太康隆起东段地热资源远景区调查评价与研究

应用大地电磁测深法(MT)对太康隆起东段深部地层结构及隐伏断裂进行探测研究,共布设了4条MT剖面,获得了97个测深点,并对所获得的MT数据的二维偏离度、构造走向等进行计算和分析,采用非线性共轭梯度(NLCG)二维反演方法对TE和TM模式的数据进行联合反演,得到了可靠的地下介质二维地电模型。研究结果表明,商丘凸起电性结构纵向上具有典型的分层特征,从上到下可分为三层,即低阻层-中高阻层-高阻层。根据该电性结构模型,结合研究区域重力、航磁、地震及区域地质资料,绘制了商丘凸起基岩地质图,同时根据深部基底隆起形成的高阻异常与区域地温场高值区具有较好的对应关系,据此圈定了2处地热异常远景区。

Investigation and evaluation of the geothermal resources prospective areas in Eastern region of Taikang uplift

In this paper the magnetotelluric(MT)method was applied to study the deep stratigraphic structure and concealed faults of in eastern region of Taikang uplift.Four MT profiles had been deployed which included 97 MT sites.The data processing and analysis include calculation of the 2D skewness and electric strike of the MT profile.By conducting NLCG 2D inversion on apparent resistivity and phase data of TM and TE mode,the reliable underground geoelectric models were obtained.From top to bottom,it can be divided into three layers:low resistivity layer,relatively high resistivity layer and high resistance layer.Geological map of basement rock were delineated according to this model as well as regional gravity,aero-magnetic,earthquake and geological survey.The study area of deep high resistivity anomalies and regional geothermal field in the high value area has good correlation,two places geothermal resources prospecting area were delineated.