一种识别陆架坡折带“隐形构造”的时深转换方法
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摘要
番禺—流花地区东南部位于珠江口盆地白云凹陷北坡断裂坡折带,地质条件复杂,沉积环境特殊,海水深度变化大,崎岖海底发育,对地层的准确地震成像和构造成图带来困难,利用叠前时间偏移(PSTM)地震资料解释不能得到具有经济效益的构造圈闭。针对这些问题,本文研究了"三步走"时深转换方法(即水深校正、变速成图、浅层地质异常校正),并在A气田进行了实际应用,应用效果表明,该方法对提高浅海地区构造成图的精度是行之有效的。
Situated at the fault slope breaks in the north slope of Baiyu Sag,Pearl River Mouth Basin,the southeastern of Panyu-Liuhua area is characterized with complex geological conditions,special sedi-mentary environment,water depth sharp change,and rough seafloor.These make difficult for seismic accurate imaging and structure mapping.Thus it is hard to find structural traps on PSTM time maps.To solve the problem,this paper proposes a 3-steps time-depth conversion method including water depth correction,varying velocity mapping and shallow geologic anomalous body correction.This approach is applied on real data in a gas field,and the results show the efficacy of the method for structure mapping in shallow sea area.
引文
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