Statistics Analysis of Illite 40Ar-39Ar Ages and Petroleum Accumulation Period

Statistics Analysis of Illite 40Ar-39Ar Ages and Petroleum Accumulation Period

Hydrocarbons

Regression analysis

Gas industry

Statistics

Petroleum geology

For determining the hydrocarbon accumulation ages of Sulige gas field in the Ordos basin, porefilling clay materials were extracted from reservoir sandstones and separated into frictions of 0.5, 0.5-1.0 and 1.0-2.0 m, then 40Ar39Ar dating of illite was dealt with laser stepheating. The isochron age is a mixed age of authigenic illite and detrital illite. Through trend analysis and regression analysis, minimum trend age and minimum regression age are obtained, which are more close to authigenic illite ages. The result shows that the isochron ages of illite minerals range from 163.1 Ma to 224.3 Ma, which are the mixed ages of authigenic illite and detrital illite. Based on mathematical statistics method, the minimum trend age and the minimum regression age are extrapolated to be 151.7 Ma and 152.4 Ma, respectively, which are supposed to be more close to authigenic illite ages, representing the time of thermal fluid activity and hydrocarbon accumulation. 2022, Editorial Department of Earth Science. All right reserved.

479-489

47

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences

2022

Wang, Longzhang

Wang, Liyun

Li, Ji

Xiao, Jiaojing

Guo, Wei

Shen, Ao

Xu, Qiao

Wang, Yaru

journalArticle

10002383

10.3799/dqkx.2022.071