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

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。

Estimates of Seismic Reflector Dip by Adaptive Weighted Generalized Inverse Vector Direction Filter

It's difficult to estimate a seismic reflector dip at discontinuities.Many seismic attributes such as reflector dip change fast at faults,geological boundaries and so on.To overcome this problem,we explored an adaptive weighted generalized inverse vector direction filter to smooth the gradient vector field to estimate a local seismic reflector dip.The method is as below:at first,to compute the gradient vector field by a modified finite-difference method;and then to set the reference direction to vertical downward and invert the opposite vectors to the reference direction;at last,to estimate the seismic reflector dip by the adaptive weighted generalized inverse vector direction filter.This method can estimate a seismic reflector dip robustly and efficiently with high-resolution at discontinuities,while the conventional methods may fail.Both of the synthetic and real data examples demonstrated the effectiveness and efficiency of our method for estimating seismic reflector dips with high-resolution.