【摘要】 南海西部深水区以二维地震资料为主,受水深变化大、海底崎岖以及地层速度异常等因素的影响,深水区时间域构造不能代表正确的地下构造形态,而常规的时深转换方法解决不了该地区构造畸变的问题。在分析南海西部深水区地层速度变化规律及其与水深关系的基础上,结合正演模拟分析,针对性地应用速度趋势法建模,消除了常规速度建模方法导致的构造畸变,改善了断层和中深层的二维叠前地震成像效果。更多还原

【Abstract】 Most seismic data available in deepwater areas of the western South China Sea are 2D data,and their time structures can not represent the true geological structures,due to great changes in water depth,rough seabed and anomalous interval velocity there.Furthermore,this problem of structure distortion can not be solved by any method of conventional time-to-depth conversion.Based on analyzing the relationship between interval velocity and water depth in these areas and in combination with forward modeling,a trend velocity method is applied to build models,by which the structure distortion resulted from conventional velocity modeling has been removed,and the effects of 2D seismic prestack imaging have been improved for the faults and mid-depth intervals.更多还原