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为了解决交叉反射在水平叠加中的最佳成像问题,近几年发展了一种叠前部分偏移新技术,即 DMO(dip moveout)。它的基本思路是,当反射界面倾斜时,动校正分为两步来实现:(1)先进行与倾角无关的动校正,把 t 校正到 t_n,称之为 NMO;(2)再将 t_n 校正到 t_0,实现与倾角有关的动校正,称之为 DMO。文中讨论了实现 DMO 的两种方法,即全式(Hale)法和快式法,并且用修改了的处理流程 ANMO→DMO→RNMO 对岔河集地区垂直牛驼镇大断层的 BX77—13等测线进行了重新处理。剖面质量得到了明显改善。解释结果使大断层的下降盘位置向西移动,发现了大断层下降盘的第三系二台阶。从而使霸县凹陷第三系各层覆盖面积扩大了9—55km~2,增加了可提供井位的局部构造。
In order to solve the optimal imaging problem of cross-reflection in horizontal superposition, a new technique of pre-stack partial offset, DMO (dip moveout), has been developed in recent years. Its basic idea is that when the reflective interface is tilted, the dynamic correction is divided into two steps: (1) Performing the dynamic correction independent of the inclination, and correcting t to t_n, which is called NMO; (2) Corrected to t_0, to achieve and tilt-related dynamic correction, called DMO. In this paper, two methods to realize DMO, Hale method and fast method, are discussed, and BX77-13, etc., of a large fault in the vertical camel town in the Chaheji area are modified with a modified process ANMO → DMO → RNMO The survey line has been reprocessed. Profile quality has been significantly improved. As a result of the interpretation, the position of the descending disk of the large fault moved westwards and the third series of two steps of the large-scale descent disk was found. As a result, the area of Tertiary strata in Paxian Depression has been expanded by 9-55 km ~ 2, which increases the local structure that can provide wells.