Biomarka Hidrokarbon Alifatik Batubara GL-04 Formasi Tanjung, Cekungan Barito, Kalimantan Tengah dan Prospeknya sebagai Sumber Coalbed Methane

Putri, Rizka Berliana (2023) Biomarka Hidrokarbon Alifatik Batubara GL-04 Formasi Tanjung, Cekungan Barito, Kalimantan Tengah dan Prospeknya sebagai Sumber Coalbed Methane. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis biomarka sampel batubara GL-04 dari Formasi Tanjung, Cekungan Barito, Kalimantan Tengah dilakukan dengan metode ektraksi, fraksinasi dan identifikasi dengan metode gabungan Gas Chromatography-Mass Spectrometry (GC-MS) untuk mengetahui karakteristik geokimia organiknya. Hasil identifikasi menunjukkan n-alkana dengan distribusi unimodal mengindikasikan sumber bahan organik didominasi oleh tumbuhan terestrial dengan sedikit kontribusi alga dan bakteri. Dominasi rantai karbon ganjil terhadap rantai karbon genap, khususnya kelimpahan maksimum pada n-C29 mengindikasikan kematangan rendah dengan tingkat biodegradasi tinggi. Hasil ini dibuktikan oleh nilai CPI > 1; OEP-2 > OEP-1; S/L CPI < 1, waxiness index > 2; LMW/HMW < 1; TAR >1; Paq < 0,4; AI < 0,5; ACL < 30; NAR ~ 0; dan rasio 8β(H)-homodrimana/8β(H)-drimana > 1. Keberadaan isomer kurang stabil seperti 17β(H)-22,29,30-trisnorhopana (βTm) dan 4,4,8,9,9-pentametildekalin juga membuktikan indikasi tersebut. Rasio Pr/Ph > 10,3; C32/C31 hopana < 0,8; dan crossplot Pr/n-C17 terhadap Ph/n-C18 menunjukkan indikator lingkungan pengendapan terestrial pada kondisi oksik dengan kematangan rendah. Analisis biomarka secara keseluruhan menunjukkan batubara GL-04 merupakan batubara humat kerogen tipe-III yang mengarah kepada pembentukan gas (gas-prone) sehingga berpotensi sebagai sumber Coalbed Methane (CBM).
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Biomarker analysis of GL-04 coal sample from Tanjung Formation, Barito Basin, Central Kalimantan was carried out by extraction, fractionation and identification used combination method of Gas Chromatography-Mass Spectrometry (GC-MS) to determine its organic geochemical characteristics. The results show that n-alkanes with a unimodal distribution indicated source of organic matter were dominated by terrestrial plants with little contribution from algae and bacteria. The predominance of odd carbon chain over even carbon chain, especially maximum abundance at n-C29 indicates low maturity with high biodegradation rate. This result is evidenced by the value of CPI > 1; OEP-2 > OEP-1; CPI S/L < 1, waxiness index > 2; LMW/HMW < 1; TAR >1; Paq < 0.4; AI < 0.5; ACL < 30; NAR ~ 0; and 8β(H)-homodrimane/8β(H)-drimane ratio > 1. The presence of less stable isomers such as 17β(H)-22,29,30-trisnorhopana (βTm) and 4,4,8,9,9-pentamethyldecalin also proves this indication. Pr/Ph ratio > 10.3; C32/C31 hopane < 0.8; and the Pr/n-C17 versus Ph/n-C18 crossplot show indicators of terrestrial depositional environment in oxic conditions with low maturity. Biomarker analysis as a whole shows that GL-04 coal is humic coal that belongs to type-III kerogen which leads to the formation of gas (gas-prone) so it has the potential as a source of Coalbed Methane (CBM).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Batubara GL-04, Biomarka, Coalbed Methane, Geokimia Organik, GL-04 Coal, Biomarkers, Organic Geochemistry.
Subjects:	Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Rizka Berliana Putri
Date Deposited:	07 Dec 2023 06:24
Last Modified:	07 Dec 2023 06:24
URI:	http://repository.its.ac.id/id/eprint/103844

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