Karakteristik Geokimia dan Biomarker Rembesan Minyak di Daerah Torete, Morowali, Sulawesi Tengah
Geochemical and Biomarker Characteristics of Oil Seepages in Torete Area, Morowali, Central Sulawesi
DOI:
https://doi.org/10.33332/jgsm.geologi.v25i4.806Abstract
Dua buah rembesan minyak bumi diambil dari daerah Torete, Morowali, Provinsi Sulawesi Tengah. Kedua sampel rembesan telah dilakukan analisis GC (gas chromatography) dan GCMS (gas chromatography and mass spectometry). Analisis geokimia biomarker dilakukan untuk mengetahui karakter minyak bumi berupa asal material organik, lingkungan pengendapan, dan tingkat kematangan. Pada kromatogram alkana normal, kedua sampel menunjukkan satu puncak (unimodal) sebelum nC20 dengan rasio Pr/Ph 0,87 dan 0,92. Fragmentogram m/z 217 menunjukkan sedikit dominasi pada sterana C29 dibanding sterana C27 dan sedikit kehadiran dari diasterana. Fragmentogram m/z 191 menunjukkan adanya dominasi pada terpana trisiklik C23 dan terpana tetrasiklik C24 serta kehadiran terpana trisiklik C26+. Pada terpana pentasiklik menunjukkan dominasi Tm terhadap Ts, hopana C29 terhadap hopana C30, kehadiran seri norhopana C30 dan gamaserana, serta homohopana C35 yang sedikit lebih tinggi dari homohopana C34. Biomarker petunjuk tumbuhan tinggi (oleanana dan bikadinana) tidak hadir pada kedua sampel. Hal ini menunjukkan bahwa kedua sampel minyak bumi berasal dari batuan induk karbonat dengan material organik alga, plankton, radiolaria, atau diatom lingkungan pengendapan anoksik-suboksik (lingkungan transisional), dan tingkat kematangan awal matang sampai level matang.
Katakunci: biomarker, GC, GCMS, Torete, Morowali, Sulawesi Tengah.
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Copyright (c) 2024 Achmad Fahruddin, Eddy Ariyono Subroto, Very Susanto, Lauti Dwita Santy, Ryandi Adlan
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