淡水湖相页岩油气有机碳含量下限研究——以四川盆地侏罗系大安寨段为例

doi:10.3969/j.issn.1672-7703.2018.06.005

摘要/Abstract

摘要： 国内海相页岩气已成功实现商业化有效开发，但对于湖相页岩油气的勘探开发始终存在较大争议，其中一个重要的评价指标就是页岩油气的有机碳含量下限。在陆相页岩油气调研分析的基础上，以四川盆地侏罗系大安寨段淡水湖相为对象，从湖相页岩岩石类型、矿物组分特征、地球化学特征等开展页岩油气形成地质条件分析，并根据大量页岩有机碳热解数据、页岩产气层段与有机碳含量关系、页岩产油层段与有机碳含量关系的综合分析，初步确定淡水湖相页岩油气的有机碳下限为1.5%，试验数据与勘探实践较为吻合，确立的湖相页岩油气有机碳下限较为合理。并以此为依据，圈定了大安寨段有机碳含量大于1.5%的湖相优质页岩分布范围，为盆地下步湖相页岩油气勘探开发指明了方向。

关键词: 有机碳下限, 热解参数, 页岩油, 页岩气, 湖相, 大安寨段, 四川盆地

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

中图分类号:

黄东, 段勇, 李育聪, 陈洪斌, 闫伟鹏, 戴鸿鸣. 淡水湖相页岩油气有机碳含量下限研究——以四川盆地侏罗系大安寨段为例[J]. 中国石油勘探, 2018, 23(6): 38-45.

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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