Aspek Geokimia Organik dalam Menentukan Potensi Batubara SL-02, Sawahlunto dan KD-04, Sangatta sebagai Penghasil Gas Metana

Khozin, Muhamad Nur (2024) Aspek Geokimia Organik dalam Menentukan Potensi Batubara SL-02, Sawahlunto dan KD-04, Sangatta sebagai Penghasil Gas Metana. Masters thesis, Institut Teknologi Sepuluh Nopember.

Text 6004221011_Master_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 October 2026. Download (4MB) | Request a copy

Abstract

Batubara Sawahlunto dan Sangatta dianalisa untuk membandingkan karakter geokimia organiknya melalui analisa biomarka dengan metode Kromatografi Gas-Spektrometri Massa (KG-SM). Identifikasi struktur menunjukan adanya distribusi n-alkana, isoprenoid, dan triterpenoid. Senyawa n-alkana sampel batubara Sawahlunto menunjukkan distribusi unimodal n-C13 - n-C33 sedangkan batubara Sangatta n-C15 - n-C33 yang didominasi oleh n-alkana rantai panjang (>C20). Hal ini mengindikasikan sumber organik kedua sampel batubara berasal dari tumbuhan tingkat tinggi, dan rasio Pr/Ph > 3 menunjukan lingkungan pengendapan oksik. Beberapa parameter geokimia seperti CPI > 1, OEP > 1, LHCPI < 1, kelimpahan 17α(H)-21β(H)-homohopana (22S) < 17α(H)-21β(H)-homohopana (22R) serta keberadaan beberapa senyawa tak jenuh seperti olean-12-ena dan neohop-13(18)-ena, mengindikasikan tingkat kematangan rendah. Plot silang rasio Pr/n-C17 terhadap Ph/n-C18 pada diagram Hunt mendukung lingkungan pengendapan oksik dan merupakan kerogen Tipe III yang cenderung menghasilkan gas. Adanya senyawa 1,2,5-TMN pada sampel batubara Sawahlunto menunjukkan bahwa masukan bahan organik berasal dari reduksi β-amirin tumbuhan tingkat tinggi pada Angiospermae yang diendapkan pada lingkungan oksik. Senyawa 2 MP dan 1 MP pada sampel batubara Sawahlunto mempunyai kelimpahan yang tinggi dan nilai Methyl Phenanthrene Index (MPI) = 0,55, sedangkan pada sampel batubara Sangatta tidak ditemukan senyawa metil fenantrena. Dengan demikian, diduga batubara yang berasal dari tambang Sawahlunto (Sumatra Barat) dan Sangatta (Kalimantan Timur) ini, berpotensi sebagai sumber Coalbed Methane (CBM).
========================================================================================================================
Sawahlunto and Sangatta coal were analyzed to compare their organic geochemical character through biomarker analysis using the Gas Chromatography-Mass Spectrometry (GC-MS) method. Structural identification shows the distribution of n-alkanes, isoprenoids, and triterpenoids. The n-alkane compound of the Sawahlunto coal sample shows a unimodal n-C13 - n-C33 distribution while the Sangatta coal n-C15 - n-C33 is dominated by long chain n-alkanes (>C20). This indicates that the organic source of the two coal samples comes from higher plants, and the Pr/Ph ratio > 3 indicates an oxic deposition environment. Several geochemical parameters such as CPI > 1, OEP > 1, LHCPI < 1, abundance of 17α(H)-21β(H)-homohopane (22S) < 17α(H)-21β(H)-homohopane (22R) and the presence of several compounds unsaturated such as olean-12-ene and neohop-13(18)-ene, indicating low maturity levels. The cross plot of Pr/n-C17 to Ph/n-C18 ratios on the Hunt diagram supports an oxic deposition environment and is a Type III kerogen that tends to produce gas. The presence of the 1,2,5-TMN compound in Sawahlunto coal samples indicates that the input of organic matter comes from the reduction of β-amyrin from higher plants in Angiosperms deposited in an oxic environment. The 2 MP and 1 MP compounds in the Sawahlunto coal samples had high abundance and a Methyl Phenanthrene Index (MPI) value = 0.55, whereas in the Sangatta coal samples no methyl phenanthrene compounds were found. Thus, it is suspected that coal originating from the Sawahlunto (West Sumatra) and Sangatta (East Kalimantan) mines has the potential to be a source of Coalbed Methane (CBM).

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Batubara, coalbed methane (CBM), Biomarka, KG-SM, hidrokarbon alifatik, hidrokarbon aromatik Coal, Coalbed methane (CBM), Biomarka, GC-MS, aliphatic hydrocarbons, aromatic hydrocarbons
Subjects:	Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47101-(S2) Master Thesis
Depositing User:	Muhamad Nur Khozin
Date Deposited:	08 Aug 2024 02:17
Last Modified:	08 Aug 2024 02:17
URI:	http://repository.its.ac.id/id/eprint/111343

Actions (login required)

View Item