Analysis on Geological Conditions of Chang 7 Shale Gas Accumulation in Longdong Area in Ordos Basin

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Li, Zhenhua^1 ; Gai, Ke^1 ; Yu, Lan^1 ; Zhang, Suya^2 ; Sun, Ning^1 ; Li, Xiangyang^3

School of Energy Engineering, Longdong University, Qingyang, China^1

School of Foreign Languages, Longdong University, Qingyang, China^2

Gansu Coalfield Geology Bureau, Qingyang, China^3

关键词: Gas accumulation;    Geochemical characteristic;    Geological conditions;    Hydrocarbon generation potential;    Ordos Basin;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/2/022093/pdf
DOI  :  10.1088/1755-1315/300/2/022093

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The geological conditions of Chang 7 shale gas accumulation in Longdong area are analyzed from sedimentology, petrology and organic geochemical characteristics in this paper. The study shows that Chang 7 shale in Longdong area is mainly deposited in deep lake and semi deep lake, with thickness ranging from 10 m to 40 m. The shale is mainly composed of quartz, feldspar, clay minerals and a small amount of carbonate and pyrite, and its brittleness is high. TOC ranges from 1.5% to 20.0%, with an average of 7.9%, and hydrocarbon generation potential (S1+S2) ranges from 0.67 mg/g to 33.53 mg/g, with an average of 15.81 mg/g. The main organic matter belongs to type I and II, Ro ranges from 0.7% to 1.2%. It can be concluded that Chang 7 shale in Longdong area possesses favourable conditions for shale gas accumulation.