| 河南义马地区页岩气储层孔隙非均质性 |
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| 关键词:shale gas reservoir of coal-bearing pore structure heterogeneity Yima area in Henan |
| 基金项目:中国地质调查局项目“华北地区页岩气基础地质调查与潜力评价”(编号: 12120114020301)和中国博士后科学基金第八批特别资助“煤系页岩气储层非均质性对可改造性控制的微观机理研究”(编号: 2015T80595) |
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| 摘要: |
| Interlayer Heterogeneity in Pore Structure of Shale Gas Reservoir in the Yima Area, Henan Province |
| The pore permeability of coal-bearing shale and the heterogeneity of the pore layer were characterized by using high-pressure mercury intrusion (HPMI), low-pressure nitrogen gas adsorption (LP-N2A) and pulse decaying permeability instrument (PDP). The main factors of heterogeneity between layers were analyzed. The results show that the micropores and mesopores of Upper and Lower Shihezi Formation shale are well developed, which provide attachment area and space for gas storage and transport. The macropores of Shanxi Formation are extensively developed, which provide space for gas storage. The relative error of pore volume and diameter of the Upper Shihezi Formation is very small, and the pore volume is distributed evenly. The relative error of specific surface area of Shanxi Formation is insignificant, the pore surface area is distributed evenly. With the increasing of confining pressure, the permeability constant is reduced, and meets the negative exponential relationship. The Lower Shihezi Formation has comparatively large differential, onrush and variation coefficient of permeability, which shows weak heterogeneity, and the Shanxi Formation with the weakest heterogeneity is considered to be easily developed. The macro heterogeneity is mainly affected by the sedimentary composition and tectonic reworking, while the micro heterogeneity is affected by diagenetic evolution. |
| ZHANG Xiao-bo,ZUO Zhao-xi,ZHANG Chao,SI Qing-hong,ZHANG Yi.2016.Interlayer Heterogeneity in Pore Structure of Shale Gas Reservoir in the Yima Area, Henan Province[J].Acta Geoscientica Sinica,37(3):340-348. |
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