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SUBSURFACE GEOLOGICAL INTERPRETATION OF THE NORTH SUNDA ASRI BASIN BASED ON SVD ANALYSIS AND GRAVITY ANOMALY MODELING Hayu Nurfaidah; Imam Setiadi; Muhammad Sarkowi; Ordas Dewanto
BULLETIN OF THE MARINE GEOLOGY Vol 38, No 1 (2023)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.38.1.2023.833

Abstract

The Sunda Asri Basin is dominated by normal faults and has little compressional structure. This basin consists of several depocenters with a thickness of up to 6000 m. Among the geophysical methods, gravity analysis has proven to be effective in determining the bedrock configuration and identifying sedimentary basins. This study aims to analyze sedimentary sub-basin patterns, basement height structures, faults, and bedrock configuration using trend surface analysis of polynomial filters. The analysis of polynomial filter show that a 10th-order anomaly yields optimal results. The high correlation value of 0.990925 provides the suitability of a 10th-order anomaly for qualitative interpretation. Spectral analysis results indicate an average bedrock depth of about 2.75 km within the Sunda Asri Basin. Furthermore, this analysis reveals the presence of 14 sedimentary sub-basin patterns in this area. The gravity modeling results indicate that the top layer has a density value of 2.37 g/cc, which interpreted as Pleistocene Tertiary sediment. The second layer consists of Tertiary-Miocene sediment with a density value of 2.28 g/cc, while the third layer comprises of Pre-Tertiary sedimentary rock at a density of 2.02 g /cc. The bottom layer of the model corresponds to metamorphic bedrock with a density 2.7 g/cc. SVD (Second Vertical Derivative) analysis successfully identified the presence of normal and thrust fault structures
Analysis of Unconventional Oil and Gas Reservoirs using Well Logging, Geochemical and Seismic Data: Analisis Reservoar Migas Non-Konvensional Menggunakan Data Well Logging, Geokimia, dan Seismik Rahmat Catur Wibowo; Aryka Claudia Eka Putri; Ordas Dewanto
JURNAL GEOCELEBES Vol. 7 No. 2: October 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i2.20603

Abstract

Since conventional oil and gas is under a depletion phase, unconventional oil, and gas have become prime candidates for current and future oil and gas production. Based on this, investment and research have increased significantly related to unconventional oil and gas exploitation, especially in the North East Java Basin, one of the sedimentary basins producing oil and gas. The research was conducted in the form of well-logging, geochemical, and seismic data analysis to determine the quality and quantity of oil and gas reservoirs. The thickness and TOC value of the reservoir were determined using well-logging data using the Passey method, resulting in a thickness ranging from 900-954 ft and an average TOC value of 3.87 Wt% in the Kujung III Formation. Based on geochemical data analysis, the reservoir has type II kerogen with an immature-early mature maturity level (Ro and Tmax). Meanwhile, based on seismic data, the reservoir thickens to the northwest, ranging from 500-600 m. Unconventional oil and gas reservoirs in the research area have the potential to be developed because they meet several criteria, such as being rich in organic material and thick, even though the maturity level is still in the immature phase. It is estimated that deeper areas will produce different levels of maturity as pressure and temperature increase.
Prediksi Fluida Hidrokarbon Menggunakan Amplitude Versus Offset (AVO) di Lapangan “CHA”, Cekungan Sumatera Selatan Rahmat Catur Wibowo; Istifani Ferucha; Muh Sarkowi; Ordas Dewanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 4 (2020): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i4.526

Abstract

Lapangan “CHA” yang berada di Sub-Cekungan Palembang, Cekungan Sumatera Selatan, merupakan lapangan tua yang hingga saat ini masih dilakukan eksplorasi dan eksploitasi. Dalam penelitian ini, zona target berada pada Formasi Talang Akar yang secara petroleum system diketahui sebagai source rock dan reservoar. Untuk mengetahui kandungan fluida hidrokarbon yang terkandung dalam reservoar tersebut, maka dilakukan prediksi fluida dengan menggunakan metode Amplitude Versus Offset (AVO). Data yang digunakan dalam penelitian ini terdiri atas data 3D pre-stack time migration dan 2 data sumur (CHA-1 dan CHA-2) dengan kedalaman 1226-1300 ms pada sumur CHA-1 dan 1262-1340 ms pada sumur CHA-2. Berdasarkan analisis AVO, dapat diketahui bahwa zona target penelitian termasuk ke dalam AVO kelas I yang diketahui sebagai high impedance contrast sand serta memiliki respon penurunan AVO seiring dengan bertambahnya offset. Sehingga, dapat diketahui bahwa reservoar pada zona target tidak terindikasikan keberadaan gas, melainkan terindikasi sebagai zona wet sand yang mengandung fluida berupa minyak. Hasil tersebut juga didukung dengan nilai saturasi air sebesar 48.27% pada sumur CHA-1, sedangkan pada sumur CHA-2 sebesar 36.85%.
Pembuatan Perkebunan dengan Air Pegunungan untuk Meningkatkan Penghasilan di Desa Batu Keramat Kecamatan Kota Agung Timur Ordas Dewanto; Bambang Irawan; Rahmat Catur Wibowo
Jurnal Abdimas Multidisiplin Vol. 1 No. 1 (2022): Oktober
Publisher : Penerbit Goodwood

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35912/jamu.v1i1.1436

Abstract

Purpose: water utilization is used to increase or create new types of business in the plantation sector. There are 2 groups of farmers and livestock that serve as partners, namely Eko Makmur Sejahtera and Yamin Batu Keramat. Both partners already have farming businesses such as rice, vegetables, and fruits. The two partners' farms are already available with sufficient yields. Method: The Participatory Rural Approisal method which involves the farmer community in the overall activity. The implementation of this method is through provide counseling, training, and giving demonstrations as well as evaluation to see the effectiveness of the program, so that the program will be socialized properly and efficiently. Result: The Unila Service Team offered a solution to increase farmers community monthly income, so plantations were made. The Unila Service Team provides insight and knowledge on how to optimize the manufacture of plant stands, water reservoirs, and design of waterways to the households; Provide training on business management, marketing systems and management, as well as financial management, especially those related to plantation business; provide knowledge and insight to target audiences, especially farmer community, by providing training and practice on determining groundwater depth for well construction. Limitation: Initial and final evaluation of the service area; Counseling to the community; Implementation of the design of water use from the highlands to the partner site; and make plantations with the aim of increasing business.
Identifikasi Total Organic Carbon pada Sumur BTO Berdasarkan Data Core dan Data Log di Jawa Timur Utara Mulyatno, Bagus Sapto; Dewanto, Ordas; Dani, Ilham; Kumalasari, Isti Nur; Wibisono, Ambrosius Hernawan; Suharso
Prosiding Seminar Nasional Ilmu Teknik Dan Aplikasi Industri Fakultas Teknik Universitas Lampung Vol. 6 (2023): Prosiding Seminar Nasional Nasional Ilmu Teknik dan Aplikasi Industri (SINTA) 2023
Publisher : Fakultas Teknik Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Peningkatan kebutuhan hidrokarbon yang terjadi hingga saat ini disebabkan karenaminyak dan gas bumi masih menjadi sumber energi utama yang digunakan olehmanusia di kehidupan sehari-hari. Untuk mengatasi hal tersebut perlu dilakukanekplorasi terhadap daerah – daerah yang diaggap mampu menghasilkan minyak dangas bumi. Dalam metode geofisika ada sebuah metode yang dapat digunakan untukmenganalisis atau mengatahui sumber penghasil minyak dan gas bumi, metodetersebut yaitu metode well logging. Well logging adalah suatu teknik untukmendapatkan data bawah permukaan dengan menggunakan alat ukur yangdimasukkan ke dalam lubang sumur untuk evaluasi formasi dan identifikasi ciri-ciribatuan di bawah permukaan. Untuk mengetahui potensi penghasil minyak dan gasbumi dibutuhkan analisis berupa batuan induk (Source Rock) dengan metodeperhitungan Total Organic Carbon (TOC). Batuan induk sendiri merupakan batuanyang mengandung bahan organik yang nantinya akan menghasilkan minyak dan gasbumi
Multiple Linear Regression Method for Thermal Maturity Prediction Based On Well Logs Wibowo, Rahmat Catur; Sarkowi, Muh; Dewanto, Ordas; Mulyatno, Bagus S; Dani, Ilham
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.2.10270

Abstract

Accurate estimation of thermal maturity is essential in characterizing a source rock, especially using vitrinite reflectance (Ro). The limitations of laboratory data related to the high cost of analysis require a special reliable method to measure the Ro value indirectly in the source rock layer. The proposed method is a continuous prediction of the value of Ro from well logs data using the Multiple Linear Regression (MLR) technique in the Palembang Sub-Basin, South Sumatra Basin. A total of 25 Ro data from 2 wells (RCW-01 and RCW-02) are available from the laboratory's core data analysis results. The Ro data varies from 0.39% to 0.76%, with an average of 0.54%. Prediction of the value of Ro is carried out using the MLR method, which is then carried out training and validation for continuous Ro. The training was carried out using one well (RCW-01) at 2287-3027 m and testing at other intervals (1848-2286 m). The results of the training show an estimation accuracy of R2 0.99, while the test results produce R2 0.81. The MLR formula in the RCW-01 well was then applied to the RCW-02 well for the validation test phase. The well RCW-02 produces a good correlation estimate equal to R2 0.85. Prediction of the value of Ro using the MLR method can be used to evaluate the source rock layer of a sedimentary basin in the form of a continuous interval.
Karakterisasi Reservoar menggunakan Inversi AI (Accoustic Impedance) pada Lapangan Stratton, Texas Selatan Isti Nur Kumalasari; Ordas Dewanto; Bagus Sapto Mulyatno
Jurnal Teknik dan Teknologi Indonesia Vol. 2 No. 2 (2024): Juni : Jurnal Teknik dan Teknologi Indonesia (JTTI)
Publisher : Arsil Media

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Currently, oil and natural gas are still the main energy needed by society. To maintain energy security, it is necessary to carry out studies on the characterization of oil and gas field reservoirs. Reservoir characterization is a crucial process in oil and gas field analysis. In this research, reservoir characterization was carried out using AI (Acoustic Impedance) inversion. AI inversion was carried out to determine the distribution of physical parameters in the research area. From the results it can be seen that the AI ​​values ​​based on log data and seismic data are similar. The inversion results show that the gas-filled reservoir zone of the E41 formation has a low AI value. The gas-filled reservoir based on log data is at a depth of 1570-1580 ms and has a value range of 25843-28839 (ft/s*g/cc). The results of the AI ​​inversion volume section show that the gas distribution in the Stratton Field is indicated by low AI values ​​in the West-East distribution direction.
Identifikasi Jenis Fluida Pada Zona Target Hidrokarbon Berdasarkan Nilai Saturasi Air (Sw) di Lapangan Migas “BGS” Cekungan Jawa Timur Utara Bagus Sapto Mulyatno; Ordas Dewanto; Muhammad Sarkowi; Suharso
Jurnal Geosains dan Remote Sensing Vol 5 No 1 (2024): JGRS Edisi Mei
Publisher : Department of Geophysical Engineering, Faculty of Engineering, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jgrs.ft.unila.312

Abstract

Cekungan Jawa Timur Utara adalah back arc basin yang terkenal dengan kekayaan sumber daya hidrokarbonnya, menjadi fokus utama industri migas di Indonesia. Pada cekungan ini terdapat lapangan migas yang memiliki potensi signifikan dalam hal produksi minyak dan gas bumi. Untuk mengoptimalkan potensi ini, maka perlu pemahaman yang mendalam terkait jenis fluida yang ada pada reservoar. Salah satu parameter fisik yang penting dalam mengidentifikasi jenis fluida di dalam reservoar adalah nilai saturasi air (Sw). Tujuan penelitian ini adalah mengidentifikasi jenis fluida berdasarkan nilai saturasi air pada 7 (tujuh) sumur yaitu BGS1, BGS2, BGS3, BGS4, BGS5, BGS6, dan BGS7. Penelitian ini menggunakan metode Well Logging dengan data log yang digunakan yaitu log gamma ray, log resistivitas, log porositas, dan log densitas. Berdasarkan hasil penelitian, pada Sumur BGS1 terdapat 5 zona dengan fluida minyak dan gas, sumur BGS2 terdapat 2 zona dengan fluida minyak dan gas, sumur BGS3 terdapat 2 zona dengan fluida minyak dan gas, sumur BGS4 terdapat 2 zona dengan fluida minyak, sumur BGS5 terdapat 1 zona dengan fluida minyak, sumur BGS6 terdapat 3 zona dengan fluida minyak dan gas, dan sumur BGS7 terdapat 1 zona dengan fluida minyak. Berdasarkan hasil analisis lapisan reservoar pada sumur BGS1, BGS2, BGS3, BGS4, BGS5, BGS6 dan BGS7 Cekungan Jawa Timur Utara secara umum didapatkan nilai saturasi air sebesar 20% - 70% dengan fluida gas-minyak.
Analisis Zona mengandung Hidrokarbon dan Elektrofaseis pada Formasi Kujung I, Cekungan Jawa Timur Kumalasari, Isti Nur; Winardhie, Ignatius Sonny; Wibowo, Rahmat Catur; Dewanto, Ordas
Jurnal Teknologi dan Inovasi Industri (JTII) Vol 4, No 1 (2023)
Publisher : Fakultas Teknik, Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtii.v4i1.59

Abstract

Reservoir karbonat berkontribusi lebih adri 50% untuk menghasilkan minyak dan gas bumi. Maka dari itu, karakterisasi reservoir pada batuan karbonat penting untuk dilakukan. Untuk meningkatkan keakuratan hasil karakterisasi reservoir diperlukan integrasi dari beberapa data yang tersedia. Pada penelitian ini karakterisasi reservoir dilakukan dengan menggunakan data sumur dan data seismic pada lapangan “X” Formasi Kujung I, Cekungan Jawa Timur. Hasil analisis data sumur menunjukkan keberadaan zona target mengandung hidrokarbon pada kedalaman 4635-4714 ft (sumur IN-1), 4617-4684 ft (sumur IN-2). Sedangkan, hasil analisis pada sumur IN-3 tidak ditemukan keberadaan hidrokarbon. Hal ini diperkuat dengan hasil analisis peta struktur waktu yang menunjukkan sumur IN-1 dan IN-2 berada pada struktur tinggian, sedangkan sumur IN-2 berada pada struktur rendah. Analisis elektrofasies bentuk kurva gamma ray pada sumur IN-1 dan IN-2 adalah cylindrical, sedangkan bentuk log gamma ray pada sumur IN-3 adalah bell shape. Hasil analisis elektrofasies dan interpretasi reflektor data seismic mengindikasikan bahwa, lapisan karbonat pada sumur IN-1 dan IN-2 diasosiasikan dengan pertumbuhan karbonat keep-up, puncak dari karbonat hidup dan terjaga di dekat permukaan air laut yang dangkal. Sedangkan, lapisan karbonat di area sumur IN-3 diasosiasikan dengan pertumbuhan karbonat give up.
Identifikasi Akuifer Air Tanah menggunakan Metode Geolistrik di Perumahan Gang Jati Baru, Hajimena, Natar, Lampung Selatan Kumalasari, Isti Nur; RahmiMulyasari, Rahmi; Dewanto, Ordas; Mulyatno, Bagus Sapto; Wibowo, Rahmat Catur; Maulida, Nanda Hanyfa; Hidayatika, Akroma; Hesti, Hesti; Dani, Ilham; Erfani, Sandi
Jurnal Riset Fisika Indonesia Vol 5 No 2 (2025): Juni
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v5i2.6504

Abstract

Groundwater is a basic human need. However, the residents of Perumahan Gang Jati Baru, Hajimena, Natar face significant challenges in meeting their water demands, particularly during the dry season when water availability is critically reduced. To explore groundwater resources in Perumahan Gang Jatibaru, geoelectric measurements need to be conducted. The Schlumberger configuration is used for 1D measurements, while the Wenner-Schlumberger configuration is used for 2D data acquisition. The modeling results indicate the presence of shallow groundwater aquifers at depths ranging from 11.1 to 28.3 meters, and deeper aquifers at depths between 42.7 and 79 meters, characterized by low resistivity values of approximately 13.2 13.2 ohm.m. These findings are corroborated by the 2D resistivity modeling conducted at the study site, which reveals a shallow low-resistivity anomaly (<15.2 13.2 ohm.m) occurring at depths of 10 to 28 meters.     
Co-Authors A Raka Abriyansyah A Yuliantina Ade Yogi Aldis Ramadhan Alghifarry, Muhammad Budzar Andika Widyasari Aryka Claudia Eka Putri Ayu Yuliani Bagus Sapto Mulyatno Bambang Irawan Bambang Irawan Bambang Soegijono Beny Chasandra Damayanti, Elok Dani, Ilham Darsono Darsono Egi Ramdhani Egi Ramdhani Erfani, Sandi Febrina Bunga Tarigan Hayu Nurfaidah Hesti Hesti Hidayatika, Akroma I Gede Boy Darmawan Ignatius Sonny Winardhie Ilham Dani Imam Setiadi Isti Nur Kumalasari Istifani Ferucha Istifani Ferucha Karyanto, Karyanto Kumalasari, Isti Nur Muh Sarkowi Muhammad Sarkowi Muhammad Sarkowi Mulyatno, Bagus S Nanang Yulianto Nanda Hanyfa Maulida Ni Putu Juniari Paulus Leonardo Manurung Rafi Maulana Rafi Rilo Pambudi Rahmi Mulyasari RahmiMulyasari, Rahmi Restu Ningsih Rita Aprilia Riza Rahardiawan Ryan Donovan Sri Rizky Suci Ariska Suharso Suharso Suharso Suharso Suharso Suharso Syamsurijal Rasimeng Varenza Novita Yandi Wibisono, Ambrosius Hernawan Wibowo, Rahmat Catur WP Prihadita Yandi, Varenza Novita