摘要
采用大地电磁测深和土壤氡气测量两种方法,圈定了冀中坳陷北部四级构造单元(大兴凸起、大厂凹陷、廊固凹陷、武清凹陷和杨村斜坡)的分布范围;查明了凹陷内部的五级构造潜山带(凤河营带、河西务带);厘清了控制坳陷内部凹凸结构的四级断裂,分别是大兴断裂、桐柏断裂、河西务断裂和宝坻断裂;控制凹陷内部构造潜山带的凤河营-西集断裂和杨税务断裂。根据冀中坳陷碳酸盐岩热储埋深大的特征和热源形成机制,确定热储探测采用"坳中找凸"和"凹中找潜山"的原则,同时需满足"源、通、储、盖"四个方面,结合大地电磁测深和土壤氡气测量综合成果,认为凤河营潜山带是钻探有利靶区,并有钻孔印证。另外,研究发现大地电磁测深和土壤氡气测量两种方法在反映深大断裂方面基本一致,起到相互印证的作用;大地电磁测深方法对高阻碳酸盐岩热储解释准确,基于一维反演作为初始模型的二维反演方法更适合冀中坳陷的凹凸相间构造格局的解释。
Based on the results of radon measurement and magnetotelluric in the northern Jizhong depression,this study identifies Quaternary tectonic units,the Daxing uplift,the Dachang Sag,the Langgu Sag,Wuqing Sag and Yangcun slope,and five-level tectonic buried hill zones,Fengheying buried hill and Hexiwu buried hill.It is found that the faults controlling the internal concave-convex structure of the depression are the Daxing fault,the Tongbai fault,the Hexiwu fault and the Baodi fault.Those controlling the internal buried hill of the sags are the Fengheying-Xiji fault and the Yangshuiwu fault.Based on the depth of carbonate thermal reservoir and the heat source formation mechanism in the Jizhong depression,we determine the principle of finding convex in depression and finding buried hill in concave.At the same time,it should meet four aspects,including source,channel,reservoir and cover.In combination with the comprehensive results of the magnetotelluric sounding and soil radon measurement,the Fengheying buried hill is the favorable target for hydrocarbon drilling,as was also verified by the boreholes.In addition,it is found that the magnetotelluric sounding and soil radon measurement show the same results in locating deep and large faults,thus verifying the results.Magnetotelluric sounding method is accurate in interpreting high resistivity of carbonate reservoir,and the two-dimensional inversion method based on one-dimensional inversion as the initial model is more suitable for the interpretation of concave-convex tectonic pattern in the Jizhong depression.
作者
苗青壮
王贵玲
邢林啸
张薇
周晓妮
王维强
MIAO Qingzhuang;WANG Guiling;XING Linxiao;ZHANG Wei;ZHOU Xiaoni;WANG Weiqiang(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,050061;Technology Innovation Center of Geothermal&Hot Dry Rock Exploration and development,Ministry of National Resources,Shijiazhuang,050061;Chinese Academy of Geological Sciences,Beijing,100037)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2020年第7期2147-2156,共10页
Acta Geologica Sinica
基金
中国地质调查局地质调查项目(编号DD20190555)
中国地质调查局中国地质科学院院控基金项目(编号JYYWF20181302)联合资助成果。
关键词
冀中坳陷
大地电磁测深
土壤氡气
潜山带
断裂
Jizhong depression
magnetotelluric sounding
soil radon
buried hill
fault
