Effect of thermal maturity on shale pore structure: A combined study using extracted organic matter and bulk shale from Sichuan Basin, China

被引:59
|
作者
Zhang, Yifan [1 ]
Yu, Bingsong [1 ]
Pan, Zhejun [2 ]
Hou, Changhai [1 ]
Zuo, Quanwen [1 ]
Sun, Mengdi [2 ,3 ]
机构
[1] China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
[2] CSIRO Energy, Private Bag 10, Clayton, Vic 3169, Australia
[3] China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Wufeng-longmaxi; Niutitang; Marine shale; Extracted OM; Pore structure; OM pore evolution; NORTHEASTERN BRITISH-COLUMBIA; SIZE DISTRIBUTION; GAS-ADSORPTION; MARINE SHALES; BARNETT SHALE; ALBANY SHALE; POROSITY; CLASSIFICATION; VOLUME; OIL;
D O I
10.1016/j.jngse.2019.103089
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The thermal maturity is of great significance in the evolution of pores in gas shales. In this work, the comparison of pore structures between Wufeng-Longmaxi and Niutitang shales and its corresponding extracted organic matter (OM) is made. The Wufeng-Longmaxi shales have higher total pore volumes, surface areas and porosity than the Niutitang shales and OM pores are the main pore types in both shales. With the thermal maturity (Ro) increases, the OM porosity decreases. Combined with literature results, it is further proved that the evolution of OM pores was related to the gas generation with increasing thermal maturity. Compared with Niutitang shales, the lower thermal maturity of Wufeng-Longmaxi shales is beneficial for preserving OM pores and providing better connectivity. It can be concluded that the thermal maturity is the main controlling factor on the development of OM pores, which are important for the shale gas generation and preservation.
引用
收藏
页数:14
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