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All Journal Journal of Oceanography BULLETIN OF THE MARINE GEOLOGY
Riza Rahardiawan
Kementerian ESDM
Earth & Planetary Sciences

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INTERPRETASI LAPISAN SEDIMEN DASAR LAUT DI PERAIRAN UTARA JAWA (LEMBAR PETA 1310) MENGGUNAKAN SUB BOTTOM PROFILE Stephanie, Stephanie; Widada, Sugeng; Rahardiawan, Riza
Journal of Oceanography Vol 3, No 4 (2014)
Publisher : Program Studi Oseanografi, Jurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (611.847 KB)

Abstract

Sedimen dasar laut dapat mendeskripsikan kondisi geologi yang terjadi di masa lampau hingga masa kini. Penelitian ini bertujuan untuk mengetahui kondisi lapisan-lapisan sedimen dasar laut Perairan Utara Jawa (Lembar Peta 1310) berdasarkan profil penampang seismik Sub Bottom Profile. Pengambilan data lapangan dilakukan pada bulan September 2013 menggunakan kapal Geomarin I milik Pusat Penelitian dan Pengembangan Geologi Kelautan, Kementerian Energi dan Sumber Daya Mineral,analisa sedimen dilkukan pada bulan November, 2013 di Laboratorium Geologi P3GL, Cirebon. Metode penelitian yang digunakan bersifat deskriptif denganmateri yang diteliti berupa data pemeruman dasar laut, sampel sedimen dasar dan data rekaman seismik Sub Bottom Profile. Hasil interpretasi menunjukansedimen dasar pada daerah penelitian dkelompokan dalam 4 lapisan pengendapan yang terdiri dari Unit 1 adalah lapisan terluar sedimen berumur resen dengan fraksi butir halus. Unit 2 merupakan bidang batas sekuen erosional truncation yang mengidentifikasikan terjadinya erosi.Unit 3 adalah lapisan sedimen yang sebagian telah terkikis karna berbatasan dengan bidang erosi dan basemen akustik.Unit 4 adalah lapisan akustik basemen yang telah mengalami deformasi.Berdasarkan hasil analisa sampel sedimen dasar pada daerah penelitian berupa lempung dan lanau pasiran.
GRAVITY MODELING OF SUBSURFACE STRUCTURES AND RESERVOIR CHARACTERIZATION USING SEISMIC INVERSION IN THE NIAS BASIN Wibowo, Ramadhana; Setiadi, Imam; Firdaus, Yulinar; Rahardiawan, Riza
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 2 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.2.2024.890

Abstract

The development of interpretation techniques opens new exploration opportunities in the forearc basins of western Indonesia, such as the Nias Basin which show signs of oil and gas seepage. Gravity and seismic inversion analysis were used to look into the Nias Basin in order to evaluate its subsurface structure, the location of sedimentary sub-basins, and the possible presence of hydrocarbon reservoirs. After filtering the data for the Complete Bouguer Anomaly (CBA), a residual anomaly was obtained. This allowed for the quantitative interpretation of structures below the surface using 2D gravity forward modelling. Seismic and well data interpretation includes sensitivity analysis, a well-seismic tie, picking horizons, and acoustic impedance (AI) inversion. The residual gravity anomaly reveals eight sub-basin patterns spread out in the Nias Basin with a relative continuity direction of northwest-southeast following the lineaments of basement highs. The subsurface geological model identified four rock formations. From deepest to shallowest, these units are metamorphic bedrock (2.7 g/cc), Lelematua Formation (2.5 g/cc), Gomo Formation (2.4 g/cc), and Gunungsitoli Formation with an overlying alluvium (2.25 g/cc). Interpretation of well and seismic suggests a target zone at a 2,017 – 2,101 meters depth. Using a model-based hard constraint for AI inversion in this zone indicates possible carbonate reservoirs. Based on sensitivity analysis with an interval of 34,000 - 47,000 (ft/s)*(g/cc), an AI cutoff value of more than 34,000 (ft/s)*(g/cc) was obtained. The carbonate is estimated to be a tight carbonate in the limestone of the Gomo Formation.
Co-Authors Imam Setiadi, Imam Stephanie Stephanie Sugeng Widada Wibowo, Ramadhana Yulinar Firdaus, Yulinar