三维VTI介质初至波走时层析速度和各向异性参数建模方法研究

发布时间：2018-03-11 21:18

本文选题：VTI介质　切入点：走时层析　出处：《天然气地球科学》2017年11期 　论文类型：期刊论文

【摘要】：三维各向异性走时层析反演问题一直是地震数据处理中的难点,其核心是各向异性参数敏感核函数的建立和三维大规模数据的处理。基于球谐展开群速度表达式,计算走时关于各向异性参数的敏感核函数,引入整形正则化来处理大规模、不适定反问题,并利用共轭梯度法对垂直慢度、水平慢度和动校正慢度的参数化方法(第一种参数化方法)与Thomsen参数化方法(第二种参数化方法)进行反演,实现三维VTI介质初至波走时层析反演。理论模型和实际资料处理结果表明,与经典的Thomsen参数化方法相比,垂直慢度、水平慢度和动校正慢度的参数化方法,更有利于三维VTI介质走时层析速度反演和各向异性参数的建模,进一步提高了反演的精度,具有较好的应用前景。
[Abstract]:The inversion of 3-D anisotropic travel time tomography is always a difficult problem in seismic data processing. The core of the inversion is the establishment of anisotropic parameter sensitive kernel function and the processing of 3D large-scale data. The sensitive kernel function for anisotropic parameters is calculated and the orthotropic regularization is introduced to deal with the large-scale ill-posed inverse problem. The conjugate gradient method is used to solve the vertical slowness. The parameterization methods of horizontal slowness and NMO slowness (the first parameterization method) and the Thomsen parameterization method (the second parameterization method) are inversed. The theoretical model and practical data processing results show that compared with the classical Thomsen parameterization methods, the vertical slowness, horizontal slowness and NMO slowness are parameterized. It is more favorable to the inversion of the travel time tomography velocity of three-dimensional VTI medium and the modeling of anisotropic parameters. It further improves the accuracy of the inversion and has a good prospect of application.
【作者单位】：中国石油大学(华东)地球科学与技术学院;
【基金】：国家自然科学基金项目“基于石油勘探中地震面波信息的近地表参数反演方法研究”(编号:41374123);国家自然科学基金项目“基于微地震数据的致密油气储层裂纹演化分形特征研究”(编号:41504097) 国家科技重大专项项目“复杂目标多尺度资料高精度处理关键技术研究”(编号:2016ZX05006-002-03)联合资助
【分类号】：P618.13;P631.44

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