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引言 在北海二叠纪盆地南部的中央部位,镁灰岩群为一套厚层盐岩层序,它由大量薄层状硬石膏、白云岩和石灰岩夹层所组成。据认为,这些不同岩性地层的速度与其埋深和横向稳定性无关。实践结果所得出的结论是,盐岩体的速度是大约4 400ms~(-1),而薄夹层的速度一般接近6 000ms~(-1)。在对镁灰岩群进行地震解释时,通常使用几种方法来确定时-深转换关系。这些方法一般是基于稳定的层速度或双曲线层速度函数。虽然这些方法在横向连续的夹层发育区
Introduction In the central part of the southern Permian Basin in the North Sea, the magmatic limestone is a thick sequence of salt rocks consisting of a large number of thin layers of anhydrite, dolomite and limestone intercalations. It is believed that the velocities of these different lithologic formations have nothing to do with their depth and lateral stability. The result of practice shows that the velocity of salt rock mass is about 4 400 ms -1, while the velocity of thin interlayer is generally close to 6 000 ms -1. In the interpretation of the magmatic limestone masses, several methods are commonly used to determine the time-depth transformation. These methods are generally based on stable layer velocities or hyperbolic layer velocity functions. Although these methods are in laterally continuous dissection zone