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对碳酸盐岩储层开展叠前时间偏移和叠前深度偏移正演模拟对比工作,利用均方根速度等效目的层以上地层速度进行正演模拟分析。认为若上覆地层速度有横向变化时,叠前时间偏移“串珠”会有横向漂移,而叠前深度偏移没有“串珠”横向漂移;时间偏移域“串珠”的横向漂移方向都是向横向速度大的区域移动,即远离横向速度小的区域。因此,速度模型准确的情况下,利用三维地震叠前深度偏移资料可以使钻井有效钻至缝洞体。
Prestack time migration and prestack depth migration forward modeling are compared for carbonate reservoirs, and forward modeling is performed using the velocity above the equivalent target velocity of root mean square velocity. If there is a lateral change in the overlying strata velocity, the prestack time migration “beaded ” will have lateral drift, while the prestack depth migration does not have “beaded ” lateral drift; the time shift field "beaded Of the lateral drift direction is to move to a large area of lateral velocity, that is, away from the lateral velocity of the small area. Therefore, when the velocity model is accurate, the drilling data can be effectively drilled to the seam body by using the data of 3D prestack depth migration.