科研之友
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摘要
Modern geophysical techniques provide great amount of geophysical field data that contain rich information about crustal structures, which can be extracted for geo-mapping based on the theory of mathematical physics. This paper shows that the high-order spectral moments of regional gravity data include information of geometrical contour surface, which can be used for selection, positioning and classification of some types of geological structures. By using second- order spectral moments of Bouguer gravity data, one can calculate their statistical unvaried quantities and the ridge-like parameter, which characterizes the crustal deformation belts and can be used for mapping regional distribution of the deformation belts. The boundaries between areas of strong or weak ridge-like parameters represent boundaries of different structural units. We can further compute the second-order spectral moments of the ridge-like parameter surface to calculate the boundary parameter, which may be used for tracing and positioning the structural boundaries after some enhancement is added. This paper gives all the formulae for computing the ridge-like and the boundary parameters, and the testing results of crustal structural analysis in Tarim Basin, Northwest China. As a result, the deep High- and Low-density belts within the Tarim Basin are located precisely, providing important basic images for oil/gas exploration in the basin.
- 出版日期2017-8
- 单位中国国土资源航空物探遥感中心; 浙江大学; 中国地质科学院
