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All Journal Bulletin of Scientific Contribution : Geology Buletin Sumber Daya Geologi Journal of Geosciences and Applied Geology
Aldrin Ramadian
Fakultas Teknik Geologi, Universitas Padjadjaran
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (976.501 KB)

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.    
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.
LAND MOVEMENT VULNERABILITY ZONING IN THE HILLY AREA OF NORTHERN CILACAP, CENTRAL JAVA Nurfadli, Eza; Sukiyah, Emi; Gani, Reza Mohammad Ganjar; Ramadian, Aldrin
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.57140

Abstract

The northern part of Cilacap has an area with hilly morphology with slopes that are relatively gentle to steep. The geological setting in this region is quite complex, the combination of tectonics and the physical properties of the rocks means that this region is strongly deformed. This has an impact on areas prone to landslides as one of land movement types. To what extent can this area be classified based on the vulnerability of its land to landslides is the problem be studied. There are five aspects used in this research, namely rainfall, rock type, slope, land cover and soil type. The multi-aspect overlay method is used to determine the spatial distribution of land movement-prone zones. Geographic Information System-based software support makes the data analysis process easier. Based on the results of the spatial analysis of five aspects, it was concluded that the North Cilacap area could be grouped into 3 land movement vulnerability zones, namely the low vulnerability zone with a score of 8-17, the medium vulnerability zone with a score of 18-27, and the high vulnerability zone with a score of 28-37. The complex tectonic order is the main controller of land movement events in this region.
Stable Slope Design Based On Limit Equlibrium Method (Lem) And Finite Element Method (Fem) At Pit X, Lahat, South Sumatra BAGASKORO, MUHAMAD NUR; Irvan Shopian, Raden; Ramadian, Aldrin
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i3.53006

Abstract

Coal mining process using open pit mining method is closely related to slope stability. A slope whose stability is disturbed will have a higher potential for landslides. The slope stability analysis in this research is conducted by Limit Equilibrium Method (LEM) with the calculation of Morgenstern-pice slice method and Finite Element Method (FEM) with the calculation of Shear Strength Reduction. The highwall simulation was modeled with a Bench height of 10 meters, Bench width of 6.5 meters and bench tilt angle varying between 30°, 45°, 60° and groundwater condition using steady state FEA. From the results of the LEM analysis on the highwall with a bench tilt angle of 30 °, 45 °, 60 ° has a safety factor value of 1.005; 0.76; 0.584. While the results of the FEM analysis on the highwall with a bench tilt angle of 30 °, 45 °, 60 ° have a Strength Reduction Factor value of 0.98; 0.72; 0.57. Comparison of the safety factor values of the two methods has an average difference of 1-2%. This is because the FEM takes into account the stress-strain in the material which describes how the material behaves. The stable slope design based on LEM is a highwall slope with a Bench slope angle of 22° which has a safety factor value of 1.478 and based on FEM is a highwall slope with a Bench slope angle of 22° which has a Strength Reduction Factor value of 1.42.
Geophysical Approach And Geochemistry Correlated To Discover Underground Water Flow Indicator To Mud Volcano In Quarter Volcanic System Ridwan, Pandji; Fachrudin, Kurnia Arfiansyah; Ramadian, Aldrin; Wijayanti, Kemala
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. 
Tectonic Activity Response Based on Geomorphic Index In Pasirmunjul, Sukatani, Purwakarta Regency, West Java Pradifta, Alif; Ismawan, Ismawan; Ramadian, Aldrin
Journal of Geological Sciences and Applied Geology Vol 6, No 1 (2022): 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.v6i1.45227

Abstract

The study area administratively located in Sukatani sub-district, Purwakarta Regency, West Java. This study is aim to determine the level of tectonic activity in the study area using a quantitative geomorphological approach. The geomorphic indices that used in this research are the Mountain Front Sinusity (SMF), Ratio of valley floor width to valley height (Vf), Hipsometric Integral (HI), Drainage Basin Shape (BS), and Asymmetry Factor (AF). Then, these parameters of geomorphic index, are included in the calculation of the Relative Tectonic Activity Index (IATR) which is show the distribution of tectonic activity levels in the study area. The results of the analysis Relative Tectonic Activity Index (IATR) show that the study area is divided into 3 classes of tectonic activity, namely class 2 (high), class 3 (medium), and class 4 (low). Class 2 occupies about 19.5% of the study area with an area of 7.6 km2 which is spread over the western part of the study area. Class 3 occupies about 79.8% of the study area with an area of 31.4 km2 which is spread dominantly in the study area. While class 4 (low), which occupies about 0.7% of the study area with an area of 0.28 km2 which is spread in the northern part of the research area. In general, the study area has a fairly balanced between level of tectonic activity with an erosion activity, but in the western part of the study area tended to be more dominated with tectonic activity than the erosion activity, which was indicated due to the influence of the structure in the area and caused a catastrophic ground motion in surrounding area.
TEKTONIK BATUAN PRA-TERSIER JAWA BARAT -, Iyan Haryanto; -, Aldrin Ramadian; -, Faisal Helmi
Bulletin of Scientific Contribution Vol 7, No 2 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (754.564 KB) | DOI: 10.24198/bsc.v7i2.8235

Abstract

The Pre-Tertiary Melange is the oldest rocks outcrop that found in Ciletuh area. Stratigraphically, this mélange is basement rock that overlaid unconformity by Tertiary sedimentary rocks, i.e. Ciletuh and Jampang FormationThe outcropping mechanism of Pre-Tertiary rock in this area due to up-tilting, thrusting and folding that followed by sliding. The product of sliding is represented by a elongate scarp toward the sea..
KARAKTERISTIK GEOKIMIA BATUAN INDUK FORMASI WALAT, SUKABUMI, JAWA BARAT Ilmi, Nisa Nurul; Ramadian, Aldrin
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 | 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.
Co-Authors BAGASKORO, MUHAMAD NUR Emi Sukiyah Fachrudin, Kurnia Arfiansyah Faisal Helmi Irvan Shopian, Raden Ismawan Ismawan, Ismawan Iyan Haryanto Kemala Wijayanti, Kemala Nisa Nurul Ilmi Nurfadli, Eza Pradifta, Alif Reza Mohammad Ganjar Gani Ridwan, Pandji