Changes and Significance of Biomarkers in Thermal Evolution of Fengcheng Formation Source Rocks in Northwestern Margin of Junggar Basin

doi:10.7657/XJPG20220606

Abstract

Abstract:

A thermal simulation experiment in a closed system was conducted on the cores of argillaceous source rocks in the Permian Fengcheng formation of the Mahu sag in the northwestern margin of the Junggar basin. Taking the thermal simulation temperature as a scale，the evolution characteristics and applicable ranges of the biomarkers in different stages of maturity were analyzed in light of the parameters for identifying typical biomarkers in the Fengcheng formation source rocks，which includes Pr/Ph，Pr/nC₁₇，absolute content of β-carotane，distribution patterns of C₂₀，C₂₁ and C₂₃ tricyclic terpenes，and ratio of pregnane to regular sterane. On this basis，it is expected to more accurately identify the high-matured oil and gas from the Fengcheng formation in the northwestern margin of the Junggar basin by comparing with the crude oil in the West Pen-1 sag. The results show that，in addition to the distribution patterns of C₂₀，C₂₁ and C₂₃ tricyclic terpenes，the typical oil-source correlation parameters of the Fengcheng formation such as Pr/Ph，Pr/nC₁₇，and absolute content of β-carotane are greatly affected by maturity and cannot be used to identify the source of high-matured condensate oil and gas. By considering the maturity in the process of oil-source correlation and combined with the newly established carbon isotope chart of normal alkane monomers for the Fengcheng formation source rocks，the controversial high-mature condensate oil from Well Pen-5 in the West Pen-1 sag was analyzed. It is speculated that the condensate oil from Well Pen-5 mainly came from the Fengcheng formation source rocks.

Key words: Junggar basin, northwestern margin, Fengcheng formation, source rock, biomarker, thermal simulation, high-matured crude oil

CLC Number:

TE121

JIANG Wenlong, Ablimit·YIMING , BIAN Baoli, WANG Tao, REN Haijiao, HAN Yang. Changes and Significance of Biomarkers in Thermal Evolution of Fengcheng Formation Source Rocks in Northwestern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2022, 43(6): 684-692.

Figures/Tables 10

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