库车坳陷盐下构造畸变特征分析和校正
Xinjiang Petroleum Geology（2009）
Geophysical Research Center
Abstract
库车坳陷盐下构造形态在时间剖面上常发生畸变,这是造成该区钻探失利的重要因素。根据地震波传播的动力学特征,可将盐下构造畸变分为两类,即绕射性和反射性畸变。在此基础上,通过模型正演,分析了影响盐下畸变程度的2个重要因素(盐上构造形态和层速度结构),引入盐下构造水平参考线(Lsh)和平均速度变化趋势线(va)v的概念。分析vav、Lsh的形态和变化趋势,即可判定盐下构造在时间剖面的真伪和畸变程度。采用叠前深度偏移和时深转换方法,可有效校正盐下构造畸变现象,预测高点偏移方向和偏离距离,为油气勘探提供可靠的圈闭和井位。
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Key words
Kuqa depression,correction,subsalt structure,Tarim basin,time section,time-depth conversion,prestack migration
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