Karakteristik Biomarka Minyak Kondensat Escrafos, Formasi Agbada, Cekungan Delta Niger

Agustin, Naura Eliza (2026) Karakteristik Biomarka Minyak Kondensat Escrafos, Formasi Agbada, Cekungan Delta Niger. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Analisis biomarka hidrokarbon alifatik dan aromatik telah dilakukan pada sampel kondensat Escrafos dari Cekungan Niger Delta untuk mengkaji sumber bahan organik, tingkat kematangan termal, dan lingkungan pengendapannya. Hasil identifikasi menunjukkan bahwa sumber bahan organik kondensat berasal dari campuran material akuatik/laut dan terestrial. Interpretasi ini didukung oleh dominasi n-alkana rantai pendek dengan pola distribusi unimodal, nilai parameter geokimia LMW/HMW, LHCPI, Paq, TAR, CPI, Waxiness Index, rasio $8\beta(\text{H})$-homodrimana/$8\beta(\text{H})$-drimana, dan 9-MP menunjukkan input bahan organik akuatik/laut, serta keberadaan senyawa kadalena mencerminkan masukan tumbuhan terestrial. Diagram Hunt juga menempatkan sampel pada zona campuran. Tingkat kematangan termal kondensat tergolong tinggi, yang ditunjukkan oleh dominasi n-alkana rantai pendek, nilai CPI dan OEP yang mendekati 1, kelimpahan $17\alpha(\text{H}),21\beta(\text{H})$-hopana yang lebih tinggi dibandingkan $17\beta(\text{H}),21\alpha(\text{H})$-moretana, serta nilai MPI-1, %Rc, MPR, dan DNR-1. Lingkungan pengendapan diinterpretasikan sebagai lingkungan transisional atau campuran dengan kondisi redoks yang bervariasi, berdasarkan nilai Pr/Ph, plot CPI–OEP, dan distribusi drimana serta homodrimana. Nilai TAR dan adanya senyawa 9-MP menunjukkan sampel terendapkan pada lingkungan laut. Secara keseluruhan, kondensat Escrafos berasal dari campuran bahan organik akuatik/laut dan terestrial yang terendapkan pada lingkungan transisional serta telah mengalami kematangan termal yang tinggi.
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Biomarker analysis of aliphatic and aromatic hydrocarbons was conducted on Escrafos condensate samples from the Niger Delta Basin to investigate the source of organic matter, thermal maturity, and depositional environment. The results indicate that the condensate was derived from a mixed aquatic/marine and terrestrial organic matter source. This interpretation is supported by the predominance of short-chain n-alkanes with a unimodal distribution pattern and by geochemical parameters including LMW/HMW, LHCPI, Paq, TAR, CPI, Waxiness Index, the $8\beta(\text{H})$-homodrimane/$8\beta(\text{H})$-drimane ratio, and 9-methylphenanthrene (9-MP), which suggest significant aquatic/marine organic matter input. In addition, the presence of cadalene reflects contributions from terrestrial higher plants. The Hunt diagram further places the sample within a mixed-source domain. The condensate exhibits a high level of thermal maturity, as indicated by the dominance of short-chain n-alkanes, CPI and OEP values approaching unity, a higher abundance of $17\alpha(\text{H}),21\beta(\text{H})$-hopane relative to $17\beta(\text{H}),21\alpha(\text{H})$-moretane, and the values of MPI-1, %Rc, MPR, and DNR-1. The depositional environment is interpreted as transitional or mixed, with variable redox conditions, based on the Pr/Ph ratio, CPI–OEP plot, and the distribution of drimane and homodrimane compounds. Furthermore, TAR values and the occurrence of 9-MP indicate deposition under marine conditions. Overall, the Escrafos condensate originated from a mixture of aquatic/marine and terrestrial organic matter deposited in a transitional environment and has undergone a high degree of thermal maturity.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Kondensat Escrafos, biomarka, geokimia organik, Niger Delta Escrafos condensate, biomarker, organic geochemistry, Niger Delta.
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:	Naura Eliza Agustin
Date Deposited:	05 Aug 2026 00:58
Last Modified:	05 Aug 2026 00:58
URI:	http://repository.its.ac.id/id/eprint/143712

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