广域电磁法在武陵山区页岩气勘探中的探索应用——以黔北桐梓地区为例  

The application of wide field electromagnetic method to shale gas exploration in Wuling Mountain area:A case study of Tongzi area in northern Guizhou

作　　者：李帝铨[1,2,3] 汪振兴 胡艳芳 王涵[1,2,3] 苏煜堤 LI Di-Quan;WANG Zhen-Xing;HU Yan-Fang;WANG Han;SU Yu-Di(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory of Metallogenic Prediction of Nonfer-rous Metals and Geological Environment Monitoring(Central South University),Ministry of Education,Changsha 410083,China;Key Laboratory of non-ferrous and geological hazard detection,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]有色金属成矿预测与地质环境监测教育部重点实验室(中南大学),湖南长沙410083 [3]有色资源与地质灾害探测湖南省重点实验室,湖南长沙410083

出　　处：《物探与化探》2020年第5期991-998,共8页Geophysical and Geochemical Exploration

基　　金：国家重点研发计划项目(2018YFC0807802);国家自然科学基金面上项目(41874081)。

摘　　要：武陵山区具备巨大的页岩气资源潜力,但该区地质构造复杂,地形起伏剧烈,大面积碳酸盐岩出露,油气勘探不适于使用以地震勘探为主的传统物探方法。本次采用广域电磁法在黔北桐梓地区开展页岩气勘探,克服了地形、碳酸盐岩和构造复杂的影响,查明了桐梓地区从EN—WS呈"凹隆相间"的构造格局,落实了目的层五峰—龙马溪组的空间展布特征,圈定出4处页岩气勘探有利区,有望助力实现武陵山区页岩气勘探开发由点到面的突破。After the major breakthrough in oil and gas was obtained from the Well Anye 1,the Ministry of Natural Resources increased the residual shale gas and oil and gas exploration and development of 7,800 square kilometers in the Wuling Mountain.The Wulong Mountain area has complex geological structures,undulating terrain and large areas of carbonate rock,which has led to great challenges to traditional oil and gas exploration methods based on seismic exploration.Wide field electromagnetic method has the characteristics of green,high efficiency and low cost,and hence has become one of the powerful methods for oil and gas exploration and is now being widely used in shale gas exploration in southern China.It is a favorable method for shale gas exploration in southern China.The strata in Tongzi Guizhou are relatively stable,and the organic carbon content in the upper Ordovician Wufeng-Lower Silurian Longmaxi Formation is high.Through surface sample collection and well logging data analysis,the organic shale in this formation shows obvious low resistivity characteristics,which has the physical conditions of electromagnetic exploration.The wide field electromagnetic method was used to carry out shale gas exploration in Tongzi area of northern Guizhou,which overcame the complex influence of topography,carbonate rocks and structure.It is found that the structure pattern of Tongzi area is characterized by"depression and uplift"from northeast to southwest.The spatial distribution characteristics of the Wufeng-Longmaxi Formation in the target layer were detected,and four favorable areas for shale gas exploration were delineated.The prediction of shale gas exploration target area by wide area electromagnetic method is expected to help realize the breakthrough of shale gas exploration and development from point to surface in Wuling Mountain area and promote the development of clean energy industry along the river.

关 键 词：广域电磁法 页岩气 武陵山区 五峰—龙马溪组 

分 类 号：P631[天文地球—地质矿产勘探]