井震约束的广域电磁数据反演及其在保靖页岩气储层评价中的应用  

The Inversion of the Wide Field Electromagnetic Measurements with Well Logging and Seismic Constraints and Its Application to Evaluation of Shale Gas Reservoir in Baojing Area

作　　者：王延忠 沈金松[2,3] 周正武 符超 路肖尧 

机构地区：[1]神华地质勘查有限责任公司,北京100083 [2]中国石油大学地球物理与信息工程学院,北京102249 [3]中国石油集团公司物探重点实验室,北京102249 [4]长江大学地球物理与石油资源学院,湖北武汉434023

出　　处：《工程地球物理学报》2016年第3期253-262,共10页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金(编号:41374141);国家重点基础研究发展计划(973计划)(编号:2013CB228605)

摘　　要：目的是研究一种井震约束的广域电磁数据反演方法,用以处理湖南保靖地区采集的广域电磁数据,获取地层电阻率反演结果,然后用以得到研究区的地层分布格架、断层展布特征和页岩储层的纵横向分布。文中所用的方法包括三个方面。首先,用测井数据标定地震资料,对二维地震剖面进行处理解释,得到地震层位和断层分布;然后,用地震层位结果建立初始电阻率分布模型,用测井分层电导率作为上下界约束,对广域电磁数据进行井震约束反演,得到研究区地下地层的电阻率分布;最后,对电阻率反演结果进行综合地质解释,建立页岩气储层的纵横向分布剖面,给出页岩气富集的有利分布位置。通过与3口测井及试气结果对比,初步证实了井震约束的广域电磁数据反演方法在保靖页岩气储层评价中的应用效果。The objective of the paper is to study the inversion of the resistivity distribution of subsurface formation from wide field electromagnetic measurements based on the well logging and seismic constraints,and the inversion results have been applied to the gas reservoir assessment in Baojing area,Hunan province.And the framework of the formationdistribution,the extent of the fault,and the shale formation have been obtained from the interpretation of the resisitivity inversion result.And the method applied in the paper includes three aspects.First,the seismic data were scaled and depth matching through well logging data,and the seismic sequences and faults were characterized with geological interpretation tool of the seismic processing system.Next,the inertial resistivity model was established based on the seismic sequences interpretation results and the wide field electromagnetic measurements were inverted for the formation resisitivity distribution under the upper and lower bounds of well logs.Finally,the resistivity distribution was interpreted geologically and provided the vertical and lateral distribution of the shale reservoir.By comparing with the gas test results and well logging data of 3boreholes,it is validated that inversion method of the wide field electromagnetic measurements with well logging and seismic constraints is effective and its application to the evaluation of the shale gas reservoir in Baojing area is sound.

关 键 词：井震约束 广域电磁数据 电磁场灵敏度计算 正则化反演 页岩气储层 

分 类 号：P631.3[天文地球—地质矿产勘探]