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| Content Provider | Springer Nature Link |
|---|---|
| Author | Ma, Yong Zhong, NingNing Han, Hui Li, DaHua Zhang, Yi Cheng, LiJun |
| Copyright Year | 2014 |
| Abstract | Gas shales with a high gas content were drilled in the Lower Cambrian Lujiaping Formation in the northeastern Sichuan Basin, close to the Chengkou Fault in the Dabashan arc-like thrust fold belt. The equivalent vitrinite reflectance values of organic matters are over 4.0% R$_{o}$. The pore structures of the shales were investigated based on microscopy, field emission scanning electron microscopy (FESEM) observations, and low temperature N$_{2}$ adsorption analysis. The study suggests that cleavages, comprising clay minerals mixed up with organic matter and other insoluble residues, were developed in the rock layers. The clay minerals are directionally arranged, displaying a mylonitized texture. Abundant nanometer-size organic matter and clay mineral particles are well mixed in the cleavage domains, which developed the mylonitized pore system that consists of nanometer-size intergranular pore spaces, aggregate pore spaces in clay mineral flakes and pore network. This mylonitized pore system has high specific surface area, high methane adsorption capacity, and high capillary pressure, which collectively contributes to the preservation of shale gas in such a complex tectonic area. The discovery of the mylonitized pore structure in organic-rich shales may reveal a new mechanism of shale gas enrichment in complex tectonic areas with over-mature organic matter in the northeastern part of Sichuan Basin. |
| Starting Page | 3027 |
| Ending Page | 3034 |
| Page Count | 8 |
| File Format | |
| ISSN | 16747313 |
| Journal | Science in China Series D: Earth Sciences |
| Volume Number | 57 |
| Issue Number | 12 |
| e-ISSN | 18691897 |
| Language | English |
| Publisher | Science China Press |
| Publisher Date | 2014-10-10 |
| Publisher Place | Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | shale gas mylonitized texture pore structure Dabashan arc-like fold belt Lujiaping Formation Lower Paleozoic Earth Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences |
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