测井约束的海洋CSEM反演及其在南黄海中部隆起区勘探应用  

Marine CSEM Inversion with Well Logging Constraints and Its Application in the Central Uplift of the South Yellow Sea

作　　者：朱宇启 裴建新[1,2,4] 段双敏 吴志强 ZHU Yu-Qi;PEI Jian-Xin;DUAN Shuang-Min;WU Zhi-Qiang(College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100, China;Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100 [3]中国地质调查局青岛海洋地质研究所,山东青岛266071 [4]青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2021年第6期70-77,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金面上项目(41974085);中央高校基本科研业务费专项项目(201964015)资助。

摘　　要：海洋可控源电磁法(Controlled-Source ElectroMagnetic,CSEM)对于油气储藏饱和度判别具有较高的敏感性,这为其用于油气储藏检测奠定了基础。但是海洋CSEM相较于地震勘探而言对异常体的垂向分辨率较低,这为海洋CSEM资料反演异常体垂向结构带来困难。由于测井数据具有垂向分辨率高的特点,蕴含丰富的电阻率和深度等信息,测井信息的引入可在一定程度上改善海洋CSEM资料垂向分辨率低的不足。将测井数据作为先验信息引入目标函数的模型加权矩阵中,引导反演的迭代方向,并根据测井信息对电阻率垂向变化区域进行局部细化,精细刻画细化区域的电阻率变化,进而提高海洋CSEM反演的垂向分辨率,逼近反演的最优解。在南黄海中部隆起区的应用中,对海洋CSEM实测数据进行测井约束反演,其结果表明,测井约束的海洋CSEM反演结果不仅呈现了地电断面的基本结构,而且还能突出垂向发生明显变化的层位,表现出较高的垂向分辨率。The marine controlled-source electromagnetic(CSEM)method is highly sensitive to oil and gas reservoir saturation,which lays the foundation for its application in the detection of oil and gas reservoir.However,compared with seismic exploration,marine CSEM has a lower vertical resolution to anomalous bodies,which brings difficulties to the inversion of the vertical structure from marine CSEM data.As the logging data has the characteristics of high vertical resolution and contains abundant information such as resistivity and depth,the introduction of logging information can improve the low vertical resolution of marine CSEM data to a certain extent.The well logging data is introduced into the model weighting matrix of the objective function as prior information to guide the iterative direction of the inversion,and according to the logging information,the vertical structure is locally refined to describe the variation of resistivity accurately,thereby improving the vertical resolution of marine CSEM inversion and approaching the optimal solution of inversion.In the exploration application of the Central Uplift area of the South Yellow Sea,we performed well logging constrained inversion on the measured marine CSEM data.The result showed that the marine CSEM inversion with the well logging constraints not only presents the basic structure of the geoelectric section,but also highlighted the layers with significant vertical changes,showing a higher vertical resolution.

关 键 词：海洋CSEM 测井约束 局部细化 垂向分辨率 南黄海 

分 类 号：P618.13[天文地球—矿床学]