摘要
四川南桐地区二叠系龙潭组煤系由一套含钙质、凝灰质的细屑岩、泥晶灰岩、硅质灰岩、泥质灰岩、钙质页岩及铝土质页岩组成。通过对该岩系的沉积岩石学、沉积相、近煤层和远离煤层的岩石微细孔隙、裂隙研究结果表明,此含煤岩系有一定的孔容含量,对瓦斯储集、运移比较有利,进而为煤层中瓦斯综合治理提供沉积背景资料和科学依据。
The late Permain longtan coal-bearing series in Nantong distrit, Sichuan Province, is composed of calcareous and tuffaceous lulite, micritic linestone, siliceous limestone, argillaceous shale, and aluminiferous shale.The coal-bearing series is 88.47m in thickness. Two main minable seams named coalbeds No. 4 and 6, are 3.18m and 1.63m in thickness, respectively. The coal-bearing formation consists of several small cycles which might represent frequent alternation of transgressive and regressive sedimentations. In ascending order each cycle is composed of mechanical, biochemical and coal deposits. The coal-bearing formation includes littoral beach, littoral swamp and peat-swamp facies. The present study on lithological characteristics and physical properties, especially the pore volume and the areal parameter of porosity of the cast thin-sections, of various rocks from top to bottom, and near or far from the seams, shows that the environmental conditions are good for gas forming, migrating reservoiring, and trapping, therefore, the gas reservoir in the coal seams in this district is abundant and then the gas burst is possi-ly more serious.
出处
《地质科学》
CAS
CSCD
北大核心
1992年第A12期190-200,共11页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家攻关项目"煤与瓦斯突出预测和治理研究"的部分成果
关键词
含煤岩系
岩石学
瓦斯运移
储集
petrology, gas migration, reservoir pore volume, areal porosity, diagenesis
