An Analysis of Shallow Oil and Gas Sources and Exploration Enlightenment in Xiaermen Area of Biyang Depression

doi:10.11885/j.issn.1674-5086.2019.06.25.01

Abstract

Abstract: In order to find out the source of shallow oil and gas and the genesis of natural gas in Xiaermen Area of Biyang Depression, a comprehensive geochemical profile of source rock evaluation in Xiaermen Area is established by using various organic geochemical evaluation methods, and the relationship between oil and gas sources is analyzed. The composition and stable carbon isotope of natural gas are analyzed. The results show that the source rocks of Hetaoyuan Formation in Xiaermen Area are rich in organic matter, mainly of type I-Ⅱ₁, with a maturity threshold of about 2 200 m, the shallow source rock is dominated by low maturity, H₃ is in the mature stage; the shallow low maturity crude oil is dominated by the hydrocarbon generated by the upper H₃ source rock moving upward along the fault, and the mixed source oil formed by the infection of the shallow low maturity source rock; the natural gas is the bio-thermal catalytic transition zone gas. To clarify the source of oil and gas is conducive to guiding the next exploration and deployment in Xiaermen Area.

Key words: Biyang Depression, Hetaoyuan Formation, source rock, oil-source relationship, genesis of natural gas

CLC Number:

TE122

JIN Yunyun, SHI Zhengyong, REN Xiaoyu. An Analysis of Shallow Oil and Gas Sources and Exploration Enlightenment in Xiaermen Area of Biyang Depression[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 46-53.

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