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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral
Torkis Sihombing
Center for Geological Survey, Jln. Diponegoro 57 Bandung
Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Coalbed methane potential and coal characteristics in the Lati region, Berau basin, East Kalimantan Suwarna, Nana; Hermanto, Bambang; Sihombing, Torkis; Kusumah, Kusdji Darwin
Indonesian Journal on Geoscience Vol 1, No 1 (2006)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (933.643 KB) | DOI: 10.17014/ijog.v1i1.5

Abstract

http://dx.doi.org/10.17014/ijog.vol1no1.20063aA geological research was performed in the Berau Basin, to provide a better understanding on the potential and resources of coalbed methane (CBM) in Berau Regency, East Kalimantan Province, particularly in the Lati Coalfield. Field observation conducted in the coalfield, shows that the banded to bright banded Lati coal is dominated by the bright banded one. Petrographically, the coal consists of vitrinite comprising typical telocollinite and desmocollinite; with rare to sparse exinite, and minor inertinite, and mineral matter. Geochemical analysis shows the range of volatile matter content is from 32.65–39.60%, total sulfur from 0.35–3.04%, ash varies between 2.78–14.50%, and moisture from 12.23–19.98%. Vitrinite reflectance values (Rv), varying from 0.42–0.57%, tend to indicate that the Lati coal rank ranges from sub-bituminous B to high volatile bituminous C category, with low ash content in general. Moreover, the coal maturity level, thermally immature to early mature, leads to the assumption that the expected gas present is suggested to be of biogenic origin. The fairly well cleated Lati coal shows cleat orientations trending north - northeastward, perpendicular to nearly oblique to the syncline axis. Furthermore, coal microcleat occurs as open tensional, sub-curved to curved lines microcracks, diagonally to perpendicular to bedding plane, but some are parallel to the bedding plane. An in-situ coal gas calculation tends to indicate a low to moderate methane content level, with a value of 44.20–47.08 scf/t. However, the Q1 plus Q2 calculation exhibits the gas content ranging from 41.69 to 78.71 scf/t. Moreover, total calculated gas in-place of the P, Q, and R Seams =  5.33 m3/t = 191.56 scf/t.    
PERKEMBANGAN ELEMEN-ELEMEN PENTING TEKTONIK ASIA Sihombing, Torkis
Jurnal Geologi dan Sumberdaya Mineral Vol 15, No 2 (2014): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (167.908 KB)

Abstract

Di wilayah Asia terdapat beberapa elemen tektonik penting yang berinteraksi, sehingga sangat menentukan evolusi tektonik kawasan ini. Lempeng-lempeng tersebut meliputi lempeng Indo-Australia di selatan, lempeng Eurasia di baratlaut, serta lempeng Laut Filipina di bagian timur. Lempeng benua India merupakan bagian dari lempeng utama Indo-Australia yang terdiri atas sub-kontinen India dan cekungan di bawah Samudera Hindia. Himalaya merupakan salah satu pegunungan termuda di bumi ini. Menurut teori tektonik lempeng, pembentukan pegunungan tersebut sebagai hasil dari tumbukan benua, atau orogeni, sepanjang batas konvergensi antara Lempeng Indo-Australia (Lempeng India) dengan Lempeng Eurasia. Sementara secara geologi, Plato Tibet tidak dapat dipisahkan dari Himalaya, karena wilayah ini menyatu, dan sama-sama terbentuk sebagai akibat tumbukan lempeng India dengan Asia / Eurasia.Kata kunci: lempeng Indo-Australia, lempeng Eurasia, lempeng Laut Filipina, tumbukan, orogeni
Co-Authors Bambang Hermanto Kusdji Darwin Kusumah Nana Suwarna