基于自适应加权广义逆矢量方向滤波估计地震同相轴倾角

发布时间：2018-06-09 16:13

本文选题：地震倾角 + 矢量滤波　；参考：《吉林大学学报(地球科学版)》2018年03期

【摘要】：在断层等不连续位置处估计局部地震同相轴的方向较为困难。在断层、地质边界等处,同相轴不连续,结构不稳定,导致倾角等地震属性变化大。为了克服这个问题,本文提出一种自适应加权广义逆矢量方向滤波方法,通过光滑经过逆转的梯度矢量场来估计局部地震倾角剖面。计算过程是:首先由改进的梯度算子计算梯度矢量场;然后设置垂直向下为参考方向,对梯度矢量场进行逆转;最后通过自适应加权广义逆矢量方向滤波方法估计倾角剖面。自适应加权广义逆矢量方向滤波方法在不连续位置处具有传统倾角估计方法不具有的高分辨率,能够稳健高效地估计地震数据的倾角剖面。理论模型和实际地震资料处理得到的局部地震倾角剖面表明,所提出的方法能够高分辨率地保持构造细节信息。
[Abstract]:It is difficult to estimate the direction of local seismic cophase axis at discontinuous positions such as faults. At faults and geological boundaries, the cophase axis is discontinuous and the structure is unstable, which results in great changes in seismic attributes such as dip angles. In order to overcome this problem, an adaptive weighted generalized inverse vector directional filtering method is proposed to estimate the local seismic dip profile by smooth reversed gradient vector field. The calculation process is as follows: firstly, the gradient vector field is calculated by the improved gradient operator; then the gradient vector field is reversed by setting vertical downward direction as the reference direction; finally, the dip profile is estimated by adaptive weighted generalized inverse vector directional filtering method. The adaptive weighted generalized inverse vector directional filtering method has a high resolution which the traditional dip estimation method does not in the discontinuous position, and can estimate the dip profile of seismic data in a robust and efficient manner. The local seismic dip profile obtained from the theoretical model and the actual seismic data processing shows that the proposed method can maintain the structure detail information with high resolution.
【作者单位】：吉林大学地球探测科学与技术学院
【基金】：国家自然科学基金项目(41274120,41404085,41504084)~~
【分类号】：P631.4

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