塔里木盆地东部重力异常离散小波多分辨分析

Discrete Wavelet Multi-resolution Analysis for Gravity Anomalies in Eastern Tarim Basin

通过对塔里木盆地及天山东部地区布格重力异常的二维离散小波多分辨分析，计算了各阶逼近和细节的波长与场源深度，并对分解结果进行了地质构造解释。结果表明，5阶逼近主要反映了该地区莫霍面的特征，1～5阶细节反映了地壳总体的构造特征。天山山脉和塔里木盆地存在重要的南北向构造：塔里木盆地的北东、东西向构造最早，南北向次之，北西向构造最晚；种马场南缘断裂对天山和塔里木盆地具有重要的分隔意义；塔里木盆地的复合构造十分丰富。研究结果为塔里木东北缘的油气田勘探与开发提供了新的地球物理资料。

Based on a 2-D discrete wavelet multi-resolution analysis for gravity anomalies in Eastem Tarim Basin and Tianshan orogenic belt, this paper presents a calculation of the waveleng the wavelength range and the depth of sources for different level details and approximation of Bouger gravity anomalies. The decomposition results are explained from the perspective of geologic structure. The 5th level approximation exhibits the characters of moho and the lst～ 5th details reflect the structural feature in the region overall. The research results show that Tarim Basin and Tianshan orogenic belt exist important North-West （NS） structure. In Tarim Basin, the earliest are North-East （NE） and West-East （WE） structure, and then is North-South （NS） structure. The last is North-West （NW） structure. The southern Zhongmachang fault is very important for the mmpartition of Tarim Basin and Tianshan orogenic belt. Varied composite structure occurred in Tarim Basin. All researches provide new geophysical information for the oil-gas resource exploration and the development of Northeastem Tarim Basin.