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时间剖面上的假构造(或构造高点偏移)现象一直是困扰解释人员的一个问题。本文通过几个实例说明时间剖面上假构造(或构造高点偏移)现象的普遍性,指出在盐丘、局部火成岩体、逆掩断层下盘、上覆地层倾角较陡或上覆地层厚度剧变等情况下,都会在时间剖面上引起下伏地层出现构造变形或构造假象。针对时间剖面上构造假象的普遍性及其在时域数据处理中的不可避免性,笔者认为叠前深度偏移技术是解决时间剖面上构造假象的最佳途径;在不具备进行叠前深度偏移条件的情况下,也可在建立正确速度场的基础上通过变速时深转换实现成图。
Fake construction (or the construction of high-point offsets) in the time profile has been a problem plaguing interpreters. In this paper, several examples are given to illustrate the universality of the pseudotectonic (or structural high-point offset) phenomena in the time profile. It is pointed out that in the salt domes, local igneous rocks, under-inverted fault plates, steep dip angles of overlying strata or overburden thickness Drastic changes, etc., will cause the underlying strata in the time profile tectonic deformation or structural illusion. In view of the universality of the construction artifacts on the time profile and its inevitability in the time domain data processing, the author thinks that the prestack depth migration technology is the best way to solve the problem of constructing the illusion on the time profile. In the case of shifting conditions, the mapping can also be realized by changing the time-to-depth conversion on the basis of establishing the correct velocity field.