基于低频软约束的叠前AVA稀疏层反演

发布时间：2018-01-25 07:05

本文关键词： 稀疏层反演 AVO 协方差矩阵去相关低频软约束项　出处：《石油地球物理勘探》2017年04期 　论文类型：期刊论文

【摘要】：叠前AVA楔形字典利用基追踪分解算法实现叠前AVA稀疏层反演,较常规叠前反演具有较高的垂向分辨率,但由于该算法没有考虑弹性参数之间的相关性引起的不适定性,造成密度反演结果非常不稳定。为此,基于Zhang的常规叠前AVA稀疏层反演,结合Downton的参数协方差矩阵特征分解去相关思路,重新推导了叠前AVA楔形字典和叠前AVA稀疏层反演的目标函数;在此基础上,通过引入低频软约束项补偿反演的低频信息,可以获取全频带的反演结果,进一步降低了三参数反演的不适定性,提高了密度项的反演精度。模型数据和实际数据试算结果表明,基于低频软约束的叠前AVA稀疏层反演具有较高的稳定性和垂向分辨率。
[Abstract]:Prestack AVA wedge dictionary uses basis tracing decomposition algorithm to realize prestack AVA sparse layer inversion, which has higher vertical resolution than conventional prestack inversion. However, because the algorithm does not consider the ill-posed property caused by the correlation between elastic parameters, the density inversion results are very unstable. Therefore, the conventional prestack AVA sparse layer inversion based on Zhang is proposed. The objective functions of prestack AVA wedge dictionary and prestack AVA sparse layer inversion are rederived by using the eigenvalue decomposition of the parameter covariance matrix of Downton. On this basis, by introducing the low-frequency information of low-frequency soft constraint compensation inversion, the full-band inversion results can be obtained, and the ill-posed three-parameter inversion can be further reduced. The experimental results of model data and actual data show that prestack AVA sparse layer inversion based on low-frequency soft constraints has high stability and vertical resolution.
【作者单位】：中国石化石油勘探开发研究院;
【分类号】：P631.4
【正文快照】： 张丰麒,金之钧,盛秀杰,刘韬.基于低频软约束的叠前AVA稀疏层反演.石油地球物理勘探,2017,52(4):770-782.1引言叠前地震数据中包含了丰富的炮检距信息,借助叠前AVA反演可以从叠前地震数据中获取地下介质的多种弹性参数,可以定量表征储层岩性和孔隙流体的变化。叠前AVA反演的发

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