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首页> 外文期刊>Fuel >Pore structure variations across structural deformation of Silurian Longmaxi Shale: An example from the Chuandong Thrust-Fold Belt
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Pore structure variations across structural deformation of Silurian Longmaxi Shale: An example from the Chuandong Thrust-Fold Belt

机译：志留系龙马溪组页岩结构变形过程中的孔隙结构变化-以川东逆冲褶皱带为例

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摘要

Pore types and pore size vary systematically across structural deformation in the shale gas reservoirs but lack a comprehensive study. Twelve Longmaxi Shale samples spanning a tectonism range from undeformed to deformed were formed in the structural deformation zone located in a field section of the Chuandong Thrust-Fold Belt, South China. Herein, pore structure investigations are performed using three types of organic-rich shale (undeformed shale, fault-related shale, and fold-related shale) with vitrinite reflectance (Ro value) ranging between 1.90 and 2.57% and total organic carbon (TOC) content ranging between 2.25 and 4.40%. Compared to the undeformed shales, deformed samples are quartz rich and carbonate poor. Total porosity from mercury intrusion porosimetry (MIP) ranges between 3.74 and 5.62% in undeformed shales, 2.66-6.83% in fold-related shales, and 2.55-13.92% in fault-related shales. Scanning electron microscopy (SEM) study of the pore type evolution reveals organic matter (OM) pores are dominant in undeformed shales whereas the interparticle (interP) pores, intraparticle (intraP) pores, micro-channels, and micro-fractures are more developed in both fold- and fault-related shales. A combination of low-pressure gas (N-2 and CO2) adsorption and MIP techniques suggests that with increasing structural deformation, micropore volumes relatively increase in fold- related samples, while macropore volumes significantly increase in fault-related shales. These observations and experiments confirm that tectonism produces an open and interconnected pore network within organic-rich shale, which is not related to OM pores. The role of structural deformation during ductile folding and brittle sliding, both in changing the mineral composition and in the producing process of the new pore networks, may be critical to understanding tectonism on organic-rich shales. These data could provide important theoretical guidance and scientific basis for the exploration and development of shale gas and resources assessment in the complex tectonic area of South China.
机译：页岩气储层结构变形过程中，孔隙类型和孔径大小发生系统性变化，但缺乏全面的研究。在华南川东冲断褶皱带田间构造变形带中形成了十二个Longmaxi页岩样品，其构造构造范围从未变形到变形。在此，孔隙结构研究使用三种类型的富含有机质的页岩（未变形的页岩，断层相关的页岩和褶皱相关的页岩），镜质体反射率（Ro值）在1.90％至2.57％之间，总有机碳（TOC）含量在2.25％至4.40％之间。与未变形的页岩相比，变形的样品富含石英，而缺乏碳酸盐。压汞法测得的总孔隙度在未变形页岩中为3.74％至5.62％，在褶皱相关页岩中为2.66-6.83％，在断层相关页岩中为2.55-13.92％。扫描电子显微镜（SEM）对孔隙类型演变的研究表明，有机质（OM）孔隙在未变形的页岩中占主导地位，而颗粒间（interP）孔隙，颗粒内（intraP）孔隙，微通道和微裂缝则更为发达。与褶皱和断层有关的页岩。低压气体（N-2和CO2）吸附和MIP技术的结合表明，随着结构变形的增加，褶皱相关样品中的微孔体积相对增加，而断层相关页岩中的大孔体积则显着增加。这些观察和实验证实，构造运动在富含有机质的页岩中产生了一个开放且相互联系的孔隙网络，这与OM孔隙无关。韧性折叠和脆性滑动过程中的结构变形在改变矿物成分和新孔隙网络的生产过程中的作用，对于理解富含有机物的页岩的构造学可能至关重要。这些数据可为华南复杂构造地区页岩气资源开发与评价提供重要的理论指导和科学依据。

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