时移地震数据空间偏差校正方法

时移地震油藏监测技术是直接确定剩余油分布的关键技术之一.针对时移地震油藏监测在国内的需求及推广应用难点,研究了时移地震数据空间偏差校正处理方法.由于在观测系统、采集方向的处理参数等方面的差异,导致地下同一反射点在不同时移地震数据偏移后空间位置存在差异,产生与油藏变化无关的地震差异,增加数据解释的难度和风险.通过对参考数据与监测数据三维空间内的局部数据体的三维相关计算,确定监测数据体在x方向、y方向和时间方向上最佳移动量,从而实现两次地震数据空间位置差异校正.实际时移地震数据处理试验结果分析表明,空间偏差校正处理方法在消除时移地震数据三维空间非线性空间偏差方面是有效的.

A STUDY OF SPATIAL DIFFERENCE CORRECTION FOR TIME-LAPSE SEISMIC DATA

Time-lapse seismic reservoir monitoring technology is one of the most important technologies that can determine the distribution of residual oil directly.Spatial difference correction for time-lapse seismic data was studied in this paper,aiming at solving the difficulties in the demand and application of time-lapse seismic reservoir monitoring technique in China.Spatial position difference for the same reflection point in different migrated sections caused by the differences in geometry and acquisition orientation results in unreasonable time-lapse seismic data difference,which increases the difficulty and risk of time-lapse seismic interpretation processing parameters.The optimal shifts in x,y and time directions are calculated by 3D cross-correlation between local data volumes from reference data and monitor data.And then the spatial position difference correction can be conducted for monitor seismic data.The comparison and analysis of real time-lapse seismic data indicate that time-lapse seismic spatial difference correction is effective in decreasing 3D nonlinear spatial difference of purposeless repeated acquisition time-lapse seismic data.