地质科学2024，Vol.59Issue(2)：388-403,16.DOI:10.12017/dzkx.2024.028
容城地热田雾迷山组碳酸盐岩热储层裂缝主控因素及成因机制
Mechanism of fracture genesis and significance of geothermal exploration in the carbonate reservoir of Wumishan Formation in Rongcheng geothermal field,North China
摘要
Abstract
The Wumishan Formation in the Rongcheng geothermal field is a typical low-porosity carbonate thermal reservoir in North China and a major target for geothermal fluid exploration.The fractures have an important influence on the enrichment and productivity of geothermal fluids in the study area.Based on the analysis of core,thin section and imaging logging data,the development characteristics,controlling factors and formation period of the fractures were determined.The fractures in the carbonate thermal reservoir of the Wumishan Formation in the Rongcheng geothermal field are mostly unfilled high-angle oblique fractures,and 11.8%of the fractures are filled with calcite and quartz veins.The fracture aperture is mainly concentrated in 0～2 mm,with the maximum average value of 3.65 mm in borehole D19 near the fault,and the maximum average value of 0.7523%porosity.The fracture porosity increases linearly with the increase of fracture aperture.Fractures develop near faults or in areas with large tectonic stress fields,and lithology is the dominant factor controlling fracture development in the study area under the same tectonic environment and stress field.The fractures in carbonate reservoirs of the Wumishan Formation in the Rongcheng geothermal field can be roughly divided into three groups:the NNE-SSW and NW-SE oriented shear fractures formed in Indosinian,NEE-SWW oriented shear fractures formed in the Late Yanshanian,and nearly E-W oriented tensile fractures with the latest development,which were formed in the Himalayan period.关键词
碳酸盐岩热储层/裂缝特征/形成期次/控制因素/雾迷山组Key words
Carbonate reservoir/Fracture characteristic/Formation period/Controlling factor/Wumishan Formation分类
天文与地球科学引用本文复制引用
张庆莲,朱喜,马宝军,马晓静,陈超,杨克基..容城地热田雾迷山组碳酸盐岩热储层裂缝主控因素及成因机制[J].地质科学,2024,59(2):388-403,16.基金项目
国家重点基础研究发展计划项目(编号:2021YFB1507400)、国家自然科学基金项目(编号:42272350)、河北省自然科学基金项目(编号:D202104041)、中国地质科学院资助项目(编号:YK202309)和河北地质大学博士启动基金项目(编号:BQ2016002)资助 （编号:2021YFB1507400）
