Organic Geochemical Characteristics and Oil Source Comparison of Bitumen from Huanglong Formation of Huaying in Eastern Sichuan Basin

doi:10.11885/j.issn.1674-5086.2019.09.27.01

Abstract

Abstract: The void of the dolomite of Huanglong Formation in section of Xikou town of Huaying are filled with a large amount of bitumen, in the field, samples of asphalt and source rocks of different strata were collected in the study area and adjacent areas to explore the organic geochemical characteristics and sources of bitumen.The results show that the content of organic carbon in the bitumen-bearing dolomite of Huanglong Formation is high, the value of R_o is 1.45% to 1.48%, the value of carbon isotope is -28.90‰, the content of saturated hydrocarbon and aromatic hydrocarbon are low, mainly non-hydrocarbon; the main peak carbon of paraffins is C₂₀, the value of Pr/Ph ratios from 0.78 to 0.79, the content of tricyclic terpanes C₂₃ > C₂₄ > C₂₁, the ratio of tricyclic terpanes to pentacyclic terpanes are from 0.82 to 1.06, in Sterane, the content of C₂₇ > C₂₉ > C₂₈, C₂₇ gonane is dominant, these parameters indicate that the sedimentary environment is reductive. The value of terpane parameters and Ts/(Tm+Ts) all indicate high maturity of bitumen. The value of DBT/P is from 1.48 to 1.88, indicating that the parent rock may be Marine marl deposit. According to the comprehensive comparison of biomarkers and bituminous isotopes, it is considered that the solid bitumen of Huanglong Formation comes from the earlier mature shale of Longmaxi Formation, the extraction of chloroform bitumen "A" has the characteristics of mixed source, which may contribute to the shale of Longmaxi Formation.

Key words: Huanglong Formation, bitumen, geochemical characteristics, comparison of oil and source, Xikou town in Huaying

CLC Number:

TE122

HE Lei, YANG Ping, XIE Yuan, WANG Zhengjiang, LIU Jiahong. Organic Geochemical Characteristics and Oil Source Comparison of Bitumen from Huanglong Formation of Huaying in Eastern Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 54-64.

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