基于地震速度谱的深水区地层压力预测

Formation pressure prediction in the deep-water area based on seismic velocity spectrum

针对目前深水区油气勘探缺乏足够钻井资料的问题,提出利用地震速度谱数据结合等效深度法进行地层压力预测的方法。与传统的利用地层层速度预测地层压力的方法不同,该方法使用地震瞬时层速度进行地层压力预测,不仅可以反映地层压力的横向展布趋势,同时还能刻画在一套地层内部的压力垂向变化。孟加拉扇深水区X区块的应用效果表明,该方法可以达到预期的地层压力预测要求。

In view of the lack of enough drilling data of the exploration in the deep-water area, the method for formation pressure prediction using seismic velocity spectrum data combined with equivalent velocity was proposed in the paper. Different from the traditional methods of formation pressure prediction by formation interval velocity, formation pressure was predicted by seismic instantaneous interval velocity, which could not only reflect the horizontal distribution tendency of formation pressure, but also portray the vertical changes of interior pressure in a suit of formations. The application results of X Block in the deep-water area of Bengal showed the method could meet the prospective demand of predicting formation pressure.