内蒙古索伦—林西地区林西组泥页岩储层特征

Reservoir characteristics of mud shales from Upper Permian Linxi Formation in Suolun-Linxi area, Inner Mongolia

朱占平 张明杨 孙雷 刘杨 崔桐 代登亮

Zhu Zhanping Zhang Mingyang Sun Lei Liu Yang Cui Tong Dai Dengliang

吉林大学 地球科学学院, 长春 130061 2. 中国地质调查局 沈阳地质调查中心, 沈阳 110034 3. 中国石油 吉林油田分公司 勘探开发研究院, 吉林 松原 138000

College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China 2. Shenyang Geological Survey Center, China Geological Survey Bureau, Shenyang, Liaoning 110034, China 3.Research Institute of Petroleum Exploration and Development, Jilin Oilfield Company, PetroChina, Songyuan, Jilin 138000, China

内蒙古索伦—林西地区发育有较好生烃潜力的巨厚上二叠统林西组暗色泥页岩,泥页岩厚度高值带主要分布于官地—巴彦花—索伦一线的西北部,累厚可达911 m,单层最大厚度63 m。场扫描电镜、X-射线衍射分析等实验结果表明:林西组暗色泥页岩发育较多的脆性矿物,平均含量62.9%,最大可达70.8%;黏土矿物平均含量37.1%,最大可达41.5%;泥页岩中的微孔隙、微裂隙发育,孔隙类型以粒间孔隙和粒内孔隙为主,孔隙直径一般为1~3 μm,最大为8 μm;孔隙度平均为1.288%,最大为4.42%;基质渗透率平均为0.026 2×10-3 μm2,最大为0.275 8×10-3 μm2。与国内外已发现页岩气盆地相比,林西组泥页岩储层具有一定的页岩气储集条件,并具有可开发造缝的岩石学特征。推测区内查干淖尔—白音诺尔一线的西北地区是较为有利的目标区。

In the Suolun-Linxi regions of the Inner Mongolia, extensive mud shales with a good hydrocarbon potential occur in the Upper Permian Linxi Formation. The thickness of the mud shales reaches a peak in the northwest of the Guandi-Bayanhua-Suolun areas. The total thickness is up to 911 m, and the maximum thickness of a single layer is 63 m.Field scanning electron microscopy and X-ray diffraction show that the mud shales are rich in brittle minerals, with an average content of 62.9% and a maximum content of 70.8%. The average content of clay minerals is 37.1%, and the maximum content is 41.5%. Micro pores and micro cracks are common. The pores are mainly intergranular and intragranular ones, with an average diameter of 1-3 μm and the maximum diameter of 8 μm. The average and maximum porosities of the mud shales are 1.288% and 4.42%, respectively. The average and maximum permeabilities of the matrix are 0.026 2×10-3μm2 and 0.275 8×10-3μm2, respectively. Compared to the shale gas basins already found in China and abroad, the mud shales of the Linxi Formation are favorable for shale gas accumulation, and possess the petrological characteristics of development. In conclusion, the northwest of the Chagannaoer-Baiyinnuoer area has a good exploration potential.

国土资源部2013年度"索伦—林西地区油气资源选区调查"专项(1211302108019)资助.

https://doi.org/10.11781/sysydz201503354