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RG线作为时深转换基准面的前提是 RG线等效于地表高程的平滑线。在以往以寻找构造圈闭为目的的勘探中 ,这种方法是可行的 ,原因如下 :1区域地表结构简单 ,RG线可近似为地表的平滑线 ,以地表的平滑线替代RG线的高程误差不大 ;2反射时间误差为几毫秒至几十毫秒 ,不会影响发现幅度较大的背斜构造。目前地震勘探以寻找低幅度构造、断层、以及砂体等构造—岩性油气藏为目标 ,要求地震资料从处理到解释都必须满足一定的精度 ,才能保证地震剖面解释成果的可靠性。在这种情况下 ,RG线作为地震剖面解释的基准面是否合适值得探讨。本文详细论述了 RG线与地表平滑线之间的关系 ,其目的是说明 RG线并不等同于地表高程的平滑线 ,以RG线作为地震剖面解释的基准面会影响对地下构造形态的解释精度。文中还说明了如何解决时深转换的基准面问题。
The prerequisite for the RG line as the time-to-depth datum is that the RG line is equivalent to a smooth line of surface elevation. This method is feasible in the past in the search for structural traps for the following reasons: 1 The surface structure of the area is simple, the RG line can be approximated as the smooth line of the earth surface, and the elevation error of the RG line can be replaced by the smooth line of the earth surface Small; 2 reflection time error of a few milliseconds to tens of milliseconds, will not affect the discovery of a large range of anticlines. At present, seismic exploration aims to find tectonic-lithologic reservoirs with low-amplitude structures, faults and sand bodies. It is required that the seismic data must meet certain accuracy from processing to interpretation, so as to ensure the reliability of seismic interpretation results. In this case, it is worth discussing whether the RG line is suitable as a datum for seismic interpretation. This paper discusses in detail the relationship between the RG line and the surface smooth line. The purpose of this paper is to show that the RG line is not equal to the smooth line of the surface elevation. Using the RG line as the reference plane for seismic profile interpretation will affect the interpretation accuracy of underground structural patterns. The article also shows how to solve the time-depth conversion of the reference surface.