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"[Usaha untuk mendapatkan data seismik yang baik serta interpretasi seismik dari data eksisting pada suatu lapangan yang mempunyai struktur kompleks relatif sukar untuk dilakukan. Pembuatan model ideal untuk parameter seismik dengan menggunakan Forward Modelling diharapkan mampu untuk membuat hubungan antara kompleksitas struktur dengan data seismik yang dihasilkan.Hasil dari pembuatan Forward Modelling yang dilakukan dibandingkan dengan data real menunjukkan bahwa response seismik pada zone prospek menunjukkan trend yang sama, dimana pada zona yang mengalami struktur geologis yang kompleks, response seismik kurang bagus. Hasil pengurangan trace data real versus synthetic pada lintasan UT88-520 dan UT88-535 masih menunjukkan residu yang cukup besar, sebagai akibat dari kompleksitas strukturgeologi lapangan Tiaka. Hasil Forward Modelling dapat dijadikan sebagai pembanding dan validasi hasil seismik yang diharapkan untuk mendapatkan model seismik yang dapat menjadi acuan pada saat akuisisi seismik, agar didapatkan data seismik yang lebih baik.

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The effort to get good seismic data from very complex geological structure is very difficult; such as the case for interpreting the existing data. Ideal modeling for seismic survey using Forward Modeling hopefully can explain the correlativity between geological structural complexities and the seismic result that we get. The main result of this study show us that comparison between Forward Modeling against Real Data indicate that the trend of seismic response in prospect zone/target zone almost similar, while the seismic response in fracture zone is not clear. Subtractions results between real data against synthetic in line UT88-520 and UT88-535 still give significant remain, indicate that structural geology in Tiaka Field is very complex. The Modeling result can be use as the ideal result and can be use as validation/comparable result to get the certain model and can become reference for seismic acquisition.;The effort to get good seismic data from very complex geological structure is very difficult; such as the case for interpreting the existing data. Ideal modeling for seismic survey using Forward Modeling hopefully can explain the correlativity between geological structural complexities and the seismic result that we get. The main result of this study show us that comparison between Forward Modeling against Real Data indicate that the trend of seismic response in prospect zone/target zone almost similar, while the seismic response in fracture zone is not clear. Subtractions results between real data against synthetic in line UT88-520 and UT88-535 still give significant remain, indicate that structural geology in Tiaka Field is very complex. The Modeling result can be use as the ideal result and can be use as validation/comparable result to get the certain model and can become reference for seismic acquisition.;The effort to get good seismic data from very complex geological structure

is very difficult; such as the case for interpreting the existing data. Ideal modeling

for seismic survey using Forward Modeling hopefully can explain the

correlativity between geological structural complexities and the seismic result that

we get.

The main result of this study show us that comparison between Forward

Modeling against Real Data indicate that the trend of seismic response in prospect

zone/target zone almost similar, while the seismic response in fracture zone is not

clear. Subtractions results between real data against synthetic in line UT88-520

and UT88-535 still give significant remain, indicate that structural geology in

Tiaka Field is very complex.

The Modeling result can be use as the ideal result and can be use as

validation/comparable result to get the certain model and can become reference

for seismic acquisition., The effort to get good seismic data from very complex geological structure

is very difficult; such as the case for interpreting the existing data. Ideal modeling

for seismic survey using Forward Modeling hopefully can explain the

correlativity between geological structural complexities and the seismic result that

we get.

The main result of this study show us that comparison between Forward

Modeling against Real Data indicate that the trend of seismic response in prospect

zone/target zone almost similar, while the seismic response in fracture zone is not

clear. Subtractions results between real data against synthetic in line UT88-520

and UT88-535 still give significant remain, indicate that structural geology in

Tiaka Field is very complex.

The Modeling result can be use as the ideal result and can be use as

validation/comparable result to get the certain model and can become reference

for seismic acquisition.]"

"[Usaha untuk mendapatkan data seismik yang baik serta interpretasi seismik dari data eksisting pada suatu lapangan yang mempunyai struktur kompleks relatif sukar untuk dilakukan. Pembuatan model ideal untuk parameter seismik dengan menggunakan Forward Modelling diharapkan mampu untuk membuat hubungan antara kompleksitas struktur dengan data seismik yang dihasilkan.Hasil dari pembuatan Forward Modelling yang dilakukan dibandingkan dengan data real menunjukkan bahwa response seismik pada zone prospek menunjukkan trend yang sama, dimana pada zona yang mengalami struktur geologi yang kompleks, response seismik kurang bagus. Hasil pengurangan trace data real versus synthetic pada lintasan UT88-520 dan UT88-535 masih menunjukkan residu yang cukup besar, sebagai akibat dari kompleksitas strukturgeologi lapangan Tiaka. Hasil Forward Modelling dapat dijadikan sebagai pembanding dan validasi hasil seismik yang diharapkan untuk mendapatkan model seismik yang dapat menjadi acuan pada saat akuisisi seismik, agar didapatkan data seismik yang lebih baik.

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The effort to get good seismic data from very complex geological structure is very difficult; such as the case for interpreting the existing data. Ideal modeling for seismic survey using Forward Modeling hopefully can explain the correlativity between geological structural complexities and the seismic result that we get. The main result of this study show us that comparison between Forward Modeling against Real Data indicate that the trend of seismic response in prospect zone/target zone almost similar, while the seismic response in fracture zone is not clear. Subtractions results between real data against synthetic in line UT88-520 and UT88-535 still give significant remain, indicate that structural geology in Tiaka Field is very complex. The Modeling result can be use as the ideal result and can be use as validation/comparable result to get the certain model and can become reference for seismic acquisition.;The effort to get good seismic data from very complex geological structure

is very difficult; such as the case for interpreting the existing data. Ideal modeling

for seismic survey using Forward Modeling hopefully can explain the

correlativity between geological structural complexities and the seismic result that

we get.

The main result of this study show us that comparison between Forward

Modeling against Real Data indicate that the trend of seismic response in prospect

zone/target zone almost similar, while the seismic response in fracture zone is not

clear. Subtractions results between real data against synthetic in line UT88-520

and UT88-535 still give significant remain, indicate that structural geology in

Tiaka Field is very complex.

The Modeling result can be use as the ideal result and can be use as

validation/comparable result to get the certain model and can become reference

for seismic acquisition.;The effort to get good seismic data from very complex geological structure

is very difficult; such as the case for interpreting the existing data. Ideal modeling

for seismic survey using Forward Modeling hopefully can explain the

correlativity between geological structural complexities and the seismic result that

we get.

The main result of this study show us that comparison between Forward

Modeling against Real Data indicate that the trend of seismic response in prospect

zone/target zone almost similar, while the seismic response in fracture zone is not

clear. Subtractions results between real data against synthetic in line UT88-520

and UT88-535 still give significant remain, indicate that structural geology in

Tiaka Field is very complex.

The Modeling result can be use as the ideal result and can be use as

validation/comparable result to get the certain model and can become reference

for seismic acquisition., The effort to get good seismic data from very complex geological structure

is very difficult; such as the case for interpreting the existing data. Ideal modeling

for seismic survey using Forward Modeling hopefully can explain the

correlativity between geological structural complexities and the seismic result that

we get.

The main result of this study show us that comparison between Forward

Modeling against Real Data indicate that the trend of seismic response in prospect

zone/target zone almost similar, while the seismic response in fracture zone is not

clear. Subtractions results between real data against synthetic in line UT88-520

and UT88-535 still give significant remain, indicate that structural geology in

Tiaka Field is very complex.

The Modeling result can be use as the ideal result and can be use as

validation/comparable result to get the certain model and can become reference

for seismic acquisition.]"

"ABSTRAKSalah satu target eksplorasi panas bumi adalah zona permeabilitas tinggi, yang mana zona ini biasanya berhubungan dengan banyak struktur. Pemetaan struktur pada geologi hanya mampu menunjukkan struktur permukaan saja. Kemenerusan struktur ke bawah permukaan sulit dideteksi. Hal ini dapat dilakukan dengan analisis struktur menggunakan metode Magnetotelurik (MT), yaitu induction arrows, kurva splitting dan diagram polar. Dengan menggunakan induction arrow dan diagram polar kita dapat memetakan keberadaan anomali konduktif. Spliting pada data kurva MT pada range frekuensi tinggi biasanya terjadi karena struktur di bawah permukaan. Forward modeling 3-D pun dilakukan guna memastikan struktur pada daerah tersebut, dengan model sintetik yang lebih simple dibuat berdasarkan acuan dari hasil inversi 3-D sehingga dapat mempermudah dalam melihat respon analisis induction arrows, kurva splitting dan diagram polar data MT riil lapangan. Hasil penelitian dari penelitian Lapangan ?S? ini menunjukan adanya korelasi antara struktur geologi dengan data MT baik analisis kurva splitting, induction arrows, dan diagram polar. Korelasi tersebut memperlihatkan adanya kontrol struktur yakni Sesar Sm dan Cg terhadap hadirnya zona main conductor. Zona pemboran diorientasikan sebelah Selatan Sesar Sm berarah NW-SE, dimana berdasarkan kemiringan struktur Sm ini mengarah NE-SW.

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ABSTRAKOne of the geothermal exploration target is a zone of high permeability, which is usually associated with a lot of structure. Geological mapping of the structure is only able to show the structure of the surface. Continuity of structures beneath the surface difficult to detect. However, to look for structure, can be done by using the methods of structural analysis magnetotellurics (MT), such as, the induction arrows, splitting curves and polar diagram. By using induction arrow and diagram polar we can map the presence of anomalous conductive. Spliting the MT curve data at high frequency range usually occurs because of the structure below the surface. Forward 3-D modeling was done to ensure the structure of the region, with a more simple synthetic models are based on 3-D inversion results. The results of the Field "S" shows a correlation between the geological structure of the data is good MT splitting curve analysis, Induction Arrows, and a polar diagram. The correlation shows that the control structure of the Sm and Cg Fault zone to the presence of the main conductor. Zone drilling is oriented southern Sm Fault trending NW-SE, which is based on the slope of the structure of Sm leads NE-SW."

"Indonesia diampit dengan tiga lempeng Eurasia, Pasifik, dan Indo-Australia. Berdasarkan teori tektonik lempeng, pergerakan lempeng disebabkan oleh adanya dorongan dari arus konveksi mantel. Teori tersebut menyebabkan Indonesia mempunyai struktur-struktur geologi yang kompleks. Studi geologi struktur perlu dilakukan untuk mengetahui keadaan bawah permukaan. Mencari struktur sulit dilakukan maka dari itu, dibutuhkan metode yang tepat dalam memetakan keberadaan struktur geologi. Metode tersebut adalah atribut seismik. Penelitian ini memakai data seismik 2D sebanyak 11 lintasan. Seismik 2D dapat dimodifikasi menjadi seismik volume menggunakan Pseudo 3D sehingga dapat dilakukan atribut seismik dalam mencari struktur geologi. Metode atribut seismik yang tepat dalam memetakan struktur geologi yaitu atribut seismik curvature, coherence, dan variance. Selanjutnya, menentukan atribut terbaik dalam memetakan struktur geologi yaitu variance dan membuat surface horizon map untuk mengetahui ketinggian secara lateral. Selanjutnya, melakukan intrepretasi secara manual dengan bantuan atribut seismik variance dan menganalisis orientasi arah major fault dan gaya utama. Dengan didapat orientasi major fault Timur Laut – Barat Daya dan gaya utama berasal dari Utara – Selatan mendorong ke tengah. Selain itu, dilihat spektrum frekuensi setelah dan sebelum dilakukan Pseudo 3D untuk melihat pengaruh Pseudo 3D terhadap data seismik. Dengan hasil yang dikeluarkan berbeda frekuensi setelah dan sebelum Pseudo 3D sehingga proses Pseudo 3D mempengaruhi kualitas data seismik.

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Indonesia is flanked by three plates Eurasia, Pacific, and Indo-Australian. Based on plate tectonic theory, plate movement is caused by nudge from mantle convection current. This theory causes Indonesia to have complex geological structures. Structural Geological studies to be done to determine the sub-surface state. Finding geological structures is difficult, therfore, it takes the right method in mapping the existence of geological structures. The method is a seismic attribute. This study used 11 lines 2D seismic. 2D seismic data can be modified into seismic volumes using Pseudo 3D so that seismic attributes can be performed in search of geological structures. Precise seismic attribute methods in mapping geological structures are curvature, coherence, and variance seismic attributes. Furthermore, determine the best attributes in mapping geological structures namely variance and create a surface horizon map to know the altitude laterally. Next, perform the interpretation manually, with the help of variance seismic attribute and then analyze the orientation of major fault direction and main force. With the orientation of the major fault Northeast – Southwest and main force originating from North – South pushes to the center. In addition, look at the frequency spectrum before and after Pseudo 3D is performed to see the influence of Pseudo 3D on seismic data. With the results issued different frequencies before and after Pseudo 3D so that the Pseudo 3D procces affects the quality of seismic data."

"Pulau Jawa merupakan wilayah seismik aktif karena merupakan bagian dari Busur Sunda yang terletak di atas penunjaman antara Lempeng IndoAustralia terhadap Lempeng Eurasia. Khususnya di Jawa Timur, data terbaru maupun catatan sejarah mengatakan bahwa aktivitas gempa di Jawa Timur termasuk sangat aktif. Penelitian ini menggunakan tomografi double-difference untuk mencitrakan struktur kecepatan seismik 3D gelombang P dan S yang berkaitan dengan pola tektonik akibat zona subduksi. Data yang digunakan berasal dari katalog gempa dan katalog waktu tiba gelombang milik BMKG dengan periode perekaman dari 1 Januari 2020 hingga 31 Januari 2023. Terdapat 1.816 dari total 1.831 yang berhasil terelokasi. Proses inversi menunjukkan berkorelasi positif dengan keberadaan Cekungan Jawa Timur Utara berdasarkan seragamnya zona kecepatan rendah di area yang tersusun atas endapan dan batuan sedimen tersebut. Terdapat anomali kecepatan rendah yang diduga disebabkan oleh aktivitas magmatis di sepanjang rangkaian pegunungan berapi Jawa Timur, juga berasosiasi dengan aktifitas sesar lokal yakni Sesar Kendeng.

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Java Island is an active seismic region as it is part of the Sunda Arc, located above the subduction zone between the Indo-Australian Plate and the Eurasian Plate. Specifically in East Java, both recent data and historical records indicate high seismic activity. This study utilizes double-difference tomography to image the 3D seismic velocity structure of P and S waves related to tectonic patterns resulting from subduction zones. The data used is derived from the earthquake catalog and wave arrival time catalog owned by BMKG, covering the recording period from January 1, 2020, to January 31, 2023. Out of a total of 1,831 events, 1,816 were successfully relocated. The inversion process shows a positive correlation with the presence of the North Java Basin, indicated by a consistent low-velocity zone in the area composed of sedimentary deposits and rocks. Low-velocity anomalies are suspected to be caused by magmatic activity along the volcanic mountain range of East Java, also associated with local fault activity, the Kendeng Fault."

"Penelitian ini bertujuan untuk mendapatkan perkiraan struktur geologi dalam satuan pertrubasi kecepatan di wilayah sekitar Jayapura, Papua dengan sumber data katalog gempa bumi BMKG tahun 2018 Januari hingga 2022 Februari. Event gempa bumi yang banyak merupakan manifestasi dari kedaan geologi tersebut Penting untuk memahami keberadaan struktur bawah permukaan untuk meningkatkan kewaspadaan untuk mitigasi di wilayah ini. Digunakan metode tomografi seismik double-difference untuk mendapatkan tomogram kecepatan Vp, Vs, dan juga rasio Vp/Vs secara horisontal dan vertikal. Dari hasil relokasi gempa dan juga tomogram, terlihat adanya klasterisasi gempa di sekitar Sesar Mamberamo yang menjadikan seismisitas wilayah sekitar Kota Jayapura dan sekitarnya merupakan zona seismik aktif.

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This research aims to obtain an estimation of the geological structure within the velocity perturbation units in the vicinity of Jayapura, Papua, using earthquake catalog data from BMKG from January 2018 to February 2022, totalling 2100 events. The high number of earthquake events is a manifestation of the geological condition. It is important to understand the subsurface structure to enhance preparedness for mitigation in this region. The doubledifference seismic tomography method is used to obtain Vp, Vs, and Vp/Vs in vertical and horizontal section. From the earthquake relocation results and tomograms, there is observed clustering of earthquakes around the Mamberamo Fault, indicating that the seismicity in the vicinity of Jayapura and its surrounding areas is an active seismic zone."

"Berdasarkan statistik BNPB, Jawa Tengah menjadi Provinsi dengan bencana longsor terbanyak di Indonesia sepanjang tahun 2021–2023 sebanyak 1283 peristiwa, dengan 427 di antaranya terjadi di Kebumen. Pada Kampus Lapangan Geologi Karangsambung, Kab. Kebumen, Jawa Tengah sejumlah lahan telah ditimbun tanah untuk rencana pembangunan dengan longsoran rotasi yang pernah terjadi. Oleh karena itu, dilakukan identifikasi potensi longsor beserta geologinya di daerah Karangsambung pada area timbunan tanah baru. Penelitian ini melibatkan studi lapangan dengan metode geolistrik resistivitas dan data SPT untuk mengetahui kekuatan daya dukung tanah. Penelitian mencakup enam lintasan sepanjang 195–245 meter dengan spasi elektroda 5 meter dan konfigurasi Wenner-Schlumberger. Keluaran yang diperoleh berupa penampang resistivitas 2D yang dikorelasikan dengan data SPT, plan map 3D, serta model resistivitas 3D. Hasil penampang resistivitas 2D menunjukkan bahwa terdapat zona resistivitas tinggi 270–13.293 Ωm di daerah timur laut penelitian. Zona resistivitas tinggi ini merupakan rekahan batulempung selebar 5–13 meter di permukaan dengan ketebalan 10–15 meter yang di bawahnya merupakan intrusi batu andesit. Selain itu umumnya daerah penelitian terdiri atas lempung lanauan padat di permukaan dengan ketebalan 3–33 meter dan resistivitas 0,5–90 Ωm, serta lempung pasiran yang sangat padat di bawahnya dengan ketebalan lebih dari 15 meter dan resistivitas 0,01–30 Ωm. Berdasarkan hasil tersebut terdapat potensi longsor di timur laut daerah penelitian yang melewati lintasan LKR01, LKR02, dan LKR03, tepatnya pada zona resistivitas tinggi. Keberadaan potensi longsor ini diharapkan dapat menjadi acuan terkait pengawasan pembangunan di Kampus Lapangan Geologi Karangsambung.

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Based on BNPB statistics, Central Java is the province with the most landslide disasters in Indonesia throughout 2021-2023 with 1283 events, 427 of which occurred in Kebumen. At the Karangsambung Geological Field Campus, Kebumen Regency, Central Java, a number of lands have been stockpiled for development plans with rotational landslides that have occurred. Therefore, an identification of landslide potential and its geology in Karangsambung area in the area of new landfill was conducted. This research involved field study using geo-electrical resistivity method and SPT data to determine the bearing capacity of the soil. The research included six passes along 195-245 meters with 5 meters electrode spacing and Wenner-Schlumberger configuration. The output is 2D resistivity cross section correlated with SPT data, 3D plan map, and 3D resistivity model. The 2D resistivity cross section results show that there is a high resistivity zone of 270-13,293 Ωm in the northeast area of the study. This high resistivity zone is a fractured claystone 5-13 meters wide at the surface with a thickness of 10-15 meters under which is an andesite intrusion. In addition, the study area generally consists of dense silt loam at the surface with a thickness of 3-33 meters and a resistivity of 0.5-90 Ωm, and very dense passive loam underneath with a thickness of more than 15 meters and a resistivity of 0.01-30 Ωm. Based on these results, there is a potential for landslides in the northeast of the research area that passes through the LKR01, LKR02, and LKR03 tracks, precisely in the high resistivity zone. The existence of this landslide potential is expected to be a reference related to development supervision in Karangsambung Geological Field Campus."

"Dalam eksplorasi geofisika terutama eksplorasi panasbumi, ada dua kriteria dalam memilih target pengeboran yang baik yaitu zona dengan temperatur tinggi dan zona dengan permeabilitas tinggi. Zona dengan temperatur tinggi berasosiasi dengan posisi keberadaan heat source dan juga daerah up flow, sementara zona dengan permeabilitas tinggi disebabkan karena adanya suatu patahan atau rekahan yang berhubungan dengan struktur geologi bawah permukaan.Pada dasarnya, struktur geologi bawah permukaan dapat diindikasikan dengan adanya kontras resistivitas yang disebabkan karena fluida panas dan konduktif yang mengisi zona-zona rekahan dan patahan, atau disebabkan karena perbedaan formasi dengan resistivitas yang berbeda. Berdasarkan hal tersebut, dilakukan pembuatan model sintetik 3D mengenai berbagai struktur geologi permukaan dan dilakukan analisispolar diagram, induction arrow dan splitting curvesehingga diperoleh pemahaman dan karakteristik setiap model sintetik yang kemudian diimplementasikan pada data riil MT. Penelitian ini menghasilkan bahwa diagram polar dapat menunjukkan adanya kontras resistivitas di bawah permukaan dimana kontras resistivitas ini dapat berhubungan dengan struktur geologi, dan bahwainduction arrow dapat menunjukkan objek yang lebih konduktif di bawah permukaan serta splitting nya kurva MT dapat memberikan informasi dekat atau jauhnya suatu stasiun pengukuran MT terhadap batas kontras resistivitas atau batas suatu struktur.

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In geothermal explorations, there are two criteria to determine the best drilling target zone: high temperature zone and high permeability zone. High temperature zone is associated with the position of heat source, while high permeability zone is associated with subsurface geological structure (fault and fracture). In general, subsurface geological structure can be indicated by subsurface resistivity contrast which caused by conductive fluids filling the fracture zone or caused by different formation with different resistivity. The resistivity contrast will produce impedance polarization of MT data as the response of the structure which will be represented graphically by polar diagram. It also will produce splitting on the MT curve. While position of conductive anomaly can be detected by induction arrow. Therefore, 3D forward modeling is carried out to have knowledge about concept and characteristics of polar diagram, induction arrow and splitting curve of various synthetic geological structure to be implemented on real MT data.

This research conclude that elongation of polar diagram could provide information on the strike direction in which polar diagram give the response of relatively parallel or perpendicular to the strike, while the magnitude of induction arrow could show where the conductive zone and the distance between MT stations with the location of structure will affect the frequency at which the splitting MT curve occurs."

"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.

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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."

"Cekungan Teluk Meksiko (GOM) merupakan salah satu mega area penghasil hidrokarbon di dunia yang telah dieksplorasi dan diproduksi selama lebih dari 100 tahun. Salah satu tahapan penting setelah eksplorasi lapangan adalah melakukan evaluasi atau penilaian untuk pengembangan lapangan sebagai takaran seberapa besar akumulasi hidrokarbon yang dapat diambil. Pada penelitian kali ini akan dibangun model geologi berdasarkan data seismik dan data sumur yang dapat menggambarkan distribusi dan geometri model fasies untuk setiap lingkungan pengendapan dalam suatu kerangka struktur 3D serta properti petrofisika pada distribusi reservoar dalam setiap model lapisan. Pemodelan reservoar tersebut didasarkan oleh hasil interpretasi dan analisa dari integrasi visualisasi beberapa attribut seismik yang berkorelasi terhadap penentuan struktur patahan maupun penentuan lithologi fasies serta distribusi parameter petrofisik yang memungkinkan. Hasil perhitungan volumetrik dari evaluasi lapangan ini dapat dijadikan referensi untuk menghasilkan rekomendasi maupun optimalisasi nilai keekonomian dari cadangan gas lapangan Gulf of Mexico.

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Gulf of Mexico Basin (GOM) is one of the mega-producing areas of hydrocarbon in the world that have been explored and produced for over 100 years. One of important step after exploration of the field is to conduct an evaluation or appraisal for field development as a measure of how large an accumulation of hydrocarbons that can be taken.

This study is to construct the geological model based on seismic data and well data that can describe the distribution and geometry of facies models for each deposition environment in a 3D structural framework and also the reservoir petrophysical properties distribution for each layer model. Reservoir modeling is based on the results of interpretation and analysis from the integration of visualization of some seismic attributes which are correlated to the structural identification, distribution of lithofacies, and distribution of possible petrophysical properties.

Results of volumetric calculations from this field evaluation can be used as a reference in providing recommendations and optimizing economic value of gas reserves (GIIP) in the Gulf of Mexico field."