Genetic Types and Distribution of Crude Oil in Weixi'nan Depression, Beibuwan Basin

doi:10.11885/j.issn.1674-5086.2018.08.14.01

Abstract

Abstract: In this work, the characteristics of the source rocks in the Weixi'nan Sag are analyzed, based on a large amount of data from saturated hydrocarbon chromatography, mass spectrometry chromatography, and carbon isotope ratios, which were obtained from rock and crude oil samples. According to their geochemical characteristics, the source rocks are classified into three types (A, B, and C). Differences in the organic geochemical characteristics of the crude oils in the Weixi'nan Sag are also analyzed systematically, and their physical properties are analyzed statistically. Based on the genetic types according to the strontium, decane, and saturated hydrocarbon compositions, the crude oils are classified into five subgroups (A, B1, B2, C1, and C2). A detailed comparison of oil sources, and the analysis of the spatial distribution of the crude oil, show that type-A crude oil originates from type-A source rock, and is mainly distributed near fractures No. 1, 2, and 3, on the slopes in the southeast of the Weixi'nan Sag. Type-B1 and type-B2 crude oils originate from type-B source rock; type-B1 crude oil is mainly distributed near fracture No. 2, and type B2 crude oil is mainly concentrated near fracture No. 3. Type-C1 and type-C2 crude oils come from type-C source rock; type C1 crude oil is distributed in areas close to those of type-B2 crude oil, while type-C2 crude oil is mainly concentrated at the intersection between fracture No. 2 and fracture No. 3.

Key words: Weixi'nan Depression, genetic type of crude oil, geochemistry, distribution characteristics, hydrocarbon source rock

CLC Number:

TE132

YANG Xibing, JIN Qiuyue, HU Lin, HU Desheng. Genetic Types and Distribution of Crude Oil in Weixi'nan Depression, Beibuwan Basin[J]. 西南石油大学学报(自然科学版), 2019, 41(3): 51-60.

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