Analysis of geological effects on methane adsorption capacity of continental shale: a case study of the Jurassic shale in the Tarim Basin, northwestern China

被引:11
|
作者
Gao, Xiaoyue [1 ,2 ]
Liu, Luofu [1 ,2 ]
Jiang, Fujie [1 ,2 ]
Wang, Ying [1 ,2 ]
Xiao, Fei [1 ,2 ]
Ren, Zeying [1 ,2 ]
Xiao, Zhengyang [1 ,2 ]
机构
[1] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing, Peoples R China
[2] China Univ Petr, Basin & Reservoir Res Ctr, Beijing 102249, Peoples R China
关键词
geological effects; methane adsorption capacity; continental shale; Lower-Middle Jurassic; Tarim Basin; China; NORTHEASTERN BRITISH-COLUMBIA; CRETACEOUS GAS SHALES; GORDONDALE MEMBER; PORE STRUCTURE; BOWEN BASIN; COAL; SORPTION; RANK; VOLUME; SIZE;
D O I
10.1002/gj.2706
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Jurassic shale is an important source rock for the found gas reservoirs in the Tarim Basin, northwestern China, but has never been researched for shale gas potential. The geological effects on methane adsorption capacity for the gas shale have been investigated in this paper through the geochemical, mineralogical and adsorption analyses on samples from wells and sections. The methane adsorption capacity ranges from 0.58 to 16.57 cm(3)/g, and the total organic carbon (TOC) content is between 0.5 and 13.5 wt%. The organic maturity measured by T-max is between 410 degrees C (immature) and 499 degrees C (overmature). The methane adsorption capacity of the Jurassic continental shale in the Tarim Basin is affected by many geological factors, including the TOC content, organic matter maturity, mineral composition, surface area and pore size distribution. The TOC content is the most significant factor with a positive effect on the adsorption capacity of the Jurassic shale, and the influence varies piecewise according to the TOC content. The TOC content contributes much more to the methane adsorption capacity of organic-rich shale samples (TOC content>0.7 wt%) than to the organic-lean samples (TOC content<0.7 wt%). The mineral composition is a secondary factor, and the abundance of clay content has a positive effect on the methane adsorption capacity despite its relatively weaker adsorption ability compared to TOC. The pore size distribution has different effects on surface area and pore volume. Mesopores and micropores provide the major surface area and are mainly derived from TOC and illite, which has a positive influence on the adsorption capacity. Mesopores and macropores offer the major pore volume and are mainly formed by illite, which is the major contributor for pore volume rather than surface area. In addition, the TOC and illite contents of the Jurassic shale in the Tarim Basin are closely related to the origin, maturity and diagenesis evolution of the shale: (1) both TOC and illite content variations are related to the different provenances and depositional environments of shale; (2) the decrease of TOC content with increasing maturity is also partly attributed to hydrocarbon generation; and (3) the increase of illite content with increasing maturity is due to illitization in the diagenesis of shale. Copyright (C) 2015 John Wiley & Sons, Ltd.
引用
收藏
页码:936 / 948
页数:13
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