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Abstrak :
[ABSTRAK
Lapangan XXX merupakan lapangan minyak di cekungan Natuna Barat dengan reservoir utama berupa reservoir batu pasir. Ketebalan reservoir pada lapangan ini sangat bervariasi sehingga hasil inversi hanya dapat memetakan ketebalan reservoir yang mendekati ketebalan tuning. Berdasarkan uji sensitifitas, parameter AI di setiap sumur tidak dapat membedakan hidrokarbon, sehingga parameter akustik saja tidak dapat diaplikasikan dalam karakterisasi reservoir lapangan ini. Namun ketika parameter densitas terpisah dengan parameter kecepatan P, sebaran hidrokarbon dapat dibedakan dengan baik. Kecepatan S tidak tersedia di semua sumur padahal data ini sangat diperlukan untuk melakukan pengolahan data dengan metode inversi simultan. Oleh karena itu akan dilakukan beberapa estimasi untuk mendapatkan data kecepatan S antara lain dengan metode castagna, metode gassmann, metode parsial, metode Xu-White dan metode Lee. Data kecepatan S yang dipakai adalah kecepatan S terbaik yang diperoleh dari metode Xu White dikarenakan hasil log poisson’s rationya paling mendekati tren kurva saturasi air. Selain itu aspek rasio batuan yang mempertimbangkan nilai porositas dan volume clay, serta kontrol kualitas Vp model dari metode Xu-White memiliki rasio error minimum jika dibandingkan dengan nilai Vp dari data log. Metode inversi simultan dengan data pre-stack atau partial stack memungkinkan dilakukannya prediksi parameter Impedansi P, Impedansi S, dan densitas dari data seismik. Selain itu meode inversi simultan dapat dipergunakan multi wavelet dalam pengolahan datanya. Hasil penampang inversi yang diperoleh menunjukkan bahwa inverse densitas dapat menjelaskan letak sebaran batuan reservoir dan fluida berdasarkan cut off sensitifitas yakni nilai dibawah 2,26 gr/cc.

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ABSTRACT
field is an oil field in West Natuna Basin with sandstone reservoir as primary target. There was varying reservoir thickness, so the inversion method that could only be applied to map reservoir thickness, which close to tuning thickness. Based on sensitivity analysis, Acoustic Impedance parameters couldn’t indicate hydrocarbon appearance for each well, so Acoustic Impedance cannot be applied for reservoir characterization in this field. Density versus Acoustic Impedance could map hydrocarbon appearance. Shear velocity weren’t available where those data was needed for running simultaneous inversion method. Predicting velocity shear would be carried out by using several method such as Castagna, Gassmann, Parsial, Xu-White, and Lee. The best estimated velocity shear would be used for inversion, The best estimated shear velocity from Xu-White method because Xu-White’s poisson ratio log presents similar trend with water saturation log (Sw). Moreover, Xu-White’s ratio aspect is also considering porosity and clay volume value. Based on quality control result, Vp model of Xu-White had minimum error ratio compared to Vp from log. Simultaneous inversion with pre-stack and parsial stack data what can be used for predicting P-Impedance, S-Impedance, and density from seismic data. Otherwise, this method is also used not only for single wavelet but also multi wavelet. The inversion result from this study can mapping out the hydrocarbon appearance for reservoir target based on cut off value from sensitivity test of less than 2,26 gr/cc.;X field is an oil field in West Natuna Basin with sandstone reservoir as primary target. There was varying reservoir thickness, so the inversion method that could only be applied to map reservoir thickness, which close to tuning thickness. Based on sensitivity analysis, Acoustic Impedance parameters couldn’t indicate hydrocarbon appearance for each well, so Acoustic Impedance cannot be applied for reservoir characterization in this field. Density versus Acoustic Impedance could map hydrocarbon appearance. Shear velocity weren’t available where those data was needed for running simultaneous inversion method. Predicting velocity shear would be carried out by using several method such as Castagna, Gassmann, Parsial, Xu-White, and Lee. The best estimated velocity shear would be used for inversion, The best estimated shear velocity from Xu-White method because Xu-White’s poisson ratio log presents similar trend with water saturation log (Sw). Moreover, Xu-White’s ratio aspect is also considering porosity and clay volume value. Based on quality control result, Vp model of Xu-White had minimum error ratio compared to Vp from log. Simultaneous inversion with pre-stack and parsial stack data what can be used for predicting P-Impedance, S-Impedance, and density from seismic data. Otherwise, this method is also used not only for single wavelet but also multi wavelet. The inversion result from this study can mapping out the hydrocarbon appearance for reservoir target based on cut off value from sensitivity test of less than 2,26 gr/cc., X field is an oil field in West Natuna Basin with sandstone reservoir as primary target. There was varying reservoir thickness, so the inversion method that could only be applied to map reservoir thickness, which close to tuning thickness. Based on sensitivity analysis, Acoustic Impedance parameters couldn’t indicate hydrocarbon appearance for each well, so Acoustic Impedance cannot be applied for reservoir characterization in this field. Density versus Acoustic Impedance could map hydrocarbon appearance. Shear velocity weren’t available where those data was needed for running simultaneous inversion method. Predicting velocity shear would be carried out by using several method such as Castagna, Gassmann, Parsial, Xu-White, and Lee. The best estimated velocity shear would be used for inversion, The best estimated shear velocity from Xu-White method because Xu-White’s poisson ratio log presents similar trend with water saturation log (Sw). Moreover, Xu-White’s ratio aspect is also considering porosity and clay volume value. Based on quality control result, Vp model of Xu-White had minimum error ratio compared to Vp from log. Simultaneous inversion with pre-stack and parsial stack data what can be used for predicting P-Impedance, S-Impedance, and density from seismic data. Otherwise, this method is also used not only for single wavelet but also multi wavelet. The inversion result from this study can mapping out the hydrocarbon appearance for reservoir target based on cut off value from sensitivity test of less than 2,26 gr/cc.]

Abstrak :
Batupasir Formasi Jatiluhur merupakan lapisan yang merupakan analogi singkapan yang baik dari salah satu lapangan migas di Cekungan Jawa Barat Utara. Aktivitas tektonik sejak Miosen Tengah telah menyebabkan lapisan ini pecah, terlipat, dan terpapar ke permukaan, yang menyebabkan lapisan ini mengalami proses diagenesis secara bertahap. Penelitian ini dilakukan untuk mengetahui tahapan dan proses diagenesis yang terjadi serta pengaruhnya terhadap porositas batuan. Data dalam penelitian ini berasal dari pengukuran potongan stratigrafi yang kemudian dimasukkan ke dalam laboratorium petrografi dan SEM. Hasil analisis petrografi menunjukkan bahwa batupasir Formasi Jatiluhur telah mengalami proses diagenesis berupa pemadatan, pelarutan, dan sementasi. Pemadatan meliputi penataan kembali butiran sedimen dan rekahan dalam sampel batuan. Sementasi terlihat pada analisis SEM yang menunjukkan bahwa semen pada batupasir adalah kalsit, ilit, smektit, dan pirit mineral autigenik. Pelarutan sampel batuan membentuk porositas sekunder, sehingga meningkatkan bilangan porositas. Porositas berkisar antara 1-20%. Variasi nilai porositas ini disebabkan oleh proses sementasi dan pelarutan yang intensif. Dari hasil integrasi analisis petrografi dan SEM, disimpulkan bahwa batupasir Formasi Jatiluhur telah mengalami regim mesogenesis diagenesis. ......The Jatiluhur Formation Sandstone is a layer which is an analogy of a good outcrop from one of the oil and gas fields in the North West Java Basin. Tectonic activity since the Middle Miocene has caused this layer to break, fold, and be exposed to the surface, which causes this layer to undergo a gradual diagenetic process. This research was conducted to determine the stages and processes of diagenesis that occur and their effect on rock porosity. The data in this study came from measurements of stratigraphic pieces which were then entered into the petrographic laboratory and SEM. The results of petrographic analysis show that the sandstones of the Jatiluhur Formation have undergone diagenetic processes in the form of compaction, dissolving, and cementation. Compaction includes the rearrangement of sediment grains and fractures in rock samples. Sementation can be seen in SEM analysis which shows that the cement in the sandstones is calcite, illite, smectite, and autigenic mineral pyrite. The dissolving of rock samples forms secondary porosity, thereby increasing the porosity number. The porosity ranges from 1-20%. This variation in the porosity value is caused by the intensive cementation and dissolving processes. From the results of the integration of petrographic and SEM analysis, it is concluded that the sandstones of the Jatiluhur Formation have undergone a mesogenesis diagenesis regime.

Abstrak :
Lapangan 'X' adalah salah satu lapangan penghasil minyak di Cekungan Sumatera Tengah. Cekungan Sumatera Tengah merupakan salah satu cekungan sedimen penghasil minyak terbesar di Indonesia. Lapangan 'X' adalah area dengan Formasi Bekasap onlaping ke Tinggian Basement. Fitur onlapping berpotensi untuk perangkap stratigrafi. Penelitian ini bertujuan untuk mengidentifikasi potensi perangkap stratigrafi, distribusi reservoir batu pasir, tipe fasies, dan lingkungan pengendapan. Data yang digunakan dalam penelitian ini adalah data seismik 3D, log sumur, dan data inti batuan. Metode penelitian yang digunakan adalah analisis elektrofasies berdasarkan log sumur, atribut seismik, dan model geologi konseptual. Hasil penelitian menunjukkan bahwa ada potensi perangkap stratigrafi dalam bentuk perangkap intra-formasi dan regional. Jebakan intra-formasi dibentuk oleh perselingan batupasir dan litologi serpih secara vertikal dan perubahan fasies lateral, sedangkan jebakan regional dibentuk oleh lapisan serpih Formasi Telisa dan Formasi Bekasap dengan onlap di Tinggian Basement. Berdasarkan inversi AI, dekomposisi spektral 20 Hz, atribut envelope, dan atribut rms amplitudo  menunjukkan distribusi reservoir batupasir A Formasi Bekasap berarah Timurlaut - Baratdaya pada zona onlapping ke Tinggian Basement. Berdasarkan integrasi analisis data batuan inti, elektrofasies, inversi AI, dekomposisi spektral 20 Hz, dan atribut rms amplitudo lingkungan pengendapan reservoir diinterpretasikan sebagai wave dominated delta yang terdiri dari empat fasies: upper shoreface, lower shoreface, distributary channel, dan offshore. ......The 'X' field is an oil-producing field in the Central Sumatera Basin. Central Sumatera Basin is one of the largest oil-producing sedimentary basin in Indonesia. The field is an area in the form of onlaping Bekasap Formation to the Basement High. The onlapping feature has potential for stratigraphic traps. This study aims to identify the potential stratigraphic traps, the distribution of sandstone reservoirs, facies types and the depositional environments. The data used in the study are 3D seismic data, well log, and core data. The research methods used including the analysis of electrofacies based on well log, seismic attributes, and conceptual geology model. The research shows that there is a stratigraphic trap in the form of intra-formation and regional traps. Intra-formation traps were formed vertically by the intersection of sandstone and shale lithologies and lateral facies changes, whereas the regional traps are formed by the shale layer of Telisa Formation and Bekasap Formation with onlapping on the Basement High. Based on AI inversion, spectral-decomposition 20 Hz, envelope, and rms amplitude attributes show the distribution sandstone reservoir A of Bekasap Formation is Northeast - Southwest on onlaping zone to the Basement High. Based on integrated of core data, electrofacies, AI inversion, spectral-decomposition 20 Hz and rms amplitude attributes, the depositional environment of reservoir is interpretated as wave dominated delta which is of four facies: upper shoreface, lower shoreface, distributary channel, and offshore facies.

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ABSTRAK
Analisa atribut merupakan suatu metode kualitatif yang bertujuan memunculkan fitur-fitur data seismik yang tidak nampak, baik secara geometrical maupun physical. Secara geometrical atribut seismik dapat membantu interpreter dalam mengidentifikasi diskontinuitas dikarenakan adanya struktur sementara physical dapat membantu interpreter dalam mengetahui fisis dari batuan. Dalam penelitian ini digunakan atribut koherensi yang merupakan atribut geometrical untuk melihat persebaran dan kemenerusan patahan secara lateral guna mendapat interpretasi patahan yang lebih baik. Selain itu juga digunakan atribut amplitudo RMS yang berguna untuk memetakan persebaran dari reservoir sand. Dalam penelitian ini peneliti memetakan persebaran suatu lapisan batupasir E yang terletak pada kelompok sihapas, Cekungan Sumatra Tengah, Indonesia serta menginterpretasi struktur-struktur patahan yang ada yang dapat menjadi suatu jebakan hidrokarbon. Dari analisa atribut ditemukan bahwa hasil ekstraksi atribut amplitudo RMS berkorelasi dengan lingkungan pengendapan kelompok sihapas dimana atribut tersebut membentuk suatu pola yang mirip dengan tidal sand bar yang terdapat pada lingkungan pengendapan tide dominated delta yang berkembang pada bagian tenggara dari area penelitiaan.

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ABSTRACT
Attribute analysis is a qualitative method that aims to bring the features of seismic data that is not readily apparent, both geometrical and physical. Geometrical attribute can assist interpreter in identifying discontinuities due to structure and Physical attribute can help in knowing the physical interpretation of rock. This study used an attribute that is an attribute of geometrical coherent to see the distribution and continuity of the fault laterally in order to obtain a better interpretation of the fault. RMS amplitude attribute also used for mapping the distribution of reservoir sand. In this study, researcher mapped the distribution of a sandstone layer that lies in group E sihapas, Central Sumatra Basin, Indonesia and interpret the fault structures that exist which can be a trap for hydrocarbons. From the analysis it was found that the extraction attribute RMS amplitude correlates with sihapas group depositional environment where these attributes form a pattern that is similar to the tidal sand bar located on tide dominated delta depositional environments that thrive in the south eastern part.

Abstrak :
Lapangan A merupakan lapangan offshore yang berada di Laut mid-Norway dan telah memproduksi minyak dan gas bumi cukup lama. Tiga buah sumur digunakan pada penelitian ini dengan kelengkapan data Gamma Ray, NPHI, RHOB, dan log Sonik. Untuk mengidentifikasi reservoir hidrokarbon digunakan metode seismik inversi untuk menghasilkan nilai impedansi akustik dan metode well log berupa gamma ray dan porositas guna menggambarkan penyebaran batu pasir pada reservoir hidrokarbon. Dalam proses inversi dibuat dua buah horison yaitu top dan bottom dengan kontrol tiga buah sumur. ......Field A is an offshore field, located in the mid-Norway Sea and has been producing oil and gas for a while. Three wells were used in this study that have Gamma Ray, NPHI, RHOB, and sonic logs. Seismic inversion method is used to identify the hydrocarbon reservoir then to deliver an acoustic impedance. Well log analysis such as gamma ray, porosity, and density are used to illustrate lithology of hydrocarbon reservoir. Inversion method created two horizons ,the top and bottom, with three wells controls.

Abstrak :
Penelitian dilakukan pada reservoir batupasir di Lapangan "Deju" Formasi Talang Akar, Sub Cekungan Ciputat, Jawa Barat Utara. Struktur geologi yang berkembang di daerah penelitian adalah setengah graben dengan fasies pengendapan yang berkembang dari endapan fluvio-delta hingga endapan laut dangkal di puncak formasi Talang Akar. Karakterisasi waduk di lapangan sangat penting terutama dalam menentukan zona prospek waduk yang akan dikembangkan. Oleh karena itu, identifikasi sebaran litologi batuan reservoir dilakukan dengan menggunakan metode inversi seismik post stack dan sifat fisik reservoir menggunakan analisis petrofisika dapat memudahkan interpreter dalam mengkarakterisasi suatu reservoir. Metodologi penelitian meliputi pengolahan data seismik dan wireline logging, interpretasi horizon dan sesar, pembuatan peta struktur waktu, inversi seismik, dan analisis parameter petrofisika. Dengan metode inversi impedansi akustik seismik didapatkan bahwa trend sebaran reservoir batupasir hanya terkonsentrasi disekitar cekungan dengan range nilai impedansi akustik berkisar antara (8600 - 11000) (m / s) * (g / cc). Dalam perhitungan petrofisika diketahui bahwa sumur LL1 dan LL3 memiliki prospek hidrokarbon yang relatif baik, sedangkan sumur LL4 merupakan sumur prospek non hidrokarbon (dry hole). ...... The research was conducted at a sandstone reservoir in the "Deju" Field of the Talang Akar Formation, Ciputat Sub Basin, North West Java. The geological structure that develops in the study area is a half graben with depositional facies that develops from fluvio-deltaic deposits to shallow marine deposits at the top of the Talang Akar formation. Reservoir characterization in the field is very important, especially in determining the zone of the reservoir prospect to be developed. Therefore, identification of reservoir rock lithology distribution is carried out using post stack seismic inversion method and reservoir physical properties using petrophysical analysis can facilitate interpreters in characterizing a reservoir. The research methodology includes seismic data processing and wireline logging, interpretation of horizons and faults, creation of time structure maps, seismic inversion, and analysis of petrophysical parameters. With the seismic acoustic impedance inversion method, it is found that the distribution trend of the sandstone reservoir is only concentrated around the basin with a range of acoustic impedance values ​​ranging from (8600 - 11000) (m / s) * (g / cc). In petrophysical calculations, it is known that LL1 and LL3 wells have relatively good hydrocarbon prospects, while LL4 wells are non-hydrocarbon prospects (dry hole).

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ABSTRAK
Cekungan Kutai terletak di Kalimantan Timur di mana formasi yang telah terbukti menjadi reservoir minyak adalah Formasi Balikpapan. Formasi Balikpapan adalah diendapkan di lingkungan delta. Tujuan dari penelitian ini adalah untuk mengelompokkan batu pasir reservoir Formasi Balikpapan berdasarkan karakter geologi mikroskopis untuk memperkirakan kualitas reservoir berdasarkan porositas, interkoneksi pori-pori, dan diagenesis proses menggunakan petrografi bagian tipis, difraksi sinar-X (XRD), dan pemindaian metode mikroskop elektron (SEM). Hasil penelitian menunjukkan bahwa Formasi Balikpapan adalah didominasi oleh batupasir sublitharenite. Proses diagenesis batupasir termasuk pemadatan, sementasi, penggantian, dan pembubaran. Dari total 15 sampel yang memiliki 4 zona kedalaman berbeda, batupasir dapat dikelompokkan menjadi 3 batuan reservoir kelompok.

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ABSTRACT
The Kutai Basin is located in East Kalimantan where the formation that has proven to be an oil reservoir is the Balikpapan Formation. Balikpapan Formation is deposited in a delta environment. The purpose of this study is to classify the Balikpapan Formation reservoir sandstone based on microscopic geological character for estimate reservoir quality based on porosity, pore interconnection, and process diagenesis using thin section petrography, X-ray diffraction (XRD), and scanning electron microscopy (SEM) methods. The results showed that the Balikpapan Formation was dominated by sublitharenite sandstones. The processes of sandstone diagenesis include compaction, cementation, replacement, and dissolution. From a total of 15 samples which has 4 different depth zones, sandstones can be grouped into 3 reservoir rocks group.

Abstrak :
Studi ini dilakukan untuk memetakan penyebaran zona reservoar batupasir Formasi Menggala Lapangan X4 Cekungan Sumatera Tengah dengan menggunakan metode inversi Lambda Mu Rho (LMR). Parameter Lambda-Rho dapat mengindentifikasikan kandungan suatu fluida di dalam batuan sedangkan parameter Mu-Rho dapat mengidentifikasikan jenis batuan. Dalam studi ini, parameter Lambda Mu Rho menunjukkan bahwa litologi dan hidrokarbon pada Formasi Menggala dapat terpisahkan dengan baik. Daerah Gas-sand terlihat dari nilai Lambda-Rho dan Mu-Rho yang relatif rendah, yaitu Lambda-Rho kurang dari 20 GPa/g*cc dan Mu-Rho antara 20 GPa/g*cc - 30 GPa/g*cc. Analisis dari inversi Lambda Mu Rho, data sumur, dan data geologi terlihat bahwa zona reservoar terkonsentrasi dari bagian barat laut ke tenggara. ......This study is carried out to map the distribution of sandstone reservoir zone Menggala Formation in X4 field Central Sumatra Basin by using Lambda Mu Rho (LMR) inversion. Lambda-Rho parameter indicates the presence of fluid while Mu-Rho parameter indicates the rock type. In this study, Lambda Mu Rho parameter shows that the lithology and hydrocarbon on Menggala Formation can be well separated. Gas-sand zone can be seen at quite low range of Lambda-Rho and Mu-Rho which are Lambda-Rho less than 20 GPa/g*cc and Mu-Rho between 20 GPa/g*cc - 30 GPa/g*cc. Analysis from Lambda Mu Rho inversion, well data, and geological data show that the reservoir distribution zone are concentrate from north-west to south-east.

Abstrak :
Tanjung Layar adalah sebuah situs geologi di Bayah Dome Geopark. Situs ini menyingkap Formasi Cimapag yang terdiri dari batupasir, batulempung, tuf, dan breksi. Penelitian ini bertujuan untuk mengidentifikasi batuan asal dan kondisi geologi regional yang membentuk situs ini untuk memperluas sejarah geologi Kubah Bayah, meningkatkan nilai asesmen geowisata Situs Tanjung Layar, dan mengembangkan ekonomi masyarakat setempat. Metode yang digunakan adalah pembuatan log stratigrafi, pengukuran indikator paleocurrent, dan analisis petrografi untuk menjelaskan tatanan tektonik, indeks pelapukan, dan paleogeografi batuan asal. Hasil penelitian menunjukkan adanya tiga asosiasi fasies batuan di Situs Tanjung Layar, yakni Asosiasi Fasies Laut Dangkal Dominasi Badai (ASF 1), Asosiasi Fasies Turbidit Channel (ASF 2), dan Asosiasi Fasies Turbidit Levee (ASF 3). Plot hasil analisis petrografi pada diagram Dickinson & Suczek (1979) dan Weltje et al. (1998) menunjukkan batuan asal memiliki tatanan tektonik recycled orogen dan magmatic arc, memiliki relief sedang hingga tinggi, dan beriklim sublembap hingga semikering. Arah paleocurrent menunjukkan arus berorientasi barat daya – timur laut. Perbandingan dengan paleogeografi Sundaland pada umur Miosen Awal (Hall, 2013) menunjukkan batuan asal berkaitan dengan kepulauan vulkanik di sisi timur laut wilayah penelitian yang terbentuk akibat subduksi Kerak Samudera Hindia terhadap Kerak Benua Eurasia. ......Tanjung Layar is a geological site in Bayah Dome Geopark. The site is an outcrop of the Cimapag Formation which consists of sandstone, mudstone, tuff, and breccia. This research aims to identify the provenance and regional geology that forms this site to expand the geological history of the Bayah Dome, increase geotourism assessment value of Tanjung Layar, and help the development the locals’ economy. The methods used were measured stratigraphic log, paleocurrent indicator measurement, and petrographic analysis to explain the tectonic setting, weathering index, and paleogeography of the provenance. The results show three different facies associations at Tanjung Layar, namely Storm Dominated Shallow Marine Facies Association (ASF 1), Turbidite Channel Facies Association (ASF 2) and Turbidite Levee Facies Association (ASF 3). Petrographic analysis results plotted over the Dickinson & Suczek (1979) and Weltje et al. (1998) diagrams show the provenance has recycled orogen and magmatic arc tectonic settings, have moderate to high relief, and subhumid to semiarid climate. The paleocurrent has southwest – northeast orientation. Comparison with Early Miocene paleogeography of Sundaland (Hall, 2013) shows the provenance are related to volcanic islands northeast of the research area, which is formed by subduction of Indian Ocean Crust against Eurasian Continental Crust.

Abstrak :
Lapangan TA adalah salah satu lapangan yang beroperasi di bawah PT. Chevron Pacific Indonesia yang telah ditindaklanjuti dengan teknologi baru dalam upaya peningkatan produksi. Berdasarkan data log, Formasi Menggala merupakan perselingan batupasir dan batulempung. Dari penampang seismik diinterpretasikan bahwa terdapat struktur geologi berupa sesar mendatar dan sesar naik. Data Log dan Seismik 3D dapat diolah untuk mendapatkan model bawah permukaan yang lebih baik. Tahapan pengolahan data dimulai dengan korelasi sumur, lalu dilakukan well-seismic tie untuk meletakkan horizon seismik (skala waktu) pada posisi kedalaman sebenarnya yang akan digunakan pada proses picking horizon. Setelah itu dilakukan analisa seismik atribut amplitudo rms, amplitudo palung maksimum, dan atribut kuat refleksi. Dari hasil pengolahan data, diduga terdapat tiga area potensi pengembangan (lead) pada Lapangan TA. Dari ketiganya, lead 1 diduga sebagai daerah yang paling berpotensi berdasarkan peta struktur waktu terdapat closure, peta ketebalan formasi, dan peta atribut dimana zona interest berada di antara 10-20 ms. Pada daerah ini batuan induknya merupakan Kelompok Pematang yaitu Formasi Brown Shale dan tipe kerogen 1 atau 2, reservoar berada pada Formasi Menggala, jebakan berupa struktur lipatan, migrasi primer, dengan batuan tudung Formasi Bangko.

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TA field is one of PT. Chevron Pacific Indonesia?s operating areas that has been obtained new technologies due to increase production. Based on Log Data, Menggala Formation was formed by combination of sandstone and shale. Interpretation from seismic section, there is a geological structures such as normal fault and reverse. Well Log Data and 3D Seismic Data can be processed to get more accurate subsurface model. Stage of processing data started with log correlation and then well-seismic tie for interpreted seismic horizon on time domain that will be used for picking horizon. After that running rms amplitude seismic attribute, maximum trough attribute, and reflection strength attribute. From the results of data processing, supposedly there are three potential areas of development in the TA field. Of the three, lead one suspected as the most potential area (lead) are based on the structure of time there is closure, formation thickness maps, and attributes maps in which the interest zone between 10-20 ms. In this area, the source rock is a group of Pematang is Brown Shale Formation and type of kerogen is 1 or 2, reservoir on this field is Menggala Formation, trapped in a fold structure, primary migration, with Bangko Formation as the seal.