Application of Weathering Correction in Organic Geochemistry of Source Rocks

doi:10.11885/j.issn.1674-5086.2019.07.04.02

Abstract

Abstract: Through field profile observation and sample collection of the Lower Permian in Hami Depression, the laboratory test was carried out by using rock pyrolysis, organic carbon test, kerogen analysis, gas chromatograms of saturated hydrocarbonand other technologies. On the basis of a combination with existing analysis data, this paper gives systematic evaluation about abundance of organic matter, type and maturity grade of Lower Permian Hami Depression source rocks, discusses the primary sedimentary environment and source characteristics of organic materials. Relevant results show that Lower Permian Hami Depression source rocks are very good source rock. The major type of organic materials give priority is sapropel humus type (Ⅱ₂), with a small amount of humus types (Ⅲ); the organic materials are the low-medium period of highly mature stage with high grande of evolution; n-alkanes of source rocks present great changes in distribution, a twin-peak feature of low first and high later. The contrast with quite low light-heavy hydrocarbon ratio reflects that organic materials are significantly influenced by terrigenous organisms. The low Pr/Ph ratio shows strong phytane advantages. Sedimentary environment presents relatively strong reducibility with high salinity, so it is semi-closed water.

Key words: Hami Depression, source rock, Lower Permian, weathering, organic

CLC Number:

TE122

MI Weiwei, WANG Teng, LI Na, GUO Xiaodan, XIE Xiaofei. Application of Weathering Correction in Organic Geochemistry of Source Rocks[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1): 61-71.

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