布格重力异常地形校正方法在微重力勘探中的缺点及其纠正方法

THE SHORTCOMINGS AND CORRECTION METHODS OF BOUGUER GRAVITY ANOMALY TERRAIN CORRECTION IN MICROGRAVITY EXPLORATION

多年来，不论重力勘探程度如何，在布格重力异常计算中都必须经过地形改正和中间层改正。本文通过分析在计算布格重力异常时地改和中间层改正对测点的重力补偿，提出了取消中间层改正以适应微重力勘探精细解释需要的地形校正方法。该方法建立在对实际地形（岩性）的正演基础上，可以根据施工地区的地质条件合理选择重力基准面进行可变密度地形校正。使用该方法可以比较好地消除地形起伏和不均匀岩性对测点产生的重力影响，从而得到比较可信的重力异常数据。

For many years, no matter how the level of gravity explorationmay be, the middle layer and terrain corrections must be done in Bouguer gravity anomaly computation. In this article, the authors propose the terrain correction method to remove the middle layer correction to satisfy the fine microgravity exploration explanation by analysing gravity complementation of terrain and middle layer corrections to surveying points in computing Bouguer gravity anomaly. The method has been established on the basis of direct interpretation to the real terrain and can select reasonably gravity reference surface to make different densities terrain correction, dopending on the geological conditions of working areas. Using this method, people can eliminate effectively the gravity influence of terrain changes and inhomogeneous lithology on surveying points to obtain credible gravity anomaly data.