Abstract: Sandstone reservoir intercalated in coal-bearing series with medium is characterized by low content of carbonate cement,high content of siliceous cement and rich kaolinite in clay minerals.In the influence of various diagenesis,especially compaction and siliceous cementation,the sandstone reservoir of Permian-Carboniferous coal-bearing system in Northern China is the type of low porosity and permeability.Its pore type is mainly second pores.Epidiagenesis is the mainly factor to form good sandstone reservoir.The study of the tectonic history of Permian Carboniferous system in Northern China shows that there were two uplifts from Indo-Sinian to late Yanshanian epoch,the sandstone were subjected to weathering and leaching,the minerals such as feldspar were commonly dissolved,lots of secondary pores were developed,so the reservoir property is improved.The development of secondary pores of zone is closely related to erosion interface (unconformity),the far from the erosion surface,the low porosity is.

Key words: coal-bearing series, sandstone reservoir, acid water medium, epidiagenesis, model

摘要： 煤系地层的砂岩中所含水介质呈酸性,致使其砂岩储层具有碳酸盐胶结物含量低、硅质胶结物含量高、粘土矿物中富含高岭石的显着特点.由于各种成岩作用,特别是压实作用和硅质胶结作用的影响,使得华北石炭-二叠系煤系地层的砂岩储层属于低孔低渗型,其孔隙类型主要为次生孔隙.表生成岩作用是形成良好储层的主要作用.华北石炭-二叠系构造演化史的研究表明,在印支期及燕山晚期该区有两次抬升,使砂岩遭受风化和淋滤,长石等矿物溶解形成大量次生孔隙,储集性得到改善.其有利孔隙带的分布与不整合面有密切关系,孔隙率随着远离侵蚀面而变小.

关键词: 煤系地层, 砂岩储层, 酸性水介质, 表生成岩作用, 模式