海洋可控源电磁与地震资料二维构造联合反演方法研究

Marine Controlled-Source Electromagnetic (CSEM) data is sensitive to the electrical difference of reservoirs and can effectively identify whether oil or water is contained. Seismic data is of high resolution and can recover the seafloor structure in a more accurate way. Integration of marine CSEM and seismic data can combine their advantages and can effectively improve the reliability of reservoir evaluation. Based on former work of separate inversion, we will realize joint 2D inversion of marine CSEM and seismic data. The resistivity and velocity are linked by the cross-gradient or JTV (Joint Total Variation) structural coupling functional on optimized inversion grid. We also use the joint inversion program developed to interpret the field data of Black Sea. This research is a hot topic and can be widely used for both research and industry purposes.

海洋可控源电磁法（CSEM）对油气藏电性差异敏感，可有效识别储层是含油气还是含水，地震勘探方法具有较高的分辨率，可以较好地描述地下地质构造特征，综合利用海洋CSEM法和地震勘探方法，开展联合反演方法研究可以充分利用这两种地球物理方法的优势，提高对油气藏的识别能力。在实现海洋CSEM和地震数据单独反演的基础上，通过交叉梯度（cross-gradient）和JTV（Joint Total Variation）方法构建出构造耦合函数，将电阻率和速度这两种物性参数联系起来，实现这两种地球物理资料的二维构造联合反演，并使用黑海地区实际数据对所开发的联合反演程序进行测试。本研究拟进行的海洋CSEM与地震资料联合反演研究是国际地球电磁界的研究前沿和热点之一，具有良好的应用前景。

本项目基于构造耦合函数将速度和电阻率这两种不同的物性参数联系起来，开发了一种海洋可控源电磁法（CSEM）和地震数据二维联合反演新算法。该联合反演算法综合了地震和电磁方法各自的优势，克服了单一方法的不足，提高了对地下目标体的成像精度。反演测试验证了算法及程序的正确性和有效性。该联合反演算法可应用于海洋油气、矿产、天然气水合物等资源勘探以及海洋目标体的探测，具有良好的应用前景。