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延拓方法是重磁数据处理中常用的位场变换方法。向上延拓对滤去浅部不均匀体引起的干扰可以起着重要作用。但究竟上延多高才能滤去规模多大、埋藏多深的不均匀体引起的重力异常呢，本文试图来探讨这一问题。
Extension method is commonly used in gravity and magnetic data processing field shift method. Upward extension of the filter to eliminate shallow heterogeneous interference can play an important role. However, how high is it possible to filter out gravity anomalies caused by inhomogeneous bodies of large scale and deep burial? This article attempts to discuss this issue.