宁武盆地构造演化及页岩气成藏

Tectonic evolution of Ningwu Basin and shale gas reservoir

 胡璐宇 2 朱炎铭 2 周晓刚 2

中国矿业大学资源与地球科学学院，江苏 徐州 221116 中国矿业大学煤层气资源与成藏过程教育部重点实验室，江苏 徐州 221008）

School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China MOE Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology, Xuzhou 221008, China)

 综合宁武盆地区域构造背景研究、野外地质调查结果及构造岩显微特征和组构分析，发现该盆地自中生代以来经历了印支期近S—N向挤压、燕山早—中期NW—SE向挤压、燕山晚期近E—W向挤压、四川期近S—N向挤压、喜马拉雅期近NEE—SWW向挤压等5期构造运动，最终形成了盆地边缘断裂及宁武向斜控制盆地构造的格局。同时，基于研究区野外实测剖面、采样及钻孔数据，分析得到石炭—二叠系目的层泥页岩厚度介于30~100 m，TOC介于0.12%~7.87%，Ro平均0.88%，发现目的层经历了5期沉积埋藏阶段和3期热演化阶段，对未来展开页岩气的勘探及开采具有一定的指导价值与经济意义。

 Based on the comprehensive regional tectonic background research on Ningwu Basin, field geological investigation results, tectonic microscopic characteristics, and fabric analysis, it shows that Ningwu Basin mainly has experienced five stages of tectonic movement since Mesozoic: nearly S-N compression of the Indosinian, the NW-SE trending compression of the early and middle Yanshan, nearly E-W compression of the Yanshan advanced stages, nearly S-N compression of the Sichuan, NEE￣SWW compression of the Himalayan, which finally formed the edge fault of the basin and the syncline structure control tectonic pattern of Ningwu Basin. According to the field observation, sampling, and drilling data of the study area analysis, the thickness of the shale from Carboniferous to Permian is between 30 m and 100 m, TOC ranges from 0.12% to 7.87%, the average maturity of organic 0.88%. The target layer mainly experienced five buried stages and three stages of thermal evolution, which shows guiding and economic senses for the exploration and exploitation of shale gas in the future.

10.6056/dkyqt201603004