Evaluation of Hydrocarbon Generation Potential of Lacustrine Shale of Lianggaoshan Formation in Fuling Area, Southeastern Sichuan

doi:10.11885/j.issn.1674-5086.2021.11.29.02

Abstract

Abstract: In order to ascertain the hydrocarbon generation potential of the lacustrine shale of Lianggaoshan Formation in Fuling Area of southeastern Sichuan, geochemical test and analyses were done to more than 400 samples of Lianggaoshan Formation from more than 10 oil-bearing shale wells in this area. The research results show that Lower Liang-2 Member and Upper Liang-1 Member have the highest abundance of organic matter, with average TOC contents of 1.57% and 0.81% respectively, the hydrocarbon generation potential (S₁+S₂) of rock pyrolysis is 2.63~5.59 mg/g, and the major type of kerogen are II₁ and II₂. The reflectivity of the vitrinite of lacustrine shale is between 0.98% and 1.46%, which has the characteristics of mature to highly mature evolution. Based on the geochemical characteristics of the lacustrine organic matter in Lianggaoshan Formation, three different kerogen hydrocarbon generation kinetic models were established with reference to the principle of volume dynamics, which effectively restored the hydrocarbon generation and expulsion history of the mud shale in Lianggaoshan Formation in Fuling Area. The simulation results show that the hydrocarbon generation conversion rate of the mud shale of Lianggaoshan Formation in Fuling Area is 65.0%~98.2%, the hydrocarbon generation evolution process has a “single peak” characteristic, and the maximum hydrocarbon production rate is 5.15~18.50 mg/(g·Ma). The total hydrocarbon generation volume is 630 000 to 1 440 000 t. The hydrocarbon generation potential of source rocks is controlled by the sedimentary environment: from lake-side lakes to shallow lakes to semi-deep lakes, the hydrocarbon generation conversion rate, the maximum hydrocarbon production rate and the total amount of hydrocarbon generation show a gradual increase trend, of which semi-deep lake facies shale is the highest quality source rock in Fuling Area, which is mostly distributed in the area of TL7–YX1–TY1, and is the most favorable continental shale oil enrichment area in this area.

Key words: lacustrine shale, geochemical characteristics, history of hydrocarbon generation and expulsion, Lianggaoshan Formation, hydrocarbon potential, Fuling Area

CLC Number:

TE122

LI Bin, JI Xin, PENG Jun, ZHANG Kun, WEI Xiangfeng. Evaluation of Hydrocarbon Generation Potential of Lacustrine Shale of Lianggaoshan Formation in Fuling Area, Southeastern Sichuan[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(6): 43-56.

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