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归一化总梯度法自提出以来,在重力资料用于直接找油方面,国外取得了一定的效果。近几年,该方法在国内越来越多地应用于重力资料的解释实践中。方法原理是运用位场的向下延拓,计算观测平面下半空间各深度点上的总梯度,并在相应深度上作归一化处理,求得归一化总梯度值G~H(x,z)。然后,通过GH值在不同位置的圈闭来研究场源分布特点,从而达到勘查地质构造的目的。
Since the proposal of the normalized total gradient method, some achievements have been made abroad in the application of gravity data to find oil directly. In recent years, this method has been applied more and more in the domestic practice of gravity data interpretation. The principle of the method is to use the downward continuation of the site field to calculate the total gradient at each depth point in the lower half of the observed plane and to normalize it at the corresponding depth to obtain the normalized total gradient G ~ H (x ,z). Then, we study the distribution of field sources through the traps of GH at different positions, so as to achieve the purpose of prospecting geological structure.