首页|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

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

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容城地热田雾迷山组是华北地区典型的低孔隙度碳酸盐岩热储层,也是地热流体勘探的主要目标.裂缝对研究区地热流体的富集和产能有重要影响.本文通过对研究区岩心、薄片和成像测井等资料的分析,确定了裂缝的发育特征、控制因素和形成期次.结果表明容城地热田雾迷山组碳酸盐岩热储层裂缝多为未充填的高角度斜交缝,11.8%的裂缝被方解石和石英脉充填.裂缝开度主要集中在0～2 mm,靠近断裂的D19井开度最大(均值为3.65 mm),孔隙度也最大(均值为0.7523%),裂缝孔隙度随开度的增大线性增加.裂缝在断裂附近或者构造应力场较大的区域更为发育,受构造作用影响最明显.在同一构造环境和应力场下,岩性是控制研究区裂缝发育的主导因素.容城地热田雾迷山组碳酸盐岩热储层裂缝大致分为3组,印支期形成的NNE-SSW与NW-SE向"X"型共轭剪裂缝,燕山晚期形成的NEE-SWW向剪裂缝,以及喜马拉雅期形成的近E-W向张裂缝.
Mechanism of fracture genesis and significance of geothermal exploration in the carbonate reservoir of Wumishan Formation in Rongcheng geothermal field,North China
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.

Carbonate reservoirFracture characteristicFormation periodControlling factorWumishan Formation

张庆莲、朱喜、马宝军、马晓静、陈超、杨克基

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河北地质大学,河北省战略性关键矿产资源重点实验室 石家庄 050031

河北地质大学地球科学学院 石家庄 050031

中国地质科学院水文地质环境地质研究所 石家庄 050061

自然资源部地热与干热岩勘查开发技术创新中心 石家庄 050061

中国地质大学(武汉)环境学院 武汉 430074

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碳酸盐岩热储层 裂缝特征 形成期次 控制因素 雾迷山组

国家重点基础研究发展计划(973计划)国家自然科学基金河北省自然科学基金中国地质科学院项目河北地质大学博士启动基金

2021YFB150740042272350D202104041YK202309BQ2016002

2024

10.12017/dzkx.2024.028

地质科学
中国科学院地质与地球物理研究所

地质科学

CSTPCD北大核心
影响因子：0.79
ISSN：0563-5020
年,卷(期)：2024.59(2)
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