【摘要】 当地层倾角较大时,反射点偏离较大,动校正叠加得到一个零炮检距剖面的假设,与实际情况相差较远,叠后时间偏移很难获得较理想的偏移归位效果。叠前时间偏移方法,从理论上取消了输入数据为零炮检距数据的假设,避免了动校正叠加所产生的畸变,是复杂地区地震数据成像较理想的方法。通过近两年的开发和应用,叠前时间偏移技术已经趋于成熟,在温西南地区,该技术取得了令人满意的效果。更多还原

【Abstract】 When stratigraphic dip is huge, reflection-point offset is obvious. An assumption that zero offset section will be obtained from normal-moveout correction stack differs greatly from actual situation; it is difficult for post-stack time migration to get perfect migration matching effect. Pre-stack time migration method, which theoretically cancels the hypothesis thst input data is zero offset data and avoids distortion resulted from normal-moveout correction stack, is a perfect method for seismic data imaging in complex region. Having been developed and applied for almost two years, pre-stack time migration technique tends to be mature. It has satisfying effect in southwest area of Wen Jisang.更多还原