【摘要】 深水已经成为世界范围内油气勘探开发的热点领域.南海北部深水区石油地质条件优越,勘探潜力巨大.但由于陆坡区水深急剧变深,峡谷纵横,水道复杂,形成了海底非常崎岖的地形地貌,这种崎岖海底严重影响了其下覆地层的地震成像,并造成了构造形态的严重崎变,时间构造图无法反映构造的真实形态.本文提出了两种消除崎岖海底影响的方法.叠前深度偏移技术是解决复杂地质问题,实现复杂构造准确偏移成像的有效途径;移动平均时深转换方法直接对时间构造图进行转换,方法简单实用.实际应用表明,两种方法相互验证,是目前最佳方案,可以达到目前勘探精度的要求.更多还原

【Abstract】 Petroleum exploration in the deepwater area is the hot-spot worldwide at present.The deepwater area in the South China Sea developed excellent petroleum geological conditions,which own huge exploration potential.The water depth here deepens sharply in the slope area,developed crossed canyons and complicated channels compose the rough seafloor,which heavily influences the seismic imaging of underlying formation and causes the severe distortion of structural shape,therefore,it is very difficult to reveal the true structural shape based on time structural map.This paper provides two kinds of methods help to avoid the influence of rough seafloor.Firstly,PSDM is an effective way to figure out the accurate migration imaging of complicated structural and the solution of complicated geological question.Then,the method of moving average time-depth conversion can be used directly for the time structural map.Application shows that two methods mentioned above can be validated mutually and meet the demands of petroleum exploration,which are proven to be optimal scheme for geophysics study with rough seafloor at present.更多还原