fluid content. Blackfoot field is an oil and gas field with a carbonate Reservoar located at a depth of approximately 1555 m, with the dominance glauchonit layer. This study combines elastic impedance inversion method and the method of the lambda-mu-rho, in hopes of Reservoar characterization, especially in separating the fluid content and provide significant information about the differences in lithology. EI and LMR inversion concept refers to changes in the ratio Vp / Vs that can give a big impact to the value of lambda and mu. Lame`s parameters associated with incompressibility, are expected to provide information about the fluid that fills the pores of rocks, while the parameters associated with regiditity you can provide Information related to the rock type. In implementation prestack seismic data is processed to obtain various kinds of good cross-section was Rp, Rs, Near stack, Far Stack to be used as input in the inversion processes. So the result of inversion is expected to spread laterally LMR sensitivity of each of the wells to provide significant information both in terms of distinguishing lithology, as well as information on the presence of fluid."

"[Lapangan AAA merupakan salah satu lapangan gas terbesar di Indonesia. Karakteristik reservoir bagian dangkal lapangan ini berupa batuan pasir dengan lingkungan pengendapan fluvio deltaik berupa channel yang tebal dan diisi gas pada formasi Kampung Baru. Untuk pemetaan reservoir dan hidrocarbon di daerah ini, tidak dapat dilakukan dengan metode inversi akustik impedance (AI) karena padakasus ini AI tidak dapat digunakan untuk memisahkan jenis litologi. Dari hasil analisa sensitivitas didapatkan informasi bahwa log densitas dan log Gamma Ray (GR) dapat digunakan untuk memisahkan lithology dan log Lamda-Rho (LR), VP/VS, Poison’s Ratio (PR), Lamda/Mu (L/M) dapat digunakan untuk memisahkan fluida. Metode inversi simultan digunakan untuk menghitung atribut densitas dan LR dari seismik sehingga dapat diketahui sebaran litologi dan fluida pada daerah ini. Untuk selanjutnya hasil inversi tersebut digunakan dalam pemodelan geologi statik untuk menghitung cadangan. Hasil inversi simultan memperlihatkan ada dua daerah prospek yang besar yaitu padadaerah sumur 3A55 atau segmen AA dan daerah sumur 3G51 atau segmen G. Kedua prospek ini berada pada zona antara marker MFB-MF1 tepatnya pada zona A205 pada model statik yang telah di buat. Hasil perhitungan cadangan pada zona ini di dapatkan cadangan sebesar setengah dari total cadangan area yang di pelajari padapenelitian ini.;AAA field is one of the largest gas fields in Indonesia. Reservoir characteristics of the shallow part of this field are sandstone with depositional environment fluvio deltaik with thick channel and the gas filled formation of Kampung Baru. Reservoirs and hydrocarbon mapping in this area, cannot be done with an acoustic impedanceinversion method (AI) because of the results of the sensitivity analysis AI cannot separate the existing lithology and fluid. From the results of the sensitivity analysis is also obtained information that the log density and log Gamma Ray (GR) can be used to separate lithology and log Lamda-Rho (LR), VP / VS, Poison's Ratio (PR), Lamda / Mu (L / M) can be used to separate the fluid. Simultaneous inversion method is used to calculate the density and LR attribute that can be known from this attribute the lithology and fluid distribution in this area. Then the result of the seismic attribute was used in geology static model building process for volume calculation purpose. Simultaneous inversion results shows that there are two major areas, namely the prospect area or segment of the 3A55 well areas or segment AA and 3G51 well areasor segment G. Both of these prospects located in the zone between the MFB-MF1 markers exactly on the A205 zone on static models that have been made. The result of calculation of reserves in this zone is half of the total reserves in this studied area, AAA field is one of the largest gas fields in Indonesia. Reservoir characteristics of theshallow part of this field are sandstone with depositional environment fluvio deltaikwith thick channel and the gas filled formation of Kampung Baru. Reservoirs andhydrocarbon mapping in this area, cannot be done with an acoustic impedanceinversion method (AI) because of the results of the sensitivity analysis AI cannotseparate the existing lithology and fluid. From the results of the sensitivity analysis isalso obtained information that the log density and log Gamma Ray (GR) can be usedto separate lithology and log Lamda-Rho (LR), VP / VS, Poison's Ratio (PR), Lamda/ Mu (L / M) can be used to separate the fluid.Simultaneous inversion method is used to calculate the density and LR attribute thatcan be known from this attribute the lithology and fluid distribution in this area. Thenthe result of the seismic attribute was used in geology static model building processfor volume calculation purpose.Simultaneous inversion results shows that there are two major areas, namely theprospect area or segment of the 3A55 well areas or segment AA and 3G51 well areasor segment G. Both of these prospects located in the zone between the MFB-MF1markers exactly on the A205 zone on static models that have been made. The result ofcalculation of reserves in this zone is half of the total reserves in this studied area]"

"Emisi CO2 yang tinggi dari sektor minyak dan gas menjadi salah satu perhatian masyarakat global maupun pemerintah Indonesia. Salah satu cara yang dapat diterapkan untuk mengurangi emisi CO2 adalah dengan penerapan Carbon Capture and Storage (CCS). Kegiatan CCS adalah penangkapan emisi CO2 yang dihasilkan oleh industri dan disimpan kembali ke bawah permukaan. Dari beberapa lokasi yang dapat digunakan untuk penyimpanan karbon, reservoir minyak dan gas yang telah lama beroperasi dapat digunakan.Lapangan “IN” yang berada di Cekungan Asri, Sumatera Tenggara telah berproduksi selama lebih dari 50 tahun dikatakan merupakan kandidat yang cocok untuk dilakukan penelitian lebih lanjut sebagai lokasi penerapan CCS. Dalam penelitian ini, dilakukan pendekatan geofisika dari data seismik dan data sumur untuk mengidentifikasi litologi, porositas, dan struktur yang ada untuk mencari rekomendasi lokasi sumur injeksi dan penyimpanan karbon. Inversi simultan dilakukan untuk mengkarakterisasi litologi dengan lebih baik dengan menghasilkan tiga parameter sekaligus secara simultan, yakni impedansi akustik, impedansi shear, dan densitas. Dari hasil inversi simultan ini, digunakan hasil inversi parameter Mu-Rho yang berasal dari impedansi shear dan Poisson’s Ratio yang berasal dari rasio VpVs. Hasil yang diperoleh adalah keterdapatan litologi batu pasir, batu bara, shale, dan shaleous carbonate. Hasil inversi juga digunakan kembali untuk mengestimasi persebaran porositas dengan nilai 0,025 – 0,275. Setelah itu, hasil analisis litologi, porositas, dimodelkan dalam model struktur geologi untuk mengidentifikasi keberadaan struktur. Disimpulkan bahwa lokasi rekomendasi penerapan CCS yang ideal adalah pada satu sumur produksi yang berada di bagian tengah – utara daerah penelitian.

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High CO2 emission from oil and gas industry took global and even Indonesia’s Government attention. One of the solutions to decrease CO2 emission is by applying Carbon Capture and Storage (CCS). At CCS, the produced CO2 from industrial activity would be captured and stored to the subsurface. Among all of the ideal location to store the carbon, the depleted oil and gas reservoir could be used.

“IN” field, which located on Asri Basin, Southeast Sumatera, has been producing oil for more than 50 years. This field is quite fit to be done any research for CCS location candidate. In this research, the geophysical approach from seismic and well data is used to identify lithology, porosity, and structure to give location recommendation for carbon storage. Simultaneous inversion has been done to characterize lithology better by gives three parameters simultaneously, those are acoustic impedance, shear impedance, and density. From the inversion results, the Mu-Rho parameter from shear impedance and Poisson’s Ratio from VpVs Ratio are used. The use of these parameters is the distinguish of coal, sandstone, shale, and shaleous carbonate lithologies. The inversion results also used for porosity distribution estimation that shows value range of 0,025 – 0,275. In conclusion, the ideal location recommendation for CCS application is at one production wells located at the middle – northern area of interest."

"Karakterisasi reservoir merupakan salah satu tahap penting dalam eksplorasi hidrokarbon agar dapat menentukan reservoir yang baik berdasarkan karakteristik litologi dan kandungan fluida di reservoir. Penelitian ini dilakukan di Lapangan “R”, Cekungan Jawa Timur Utara dengan menggunakan metode inversi simultan. Berdasarkan hasil inversi simultan diketahui bahwa zona reservoir di area penelitian tersusun atas litologi karbonat dengan nilai impedansi-P 26.000 ft/s*g/cc – 35.000 ft/s*g/cc, impedansi-S 8.000 ft/s*g/cc – 22.000 ft/s*g/cc, dan densitas 2. g/cc – 2.39 g/cc. Hasil tersebut ditransformasikan menjadi parameter elastis batuan, yaitu Parameter Lame yang terdiri atas Lambda-Rho dan Mu-Rho. Transformasi Lambda-Mu-Rho berhasil mengidentifikasi reservoir karbonat yang berpotensi mengandung hidrokarbon dengan nilai rigiditas tinggi sebesar 6 GPa*g/cc – 21 GPa*g/cc dan inkompresibilitas rendah sebesar 6 GPa*g/cc – 11 GPa*g/cc yang diinterpretasikan sebagai gas. Integrasi analisis dari parameter impedansi-P, impedansi-S, densitas, Lambda-Rho, dan Mu-Rho menunjukkan bahwa persebaran batuan karbonat yang tersaturasi gas memiliki orientasi timur laut – barat daya.

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Reservoir characterization is one of the most crucial stages in hydrocarbon exploration to determine good reservoirs based on their lithology and fluid content. This research was conducted at the “R” Field, North East Java Basin using the simultaneous seismic inversion method. The results show that the reservoir zone in the research area consists of carbonate rocks with P-impedance values of 26.000 ft/s*g/cc – 35.000 ft/s*g/cc, S-impedance of 8.000 ft/s*g/cc – 22.000 ft/s*g/cc, and density of 2.25 g/cc – 2.55 g/cc. These results were transformed into rock elastic parameters, namely Lame Parameters consisting of Lambda-Rho and Mu-Rho. Lambda Mu Rho Transformation has successfully identified carbonate reservoirs that potentially contain hydrocarbons with high rigidity values of 6 GPa*g/cc – 21 GPa*g/cc and low incompressibility of 6 GPa*g/cc – 11 GPa*g/cc interpreted as gas. Integration analysis of P-impedance, S-impedance, density, Lambda-Rho, and Mu-Rho parameters shows that the distribution of gas-saturated carbonate rocks has a northeast – southwest orientation."

"Cekungan Sumatera Tengah merupakan salah satu daerah penghasil minyak dan gas bumi terbesar di Indonesia dengan salah satu reservoir yang potensial berada di formasi tualang dan lakat. Penelitian ini menggunakan metode multiatribut seismik dan analisis petrofisika untuk melakukan karakterisasi reservoir pada daerah penelitian. Analisis petrofisika bertujuan untuk mendapatkan parameter petrofisika yaitu volume shale, porositas, dan saturasi air. Batuan reservoir potensial pada penelitian ini memiliki nilai volume shale dengan rentang 0.1 hingga 0.3, nilai porositas efektif dengan rentang 0.144 hingga 0.253, dan nilai saturasi air dengan rentang 0.45 hingga 0.79. Analisis multiatribut bertujuan untuk melakukan penyebaran parameter petrofisika pada area penelitian. Berdasarkan analisis multiatribut seismik didapatkan persebaran zona reservoir sandstone potensial formasi tualang dan lakat terkonsentrasi di daerah tinggian antiklin di tengah dan tenggara area penelitian dengan rentang nilai volume shale dari 0.05 hingga 0.65 dan nilai porositas efektif dengan rentang 0.1 hingga 0.25. Zona tersebut berada pada daerah tinggian yang dikontrol oleh antiklin sesar yang berarah NW-SE sehingga zona tersebut memiliki potensi menjadi jebakan struktural hidrokarbon. Struktur antiklin ini juga mengendalikan proses migrasi sekunder dari formasi kelesa yang dikembangkan di graben yang terletak sekitar 15 km south east (tenggara) dari area penelitian.

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The Central Sumatra Basin is one of the largest oil and gas-producing regions in Indonesia, with one of its potential reservoirs located in the Tualang and Lakat formations. This study uses seismic multi-attribute method and petrophysical analysis to characterize the reservoir in the study area. The petrophysical analysis aims to obtain petrophysical parameters, namely shale volume, porosity, and water saturation. The potential reservoir rock in this study has a shale volume ranging from 0.1 to 0.3, effective porosity ranging from 0.144 to 0.253, and water saturation ranging from 0.45 to 0.79. The multi-attribute analysis aims to map the distribution of petrophysical parameters across the study area. Based on the seismic multi-attribute analysis, the distribution of potential sandstone reservoir zones in the Tualang and Lakat formations is concentrated in the anticline highs in the central and southeastern parts of the study area, with shale volume values ranging from 0.05 to 0.65 and effective porosity values ranging from 0.1 to 0.25. These zones are located in high areas controlled by NW-SE trending fault anticlines, suggesting that these zones have the potential to become hydrocarbon structural traps. This anticline structure also controls the secondary migration process from the Kelesa formation, which is developed in the Binio Trough, located approximately 15 kilometers southeast of the study area."