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All Journal Buletin Sumber Daya Geologi Journal of Geosciences and Applied Geology
Aldrin Ramadian
Fakultas Teknik Geologi, Universitas Padjadjaran
Earth & Planetary Sciences Education Energy Engineering Environmental Science

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KARAKTERISTIK GEOKIMIA BATUAN INDUK FORMASI WALAT, SUKABUMI, JAWA BARAT Nisa Nurul Ilmi; Aldrin Ramadian
Buletin Sumber Daya Geologi Vol. 13 No. 1 (2018): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (976.501 KB) | DOI: 10.47599/bsdg.v13i1.60

Abstract

Kajian karakteristik geokimia batuan induk Formasi Walat di Sukabumi, Jawa Barat merupakan suatu langkah untuk mendapatkan informasi mengenai sistem minyak dan gas bumi yang ada. Lebih lanjut lagi, kajian ini juga diharapkan dapat mengungkap kesamaan sistem minyak dan gas bumi di daerah studi, dengan potensi hidrokarbon terbukti di Cekungan Jawabarat Utara. Kekayaan material organik, tingkat kematangan, serta tipe hidrokarbon yang dihasilkan merupakan parameter penting yang menunjukkan karakter batuan induk secara geokimia. Sistematika pemercontohan singkapan Formasi Walat yang diyakini berpotensi sebagai batuan induk, dianalisis ke laboratorium untuk penyelidikan karakteristik geokimia. Sebanyak tujuh belas percontoh terpilih, dan selanjutnya dianalisis karakter geokimianya melalui parameter Total Organic Carbon dan Rock Eval Pyrolysis (nilai S1, S2, dan S3 beserta turunannya). Berdasarkan tingkat kematangan, semua percontoh berada pada tingkatan matang hingga matang akhir dengan kualitas kerogen tipe III yang menghasilkan gas. Hasil penelitian menunjukkan bahwa Formasi Walat memiliki karakter batuan induk dengan kekayaan sedang hingga sangat baik, dan memiliki potensi untuk menghasilkan hidrokarbon jenis gas. Berdasarkan penemuan sumber batuan induk potensial di formasi ini, maka dapat dikatakan bahwa di daerah studi terdapat sistem minyak dan gas bumi yang setara dengan Cekungan Jawabarat Utara, sehingga eksplorasi migas pada wilayah selatan Jawa Barat menjadi menarik.
Geophysical Approach And Geochemistry Correlated To Discover Underground Water Flow Indicator To Mud Volcano In Quarter Volcanic System Pandji Ridwan; Kurnia Arfiansyah Fachrudin; Aldrin Ramadian; Kemala Wijayanti
Journal of Geological Sciences and Applied Geology Vol 4, No 3 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i3.32220

Abstract

No less than 108 million meter3 of hot mud has been spread out from the earth since the burst first occurred in Porong, Sidoarjo at May 29th, 2006 until this day. This mud has covered the area for more than 717.027 ha with inundation that reaches many meters deep. If a close attention is being paid, 70% contain of the mud is water. Because of that, water volumes which have been produced is no less than 75 million m3.  Therefore, information of subsurface geological data of the region around the burst site is needed to find out where the source of water came from. This study is meant to get a subsurface image of Porong so that a subsurface water channel that supplies water to the centre of mud burst can be found. Geophysical data, which is in the form of gravity method, Audio Magnetotelluric (AMT), and Magnetotelluric are correlated with geochemical study of elements of the mud. Pb, Zn, Mn, Ag, Cd, Sb, Au, Se, and Hg elements which the hot mud have is  indication of hydrothermal influence at 100°C that come from the quarter volcanic system around the mud source such as Pananggungan Mountain and Arjuna Mountain.  Not only that, result of measurement, gravity interpretation in form of Bouger anomaly, AMT, and MT data show three lineament structures in NE – SW direction in Porong, Sidoarjo. One of them extends from Watukosek Village in Pananggungan Mountain to the mud lake of Sidoarjo. This lineament is interpreted as a fault zone with 0.2 – 0.7 km deep in Watukosek Village and even gets deeper in the mud lake area (1.5 – 3 km deep). The Fault is a permeable zone which acts as the subsurface water channel. This channel is interpreted as the way of water flow, so the mud burst still continuous until this day. 
Co-Authors Kemala Wijayanti Kurnia Arfiansyah Fachrudin Nisa Nurul Ilmi Pandji Ridwan