新疆和田凹陷西域组砾岩的重力影响及消除方法

为了消除西域组砾岩（简称Q1x）重力影响给重力资源解释带来的干扰，根据和田地区的地质背景，论述了西域组砾岩的分布范围、厚度、岩性、密度值大小与其所含物质成分的关系，分析了和田地区发育地层的电性分层，计算了Q1x产生重力高的幅度。结果表明：通过地面地质调查，综合电测剖面浅层高阻层及重力异常特征可以确定Q1x的地质模型，提出了用正演方法消除Q1x的重力影响，并利用该方法对和田地区重力资料进行了处理，取得了较好的效果。

The gravity effect of Xiyu group conglomerate at Hetian depression of Xinjing and the elimination method

In order to eliminate gravity effect of Q 1 x conglomerate which brings about interference for distinguishing tectonic anomaly,the distribution, thickness and lithology of Q 1 x conglomerate and the relationship between density value and its material composition are discussed according to the geological background of the area in the paper. The electrical property of deformation existing in Hetian area has been analysed and the amplitude of gravity high produced by Q 1 x conglomerate has been estimated. The results show that the geological modal of Q 1 x conglomerate can be chosen by making surface geological investigation and synthesizing high resistance layer in electric survey profile and the feature of gravity anomaly. A method using direct modal for eliminating gravity effect caused by Q 1 x conglomerate is presented. The method has been tested for processing gravity data of Hetian area, producing quite good result.