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"Lokasi penelitian terletak di Desa Cihaur yang terletak di Kecamatan Simpenan, Kabupaten Sukabumi, Provinsi Jawa Barat. Secara Fisiografi Desa Cihaur termasuk bagian dari Zona Pegunungan Selatan Jawa Barat atau Pegunungan Andesit Tua yang disusun oleh Formasi Jampang dan Formasi Dasit Ciemas. Pada area penelitian terdapat endapan skarn dengan batuan induk berupa batugamping. Endapan skarn merupakan endapan yang terbentuk akibat adanya kontak antara batugamping dengan batuan intrusi. Berdasarkan data perusahaan, batuan intrusi tidak ditemukan diatas permukaan. Oleh karena itu diperlukan studi fasies Vulkanik dan keterkaitan dengan batugamping yang berperan sebagai host skarn pada area penelitian untuk mengetahui skarn yang terbentuk pada area penelitian merupakan hasil kontak intrusi dengan batugamping atau akibat faktor lainnya. Metode yang digunakan dalam penelitian ini adalah analisis petrologi dan petrografi batuan inti sebanyak 22 lubang bor, Data-data yang diperoleh selanjutnya divisualisasikan dalam bentuk kolom litologi yang kemudian digunakan untuk menginterpretasikan hubungan antara fasies Vulkanik dengan batugamping yang berperan sebagai host skarn. Berdasarkan analisis petrologi dan petrografi didapati 13 litofasies yang kemudian dikelompokkan kedalam 6 satuan diantaranya Breksi Vulkanik, Lapilli Tuf, Tufaan, Andesit, Batugamping, dan Dasit Porfiri. Berdasarkan asosiasi litologi dan karakteristik litologi yang telah mengalami ubahan hidrotermal (alterasi) maka dapat disimpulkan bahwa daerah penelitian berada pada fasies proksimal gunung api. Keterkaitan antara batugamping dengan fasies vulkanik diinterpretasikan berdasarkan korelasi stratigrafi, didapati jika batugamping yang terubah menjadi marmer ataupun teralterasi skarn disebabkan oleh adanya terobosan oleh satuan dasit porfiri.

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The research location is located in Cihaur Village which is located in Simpenan District, Sukabumi Regency, West Java Province. Physiographically, Cihaur Village is part of the Southern Mountain Zone of West Java or the Old Andesite Mountains which are composed of the Jampang Formation and the Ciemas Dacite Formation. In the research area there are skarn deposits with the source rock being limestone. Skarn deposits are deposits formed due to contact between limestone and intrusive rocks. Based on company data, intrusive rocks were not found above the surface. Therefore, it is necessary to study volcanic facies and their relationship with limestone which acts as a host for skarn in the research area to determine whether the skarn formed in the research area is the result of intrusive contact with limestone or due to other factors. The method used in this research is petrological and petrographic analysis of core rock from 22 drill holes. The data obtained is then visualized in the form of lithological columns which are then used to interpret the relationship between volcanic facies and limestone which acts as a skarn host. Based on petrological and petrographic analysis, 13 lithofacies were found which were then grouped into 6 units including Volcanic Breccia, Lapilli Tuff, Tufaan, Andesite, Limestone and Porphyry Dacite. Based on the lithological associations and lithological characteristics that have undergone hydrothermal change (alteration), it can be concluded that the research area is in the proximal volcanic facies. The relationship between limestone and volcanic facies is interpreted based on stratigraphic correlation, it is found that limestone is changed to marble or skarn alteration due to breakthroughs by porphyry dacite units."

"Penelitian ini akan membahas mengenai pemodelan penyebaran fasies sedimen laut dalam di salah satu lapangan yang mengandung gas di Cekungan Kutai. Fasies pengendapan di lapangan Y dibagi menjadi 5 yakni Channel Axis, Channel Margin, Levee Overbank, Mass Transport dan Mud. Fasies pengendapan tersebut dibedakan satu dengan yang lain dalam penelitian ini melalui perbedaan cut-off vshale dan pola log GR. Korelasi antar sumur menggunakan ketentuan stratigrafi sikuen dibantu dengan data plot gradien tekanan dan data seismik. Interpretasi data seismik 3D pada interval pemodelan yaitu interval A bertujuan untuk membentuk kerangka pemodelan penyebaran fasies. Pemodelan penyebaran fasies pada penelitian kali ini menggunakan metode Multi Point Statistic Simulation (MPS). Modul pemodelan MPS dalam software Petrel menyediakan sarana untuk menyertakan berbagai macam input data geologi dan geofisika dalam pemodelan fasies. Data input tersebut antara lain training image, seismik vshale dan data peta medan azimuth. Penelitian ini juga mencoba membandingkan proses pemodelan fasies menggunakan metode MPS dengan salah satu metode stochastic lainnya yakni SIS (Sequential Indicator Simulation).

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This study describes about fasies distribution modeling of deepwater deposit in one of gas field at Kutai Basin.The deepwater depositional fasies in Y field can be divided into 5 fasies such as Channel Axis, Channel Margin, Levee Overbank, Mass Transport and Mud. Vshale cut-off and GR log pattern are used for dividing one depositional fasies to other depositional facies. Sequence stratigraphy concept is applied on well to well correlation supported with other data like pressure gradien plot and seismic section. 3D seismic horizon interpretation at A interval aim to build model framework for fasies distribution.

This research utilizes Multi Point Statistic Simulation (MPS) method to distribute the fasies. The MPS modeling modul in Petrel provides some options to use geology and geophysics data as modeling input. Thoose input data are training image, vshale seismic cube and azimuth field map. The study also tried to compare the facies modeling process using the MPS method with one of the other stochastic methods namely SIS ( Sequential Indicator Simulation )."

"Formasi Ngimbang memiliki reservoir berupa batuan karbonat. Batuan karbonat memiliki kesulitan yang lebih khususnya pada reservoir hidrokarbon. Untuk mendukung kegiatan hal tersebut dibutuhkan pemahaman kondisi geologi di wilayah Cekungan Jawa Timur, salah satunya adalah studi mengenai fasies dan lingkungan pengendapan. Metode yang digunakan dalam penelitian ini adalah deskripsi batuan inti, deskripsi petrografi, dan interpretasi log sumur. Data yang digunakan berupa 3 sumur dengan 30 sampel sayatan tipis. Dari analisis tersebut, didapatkan 6 fasies, yaitu mudstone, large foram wackestone, skeletal wackestone, large foram packstone, skeletal packstone-grainstone, dan shale dengan 3 asosiasi fasies, yaitu platform interior – open marine, platform-margin sand shoals, dan platform interior – restricted

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The Ngimbang Formation has a reservoir of carbonate rocks. Carbonate rocks have more difficulties, especially in hydrocarbon reservoirs. To support these activities, it is necessary to understand the geological conditions in the East Java Basin area, one of which is the study of facies and depositional environments. The methods used in this study are core rock description, petrographic description, and well log interpretation. The data used were 3 wells with 30 thin section samples. From the analysis, 6 facies were obtained, namely mudstone, large foram wackestone, skeletal wackestone, large foram packstone, skeletal packstone-grainstone, and shale with 3 facies associations, namely platform interior - open marine, platform-margin sand shoals, and platform interior - restricted."

"Daerah penelitian terletak di utara Delta Mahakam Kalimantan Timur dan termasuk ke dalam Cekungan Kutai. Penelitian dilakukan terhadap Interval “J” Lapangan “X” Formasi Pulaubalang Cekungan Kutai yang tersusun atas perselingan batupasir, batulempung, dan batubara. Formasi ini umumnya diendapkan pada lingkungan pengendapan delta dan merupakan salah satu interval penghasil hidrokarbon di Cekungan Kutai.Studi ini dilakukan dengan pendekatan litofasies, elektrofasies, fasies pengendapan, dan petrofisika untuk mengetahui karakteristik reservoir untuk setiap fasies pengendapan. Data yang digunakan diperoleh dari 5 sumur yang meliputi data mudlog, batuan inti, dan log sumur.Dari hasil penelitian, terdapat empat litofasies pada interval “J” yaitu litofasies batupasir blocky, litofasies batulempung, litofasies perselingan batulempung, batupasir dan batubara, serta litofasies batulempung sisipan batupasir dan batubara. Berdasarkan data wireline log, karakteristik elektrofasies terdiri atas cylindrical/blocky, funnel, bell, and serrated. Lingkungan pengendapan batuan Interval “X” berkisar dari daerah distributary channel hingga delta front pada lingkungan transisi delta. Litofasies batupasir blocky diendapkan pada lingkungan distributary channel, litofasies batulempung diendapkan pada lingkungan floodplain, litofasies perselingan batulempung, batupasir dan batubara diendapkan pada lingkungan floodplain-crevasse splay, dan litofasies batulempung sisipan batupasir dan batubara diendapkan pada lingkungan floodplain-crevasse splay.Berdasarkan kombinasi litofasies dan elektrofasies, sebaran fasies pengendapan dapat dikelompokkan menjadi lima fasies pengendapan yaitu Fasies Channel, Crevasse Splay, Delta Front, Point Bar, dan Flood Plain. Dari analisis petrofisika, diketahui Fasies Channel adalah batuan yang paling baik berperan sebagai reservoir dengan volume serpih rata-rata 40.06%, porositas efektif 7,81% dan saturasi air 80,34%, sementara fasies floodplain memiliki rata-rata volume serpih 89,13%, porositas efektif 0,93% dan saturasi air 96,15%, fasies ini lebih cocok berperan sebagai seal rock melihat tingginya nilai volume serpih dan rendahnya nilai porositas efektifnya.

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Study area located at northern Mahakam Delta East Kalimantan and belongs to Kutai Basin. The study conducted for Interval “J,” Field “X” Pulaubalang Formation, Kutai Basin which composed of sandstone, claystone, and coal intercalation. This formation is mostly deposited in deltaic environment and is one of the most prolific hydrocarbon intervals in Kutai Basin.

This study was conducted with lithofacies, electrofacies, depositional facies, and petrophysical approach to find out the reservoir properties for each depositional facies. The data used obtained from 5 wells i.e. mudlog data, core, and well log.

From the results of the study, there are four lithofacies in the “J” interval: blocky sandstone lithofacies, claystone lithofacies, claystone-sandstone-coal intercalation lithofacies, claystone with sandstone-coal stringer lithofacies. Based on wireline log data, electrofacies characteristics consist of cylindrical/blocky, funnel, bell, and serrated. The depositional environment ranges from distributary channel to delta front in deltaic environments. Blocky sandstone lithofacies deposited in distributary channel, claystone lithofacies deposited in floodplain, claystone-sandstone-coal intercalation lithofacies deposited in floodplain-crevasse splay, dan claystone with sandstone-coal stringer lithofacies deposited in floodplain-crevasse splay environment.

Based on combination of lithofacies and electrofacies, depositional facies can be grouped into five depositional facies: Fasies Channel, Crevasse Splay, Delta Front, Point Bar, dan Flood Plain. From petrophysical analysis, channel facies is the best reservoir rock with average volume of shale 40.06%, effective porosity 7,81% and water saturation 80,34%. Floodplain facies have average volume of shale 89,13%, effective porosity 0,93% dan water saturation 96,15%, this facies is more suitable as seal rock with the high shale content dan low effective porosity."

"Analisa seismik atribut telah digunakan untuk data seismik 3D pada cekungan Sumatera Selatan. Analisa ini bertujuan untuk memetakan distribusi dari reservoar karbonat, yang bersasosiasi dengan lingkungan pengendapan. Atribut seismik yang digunakan pada interpretasi reservoar karbonat adalah amplitudo rms, amplitudo maksimum, amplitudo minimum, dan amplitudo palung rata-rata. Lebih lanjut, Seismik amplitudo ini digunakan untuk mendapatkan peta porositas, dengan melakukan cross plot antara log porositas dan log amplitudo. Analisa ditunjukkan dari semua peta atribut ini. Dengan konteks lingkungan pengendapan, kita dapat mengidentifikasi batas yang jelas antara reef dengan lagoon, khususnya pada formasi Baturaja. Ini berarti bahwa persebaran facies sangat jelas di perlihatkan pada semua peta atribut.Seismic attribute analysis has been applied to 3D seismic data of South Sumatera Basin. This analysis is intended to map carbonate reservoir distribution, which is associated with depositional environment. The seismic attributes, which is used in interpreting the carbonate reservoir, are rms amplitude, maximum amplitude, minimum amplitude, and average trough amplitude. In addition, this seismic amplitude is used to derive the porosity map, by applying the cross plot between porosity log and amplitude. The analysis is performed by generating map of all of these attributes. In the context of depositional environment, we can identify sharp boundary between the reef and lagoon, particularly in Baturaja formation. This mean that the facies distribution is clearly seen in all attributes map."

"[ABSTRAKStudi karakterisasi reservoar merupakan salah satu studi dalam menginterpretasi reservoiar berdasarkan pada data bawah permukaan. Karakterisasi reservoir dalam penelitian ini dilakukan pada lapangan RCS yang merupakan lapangan dengan reservoar utama berupa batuan karbonat terumbu pada Formasi Tuban. Studi karakterisasi reservoar batuan terumbu sangat menarik dan pada penelitian ini dilakukan dengan pendekatan analisis petrofisik, analisis FZI dan analisis Elektrofasies. Dari keseluruhan hasil analisis ini terdapat lima tipe batuan melalui data batuan inti. Nilai FZI bervariasi mulai dari 0.145 ? 9. Nilai PHIE dan SWT bervariasi pada masing-masing yang akan dipakai pada analisis Elektrofasies. Dari hasil analisis elektrofasies terdapat lima tipe batuan di sepanjang zona interval batuan inti. Kemudian dari kombinasi keseluruhan hasil analisis ini didapat interpretasi lingkungan pengendapan bahwa lingkungan pengendapan fasies ini berada pada lingkungan carbonate platform pada bagian back barrier hingga barrier.

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ABSTRACT

Reservoir characterization study is one of a study based on the subsurface data reservoiar interpretation. Reservoir characterization for this study conducted at the RCS field with the main reservoir is carbonate rock reefs in the Tuban Formation. Reef carbonate reservoir characterization study is very interesting and in this study the research conducted by using petrophysical analysis, FZI analysis and elektrofasies approach. From the overall results of this analysis, there are five types of rock through the core rock data. FZI values ranging from 0.145 - 9. Value of PHIE and SWT varies on each that will be used in the analysis of elektrofasies. From the analysis of elektrofasies there are five types of rocks along the core interval. Then from the combination of the overall results of the analysis obtained with depositional environment interpretation that this facies depositional environment is in the carbonate platform expecially at the back barrier to barrier., Reservoir characterization study is one of a study based on the subsurface data reservoiar interpretation. Reservoir characterization for this study conducted at the RCS field with the main reservoir is carbonate rock reefs in the Tuban Formation. Reef carbonate reservoir characterization study is very interesting and in this study the research conducted by using petrophysical analysis, FZI analysis and elektrofasies approach. From the overall results of this analysis, there are five types of rock through the core rock data. FZI values ranging from 0.145 - 9. Value of PHIE and SWT varies on each that will be used in the analysis of elektrofasies. From the analysis of elektrofasies there are five types of rocks along the core interval. Then from the combination of the overall results of the analysis obtained with depositional environment interpretation that this facies depositional environment is in the carbonate platform expecially at the back barrier to barrier.]"