海上煤田三维地震资料处理方法研究
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摘要
龙口海域煤田,海水深度变化大(1~13 m),地层局部倾角陡;海上地震资料采集存在检波器位置漂移、变周期鸣震干扰以及子波差异大等问题。利用直达波或折射波旅行时进行检波器位置反演,解决了检波器飘移问题;变步长二步法预测反褶积能压制变周期鸣震干扰;叠前时间偏移解决了陡倾角成像。资料处理效果表明:所用方法对龙口海域地震资料具有较强的针对性。
There is big subsurface local obliquity and great variation in Longkou coal exploration area(from 1 to 13 meters).The seismic data suffers from the geophone wandering,variable cycle ringing and big wavelet difference.The geophone wandering problem is solved from 3D view through receiver position inversion using travel time of direct wave and refracted wave,the variable cycle singing is suppressed sufficiently via variable step-length two-step predictive deconvolution,and steep-dip imaging problem is solved by pre-stack time migration.The actual material process result affirmed the obvious effects of the seismic data processing methods mentioned in the article in the Longkou sea area.
There is big subsurface local obliquity and great variation in Longkou coal exploration area(from 1 to 13 meters).The seismic data suffers from the geophone wandering,variable cycle ringing and big wavelet difference.The geophone wandering problem is solved from 3D view through receiver position inversion using travel time of direct wave and refracted wave,the variable cycle singing is suppressed sufficiently via variable step-length two-step predictive deconvolution,and steep-dip imaging problem is solved by pre-stack time migration.The actual material process result affirmed the obvious effects of the seismic data processing methods mentioned in the article in the Longkou sea area.
引文
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