油气化探的异常确定一直是争论较多的问题之一 ,尤其是在存有背景差异的情况下就更为突出。分区划分异常下限带有较强的人为因素 ,而趋势分析面对情况比较复杂的地学空间场 ,也会因为拟合度或边界效应等原因而出现较大的误差。作者在本文中采用了傅立叶带通滤波 ,消除了空间场中的背景差异 ,在塔北油气勘探的应用中取得了较好的效果。 Abnormal determination of geochemical exploration has been one of the most controversial issues, especially in the presence of background differences even more prominent. The lower limit of anomalous zonation with strong human factors, and trend analysis of the more complex situation of the geo-spatial field, but also because of fit or boundary effects and other reasons there is a big error. In this paper, the author uses Fourier bandpass filtering to eliminate the background differences in the space field, and achieved good results in the application of oil and gas exploration in the northern Tarim Basin.