广域电磁法在南华北盆地长山隆起页岩气资源潜力评价中的应用

摘要

Using the Wide Field Electromagnetic Method,the authors ascertained the tectonic framework of the Changsan uplift area in southern North China basin.The relief and the burial depth of the basement,the main distribution of the strata in the work area were found out.The burial depth and the thickness of the low resistivity zone were determined so as to determine the favorable location of the shale layer.Interpretation results were verified by drilling recorder,and better geological achievement was gained.The results of the exploration provide very useful geological and geophysical information for the shale gas'target'and'dessert'area exploitation and show clearly the validity of the wide field electromagnetic method in detecting shale gas strata.%采用广域电磁法在南华北盆地长山隆起地区进行探测,基本查明了工作区内基底起伏、埋藏深度和地层在空间上的主要分布,揭示了低阻区域的埋藏深度和厚度,从而确定了寻找页岩层的有利地段,解释结果得到钻孔验证,取得了较好的地质效果.勘探成果为确定页岩气开采“靶区”和“甜点区”提供了极为有用的地质地球物理信息,同时验证了广域电磁法探测页岩气赋存地层的有效性.