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Geological effect of high-accuracy gravity prospecting in complicated landforms

Yang Hui(Geophysical Research Institute, P. O. Box 11-1, Zhuozhou City, Hebei Province, 072751)Li Ming; Wang Yichang; Wang Xiaomu and Wang Jialin  
Terrain effect of 1: 50000 gravity prospecting result in mountainous region is removed by respectively using slope-top trihedral prism model and rectangular prism model in near, mid and far areas. Conventional methods fail to bring good processing result of gravity anomaly which has undergone terrain correction. 2-D apparent depth filtering method is taken, which includes following steps: upward continuation of observed data by analytic way, downward continuation using difference means, repeated upward and downward continuations in several times, and last downward continuation using difference means to achieve this filtering. The method has been used to process gravity data in a mountainous region. The processed result has been cornpared with corresponding seismic data and borehole data to show satisfactory effect.
【CateGory Index】: P631.2
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