SPS文件恢复与地震资料重处理

SPS file recovery and seismic data reprocessing

(1. 中国地质大学(北京),北京100012;2.中国地质大学(武汉),湖北武汉430074)

China University of Geosciences (Beijing),Beijing 100012,China

尼日利亚某工区原始地震资料缺失SPS文件中的炮检关系文件。正确恢复炮检关系是该工区地震资料处理的基础。在详细分析和筛选有限的野外原始资料的基础上,利用地震采集设计专业软件建立理论观测系统,重复模拟关系文件,并与处理软件结合,通过线性动校正、相邻炮点相似性鉴别、叠加剖面监控等手段,调整和验证炮点、检波点位置,最终准确恢复炮检关系。根据得到的炮检关系文件,重新处理了该工区地震资料,并将得到的偏移剖面与以前的处理剖面进行对比,结果表明此次处理效果较好,准确的炮检关系保证了同相叠加,提高了地震资料信噪比,改善了成像质量。

The shot-receiving relation file of SPS file for one block in Nigeria is absent.Correctly recovering shot-receiving relation file is the basis of seismic data processing.Based on detailedly analyzing and selecting limited raw field data,the relation file is repeatedly simulated via the construction of theoretical geometry with seismic acquisition design software.With the help of data processing software,location of shot points and receiver points are verified and adjusted by linear NMO correction,similarity between adjacent shotpoint gathers and stacking section.By the workflow,the relation file was accurately recovered.In terms of the obtained shot-receiving relation file,the seismic data of the block was reprocessed.Compared with the previously processed sections;the reprocessed migrated sections have better quality.Accurate shot-receiving relation ensures the stack of same phase,increases the S/N of seismic data and improves imaging quality.