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All Journal Journal of Applied Sciences, Management and Engineering Technology (JASMET) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Adlan, Ryandi
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Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Karakteristik Geokimia dan Biomarker Rembesan Minyak di Daerah Torete, Morowali, Sulawesi Tengah Fahruddin, Achmad; Ariyono Subroto, Eddy; Susanto, Very; Dwita Santy, Lauti; Adlan, Ryandi
Jurnal Geologi dan Sumberdaya Mineral Vol. 25 No. 4 (2024): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v25i4.806

Abstract

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.
Linking Carbonate Facies to Stylolite Distribution of Middle Jurassic Limestone, Onshore Abu Dhabi Oil Field Prahastomi, Mochammad; Morad, Sadoon; Al Suwaidi, Aisha; Ali, Mohammed; Muljana, Budi; Adlan, Ryandi
Journal of Applied Sciences, Management and Engineering Technology Vol 6, No 2 (2025)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2025.v6i2.8190

Abstract

This study examines the relationship between facies and stylolitization in the Upper Araej Member carbonates of onshore Abu Dhabi. Analysis of core and thin sections identified four facies: wispy-laminated skeletal wackestone (F-1), peloidal skeletal mud-dominated packstone (F-2), coated-grain skeletal grainstone (F-3), and peloidal skeletal floatstone (F-4), deposited across a shallow carbonate ramp. Stylolites were described and measured for vertical offset amplitude to assess facies dependence. Results show facies-related tendencies in stylolite amplitude and morphology. Mud-supported facies (especially floatstones and wackestones) tend to display higher variability, with floatstones reaching amplitudes of up to 20 mm, whereas grainstones may also contain isolated high-amplitude stylolites (up to 14 mm). Packstones and wackestones, by contrast, rarely exceed 10-13 mm. Boxplots highlight greater variability in mud-rich facies, whereas grainstones exhibit narrower distributions. Statistical testing (ANOVA, p = 0.109; Kruskal–Wallis, H = 3.38, p = 0.34) indicates no statistically significant differences in mean stylolite amplitude across facies, although descriptive data reveal trends in variability and extremity. Jagged stylolites occur in both mud-rich and grain-supported facies, whereas wispy seams are strongly associated with micrite-rich facies and are largely absent in grainstones. Stylolites in these carbonates may act as both vertical barriers and localized porosity enhancers. Their facies-associated occurrence emphasizes the need to integrate stylolitization into reservoir models to better predict connectivity, compartmentalization, and flow behavior in Middle Jurassic carbonates.
Co-Authors Achmad Fahruddin Al Suwaidi, Aisha Ali, Mohammed Ariyono Subroto, Eddy Budi Muljana Dwita Santy, Lauti Morad, Sadoon Prahastomi, Mochammad Susanto, Very