EDGE DETECTION OF POTENTIAL FIELD DATA USING AN ENHANCED ANALYTIC SIGNAL TILT ANGLE

Abstract

Edge detection plays an important role in the interpretation of potential field data. Many traditional methods are employed to outline the edges. However, some of them cannot equalize the amplitude of the edges of shallow and deep geological bodies simultaneously; some of them although can balance the anomaly amplitude, the identified edges include some additional false edge information, especially when the measured anomalies contain both positive and negative anomalies simultaneously. Some methods used to avoid this disadvantage are subjective to some extent. In order to solve these problems, this paper proposed a new method called enhanced analytic sinal tilt angle to identify the edges of geological bodies. The new method is tested with synthetic gravity anomaly, which shows that the new method can not only identify the edges of shallow and deep geological bodies clearly and precisely, also can avoid bringing some additional false edges. Finally, we apply the new method to real measured gravity data in Sichuan basin, China, obtaining good results.