Karakteristik Geokimia Organik Minyak Kondensat Lapangan Tangguh, Cekungan Bintuni, Papua Barat

Salsabila, Finna Ananda (2026) Karakteristik Geokimia Organik Minyak Kondensat Lapangan Tangguh, Cekungan Bintuni, Papua Barat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis biomarka minyak kondensat Lapangan Tangguh, Cekungan Bintuni, dilakukan terhadap fraksi hidrokarbon alifatik dan aromatik untuk menentukan sumber material organik, lingkungan pengendapan, dan tingkat kematangan termal. Karakterisasi biomarka dilakukan melalui fraksinasi dan identifikasi senyawa menggunakan KG-SM. Hasil menunjukkan dominasi n-alkana rantai pendek hingga menengah dengan kelimpahan tertinggi pada n-C13 yang mengindikasikan sumber bahan organik didominasi oleh alga, fitoplankton, dan bakteri akuatik dengan kontribusi minor organisme terestrial. Nilai CPI sebesar 1,17; LHCPI >1; TAR <1; Paq >0,4; WI <0,4; rasio n-C31/n-C19 sebesar 0,018; rasio 8β(H)-homodrimana/8β(H)-drimana sebesar 0,34; serta rasio 1-MP/9-MP sebesar 0,89 mendukung dominasi input organik akuatik. Keberadaan hopana dan homohopana menunjukkan kontribusi mikroorganisme, khususnya bakteri, sedangkan C15 seskuiterpana turunan oleanana dan retena menunjukkan masukan kontribusi terestrial. Lingkungan pengendapan diinterpretasikan sebagai sistem marine terstratifikasi dengan variasi kondisi redoks secara vertikal. Distribusi hopana dan drimana menunjukkan kondisi marine reduksi pada bagian bawah sedimen, meskipun rasio Pr/Ph sebesar 3,63 dan diagram Hunt mengindikasikan kondisi oksik hingga sub-oksik pada lapisan perairan atas. Parameter kematangan termal seperti OEP sebesar 0,99; rasio C31 homohopana 22S/(22S+22R) sebesar 0,71; MNR >1; DNR >5; TMNr >0,35; TeMNr >0,35; MPI-1 >0,5; MPI-2 >0,5; MPI-3 >1; MPR >1,20; dan Rc sebesar 0,8% menunjukkan tingkat kematangan termal tinggi dan sampel berada pada puncak oil window. Minyak kondensat Lapangan Tangguh berasal dari kerogen tipe II/III yang bersifat oil-gas prone dengan dominasi material organik akuatik dan telah mengalami pematangan termal lanjut.
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Biomarker analysis of condensate oil from the Tangguh Field, Bintuni Basin, was conducted on aliphatic and aromatic hydrocarbon fractions to determine the source of organic matter, depositional environment, and thermal maturity level. Biomarker characterization was performed through fractionation and compound identification using GC–MS. The results show a dominance of short- to medium-chain n-alkanes, with the highest abundance observed at n-C13, indicating that the organic matter source was predominantly derived from algae, phytoplankton, and aquatic bacteria, with a minor contribution from terrestrial organisms. CPI value of 1.17; LHCPI >1; TAR <1; Paq >0.4; WI <0.4; n-C31/n-C19 ratio of 0.018; 8β(H)-homodrimane/8β(H)-drimane ratio of 0.34; and 1-MP/9-MP ratio of 0.89 further support the dominance of aquatic organic input. The presence of hopanes and homohopanes indicates contributions from microorganisms, particularly bacteria, whereas C15 oleanane-derived sesquiterpanes and retene suggest a terrestrial organic matter contribution. The depositional environment is interpreted as a stratified marine system with vertically varying redox conditions. Distrbution of hopane and drimane indicate reducing marine conditions in the lower sediment layers, while Pr/Ph ratio of 3.63 and the Hunt diagram suggest oxic to sub-oxic conditions in the upper water column. Thermal maturity parameters, including OEP value of 0.99, C31 homohopane 22S/(22S+22R) ratio of 0.71 ;MNR >1; DNR >5; TMNr >0.35; TeMNr >0.35; MPI-1 >0.5; MPI-2 >0.5; MPI-3 >1; MPR >1.20; and Rc value of 0.8%, indicate a high level of thermal maturity, the samples in peak oil window stage. The Tangguh Field condensate oil originated from mixed Type II/III kerogen with oil- and gas-prone characteristics, dominated by aquatic organic matter input and having undergone advanced thermal maturation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Biomarka, Fraksi Alifatik/Aromatik, Geokimia Organik, KG-SM, Kondensat Aliphatic/aromatic hydrocarbons, Biomarkers, Condensate, GC-MS, 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:	Finna Ananda Salsabila
Date Deposited:	04 Aug 2026 07:47
Last Modified:	04 Aug 2026 07:47
URI:	http://repository.its.ac.id/id/eprint/143372

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