摘要
雄安新区碳酸盐岩岩溶热储是具有重大开发潜力的优质地热资源。理清雾迷山组储层中岩溶裂隙的形成演化过程及发育特征,对地热资源的形成与聚敛研究具有重要作用,也是合理有效地开发地热资源的前提。根据岩芯采样、薄片、钻井、测井等资料,对雾迷山组岩溶裂隙的形成演化与几何特征进行了详细分析。结果表明:雄安新区岩溶和裂隙的形成与构造活动密切相关,以印支运动晚期至喜马拉雅运动期间最为强烈,形成了最有利储层发育的岩溶裂隙。雾迷山组裂隙带平均厚度和平均间隔分别为4.70m和4.05m,储厚比平均为41.90%。储层内部裂隙的走向主要为近北东向,倾角集中在50°~90°之间。面积裂隙频率达到5.34条/m^2。裂隙的长度和开度平均分别为1.20m和95.16μm。多种物质充填裂隙,以白云石、黄铁矿、石英最为常见,含有数量较多的半充填和未充填裂隙。现今地应力有助于裂隙的开启,储层中裂隙网络发育,连通性好,具有非常好的导水储水性能,为雾迷山组地热资源富集提供了良好条件。
The carbonate rock karst thermal reservoir in the Xiong’an New Area is a high-quality geothermal resource with significant development potential.Clarifying characteristics of the formation,evolution and development of karst fractures in the Wumishan Formation reservoir plays an important role in studying the formation and accumulation of geothermal resources,and is a prerequisite for the rational and effective exploitation of geothermal resources.Based on previous studies,the formation process of the Wumishan Formation,and geometric features of the karst fractures have been analyzed in detail based on data from outcrops,core sampling,rock slices,drilling,and well logging.The results show that the formation of karst and fractures in the Xiong’an New Area is closely related to tectonic activities,especially during the period from the late Indosinian movement to the Himalayan movement.During this period,the most favorable karst was formed.The average thickness and average interval of fracture zones are 4.70 m and 4.05 m,respectively,and the average proportion of reservoir thickness is 41.90%.The trend of internal fractures in the reservoir is mainly north-east and the dip angle is mainly between 50°and 90°.The fracture frequency per area is 5.34 pieces/m^2.The average length and opening of fractures are 1.20 m and 95.16μm,respectively.There are many types of filling materials in fractures,with dolomites,pyrites and quartzs being the most common.The formation contains lots of semi-filled and unfilled fractures.Present ground stress helps to open fractures,and the fracture network is developed in the reservoir with good connectivity,which has a very good water-conducting and water-storing performance and provides good conditions for the enrichment of geothermal resources in the reservoir.
作者
唐博宁
朱传庆
邱楠生
崔悦
郭飒飒
陈驰
TANG Boning;ZHU Chuanqing;QIU Nansheng;CUI Yue;GUO Sasa;CHEN Chi(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing,102249;College of Geosciences,China University of Petroleum,Beijing,102249)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2020年第7期2002-2012,共11页
Acta Geologica Sinica
基金
国家重点研发计划项目(编号2018YFC0604302)资助的成果。
关键词
雄安新区
雾迷山组
岩溶裂隙
形成过程
几何特征
The Xiong’an New Area
The Wumishan Formation
karst and fractures
formation and evolution
geometric characteristics
