摘要
地震波阻抗反演是油气储层预测的有效手段,已在工业界得到了广泛应用.尽管该项技术已十分成熟,但仍然面临病态性强、横向连续性差、和分辨率低的问题.前人提出的构造导向正则化可以在最小二乘反演过程中有效减轻病态性,并增强反演结果的横向连续性,但它无法充分保护地层边界甚至可能对断层等不连续性信号造成损伤.为了增强反演算法对构造细节的刻画能力,突出波阻抗模型的“块状”特征,我们在反演迭代过程中引入保边滤波,并用一个权重参数控制模型更新的锐度.对于波阻抗模型中的每个采样点,保边滤波会在其周围寻找最均匀的窗口,并将该窗口内所有样点的平均值分配给该样点.这一处理可以保护尖锐界面不被模糊并显著提升反演结果的分辨率.模型测试和实际数据测试结果表明,本文方法可以显著提升对构造边界的刻画能力,并且在增强波阻抗反演结果的不连续性特征方面具有卓越的性能.
Seismic impedance inversion is an effective method for oil and gas reservoir prediction and has been widely used in industry.Although the technique is very mature,it still faces the problems such as strong ill posedness,poor lateral continuity,and low resolution.The structure-oriented regularization proposed by predecessors can effectively reduce ill posedness in the least-squares inversion process and enhance the lateral continuity of the inversion results,but it cannot fully preserve the geological boundaries and may even cause damage to discontinuous signals such as faults.In order to enhance the ability of inversion algorithms to depict geological structure details and highlight the“block”characteristics of the impedance model,we introduce edge-preserving filter during the inversion iteration process,and use a weight parameter to control the sharpness of model update.For each sampling point in the impedance model,edge-preserving filter searches for the most uniform window around it and assigns the average value of all samples within that window to that point.This processing can preserve sharp interfaces from blurring and significantly improve the resolution of inversion results.The results of model and field data testing show that the proposed method can significantly improve the ability to characterize the structure boundaries and has excellent performance in enhancing the discontinuity features of impedance inversion results.
作者
李娟娟
方金伟
俞缙
张元鹏
LI JuanJuan;FANG JinWei;YU Jin;ZHANG YuanPeng(State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;Engineering Innovation Center for Urban Underground Space Exploration and Evaluation,Ministry of Natural Resources of the People's Republic of China,Nanjing 210016,China;State Key Laboratory of Deep Earth Exploration and Imaging,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Tianjin 300300,China)
出处
《地球物理学进展》
北大核心
2025年第5期2028-2039,共12页
Progress in Geophysics
基金
国家自然基金地质联合基金重点支持项目(U2444220)
城市地下空间探测评价工程技术创新中心开放基金(USEEOS-2024-01)
中国矿业大学实验技术研究与开发项目重点项目(S2023D002)联合资助。
关键词
波阻抗反演
保边滤波
构造导向正则化
断层增强
高分辨率
Impedance inversion
Edge-preserving filter
Structure-oriented regularization
Fault enhancement
High resolution
