Karakteristik Geokimia Organik Coal Bed Methane (CBM-4), Tambang Batubara Muara Enim, Lapangan Rambutan, Cekungan Sumatera Selatan

Pratama, Arga Dias (2019) Karakteristik Geokimia Organik Coal Bed Methane (CBM-4), Tambang Batubara Muara Enim, Lapangan Rambutan, Cekungan Sumatera Selatan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kajian geokimia organik terhadap sampel Coal Bed Methane (CBM-4) yang berlokasi di Tambang Batubara Muara Enim telah dilakukan. Analisis biomarka dilakukan melalui metode ekstraksi dan fraksinasi, serta identifikasi struktur senyawa menggunakan instrumen kromatografi gas-spektrometer massa (KG-SM). Identifikasi biomarka menunjukkan adanya n-alkana (n-C16-n-C33) dengan n-C31 merupakan senyawa dengan kelimpahan tertinggi sebagai indikator senyawa organik berasal dari tumbuhan tingkat tinggi terestrial. Rasio Pr/Ph = 7,87 menunjukkan lingkungan pengendapan oksik. Nilai CPI = 4,35 dan rasio C31αβS/(S + R) = 0,14, mengindikasikan kematangan yang rendah dari CBM-4 yang dianalisis. Rendahnya kematangan sampel, menunjukkan bahwa gas metana yang terperangkap dalam batubara (CBM-4) terbentuk melalui siklus karbon pendek pada tahap diagenesis. Keberadaan metilfenantrena dan beberapa biomarka lainnya sebagai indikator tumbuhan tingkat tinggi Angiospermae menunjukkan bahwa sampel CBM-4 cenderung menghasilkan gas (gas-prone).
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An organic geochemistry study on a sample of Coal Bed Methane (CBM-4) located at Muara Enim Coal Mine has been carried out. Biomarker analysis was carried out through extraction and fractionation methods, and identification of compound structures using gas chromatography-mass spectrometer (GC-MS) instruments. Biomarker identification indicate the presence of n-alkana (n-C16-n-C33) with n-C31 the highest abundance compound an indicator of organic compounds derived from high terrestrial plants. The ratio of Pr/Ph = 7.87 shows the oxidation deposition environment. The CPI value = 4.35 and the C31αβS/(S+R) ratio = 0.14, indicating the low maturity of the CBM-4 analyzed. The low maturity of the sample shows that methane gas trapped in coal (CBM-4) is formed through a short carbon cycle at the diagenesis stage. The presence of methylphenantrene and several other biomarkers as plant indicators of high levels of Angiosperms show that CBM-4 samples tend to produce gas.

Item Type:	Thesis (Other)
Subjects:	Q Science Q Science > QD Chemistry Q Science > QD Chemistry > QD251.2 Chemistry, Organic. Biochemistry Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas Q Science > QD Chemistry > QD63 Extraction
Divisions:	Faculty of Natural Science > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Pratama Arga Dias
Date Deposited:	20 Jul 2026 06:00
Last Modified:	20 Jul 2026 06:00
URI:	http://repository.its.ac.id/id/eprint/67497

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