摘要
沁水盆地面积广阔,煤系地层游离气资源丰富,勘探至今,已在古生界的多套地层中发现了含气显示。从气测异常的探井分析入手,结合该区的构造演化史、热演化史等,确定深成变质与燕山期构造热事件叠加所引起的二次生烃是盆地游离气藏形成的主要气源,构造抬升导致的源储压差则是其主要运移动力。明确了煤系地层游离气的2类运移途径:一是宏观输导体系,主要包括断层、不整合面和陷落柱;二是微观输导体系,主要是煤岩和顶板致密砂岩中的微孔隙及微裂隙。据此指出了盆地内游离气聚集成藏的有利区带为南马会背斜带、北斗沟背斜带等。
Qinshui Basin was a large area,free gas resources was rich in coal-bed strata,after Years of exploration,several gas shows were found in Paleozoic strata of the Basin.Through the analysis of gas logging in the abnormal wells,combined with the research of structural evolution history and thermal evolution history in the basin,it was determined that the secondary hydrocarbon genesis caused by the superposition of deep burial metamorphism and thermal events in Yanshanian Period was the main gas resource for forming the reservoirs of free gas,the source pressure difference in the reservoir induced by structural lifting was the main power for migration.Tow ways of free gas migration in the coal-bed strata was determined:one was the macroscopic transporting system,which included faults,uncomformity surface and collapse column,the other was microscopic transporting system,which included the micro porosity and fractures in the coal rock and tight sandstone on the roof.Based on the study,it is pointed out that Nanmahui Anticlinal Belt,Beidougou Anticlinal Belt etc are the favorable area of free gas accumulation is the.
出处
《长江大学学报（自科版）（中旬）》
CAS
2015年第8期17-21,3-4,共5页
Journal of Yangtze University(Nature Science Edition)
基金
国家科技重大专项(2011ZX05033-004)
关键词
沁水盆地
煤系地层
游离气
运移途径
宏观输导体系
微观输导体系
Qinshui Basin
coal-bearing strata
free gas
migration way
macroscopic migration system
microscopic migration system
