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All Journal Bulletin of Scientific Contribution : Geology Buletin Sumber Daya Geologi
Reza Mohammad Ganjar Gani
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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PEMODELAN GEOLOGI DAN ESTIMASI SUMBER DAYA BATUBARA DI PIT “HMG”, TAMBANG BATUBARA BANKO BARAT, SUMATRA SELATAN: GEOLOGICAL MODELLING AND COAL RESOURCE ESTIMATION IN THE “HMG” PIT, WEST BANKO COAL MINE, SOUTH SUMATRA Adithya Ramadhani Hasibuan; Juniarto, Reinaldi; Nurdrajat; Reza Mohammad Ganjar Gani; Dicky Muslim; M. Dwiki Satrio
Buletin Sumber Daya Geologi Vol. 15 No. 3 (2020): 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.v15i3.308

Abstract

Indonesia is a country that has a lot of coal deposits, and one of the largest deposits is in Sumatra Island. The Bukit Asam coal mine has had a long history beginning with the Dutch colonial period. Administratively, location of the studied area is located in the area of Bukit Asam coal mine, Tanjung Enim area, Muara Enim Regency, South Sumatra Province. This paper provides the 2D and 3D geological modelling to estimate coal resources in the “HMG” PIT of West Banko Coal Mine. Forty-eight exploratory drill holes data from PT Bukit Asam were used in this study. There were reanalysed and reinterpreted to identify coal characteristics, correlate coal seams, and compile to create subsurface geological models. In an effort to determine coal resources in this area, there were some analytical techniques (criteria or parameter), including geological complexity analysis, coal quality distribution analysis, subsurface mapping to observe the geometry of coal seam distribution and making geological models from the results of drilling activities. The studied objects are seams A1, A2, B1, B2, and C with rank of high volatile B bituminous based on the ASTM Classification. The coal seams distribution shows relatively southeast-northwest trends. Resources classification or estimation in this paper is based on SNI 5015 : 2011, in which the study area is included in the geological complexity of simple geological groups with the distance of inferred resource information 1,000<X≤ 1,500m, designated 500<X≤1,000m, and measured X≤500m. From geological modelling and the Circular Method, estimated coal seam A1 resource is 28,543,893 tons, A2 seam is 31,199,799 tons, seam B1 is 38,638,462 tons, seam B2 is 15,790,222 tons, and seam C is 40,913,153 tons. The total coal resources are 155,085,529 tons.
EVALUASI BATUAN INDUK DAN PEMODELAN KEMATANGAN BATUAN INDUK PADA BLOK "F", CEKUNGAN JAWA BARAT UTARA Muhammad Farhan Darmawan; Reza Mohammad Ganjar Gani; Nisa Nurul Ilmi; Ahmad Husaeni; Firman Ardiansyah Bumolo
Bulletin of Scientific Contribution: GEOLOGY Vol 19, No 2 (2021): Bulletins of Scientific Contribution : Geology
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc geology.v19i2.34464

Abstract

Penelitian dilakukan di Sub-Cekungan Jatibarang, Cekungan Jawa Barat Utara dengan menggunakan metode geokimia. Analisis dilakukan untuk mengetahui karakteristik batuan induk, biomarker, potensi batuan induk, sejarah pemendaman dan korelasi minyak bumi-batuan induk pada sumur D22, D26, dan D29. Hasil analisis menunjukan bahwa karakteristik geokimia pada Formasi Jatibarang dan Talang Akar dari masingmasing sumur memiliki nilai TOC, S1, S2, dan PY yang cukup baik dengan tipe kerogen II-III sehingga menghasilkan hidrokarbon dengan jenis minyak dan gas bumi serta memiliki tingkat kematangan yang matang. Potensi Formasi Jatibarang dan Talang Akar sebagai batuan induk termasuk kedalam klasifikasi batuan induk efektif, Formasi Baturaja dan Main Upper Cibulakan termasuk batuan induk potensial, dan Formasi Parigi termasuk batuan induk memungkinkan. Proses pengendapan pada daerah penelitian terjadi secara terus menerus karena pada Formasi Jatibarang tidak ditemukan suatu unconformity berupa erosional maupun non-deposisional. Korelasi minyak-batuan induk pada Formasi Jatibarang menunjukan minyak yang ada pada Formasi Jatibarang berasal dari batuan induk yang ada di Formasi Jatibarang sedangkan minyak yang ada pada Formasi Talang Akar berasal dari batuan induk yang ada di Formasi Talang Akar.
PERANAN ASPEK STRATIGRAFI DAN GEOLOGI DALAM MENGKAJI POTENSI GERAKAN TANAH DI KECAMATAN PELABUHAN RATU, KABUPATEN SUKABUMI Yusi Firmansyah; Reza Mohammad Ganjar Gani; Djadjang Djedi Setiadi; Adycipta Adycipta
Bulletin of Scientific Contribution: GEOLOGY Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (579.928 KB) | DOI: 10.24198/bsc geology.v15i1.11995

Abstract

ABSTRAKPenelitian ini dilakukan untuk menilai potensi gerakan tanah yang mengacu kepada aspek-aspek geologi yang berkembang pada daerah penelitian. Secara astronomis daerah penelitian terletak pada 7o 0’ 3.15” – 7o 5’ 26.89” LS dan 106o 37’ 43.84” – 106o 43’ 10.28” BT, dengan dimensi 10x10 Km. Aspek geologi yang digunakan untuk mengidentifikasi pergerakan tanah antara lain geomorfologi, stratigrafi dan geologi struktur, selain dari ketiga aspek tersebut kami juga mempertimbangkan aspek tutupan lahan sebagai pemicu pergerakan tanah. Dalam menganalisa potensi pergerakan tanah metoda yang digunakan adalah skoring, dimana variabel yang akan digunakan diberi nilai dan dimasukan kedalam kelas-kelas. Dari hasil analisis potensi gerakan tanah, dapat disimpulkan bahwa daerah penelitian didominasi oleh zona stabil hingga kurang stabil. Sedangkan untuk daerah yang dianggap tidak stabil berada dibeberapa titik dari lereng sungai cimandiri yang juga merupakan zona sesar cimandiri dan sesar hegarmanah, dengan litologi batubeku andesit, batugamping dan alluvium.  Kata kunci : Longsor, Pergerakan Tanah, Pemetaan Geologi ABSTRACTThis study was conducted to assess the potential for ground movement, which refers to the geologic aspects of developing the research area. In astronomical research area lies in 7o 0’ 3.15” – 7o 5’ 26.89” LS dan 106o 37’ 43.84” – 106o 43’ 10.28” BT, with dimensions of 10x10 km. Geological aspects are used to identify the movement of the ground, among others, geomorphology, stratigraphy and geologic structure, apart from these three aspects we also take into consideration aspects of land cover as a trigger for ground movement. In analyzing the potential for ground movement is scoring method used, where the variables to be rated and incorporated into classes. From the analysis of the potential for ground movement, it can be concluded that the study area is dominated by stable to less stable zone. As for areas that are considered unstable are several points of the slope Cimandiri river which is also the fault zones and fault Cimandiri Hegarmanah, with lithology batubeku andesite, limestone and alluvium.  Keywords : Landslide, Soil Movement, geological mapping
Co-Authors Adithya Ramadhani Hasibuan Adycipta Adycipta Ahmad Husaeni Dicky Muslim Djadjang Jedi Setiadi Firman Ardiansyah Bumolo Juniarto, Reinaldi M. Dwiki Satrio Muhammad Farhan Darmawan Nisa Nurul Ilmi Nurdrajat Nurdrajat Yusi Firmansyah