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All Journal POSITRON Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Jurnal RISET Geologi dan Pertambangan JGE (Jurnal Geofisika Eksplorasi) JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal Geosaintek JOURNAL ONLINE OF PHYSICS Jurnal Geocelebes Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Indonesian Physical Review Journal of Engineering and Scientific Research (JESR) Jurnal Geosains dan Remote Sensing (JGRS) Journal of Innovation and Technology Teknika Sains : Jurnal Ilmu Teknik Buguh: Jurnal Pengabdian Kepada Masyarakat Journal of Applied Science, Engineering and Technology (J. ASET) Jurnal Riset Fisika Indonesia JURNAL TEKNIK GEOLOGI : Jurnal Ilmu Pengetahuan dan Teknologi Seminar Nasional Insinyur Profesional (SNIP) Prosiding Seminar Nasional Hasil Penelitian Sains, Teknik dan Aplikasi Industri Fakultas Teknik Universitas Lampung Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Abdimas Multidisiplin Jurnal Teknologi dan Inovasi Industri Jurnal Geosaintek Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Wibowo, Rahmat Catur
Jurusan Teknik Geofisika, Fakultas Teknik, Universitas Lampung
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Journal : Jurnal RISET Geologi dan Pertambangan

 1 
Geothermal Reservoir Identification based on Gravity Data Analysis in Rajabasa Area- Lampung Muh Sarkowi; Rahmat Catur Wibowo
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 31, No 2 (2021)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2021.v31.1164

Abstract

Gravity research in the Rajabasa geothermal prospect area was conducted to determine geothermalreservoirs and faults as reservoir boundaries. The research includes spectrum analysis and separation of the Bouguer anomaly to obtain a residual Bouguer anomaly, gradient analysis using the second vertical derivative (SVD) technique to identify fault structures or lithological contact, and 3D inversion modeling of the residual Bouguer anomaly to obtain a 3D density distribution subsurface model. Analysis was performed based on all results with supplementary data from geology, geochemistry, micro-earthquake (MEQ) epicenter distribution map, and magnetotelluric (MT) inversion profiles. The study found 3 (three) geothermal reservoirs in Mount Balirang, west of Mount Rajabasa, and south of Pangkul Hot Spring, with a depth of around 1,000-1,500 m from the ground level. Fault structures and lithologies separate the three reservoirs. The location of the reservoir in the Balirang mountain area corresponds to the model data from MEQ, temperature, and magnetotelluric resistivity data. The heat source of the geothermal system is under Mount Rajabasa, which is indicated by the presence of high-density values (might be frozen residual magma), high-temperature values, and the high number of micro-earthquakes epicenters below the peak of Mount Rajabasa.
INVERSI GEOSTATISTIK MENGGUNAKAN ANALISA MULTI-ATRIBUT STEPWISE REGRESSION UNTUK KARAKTERISASI RESERVOIR Rahmat Catur Wibowo; Suci Ariska; Ordas Dewanto
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 30, No 2 (2020)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2020.v30.1088

Abstract

Eksplorasi dan produksi pada reservoir tight sand sampai saat ini masih memiliki tantangan tersendiri karena karakterisitik porositas dan permeabilitas yang rendah. Penelitian ini dilakukan untuk menganalisis karakteristik reservoir tight sand berdasarkan peta persebaran properti log menggunakan inversi impedansi akustik (IA) dan analisis multi-atribut. Analisis multi-atribut stepwise regression adalah suatu metode yang menggunakan atribut-atribut yang paling baik untuk memprediksi log target dengan melalui proses trial and error. Pemilihan atribut seismik yang tepat dapat memberikan penggambaran zona target yang lebih baik. Penelitian ini dilakukan untuk memperoleh peta struktur geologi bawah permukaan, volume impedansi akustik. Kemudian dilakukan analisis multi-atribut untuk mendapatkan prediksi volume property log yang mencakup pseudo gamma-ray, densitas, dan porositas dengan menggunakan metode stepwise regression. Hasil inversi seismik IA dan analisis multi-atribut stepwise regression menunjukkan reservoir dengan fluida berupa gas, serta litologi tight sand yang memiliki rentang nilai IA sebesar 22.000 ((ft/s)*(g/cc)) sampai dengan 45.000 ((ft/s)*(g/cc)), densitas 2,25 g/cc sampai dengan 2,6 g/cc, dan porositas 5% sampai 12%. Peta densitas dan porositas yang diperoleh dari analisa multi-atribut menunjang tahap eksplorasi dan produksi jangka panjang. Hal tersebut terkait upaya untuk meningkatkan pemahaman tentang perangkap stratigrafi, dan kemenerusan lapisan reservoir. ABSTRACT – Geostatistical Inversion Using Multi-attribute Stepwise Regression for Reservoir Characterization. Exploration and production of tight sand reservoirs are still challenging due to their low porosity and permeability characteristics. This study used acoustic impedance inversion and multi-attribute analysis to analyze the tight sand reservoir characteristics based on the log property distribution map. Stepwise regression multi-attribute analysis is a method that uses the best attributes to predict the target log, which is carried out through a trial and error process. The ability to select a correct seismic attribution can provide a better depiction of the target zone. This research was conducted to obtain a subsurface geological structures map, acoustic impedance volumes. The multi-attribute analysis was performed to predict volume log properties such as pseudo-gamma-ray, density, and porosity, by using the stepwise regression method. The results of acoustic impedance seismic inversion and stepwise regression multi-attribute analysis show that the reservoir contains gas fluid with tight sand lithology, which has a range of acoustic impedance values of 22,000 ((ft/s)*(g/cc)) to 45,000 ((ft/s)*(g/cc)), the density of 2.25 g/cc to 2.6 g/cc, and porosity of 5% to 12%. The density and porosity maps obtained from the multi-attribute analysis can support the long-term exploration and production stages. The aims are to improve the primary recovery and tertiary recovery, understanding the stratigraphic traps, and the continuity of reservoir layers.
Co-Authors Adelyra, Sabrina Adhani, Alika Tabriza Adhi Wibowo Ahmad Zaelani Ahmad Zaenudin Ahmad Zaenudin Aldika Rizkiano Aldika Rizkiano Alghifarry, Muhammad Budzar Alia Puja Pertiwi Alimuddin Muchtar Andika Widyasari ANDRI KURNIAWAN Anggraini, Serly Annur Istikomah Arianto, Khalila Wardah Aryka Claudia Eka Putri Bagus Sapto Mulyanto Bagus Sapto Mulyatno Bagus Sapto Mulyatno Bambang Irawan Bulan, Novita Putri Damayanti, Elok Dani, Ilham Destawan, Ridho Dewi Wijayanti Dewi Wijayanti Dewi, Soraya Tiana Diah Ega Safitri Dianti, Amelia Dikpride Despa Ditha Arlinsky Ar Egi Ramdhani Ependy, Julpan Erfani, Sandi Erfani, Sandri Fachri Aldi Pramudya Fatuha, Akmal Alfian Febrina Bunga Tarigan Gaghana, Geo Alfriza Haerudin Halim, Muhammad Rizqi Hanif, Irfan Hayu Nurfaidah Hesti Hesti Hidayatika, Akroma Ignatius Sonny Winardhie Imam Fahrur Rozi Indra Arifianto Indragiri, N Muhammad Irma Nurliza Lumbantoruan Isti Nur Kumalasari Istifani Ferucha Istikomah, Annur Iwasaki, Kireina Putri Jochanan Benaya Lumban Tobing Karyanto, Karyanto Karyanto, Karyanto Khamada, Aufar Farrell Khansa, M. Roid Billy Khotimah, Ayu Khousnul Kumalasari, Isti Nur Kurniasih, Aulia Lola Anjelika Lubis, Yazid Pangaloan Lumbantoruan, Irma Nurliza Luthfi Rahmawati Maulia, Ikram Mazzaluna, Haidar Prida Meilinda, Alda Mirnawati Mirnawati Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muhammad Budisatya Wiranatanagara Muhammad Sarkowi Mulyanto, Bagus Sapto Mulyatno, Bagus S Mulyatno, Bagus Sapto Nanda Hanyfa Maulida Nandi Haerudin Nasik, Ahmad Nurfaidah, Hayu Nurlaili, Jesica Nurrochman, Arsy Octavia Melani Ordas Dewanto Ordas Dewanto Ordas Dewanto Paulus Leonardo Manurung Pradityo Riyadi Pratama, Tectona Putra Epriyan Pujami, Albertus Novridel Rahma Rafi Rilo Pambudi Rahmawati, Luthfi Rahmi Mulyasari RahmiMulyasari, Rahmi Regina Febryzha Sawitri Restu Ningsih Rosa, Winda Aprilia Rustadi ., Rustadi Rustadi Rustadi Sabarila, Marisa Salsabilla, Kharisma Saragih, Yosafat Sari, Okta Mulya Sarkowi, Muhammad Sawitri, Regina Febryzha Siska Erna Sephiana Situmorang, Taruli Suci Ariska Suci Ariska Suci Kurniati Suharno Suharno Suharno Suhayat Minardi Syamsurijal Rasimeng Syuhada, Muhammad Farrel Trias Annisa Fara Triyan, Aldi Muhammad Varenza Novita Yandi Voanda, Dinda Fitri Yandi, Varenza Novita Yogi, Ida Bagus Suananda