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由于深海区地层速度的复杂性会导致沉积层的构造畸变,同时在深海区钻井也非常稀少,因此,其本身深度预测的难度就非常之大.在深海区中央峡谷A构造钻探后,利用现有的时深转换方法得到的该构造主力气组西高点地层埋深在已钻井同一连通气组的气水界面之下,但是通过大量的地质与地球物理分析后认为西高点含气可能性非常大,这两者十分矛盾.因此,在全面了解气藏展布特征的基础上,并分析了深海区海水速度的影响因素、上覆地层对目的层速度影响及地震速度体适用性等条件后,本文提出了一种新的时深转换方法—基于原始速度体的多元剥层法.结果表明,用该方法得到的深度域数据与目前地质认识以及地震特殊处理得到的结果吻合度很高,有效的解决了本区上述存在问题,降低了勘探风险,并为下步钻探提供了依据,具有很好的借鉴意义.
Because of the complexity of the stratigraphic velocity in the deep sea area, the tectonic deformation of the sedimentary layer will be caused and drilling in the deep sea area will be very rare at the same time. Therefore, it is very difficult to predict the depth of the deep sea area. Some time-depth conversion method of the main gas group at the construction of the West High Point buried in the same gas wells have been drilled gas and water interface, but after a lot of geology and geophysical analysis that the possibility of gas-rich West High Point Therefore, on the basis of a comprehensive understanding of the distribution characteristics of gas reservoirs, the influencing factors of seawater velocity in deep-sea area, the influence of overlying strata on the velocity of target layer and the applicability of seismic velocity body are analyzed , This paper presents a new method of time-depth conversion-multivariate delamination based on the original velocity body.The results show that the depth data obtained by this method is in good agreement with the current geological knowledge and the special treatment of the earthquake, It effectively solves the above existing problems in this area, reduces the risk of exploration and provides the basis for further drilling, which is of great reference significance.