CMP属性空间连续性问题分析

CMP attribute spatial continuity analysis

在分析、处理地震试验资料时,需要特别关注在处理、分析过程中是否使原有的CMP属性空间分布连续性受到破坏。只有经分析证实抽道后CMP属性在空间的分布没有产生不连续现象,才能确保所对比的结果真实、可靠。文中探讨了地震道间对比分析处理中容易出现的CMP属性空间分布不连续现象的产生原因及消除方法,认为:炮间距不为抽道后道间距的整数倍、野外特观设计、抽道后炮点两边排列所对应的CMP点不重合是产生CMP属性空间分布不连续现象的原因,在地震道间距对比处理分析时,通过调整炮点两端排列的抽道顺序,或在定义观测系统以后,直接按对比面元尺寸抽取面元,可消除CMP属性空间分布不连续现象。实例分析表明,采用文中方法可消除CMP属性不连续现象。

When processing and analyzing seismic test data which is related to geophone interval, special attention is needed to pay if the CMP attribute spatial continuity is damaged during the processing process. Only the spatial distribution of CMP attribute after sorting is confirmed not to be distorted, the reliability of correlation results can be assured. In this paper the causes and removal method for the discontinuity of the CMP attribute spatial distribution were discussed, it is believed that the three factors (shot to receive distance not being the integer multiple of geophone interval after sorting, designed shot to receiver distance not being the integer multiple of geophone interval and CMPs for both spread of the shotpoint not being duplicate after sorting) cause the discontinuity of the CMP attribute spatial distribution. Adjusting sorting order for both spreads of the shotpoint when conducting correlation and analysis for seismic geophone interval or directly sorting bins based on bin size after defining geometry could remove the discontinuity of the CMP attribute spatial distribution. The field data analysis results show that the method recommended in this paper works quite well so that the discontinuity of the CMP attribute spatial distribution can be removed.