A Comparative Research of the 2D Wavelet Decomposition and the Nvdr-thdr Technology on the Application of the Gravity Potential Field in Taiyuan Basin
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摘要: 重力位场是地下多个不同密度的地质体所产生的场的叠加，太原盆地由于覆盖层较厚，基底断裂构造复杂，单一的位场信息提取技术不能达到划分太原盆地构造断裂、确定覆盖层厚度及基岩埋深的目标要求。笔者通过综合应用小波分解细节变换功率谱研究及利用归一化总水平导数垂向导数（NVDR-THDR）技术对太原盆地1：5万布格重力异常信息的提取，认为小波分解细节变换技术对确定太原盆地覆盖层厚度及基岩埋深有较大的帮助，得出太原盆地中心覆盖层埋深大于3 km的结论；认为NVDR-THDR技术对太原盆地重力位场中断裂构造的识别能够取得较好的效果，圈定断裂构造18条。Abstract: Gravity potential field is the superposition of many geological bodies with different densities. Because of the thick overburden and complex basement faults in Taiyuan Basin, single potential field information extraction technology cannot meet the target requirements of dividing structural faults and determining the thickness of overburden and the buried depth of bedrock in Taiyuan Basin. In this paper, the information of 1:50000 Bouguer gravity anomaly in Taiyuan Basin is extracted by using wavelet decomposition details power spectra and the NVDR-THDR technology. It is considered that the wavelet decomposition details power spectra technology is helpful to determine the thickness of overburden and the depth of bedrock in Taiyuan Basin, which is concluded that the thickness of central overburden in Taiyuan Basin is more than 3 km. The NVDR-THDR technology can be used to identify the fracture structure of gravity potential field in Taiyuan Basin and to locate the 18 Fault Structures.
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