Evaluasi Hidrokarbon Alifatik dan Aromatik Batuan Sedimen Polaman 2 (PLM-2) Formasi Ngrayong, Cekungan Jawa Timur Utara, Sebagai Aspek Geokimia Organik

Anugra, Fery (2021) Evaluasi Hidrokarbon Alifatik dan Aromatik Batuan Sedimen Polaman 2 (PLM-2) Formasi Ngrayong, Cekungan Jawa Timur Utara, Sebagai Aspek Geokimia Organik. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Evaluasi hidrokarbon alifatik dan aromatik batuan sedimen Polaman 2 (PLM-2) sebagai aspek geokimia organik telah diperoleh melalui analisis biomarka. Analisis biomarka dilakukan melalui metode ekstraksi, fraksinasi, serta identifikasi struktur biomarka menggunakan gabungan Kromatografi Gas-Spektrometri Massa (KG-SM). Ditemukannya senyawa homolog n-alkana dengan distribusi bimodal menunjukkan sumber bahan organik lebih dari satu. Nilai rasio LMW/HMW = 0,02; Wax Index = 0,26; C31/C19 = 15,46; dan keberadaan kelompok senyawa triterpenoid pentasiklik menunjukkan sumber bahan organik berasal dari alga, makrofit, tumbuhan tingkat tinggi dan bakteri. Kelompok senyawa hopana berstruktur ββ, senyawa triterpenoid pentasiklik monoaromatik berkerangka karbon tak jenuh, serta diperolehnya nilai CPI = 1,68 dan LHCPI = 0,03 menunjukkan kematangan termal rendah. Nilai rasio Pr/Ph sebesar 1,26 dengan rendahnya kelimpahan 5α(H)-pregnana dan gamaserana, serta tingginya kelimpahan de-A-lupana mengindikasikan bahan organik diendapkan dalam lingkungan oksik. ===================================================================================================== Evaluation of aliphatic and aromatic hydrocarbons in Polaman 2 (PLM-2) sedimentary rock as an organic geochemistry aspect has been obtained through biomarker analysis. Analysis of biomarkers was carried out by extraction, fractionation, and identification of the structure of biomarkers using a combination of Gas Chromatography-Mass Spectrometry (GC-MS). The discovery of n-alkane homologous compounds with a bimodal distribution indicates more than one source of organic matter. The ratio value of LMW/HMW = 0.02; Wax Index = 0.26; C31/C19 = 15.46; and the presence of pentacyclic triterpenoid compounds indicates that the source of organic matter comes from algae, macrophyte, higher plants, and bacteria. The group of hopane compounds with ββ structure, unsaturated carbon skeleton on monoaromatic pentacyclic triterpenoids, also the values of CPI = 1.68 and LHCPI = 0.03 indicate low thermal maturity. Pr/Ph ratio value is 1.26 with the low abundance of 5α(H)-pregnana and gammacerane, and the high abundance of de-A-lupane indicated that the organic matter was deposited in an oxic environment

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Polaman Sediments, Ngrayong Formation, Aliphatic and Aromatic Hydrocarbon, Organic Geochemistry, Sources of Origin Indicators, Sedimen Polaman, Formasi Ngrayong, Hidrokarbon Alifatik dan Aromatik, Geokimia Organik, Indikator Sumber Asal-usul
Subjects: Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas
Q Science > QD Chemistry > QD63 Extraction
Divisions: Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User: Fery Anugra
Date Deposited: 01 Sep 2021 05:33
Last Modified: 01 Sep 2021 05:33
URI: https://repository.its.ac.id/id/eprint/90842

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