Study on the TOC lower limit of shale oil and gas of freshwater lake facies: a case study on the Jurassic Da'anzhai member in the Sichuan Basin

doi:10.3969/j.issn.1672-7703.2018.06.005

Abstract

Abstract: The commercial development of marine shale gas has been successfully realized in China, but the exploration and development of lacustrine shale oil and gas is in dispute all the time and one of the important evaluation indexes is the TOC lower limit of shale oil and gas. Firstly, continental shale oil and gas was investigated and analyzed. Then, the freshwater lake facies of Jurassic Da'anzhai member in the Sichuan Basin was taken as the research object to analyze the geological conditions for the formation of shale oil and gas from the aspects of rock type, mineral composition and geochemical characteristic of lacustrine shale. After abundant pyrolysis data of organic carbon in shale, the relationship between shale gas producing interval and TOC and the relationship between shale oil producing interval and TOC were analyzed comprehensively, the TOC lower limit of shale oil and gas of freshwater lake faces was preliminarily determined to be 1.5%, which is in line with the practical exploration value. It is indicated that the determined TOC lower limit of lacustrine shale oil and gas is reasonable. Finally, the distribution of Da'anzhai high-quality lacustrine shale (TOC>1.5%) was delineated accordingly. The research results indicate the direction for the exploration and development of lacustrine oil and gas in the Sichuan Basin.

Key words: TOC lower limit, pyrolysis parameter, shale oil, shale gas, lacustrine facies, Da'anzhai member, the Sichuan Basin

CLC Number:

Huang Dong, Duan Yong, Li Yucong, Chen Hongbin, Yan Weipeng, Dai Hongming. Study on the TOC lower limit of shale oil and gas of freshwater lake facies: a case study on the Jurassic Da'anzhai member in the Sichuan Basin[J]. China Petroleum Exploration, 2018, 23(6): 38-45.

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