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"ABSTRAKTelah dilakukan penelitian delineasi subcekungan sedimen di cekungan Sengkang yang terletak di lengan bagian selatan Sulawesi. Delineasi subcekungan ini menggunakan kombinasi metode gaya berat dan magnetik, dimana cakupan data magnetik terbatas hanya didaerah Sengkang, sedangkan gaya berat tersebar diseluruh lengan bagian selatan Sulawesi. Berdasarkan analisis horizontal derivative dan second vertical derivative terhadap data gaya berat dan magnetik, subcekungan yang terbentuk dikontrol oleh patahan-patahan di lengan bagian selatan Sulawesi, terutama oleh patahan Walanae. Hasil analisis spektrum menunjukkan kedalaman rata-rata residual adalah 2 km dan kedalaman rata-rata regional sebesar 5,8 km. Hasil dari analisis horizontal derivative dan second vertical derivative yang di overlay dengan citra anomali residual dari gaya berat, dimana batuan dengan densitas tinggi seperti batuan ultrabasa, metamorf dan volkanik menjadi batas masing-masing subcekungan, sehingga terbentuk 8 subcekungan yaitu subcekungan A, subcekungan B, subcekungan C, subcekungan D, subcekungan E dan subcekungan F, subcekungan G dan subcekungan H. Batuan penyusun subcekungan ini diisi oleh batuan sedimen dari formasi Walanae yang dicirikan dengan densitas rendah dan anomali gaya berat yang rendah pula.

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ABSTRACTThe delineation of sub basin has conducted at Sengkang basin that located in the southern part of Sulawesi arm. The delineation of sub basin using a combination of gravity and magnetic methods, where the magnetic data is limited, coverage only Sengkang area, while gravity station are scattered throughout the southern part of Sulawesi arm. Based on analysis of horizontal derivative and second vertical derivative of the magnetic and gravity data, sub basins formerd controlled by faults in the southern arm of Sulawesi, mainly by Walanae fault. The results of the spectrum analysis shows the average depth of residual is 2 km and the depth of the regional is 5.8 km. The results analysis of the horizontal derivatives and the second vertical derivative that are overlaid with the anomalies residual of gravity, where rocks with high density like ultramafics, metamorphic and volcanic be the edge for each sub basin, and there are 8 sub basin namely by sub basin A, sub basin B, sub basin C, sub basin D, sub basin E, sub basin F, sub basin G and sub basin H. Sub basin are filled by sedimentary rocks from Walanae formation that characterized by low density and low gravity anomaly."

"Ketersediaan yang rendah dan permintaan yang tinggi akan energi minyak dan gas bumi di Indonesia menyebabkan perlu diadakannya eksplorasi terhadap potensi cadangan terbaru. Berdasarkan website ESDM, masih terdapat cukup banyak cekungan sedimen di Indonesia yang belum dieksplorasi dengan baik. Cekungan Ketungau merupakan salah satu cekungan yang belum dieksplorasi dan memiliki potensi cadangan hidrokarbon. Penelitian ini bertujuan untuk mengidentifikasi sub-basin menggunakan metode gaya gravitasi pada cekungan Ketungau. Sub-basin yang teridentifikasi diharapkan memiliki potensi sebagai cadangan hidrokarbon. Penelitian ini mengidentifikasi area 7 sebagai sub-basin berdasarkan analisis gravitasi dan pertimbangan aspek geologi. Area 7 memiliki nilai anomali residual yang rendah; nilai FHD yang tinggi; dan ditentukan sebagai patahan berjenis patahan naik. Berdasarkan data tersebut area 7 yang memiliki luasan sebesar 401,92 km2 diyakini sebagai sub-basin yang akan berfungsi sebagai wadah dalam petroleum system. Penentuan komponen lain dalam petroleum system bisa dilakukan dengan metode geofisika lainnya. Penelitian ini diharapkan dapat dijadikan acuan dalam penelitian selanjutnya.

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Lack of supply and high demand for oil and gas energy in Indonesia have led to the need for exploration of new potential reserves. Based on the ESDM site, there are still quite a lot of sedimentary basins in Indonesia that have not been explored properly. The Ketungau Basin is one of the basins that has not been explored and has potential reserves of doubt. This research aims to identify sub-basins using the gravity method in the Ketungau basin. The expected sub-basin has potential as a potential hazard. This study identified area 7 as a sub-basin based on gravity analysis and consideration of geological aspects. Area 7 has a low residual anomaly value; high FHD value; and is defined as a thrust fault. Based on these data, area 7 which has an area of ​​401.92 km² is believed to be a sub-basin that will function as a reservoir in the petroleum system. Other components in the petroleum system can be carried out by other geophysical methods. It is hoped that this research can be used as a reference in next studies."

"Salah satu upaya yang dapat dilakukan untuk memenuhi kebutuhan energi, khususnya gas dan minyak bumi adalah dengan giat untuk melakukan eksplorasi hidrokarbon. Cekungan Sengkang merupakan salah satu cekungan yang terletak di Sulawesi Selatan yang memiliki potensi cadangan hidrokarbon yang cukup besar yaitu berupa gas bumi. Menurut Pertamina (1995) terdapat cadangan gas bumi yang terkandung di Cekungan Sengkang dengan total mencapai 750 Billion Standart Cubic Feet (BSCF). Pengkarakterisasian reservoir sangat penting untuk dilakukan dalam eksplorasi hidrokarbon karena dapat mengetahui karakteristik sifat fisika maupun batuan dari suatu reservoir itu sendiri. Salah satu metode yang sangat membantu dalam menganalisis reservoir adalah inversi seismik impedansi akustik (AI). Pada penelitian ini menggunakan 6 buah sumur yaitu S1, S2, S4, S5, S6, dan S7 serta 15 data lintasan seismik 2D Post Stack Time Migration (PSTM) yang kemudian dilakukan inversi impedansi akustik model based. Berdasarkan hasil yang diperoleh dari peta distribusi memperlihatkan persebaran reservoar karbonat berupa batu gamping yang porous pada zona penelitian yang mempunyai nilai impedansi akustik yang rendah yaitu berkisar antara 22.000 - 27.000 ((ft/s)*(g/cc)) dan mempunyai nilai persebaran porositas 26% - 28%.

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One of the ways that can be done to meet energy needs, especially gas and oil, is to actively explore hydrocarbons. The Sengkang Basin is one of the basins located in South Sulawesi which has a large potential for hydrocarbon reserves in the form of natural gas. According to Pertamina (1995) there are natural gas reserves contained in the Sengkang Basin with a total of 750 Billion Standard Cubic Feet (BSCF). Reservoir characterization is very important in hydrocarbon exploration because it can determine the physical and rock characteristics of a reservoir itself. One method that is very helpful in analyzing reservoirs is acoustic impedance seismic inversion (AI). In this study, 6 wells were used, namely S1, S2, S4, S5, S6, and S7 as well as 15 2D Post Stack Time Migration (PSTM) seismic trajectories which were then performed with model-based acoustic impedance inversion. Based on the results obtained from the distribution map, it shows that the distribution of carbonate reservoirs in the form of porous limestone in the study zone has a low impedance value ranging from 22.000 - 27.000 ((ft/s)*(g/cc)) and has a porosity distribution value of 25% - 28%."

"Pengolahan dan analisa data gravitasi pada cekungan Sumatra Tengah diperlukan guna mengidentifikasi dan mendeliniasi keberadaan sub-cekungan yang berpotensi sebagai peng-supply hidrokarbon dan mengetahui struktur geologi bawah permukaan dengan pemodelan 2D. Analisa spektrum, analisis derivatif, serta pemodelan forward 2D dilakukan dalam pengolahan data dan disesuaikan dengan data pendukung untuk mengetahui keberadaan sub-cekungan dan struktur bawah permukaan area penelitian. Berdasarkan penerapan metode tersebut didapatkan nilai anomali bouguer berkisar dari -24.924 mGal hingga 20.119 mGal, dengan anomali tinggi pada bagian barat laut-selatan yang berhubungan dengan basemen yang terangkat di area tersebut dan anomali rendah tersebar pada arah barat daya, barat laut, timur laut, dan tenggara berhubungan dengan zona sesar. Hasil analisa spektrum menunjukkan kedalaman basemen berada pada kedalaman 3.2-7.05 kilometer, kedalaman rata-rata anomali residual berkisar 0.5-3 km. Hasil analisa derivatif yang terkonfirmasi oleh data geologi terdapat struktur sesar naik berupa sub-thrust yang berasosiasi dengan high anomali dan juga terdapat sesar normal yang berhubungan dengan low anomali. Hasil model forward 2D menggambarkan struktur lapisan penyusun berumur tua sampai muda mulai dari basemen, kelompok pematang, kelompok sihapas, formasi telisa, formasi petani, formasi minas, dan endapan alluvial. Sub-cekungan teridentifikasi memiliki estimasi kedalaman antara 3.2-3.8 km dengan batas sub-cekungan terletak pada indikasi sesar daerah penelitian.

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Processing and analysis of gravity data in Central Sumatra Basin are needed to identify and delineate the existence of sub-basins that have the potential to supply hydrocarbons and determine the subsurface geological structure with 2D modeling. Spektrum analysis, FHD analysis, and 2D forward modeling are carried out in data processing and adjusted with supporting data to determine the existence of sub-basins and subsurface structures in the study area. Based on the application of this method, the result shows that Bouguer anomaly values ranged from -24.924 mGal to 20.119 mGal with high anomalies in the northwest-south associated with raised basement in the area and low anomaly spread in the southwest, northwest, northeast, and southeast associated with fault zones. The spectrum analysis result shows that the depth of the basement is at a depth of 3.2-7.05 km, and the average depth of the residual anomaly is around 0.5-3 km. The result of the derivative analysis which are confirmed by the geological data show that there is an reverse fault structure in the form of a sub-thrust which is associated with high anomalies and there are also normal faults which are associated with low anomaly. The result of the 2D forward model describe the layer structure from the eldest to youngest that were Basement, Pematang groups, Sihapas groups, Telisa formations, Petani formations, Minas formations, and alluvial deposits. The identified sub-basin has an estimated depth of between 3.2-3.8 km with the boundary of the sub-basin located at the fault indication in the study area.  "

"[Lapangan FTM sebagai lapangan minyak dan gas bumi. Pada lapangan FTMterdapat dua reservoir gas dan reservoir minyak, yaitu formasi Minahaki danFormasi Tomori. Penelitian yang dilakukan pada formasi Tomori dengan litologibatuan karbonat dan merupakan reservoir minyak yang berumur Miocene Akhir.Stuktur ini terbentuk oleh sesar mendatar (Trust fault) dengan sudut kecil yangberarah NE-SW.Identifikasi hidrokarbon pada studi ini didasarkan pada hasil metode dekomposisispektral. Metode dekomposisi spektral berbasis ISA dan CWT digunakan untukanalisa anomali frekuensi rendah. Anomali frekuensi rendah berasosiasi adanyahidrokarbon. Analisa petrofisika pada lapangan FTM pada daerah hidrokarbonmempunyai porositas yang bagus dan saturasi air yang kecil.Hasil dari pemetaan zona prospek hidrokarbon dan analisa petrofisika inidiharapkan bisa dilakukan delineasi zona prospek untuk kepentingan surveyseismik lebih lanjut dan acuan untuk proses pemboran.;FTM Field is one of the new fields as energy reserves in Indonesia as an oil andgas field. In the field there are two reservoirs FTM gas and oil reservoirs, namelythe formation Minahaki and Tomori Formation. Research conducted on theformation lithology Tomori with carbonate rocks and an oil reservoir LateMiocene. This structure is formed by a horizontal fault (Trust fault) with a smallangle of the NE - SW trending.Hydrocarbon determination using spectral decomposition method, based spectraldecomposition method is used for analysis ISA and CWT low frequency anomaly.Low frequency anomaly associated hydrocarbon indicator. Petrophysical analysisFTM field have good porosity and water saturation small on hydrocarbon area.Results of mapping zones of hydrocarbon prospects and petro physical analysis isexpected to be used for the benefit of the prospect delineation zone further seismicsurveys and drilling of reference for the process.;FTM Field is one of the new fields as energy reserves in Indonesia as an oil andgas field. In the field there are two reservoirs FTM gas and oil reservoirs, namelythe formation Minahaki and Tomori Formation. Research conducted on theformation lithology Tomori with carbonate rocks and an oil reservoir LateMiocene. This structure is formed by a horizontal fault (Trust fault) with a smallangle of the NE - SW trending.Hydrocarbon determination using spectral decomposition method, based spectraldecomposition method is used for analysis ISA and CWT low frequency anomaly.Low frequency anomaly associated hydrocarbon indicator. Petrophysical analysisFTM field have good porosity and water saturation small on hydrocarbon area.Results of mapping zones of hydrocarbon prospects and petro physical analysis isexpected to be used for the benefit of the prospect delineation zone further seismicsurveys and drilling of reference for the process.;FTM Field is one of the new fields as energy reserves in Indonesia as an oil andgas field. In the field there are two reservoirs FTM gas and oil reservoirs, namelythe formation Minahaki and Tomori Formation. Research conducted on theformation lithology Tomori with carbonate rocks and an oil reservoir LateMiocene. This structure is formed by a horizontal fault (Trust fault) with a smallangle of the NE - SW trending.Hydrocarbon determination using spectral decomposition method, based spectraldecomposition method is used for analysis ISA and CWT low frequency anomaly.Low frequency anomaly associated hydrocarbon indicator. Petrophysical analysisFTM field have good porosity and water saturation small on hydrocarbon area.Results of mapping zones of hydrocarbon prospects and petro physical analysis isexpected to be used for the benefit of the prospect delineation zone further seismicsurveys and drilling of reference for the process.;FTM Field is one of the new fields as energy reserves in Indonesia as an oil andgas field. In the field there are two reservoirs FTM gas and oil reservoirs, namelythe formation Minahaki and Tomori Formation. Research conducted on theformation lithology Tomori with carbonate rocks and an oil reservoir LateMiocene. This structure is formed by a horizontal fault (Trust fault) with a smallangle of the NE - SW trending.Hydrocarbon determination using spectral decomposition method, based spectraldecomposition method is used for analysis ISA and CWT low frequency anomaly.Low frequency anomaly associated hydrocarbon indicator. Petrophysical analysisFTM field have good porosity and water saturation small on hydrocarbon area.Results of mapping zones of hydrocarbon prospects and petro physical analysis isexpected to be used for the benefit of the prospect delineation zone further seismicsurveys and drilling of reference for the process.;FTM Field is one of the new fields as energy reserves in Indonesia as an oil andgas field. In the field there are two reservoirs FTM gas and oil reservoirs, namelythe formation Minahaki and Tomori Formation. Research conducted on theformation lithology Tomori with carbonate rocks and an oil reservoir LateMiocene. This structure is formed by a horizontal fault (Trust fault) with a smallangle of the NE - SW trending.Hydrocarbon determination using spectral decomposition method, based spectraldecomposition method is used for analysis ISA and CWT low frequency anomaly.Low frequency anomaly associated hydrocarbon indicator. Petrophysical analysisFTM field have good porosity and water saturation small on hydrocarbon area.Results of mapping zones of hydrocarbon prospects and petro physical analysis isexpected to be used for the benefit of the prospect delineation zone further seismicsurveys and drilling of reference for the process., FTM Field is one of the new fields as energy reserves in Indonesia as an oil andgas field. In the field there are two reservoirs FTM gas and oil reservoirs, namelythe formation Minahaki and Tomori Formation. Research conducted on theformation lithology Tomori with carbonate rocks and an oil reservoir LateMiocene. This structure is formed by a horizontal fault (Trust fault) with a smallangle of the NE - SW trending.Hydrocarbon determination using spectral decomposition method, based spectraldecomposition method is used for analysis ISA and CWT low frequency anomaly.Low frequency anomaly associated hydrocarbon indicator. Petrophysical analysisFTM field have good porosity and water saturation small on hydrocarbon area.Results of mapping zones of hydrocarbon prospects and petro physical analysis isexpected to be used for the benefit of the prospect delineation zone further seismicsurveys and drilling of reference for the process.]"

"ABSTRAKKeberadaan sistem perminyakan di kabupaten majalengka dapat di identifikasi oleh keberadaan rembesan minyak. Berdasarkan dari penelitian LIPI 2016 menggunakan data gravitasi memperlihatkan keberadaan sub cekungan di majalengka. Keberadaan struktur sub cekungan menjadi indikasi yang utama tentang keberadaan hidrokarbon. Potensial terbentuk nya hidrokarbon berdasarkan dari penelitian praptisih dan kamtono 2016 berada di Formasi Cinambo yang berisi batuan sedimen. Namun keberadaan batuan sedimen tersebut tertutupi oleh batuan vulkanik yang di produksi oleh gunung Ciremai. Berdasarkan dari section Audio Magnetotellurik pada penelitian sebelumnya memperlihatkan struktur patahan yang diperkirakan sebagai jebakan hidrokarbon. Untuk mengidentifikasi struktur patahan dan keberadaan potensi struktur sub cekungan maka dilakukan pengambilan data gravitasi. Pengabilan data dilakukan dengan luas area 22 x 17 km2 dengan 170 titik pengukuran dan interval titik sejauh 1 km. Identifikasi keberadaan patahan akan dilakukan dengan menganalisis peta reidual dan penentuanjenis patahan digunakan metode Second Vertical Derivatif SVD . Hasil akhir dari penelitian ini adalah perkiraan model bawah permukaan dengan hail interpretasi terpadu data gaya berat dengan data data pendukung lain nya.hr>ABSTRAKThe existence of petroleum systems in the area of Majalengka can be identified by the presence of several oil seeps. Based on reasearch by LIPI 2016 using gravity method shown the presence of hydrocarbon sub basin in Majalengka. The presence of sub basin in the study area can be a major indication of the presence of hydrocarbon. Hydrocarbon potential according to the research by Praptisih and Kamtono 2016 are in the Cinambo Formation that consist of sedimentary rocks. Unfortunately, the sedimentary rocks are covered by volcanic rocks as a product of Mt. Ciremai. According to resistivity cross section acquired by Audio Magnetotelluric survey by Alfiansyah 2016 show that the faults structure exist which estimated as a hydrocarbon trap. To identify the fault structure and sub basin area we used gravity method. The gravity data acquisition performed in the area of 22 x 17 km2 with more than 170 stations. Identification of the presence of the fault and the type of fault structures can be done by performing the analysis of the gravity data. To identify the fault we analylsed the residual map and and to view the vertical contact between the body below the surface and produce the anomaly contour map Second Vertical Derivative SVD is used. Then the estimated subsurface structure models are made with the integrated interpretation of geological data available. The results of the study showed the structures that control the formation of traps for hydrocarbons accumulation is in the form of normal fault and showed that the study area is covered by the hydrocarbon sub basin."

"Telah dilakukan analisis metode dekomposisi spektral berbasis transformasi wavelet kontinyu (CWT) terintegrasi atribut seismik Amplitudo RMS dan Similarity dalam mendelineasikan zona patahan-rekahan didukung dengan analisis data sumur dan log FMI (FullboreFormation Micro Imager) dalam menentukan arah patahan-rekahan. Daerah penelitian ini berada pada Lapangan "Falah", Cekungan Jawa Timur dengan formasi Tuban berumur Miosen. Objek penelitian dikategorikan batuan karbonat jenis reef built up dan zona menarik untuk dianalisis pada reservoar karbonat yaitu berupa zona patahan dan rekahan. Hasilnya metode dekomposisi spekral berbasis CWT dapat memperlihatkan patahan-rekahan pada frekuensi tinggi 40 Hz dan terintegrasi Atribut seismik Amplitudo RMS pada lebar jendela 10 ms dan Similarity pada 25 ms. Patahan-rekahan memiliki arah umum kemiringan sebesar 700 berarah timurlaut-baratdaya. Ketiga atribut yang digunakan pada penelitian ini dapat mendelineasikan arah patahan dan rekahan pada reservoar karbonat reef built up.

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There have been done analysis of spectral decomposition method which was based on Continuous Wavelet Transformation (CWT), integrated Seismic Attributes of RMS amplitude and Similarity. To delineate fault-fracture zone is supported with well data analysis and FMI (FullboreFormation Micro Imager) log is used to define fault-fracture direction. This project research is located at “Falah” field. East Java basin with Tuban formation is in Miocene era. Research object is categorized carbonate rock with reef built up type and the zone is interesting to analyze of carbonate reservoir which are fault and fracture zone.

Result of spectral decomposition method which was based on CWT can show fault-fracture in high frequency at 40Hz and integrated seismic attribute of RMS amplitude with window width at 10ms and then similarity at 25ms. Fault-fracture has common dip at 70° of North East – South West direction. Three attributes were used in this research can delineate fault and fracture direction of carbonate reservoir with reef built up type."

"Reservoar batuan dasar terekah merupakan reservoar batuan beku dan batuan metamorf yang terekahkan secara alami, sehingga memiliki porositas dan permeabilitas sekunder yang dapat menjadi tempat terkonsentrasinya hidrokarbon. Indonesia merupakan salah satu negara yang memiliki potensi reservoar batuan dasar terekah, salah satunya berada pada Cekungan Sumatera Selatan. Pencarian rekahan pada reservoar batuan dasar terekah dinilai cukup rumit. Untuk itu, dibutuhkan metode yang tepat dalam memprediksi sebaran rekahan pada batuan dasar. Salah satu metode yang efektif dalam memetakan dan memodelkan sebaran rekahan pada batuan dasar terekah yaitu metode Continuous Fracture Modeling (CFM). Metode ini memanfaatkan integrasi antara data seismik dengan data sumur melalui pendekatan neural network, sehingga dinilai mampu mengakomodir kelemahan data seismik yang memiliki resolusi terbatas. Data dip angle dan dip azimuth dari data log FMI digunakan untuk analisis rekahan disekitar sumur yang selanjutnya disebarkan secara lateral dalam model grid 3D untuk memprediksi keberadaan rekahan pada daerah yang tidak memiliki data sumur. Fracture driver terpilih (maximum curvature, ant-track, variance, chaos, dip illumination, dan 3D edge enhancement) digunakan dalam proses training dengan fracture indicator untuk menghasilkan model intensitas rekahan. Pemilihan fracture driver didasarkan oleh nilai korelasi, dimana korelasi terbesar terdapat pada atribut passive ant-track sebesar 0.316 dengan fracture indicator. Selanjutnya, model di validasi dengan data Drill Stem Test (DST). Berdasarkan hasil data DST dan model intensitas rekahan menunjukkan bahwa, daerah dengan intensitas rekahan tinggi memiliki korelasi dengan keberadaan fluida berupa gas pada data DST.

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Fractured basement reservoir is a reservoir of igneous rocks and metamorphic rocks that are naturally fractured, which has good secondary porosity and permeability which can act as a reservoir for hydrocarbon concentration. Indonesia is one country with a potential of fractured basement reservoir, one of which located in the South Sumatra Basin. Exploring fractured in the basement reservoir is quite tricky, for this reason, a proper method is required to predict the distribution of fractures in the fractured basement. One of the effective methods in mapping and modeling the distribution of fractures in the fractured basement exploration is the Continuous Fracture Modeling (CFM) method. This method utilizes the integration of seismic data and well log data through a neural network approach, which is capable to resolve the weaknesses of the seismic data which has limited resolution. Dip angle and dip azimuth data from log FMI, are used for fracture analysis around wells which later distributed in a 3D grid model to predict the existence of fractures in the area that does not have well log data. The selected fracture drivers (maximum curvature, ant-track, variance, chaos, dip illumination, and 3D edge enhancement) are used for training process with fracture indicator to build the fracture intensity model. The fracture drivers were selected by its correlation value to the fracture indicator, where passive ant-track has the highest value at 0.316. Furthermore, the results of the model are validated with Drill Stem Test (DST) data. Based on the results of DST data and fracture intensity models show that areas with high fracture intensities have a correlation with the existence of gas fluid in the DST data."

"ABSTRAKPenentuan nilai tekanan pori merupakan salah satu tahapan yang perlu dilakukan dalam suatu kegiatan eksplorasi minyak dan gas bumi pada suatu lapangan hidrokarbon. Nilai tekanan pori dapat digunakan untuk mengetahui seberapa aman proses eksplorasi yang berlangsung pada lapangan tersebut dengan mengetahui apakah terdapat kondisi overpressure di bawah permukaan. Dengan mengetahui hal tersebut maka dapat dilakukan pencegahan terhadap masalah pengeboran seperti loss, kick, atau blowout. Untuk itu perlu dilakukan analisis nilai tekanan pori. Pada penelitian ini dilakukan perhitungan tekanan pori dengan menggunakan Metode Eaton dan Metode Kompresibilitas berdasarkan data wireline logging pada Lapangan X Cekungan Sunda. Metode tersebut diterapkan pada litologi yang berbeda, dimana untuk litologi shale digunakan Metode Eaton dan litologi karbonat digunakan Metode Kompresibilitas. Sebelum melakukan perhitungan tekanan pori, dilakukan analisis petrofisika untuk mendapatkan parameter input yang diperlukan serta perhitungan tekanan overburden dan teknanan hidrostatik dengan data log densitas. Pada penelitian ini juga dilakukan perhitungan tekanan rekah menggunakan Metode Eaton yang bertujuan untuk mengetahui apakah mud-weight yang digunakan dalam eksplorasi sudah tepat atau tidak. Nilai tekanan pori yang didapatkan dengan menggunakan Metode Eaton dihitung berdasarkan nilai Normal Compaction Trend (NCT) Sonik sedangkan perhitungan pada metode kompresibilitas dilakukan dengan mencari nilai kompresibilitas bulk dan kompresibilitas pori terlebih dahulu. Metode Kompresibilitas yang digunakan pada penelitian ini ada dua, yaitu metode Kompresibiltias Atashbari dan metode Kompresibilitas Azadpour. Hasil perhitungan tekanan tersebut kemudian dikalibrasikan dengan data pengukuran tekanan langsung (DST) yang tersedia pada tiap sumur penelitian. Berdasarkan hasil perhitungan dapat dilihat bahwa metode Kompresibilitas Azadpour menunjukkan hasil yang lebih baik untuk perhitungan tekanan pori di litologi karbonat. Hasil dari penelitian menunjukkan bahwa secara umum nilai tekanan pori di sumur penelitian berada pada nilai yang cukup aman, dimana secara keseluruhan nilai tekanan pori berada di bawah mud-weight yang digunakan sehingga tidak menimbulkan fenomena kick yang membahayakan kegiatan eksplorasi.

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ABSTRACTPore pressure determination is an important step that is needed to be done on an oil and gas exploration process in a hydrocarbon field. Pore pressure value can be used to determine whether the field is safe enough to do exploration by knowing if there is any overpressure condition below the surface. By knowing pore pressure value, we can do prevention towards drilling problem such as loss, kick, or blowout. For that reason, pore pressure analysis needs to be done. In this research, pore pressure value is calculated using Eatons Method and Compressibility Method based on wireline logging data in Field X Sunda Basin. Both methods are applied for different lithologies, in which for shale rock Eatons Method is used, while Compressibility Method is used for carbonate rock. Before calculating pore pressure, first petrophysics analysis is done to get input parameter that is needed, and then overburden stress and hydrostatic pressure is calculated using density log. In this research fracture pressure is also calculated using Eatons Method to find out whether mud-weight that is used in the exploration step is appropriate. Pore pressure value from Eatons Method is calculated based on Sonic Normal Compaction Trend (NCT) value while the calculation on Compressibility Method is done by finding bulk compressibility and pore compressibility first, there are two different Compressibility methods that is used in this research, that is Atashbari Compressibility method and Azadpour Compressibility method. The result of pore pressure calculation is then calibrated using direct pressure measurements from DST data that is available on the research well. Based on the results of calculation, Azadpour Compressibility method shows a better result in calculating pore pressure in carbonate lithology. The results of the study show that in general pore pressure value in the research well were at a safe value, where in general the pore pressure were below mud-weight value that is used on the well so it did not cause any kick phenomena that is dangerous during exploration activity."

"Air tanah merupakan salah satu sumber daya alam paling penting yang mendukung kesehatan manusia, perkembangan ekonomi, dan keanekaragaman ekologi. Penggunaan air tanah terus meningkat disebabkan oleh faktor-faktor seperti kemudahan mendapatkannya, kualitas yang baik, dan biaya yang murah. Kebutuhan air tanah di Cekungan Air Tanah (CAT) Bogor cukup besar karena tingginya jumlah penduduk dan industri. Mengingat pentingnya peran air tanah maka pengetahuan tentang keberadaan air tanah sangat diperlukan. Penelitian ini bertujuan untuk memperoleh informasi spasial tingkat potensi air tanah berdasarkan analisis fisik berupa geologi, geomorfologi, lereng, tutupan lahan, kerapatan aliran, tekstur tanah, dan curah hujan dengan menggunakan teknik Sistem Informasi Geografi, Penginderaan Jauh, dan Analytic Hierarchy Process (AHP). Hasil penelitian menunjukkan variabel yang memiliki pengaruh paling besar adalah penggunaan lahan. CAT Bogor memiliki potensi air tanah yang baik di bagian utara dan kurang baik di bagian selatan.

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Groundwater is one of the most important resource that support human health, economy development, and diversity of ecology. Groundwater using increase because of many factors, such as : easy in exploitation, good in quality, and low in cost. Requirement of groundwater in Bogor basin is high because of high population and industry. Considering the importance of groundwater, the knowledge about existence of groundwater is needful. The purpose of this research is acquiring the spatial information about level of groundwater potential based physic analysis those are geology, geomorphology, slope, land use, drainage density, soil texture, and annual rainfall using Geography Information System, Remote Sensing, and Analytic Hierarchy Process (AHP). The result of this research shows that landuse is the most influent parameter. Groundwater potential in the southern of Bogor Basin is enough good and in the northern is not enough good."