基于FFT的重力正反演方法及其在漠河盆地油气远景预测中的应用

Inversion of Gravity Data Based on FFT and Its Application in the Oil and Gas Prospects Forecast in Mohe Basin

基于快速傅里叶方法原理改进了Parker和Oldenburg提出的重力数据二维及三维的正反演方法,通过对一组模型使用改进前及之后的两种方法进行验算,结果表明该方法在三维重力异常正演计算及三维深度反演计算中均取得了较好的效果。将该方法应用于漠河盆地的基底深度反演中,并综合前人论文资料及先验信息,将漠河盆地划分为四个构造单元。并通过详细分析,预测了漠河盆地的油气远景区。

The forward and inversion method of 2D and 3D gravity data advanced by Oldenburg and Parker was improved based on FFT.The original method and the improved one were applied in a artificial 3D model,and the result indicate that the validity of this method is obvious in the forward calculation of 3D gravity data and the 3D inversion of depth.The method was applied in Mohe Basin to inverse the basement depth,and the prior information is considered,then the Mohe basin is divided into four tectonic units.At last,oil and gas prospective areas of Mohe Basin are forecasted.