地震观测系统CRP面元内偏移距、方位角分析

Seismic Prospecting Field Setup CRP Surface Element Offset and Azimuth Analysis

通过对地震观测系统设计及CRP面元的分析,获得了不同观测系统及覆盖次数下CRP面元内偏移距与方位角的分布情况。研究表明:对于满36次覆盖面元内的偏移距与方位角来说,8线10炮观测系统较8线8炮分布更为均匀,偏移距信息与宽方位角信息缺失较少,有利于进行岩性勘探。对于8线10炮同一观测系统,24次覆盖较36、48次覆盖其方位角分布均匀,但缺失大角度道集;而48次覆盖偏移距信息更为均匀丰富,却存在小角度道集缺失的情况。盲目的增加覆盖次数将会降低地震资料的分辨率,影响地震资料的构造解释。

Through seismic field setup design and CRP surface element analysis have obtained CRP surface element offset and azimuth distribution situation under different field setups and folds.The study has demonstrated that： for 36 folds surface element offset and azimuth,distribution of 8 lines 10 shots field setup will be more even than that of 8 lines 8 shots,less deficient of offset and wide azimuth information,thus propitious to lithologic prospecting.For a same field setup of 8 lines and 10 shots,azimuth distribution of 24 folds is more even than 36 and 48 folds,but deficient in large-angle gathers;offset information of 48 folds is more even and abundant,while deficient of small-angle gathers existed.Mindlessly increasing folds will lower down seismic data resolution and impact structural interpretation.