| 河南义马地区页岩气储层孔隙非均质性 |
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| 引用本文：张晓波,左兆喜,张超,司庆红,张义.2016.河南义马地区页岩气储层孔隙非均质性[J].地球学报,37(3):340-348. |
| DOI：10.3975/cagsb.2016.03.11 |
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| 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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| 中文摘要:运用高压压汞、液氮吸附及渗透率测试等实验, 利用极差、突进系数、变异系数等参数, 表征煤系页岩孔渗特征及孔隙层间非均质性, 分析孔隙层间非均质性主控因素。结果表明: 河南义马地区上、下石盒子组泥页岩微孔与小孔较为发育, 山西组大孔较为发育, 分别提供了气体吸附附着面积和储存运移空间; 上石盒子组孔容与孔径相对偏差最小, 孔隙分布均匀, 山西组比表面积相对偏差最小, 表面积分布均匀; 随围压增大, 渗透率不断降低, 且满足负指数相关关系; 渗透率级差、突进系数和变异系数显示下石盒子组渗透率非均质性较弱, 山西组渗透率非均质性很弱, 更易于压裂开发。非均质性宏观上主要受沉积物质组成和构造改造作用影响, 微观上受成岩演化影响。 |
| 中文关键词:煤系页岩气储层 孔隙结构 非均质性 河南义马地区 |
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| Interlayer Heterogeneity in Pore Structure of Shale Gas Reservoir in the Yima Area, Henan Province |
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| Abstract: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. |
| keywords:shale gas reservoir of coal-bearing pore structure heterogeneity Yima area in Henan |
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