论文部分内容阅读
相干属性是检测地下介质不连续性特征的主要参数之一,但倾斜地层会对相干属性产生干扰,故在计算相干属性时需要消除地层倾角的影响。传统的相干属性计算一般使用时域倾角扫描法来消除地层倾角的影响,但这种方法的精度受到采样间隔等因素的限制,并不能很好地消除地层倾角的影响。根据振幅谱具有不受地层倾角影响的特点,本文提出将预先定义的子数据体内的地震数据变换为振幅谱,再利用振幅谱构造协方差矩阵,协方差矩阵最大特征根与矩阵迹的比值作为子数据体中心点的相干值。利用振幅谱计算相干属性的方法能够较好地消除地层倾角的影响,而且可以使用不同频段的振幅谱计算相干体,具备多尺度相干体算法的特性。模型数据和实际地震数据的应用结果表明,振幅谱相干属性可以更好地消除地层倾角对相干属性的影响。
Coherent property is one of the main parameters to detect the discontinuity of underground media. However, the inclined stratum will interfere with the coherent property, so the influence of stratum dip should be eliminated when calculating the coherent property. However, the accuracy of this method is limited by the sampling interval and other factors, and can not well eliminate the influence of dip angle. According to the characteristics that the amplitude spectrum is not influenced by the dip of the formation, this paper proposes to transform the pre-defined seismic data in the sub-data into the amplitude spectrum, construct the covariance matrix by the amplitude spectrum, and use the ratio of the largest eigenvalue to the matrix trace of the covariance matrix as The coherence of the center of the sub-volume. The method of using the amplitude spectrum to calculate the coherence property can well eliminate the influence of the dip of the stratum, and can calculate the coherence body using the amplitude spectrum of different frequency bands and possess the characteristics of the multi-scale coherence algorithm. The application of model data and actual seismic data shows that the coherent property of amplitude spectrum can better eliminate the influence of dip angle on coherence properties.