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All Journal JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) BULLETIN OF THE MARINE GEOLOGY Jurnal Rekayasa Lingkungan Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Imam Setiadi
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Agriculture, Biological Sciences & Forestry Chemistry Earth & Planetary Sciences Energy Environmental Science

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Journal : Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)

 1 
Basement Configuration and Delineation of Banyumas Sub-Basin Based On Gravity Data Analysis Imam Setiadi
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 2 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i2.237

Abstract

Many oil and gas seepages occurred on thesurface of Banyumas Basin as one of the active petroleum systems manifestation. Geological complexity of this basin makes it difficult to discover the oil and gas reserves unlike the basin of the East and West Java area. The aims of this research are to determine the subsurface geological structure patterns, distribution of sedimentary sub-basin, and  basement configuration. Gravity data of Banyumas and surrounded area is analysed by using spectral analysis, moving average filter, and 2D forward modelling. The gravity data delineation analysis resulting about six sedimentary sub basins with depocentre of 5.5 km positioned at Purbalingga and Karangkobar Sub-basin. The structural pattern derived from residual gravity anomaly shows a relative southeast-northwest strike-slip fault and an east-west trend basement high pattern. Concerning from the oil and gas seepage presence in the study area, sufficient sedimentary rock thickness, and supporting petroleum system, this region is considered as an attractive subbasin for further petroleum prospect investigation. Keywords : gravity analysis, sedimentary basin, spectral analysis, moving average, 2D modelling
Pola Struktur dan Konfigurasi Geologi Bawah Permukaan Cekungan Jawa Barat Utara berdasarkan Analisis Gayaberat Imam Setiadi; Achmad Wahyu Pratama
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 2 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i2.345

Abstract

North West Java Basin consists of several subbasins formed by a complex tectonic processes. Determining subbasin patterns and geological subsurface structure sometimes difficult to identified through geological qualitative analysis, especially in a minimum full rock outcrop condition. One of the geophysical methods that can be used to know the subbasin spreading and subsurface geological configuration is gravity method. The purpose of this research is examining the distribution pattern of sedimentary subbasin, structure patterns and subsurface geological configuration based on spectral analysis, two dimension, and three dimension gravity modeling. The result of spectral analysis shows that the average basement depth in North West Java basin is 3.3 Km. Based on the results of residual anomalies and 3D inversion shows that there are 5 subbasins; Bekasi Subbasin, Rengasdengklok Subbasin, Cikampek Subbasin, Subang Subbasin, and Majalengka Subbasin. The 2D modeling and the second vertical derivative (SVD) analysis result that the subbasin structure are controlled by some faults which forming horst-graben structures. Keywords : gravity, spectral analysis, second vertical derivative, gravity modelling, Northwest Java Basin
Kompleks Batuan Ultramafik Meratus sebagai bagian dari Ofiolit Kerak Samudera Ditinjau dari Aspek Geomagnetik dan Gaya Berat Budi Setyanta; Imam Setiadi
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 6 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i6.374

Abstract

Geomagnetic and gravity analyses were carried out in the Banjarmasin quadrangle, South Kalimantan. Qualitative analysis of gravity anomaly show that ophiolite is located in the central quadrangle with anomaly values between 550 µms-2 and 750 µms-2 trending southwest-northeast.Geomagnetic qualitative analysis presents high  geomagnetic anomaly part values between 0 nT and 450 nT in the southern area, while low anomaly between -750 nT to 0 nT, generally in northern part of the sheet. Quantitative analysis was done by making subsurface geological profiles model AB, CD, and EF. Ophiolite rock from the gravity modeling have density between 2.7 gr/cc and 2.9 gr/cc. This is probably caused by fragmentation process which affect the basement oceanic rock mix by Pre-Cretaceous rock such as chert, metamorphic and carbonat rocks, accordingly this reduce the rock density, while geomagnetic model have susceptibility of 0.15 SI. Ophiolite rock was interpreted as oceanic crust bolder that overlay on the granitic crust which has less magnetization. This shows a subduction model which cause oceanic crust uplifted and laid on the upper of granitic crust and than revealed as Bobaris and Manjam ophiolite belts. Keywords : Geomagnetic, gravity, ophiolite, oceanic crust
Co-Authors Achmad Wahyu Pratama Akroma Hidayatika Budi Setyanta Budy Wiryawan Dinda Rita K. Hartaja Hayu Nurfaidah Marjiyono Marjiyono Muh. Sarkowi Muhammad Sarkowi Oman Sulaeman Ordas Dewanto Rahmi Mulyasari Restu Ningsih Riza Rahardiawan Said Muhammad Rasidin Tumpal Bernhard Nainggolan