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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

Wibowo, Rahmat Catur

Jurusan Teknik Geofisika, Fakultas Teknik, Universitas Lampung

Author-ID : 2390248

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Gas Saturated Sandstone Reservoir Modeling Using Bayesian Stochastic Seismic Inversion Rahmat Catur Wibowo; Ditha Arlinsky Ar; Suci Ariska; Muhammad Budisatya Wiranatanagara; Pradityo Riyadi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020
Publisher : UIR PRESS

This study has been done to map the distribution of gas saturated sandstone reservoir by using stochastic seismic inversion in the “X” field, Bonaparte basin. Bayesian stochastic inversion seismic method is an inversion method that utilizes the principle of geostatistics so that later it will get a better subsurface picture with high resolution. The stages in conducting this stochastic inversion technique are as follows, (i) sensitivity analysis, (ii) well to seismic tie, (iii) picking horizon, (iv) picking fault, (v) fault modeling, (vi) pillar gridding, ( vii) making time structure maps, (viii) scale up well logs, (ix) trend modeling, (x) variogram analysis, (xi) stochastic seismic inversion (SSI). In the process of well to seismic tie, statistical wavelets are used because they can produce good correlation values. Then, the stochastic seismic inversion results show that the reservoir in the study area is a reservoir with tight sandstone lithology which has a low porosity value and a value of High acoustic impedance ranging from 30,000 to 40,000 ft /s*g/cc.

Identification of Clay Mineral Content Using Spectral Gamma Ray on Y1 Well in Karawang Area, West Java, Indonesia. Rahmat Catur Wibowo; Alia Puja Pertiwi; Suci Kurniati
Journal of Geoscience, Engineering, Environment, and Technology Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2020.5.3.4504

Northwest Java Basin (NWJB) is one of the proven hydrocarbon basins in Indonesia. The scope of this paper will focus onthe shales and sandstone interval within Y1 well in Karawang area, NWJB, Indonesia.A cored interval from Y1 well was chosen for an investigation of the clay minerology for the gamma-ray activity and with the purpose of determining how the Spectral Natural Gamma (SNG) log could be used as an indicator of source rock and reservoir quality. The Th/U as a redox indicator is used to assert that the shales are of anoxic conditions of shallow marine environments. Despite the relatively high insoluble Th values (60-74.15) ppm, the presence of U in substantial amounts, which only occurs in reducing conditions where it is preserved as a lower insoluble valence (U4+) explains for the low Th/U values ranging between (5.8-7.1) ppm/ppm. The overall Th/U value of the evaluated shales remain less than 25, where Th/U <25 is suggestive of marine sediments, whereas Th/U <4 is indicative of marine black shales of reducing conditions. Although no linear relationship was found between clay content and K, Th, or U, the K content characteristic three discrete reservoir characteristic (RC). The RC-I has predicted a matrix-supported texture with the highest K signal, illite and illitised kaolinite are roughly equal in importance as source of K. The RC-II has predicted a grain-supported texture with intermediate K content. K-feldspar, mica and illite as the main sources. The RC-III has predicted have a low K content with grain-supported texture and most of the K is hosted in feldspar. Overall, the laboratory measurements appear to be applicable to the log data, and, using SEM or XRD, the detail facies subdivision can be extended throughout the source rock and reservoir section based on the SNG log.

Analysis of the Surface Subsidence of Porong and Surrounding Area, East Java, Indonesia based on Interferometric Satellite Aperture Radar (InSAR) Data. Indra Arifianto; Rahmat Catur Wibowo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2020.5.4.5149

Since 2006, the mud volcano erupted in the Porong area due to wellbore failure triggered by an earthquake (2006) epicenter in the Jogjakarta area. The mud volcano buried several villages with mud and continued erupted until today. Based on the InSAR data, it can be seen that the subsidence is still happening near the dam area and another area that is not related to mud volcano eruption such as the production of two gas fields in the Porong area. Moreover, the Porong area is flat and low, less than 4 meters above sea level. The analysis shows that the subsidence rate in this area is up to 0.5 m/yr. If this subsidence is continuing, the city can be sinking and flooding during the rainy season. The prediction result from this method is about 10 years more and 36 years since in 2006 based on the mudflow rate method.

Total Organic Carbon (TOC) Value Prediction in Source Rock Potential at North East Java Basin, Indonesia Paulus Leonardo Manurung; Rahmat Catur Wibowo; Ordas Dewanto
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2021.6.3.6644

This research aims to determine the potential of the source rock in the Kujung and Cepu Formations in the North East Java Basin, using Total Organic Carbon (TOC). TOC is calculated using the Passey method. The Passey method is used by overlaying the sonic log and the resistivity log and determining the baseline to get the separation of Δlog resistivity, which is then used to predict the TOC log by including the LOM (Level of Organic Maturity) variable obtained from the data of vitrinite reflectance. After the TOC log value is obtained, a correlation is made with the TOC core value. The prediction result of TOC log in a PM-1 well is 2.16%, which means it has excellent quality. The prediction of TOC log in a PM-2 well is worth 2.68%, which means it has excellent quality. The correlation value between the TOC log and the TOC core of the PM-1 well is 0.67, which means the correlation is strong. In PM-2 well, the correlation between the TOC log and TOC core is 0.92, which means that the correlation is robust.

Peningkatan Partisipasi Masayarakat pada Studi Pemetaan Partisipatif dalam Pembuatan Jalur Evakuasi Bencana Tsunami di Desa Wisata Pagar Jaya Rahmat Catur Wibowo; Karyanto Karyanto; Ahmad Zaenudin; Muh Sarkowi
Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Vol 4 No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jss.v4i1.172

Desa wisata Pagar Jaya memiliki beberapa obyek geowisata yang sangat menarik untuk dikunjungi seperti: Dinding Dasit, Pantai T. Indah, Pantai T. Hantu, dan Batu Wayang. Semua obyek geowisata tersebut berada di area pesisir dan sangat rentan terhadap ancaman bencana tsunami. Nilai penting dari proses partisipatif dalam kajian risiko bencana adalah mewadahi masyarakat dalam mengambil keputusan dan merumuskan tindakan prioritas pengurangan risiko bencana. Tujuan dari pengabdian ini adalah: memetakan kondisi eksisting obyek geowisata Dinding Dasit, Teluk Indah, Teluk Hantu, dan Batu Wayang berbasis geospasial, mengedukasi masyarakat akan prinsip-prinsip mitigasi bencana tsunami, dan mengintegrasikan data geospasial dan nonspasial dari kelompok masyarakat dalam pembuatan jalur evakuasi bencana tsunami di Desa Wisata Pagar Jaya. Kelompok masyarakat yang tergabung dalam Kelompok Sadar Wisata (Pokdarwis) Desa Wisata Pagar Jaya merupakan subjek utama dalam proses pemetaan partisipatif. Proses pemetaan melalui tahap Focus Group Discussion dan in-depth interview berkaitan dengan risiko bencana dan jalur evakuasi. Sistem Informasi Geografis kemudian mentransformasikan hasil pemetaan partsipatif dalam bentuk digital. Hasil dari penelitian ini adalah peta partisipatif jalur evakuasi untuk bencana tsunami di Desa Pagar Jaya yang secara geografis berada di pesisir selatan Pulau Sumatera.

Studi Pemetaan Partisipatif Melalui Pemberdayaan Masyarakat Lokal Dalam Pembuatan Peta Geowisata Berbasis Konservasi Sumber Mata Air Guna Mewujudkan Desa Sukaraja Sebagai Destinasi Wisata Utama di Kabupaten Tanggamus Rahmat Catur Wibowo; Muh Sarkowi
Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Vol 6 No 1 (2022)
Publisher : Lembaga Penelitian dan Pengabdian Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jss.v6i1.327

Kawasan mata air Way Bekhak di Desa Sukaraja Kecamatan Gunung Alip Kabupaten Tanggamus memiliki potensi sebagai tujuan geowisata. Beberapa upaya yang telah dilakukan untuk memetakan kawasan mata air di wilayah hutan lindung Tanggamus, akan tetapi sangat sedikit kegiatan tersebut berhasil. Sifat hidrogeologi mata air yang ada di kawasan hutan lindung yang dekat dengan permukiman warga menyebabkannya sangat rentan terhadap gangguan atau kerusakan. Mengingat pentingnya keberadaan dan peranan ekosistem mata air bagi daerah hutan lindung sebagai kawasan geowisata, maka penataan dan pengelolaan mata air yang sesuai dengan sifat dan karakteristiknya sangat perlu dilakukan. Dalam hal ini, salah satu upaya yang diperlukan adalah kegiatan pemetaan mata air Way Bekhak untuk keperluan geowisata. Untuk mendukung kegiatan tersebut, diperlukan kegiatan sosialisasi, pelatihan rehabilitasi hutan yang dapat dilakukan oleh masyarakat agar dapat tumbuh dan berkembang sesuai yang diharapkan, sehingga kawasan ini dapat dijadikan sebagai tempat wisata yang efektif dan berkelanjutan. Metode yang digunakan dalam rangka memetakan kawasan ekosistem mata air Way Bekhak bersifat deskriptif dengan pendekatan partisipatif yaitu melalui pendekatan sosialisasi, penyuluhan dan pembentukan kelompok binaan, penanaman, hingga pemeliharaan. Hasil yang dicapai pada pengabdian ini berupa rencana pengembangan kawasan mata air Way Bekhak, terwujudnya penguatan kapasitas kelembagaan, sehingga masyarakat mampu swamandiri di berbagai bidang.

PEMETAAN PERTANIAN DENGAN DRONE DI PEKON DADAPAN KECAMATAN SUMBEREJO KABUPATEN TANGGAMUS LAMPUNG Rahmat Catur Wibowo
Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Vol 4 No 3 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jss.v4i3.230

Petani saat ini harus memiliki strategi yang revolusioner untuk meningkatkan produksi pertanian. Salah satu solusi untuk itu adalah pemetaan dan desain yang optimal dengan teknologi tinggi yang berbiaya murah. Penggunaan Drone (pesawat tanpa awak) atau UAV (Unmanned Aerial Vehicle) menjadi bagian dari solusi tersebut. Teknologi drone akan menjadikan pertanian menjadi industri yang berteknologi tinggi dengan perencanaan dan strategi berdasarkan data saat itu juga (real time). Beberapa manfaat yang diberikan ketika petani menggunakan drone adalah analisis tanah dan lahan, strategi penanaman, penyemprotan pestisida yang efektif, pemantauan padi atau lahan, desain irigasi, dan tingkat kesehatan padi. Pekon Dadapan Kecamatan Sumberejo, Kabupaten Tanggamus menjadi desa Mitra dalam penerapan teknologi Drone untuk pemetaan kesehatan tanaman padi. Pada Program Kemitraan Masyarakat (PKM) ini diberikan materi dengan presentasi, demo, pelatihan berupa praktek pengoperasian drone dan pemberian Drone untuk Mitra. Untuk mengontrol keberhasilan dan kemajuan kegiatan, dilakukan monitoring dan evaluasi. Hasil rata-rata dari evaluasi awal mengenai tingkat pengetahuan sasaran terhadap materi penyuluhan adalah 5%. Hasil evaluasi akhir rata-rata pengetahuan Mitra tentang pemetaan pertanian dengan drone adalah 65% Terjadi peningkatan pengetahuan petani sebesar 60%. Kegiatan PKM di pekon Dadapan Kecamatan Sumberejo membawa peningkatan yang siginifikan tentang pengetahuan drone untuk pemetaan pertanian.

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

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

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.

ANALISIS PETROFISIKA UNTUK MENENTUKAN OIL-WATER CONTACT PADA FORMASI TALANGAKAR, LAPANGAN “FBT”, CEKUNGAN SUMATRA SELATAN Febrina Bunga Tarigan; Ordas Dewanto; Karyanto Karyanto; Rahmat Catur Wibowo; Andika Widyasari
Jurnal Geofisika Eksplorasi Vol 5, No 1 (2019)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v5i1.20

In conducting petrophysics analysis, there are many methods on each property. Therefore, it is necessary to determine the exact method on each petrophysical property suitable for application in the field of research in order to avoid irregularities at the time of interpretation. The petrophysical property consists of volume shale, porosity, water saturation, etc. This research used six well data named FBT01, FBT02, FBT03, FBT04, FBT05, and FBT06 and also assisted with core data contained in FBT03. Core data used as a reference in petrophysical analysis because it was considered to have represented or closed to the actual reservoir conditions in the field. The area in this research was in Talangakar Formation, "FBT" Field, South Sumatra Basin. The most suited volume shale method for “FBT” field condition was gamma ray-neutron-density method by seeing its photo core and lithology. As for the effective porosity, the most suited method for the field was neutron-density-sonic method by its core. Oil-water contact was useful to determine the hydrocarbon reserves. Oil-water contact was obtained at a depth of 2277.5 feet on FBT01, 2226.5 feet on FBT02, 2312.5 feet on FBT03, 2331 feet on FBT04, 2296 feet on FBT05, and 2283.5 feet on FBT06. The oil-water contact depth differences at Talangakar formation in FBT field caused by structure in subsurface.

Co-Authors Adelyra, Sabrina Adhani, Alika Tabriza Adhi Wibowo Ahmad Zaelani Ahmad Zaenudin Ahmad Zaenudin Aldika Rizkiano Aldika Rizkiano Alia Puja Pertiwi Alimuddin Muchtar Andika Widyasari ANDRI KURNIAWAN Anggraini, Serly Annur Istikomah Arianto, Khalila Wardah Aryka Claudia Eka Putri Aufar Farrell Khamada Bagus Sapto Mulyanto Bagus Sapto Mulyatno Bagus Sapto Mulyatno Bambang Irawan Bulan, Novita Putri Damayanti, Elok Dani, Ilham Destawan, Ridho Dewi Wijayanti Dewi Wijayanti Diah Ega Safitri Dianti, Amelia Dikpride Despa Ditha Arlinsky Ar Egi Ramdhani 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 Ikram Maulia 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 Khansa, M. Roid Billy Khotimah, Ayu Khousnul Kumalasari, Isti Nur Kurniasih, Aulia Lola Anjelika Lumbantoruan, Irma Nurliza Luthfi Rahmawati Mazzaluna, Haidar Prida Meilinda, Alda Mirnawati Mirnawati Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muh Sarkowi Muhammad Budisatya Wiranatanagara Muhammad Budzar Alghifarry Muhammad Sarkowi Mulyanto, Bagus Sapto Mulyatno, Bagus S Mulyatno, Bagus Sapto Nanda Hanyfa Maulida Nandi Haerudin Nandi Haerudin Nasik, Ahmad Nurfaidah, Hayu Nurlaili, Jesica Nurrochman, Arsy Octavia Melani Ordas Dewanto Ordas Dewanto Ordas Dewanto Ordas Dewanto Ordas Dewanto Ordas Dewanto Ordas Dewanto Ordas Dewanto, Ordas 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 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 Yazid Pangaloan Lubis Yogi, Ida Bagus Suananda

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