反射地震的自动空间校正方法

本文根据不同类型的地震ｔ０数据，采用以下两种计算机自动空间校正的方法：（１）对离散的数据点，首先在平面上进行ｔ０数据网格化，再求出格点处的真深度值，然后勾画等值线；（２）对沿已知ｔ０等值线上拾取的点，首先求出每个点的ｔ０时间梯度值，再沿负梯度方向寻找特征点Ｇ，Ｇ点处界面的真深度等于空校点到界面的法线深度，最后用直线或样条曲线把同一ｔ０值所对应的特征点连接真情为，就可获取一条等深线。在具体处理过程中

Automatic spatial correction methods in reflection seismology

In this paper, two automatic spatial corrcction methods are introduccd in accordance with different types of scismic to data. (1) For discrcte data, first, form a planar grid of to value , next,calculate the true depth at eaeh grid point, after that, plot thc contours. (2) Given that to contours are known, for each point of particular to contour, first, calculate its time gradient, then find the point G in thc reverse direction of time gradient, whose true depth of the reflector equals the normal depth between the corrected point and thc reflector, and finally connect the G's, which are corresponding to the same to contour, with line scgments or spine curvcs. The Curves such generated are isobathes. In practice, auxiliary points are somctimes needed to determine gradient by means of lincar interpolation. The methods presented here bypass the tedious manaul calculations and have the advantages of flexibility, speedy computation, and high accuracy.