Multiple gravity and magnetic potential field edge detection methods and their application to the boundary of fault structures in northern South Yellow Sea
1. School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China 2. Key Laboratory of Geo-detection Ministry of Education,China University of Geosciences(Beijing),Beijing 100083,China 3. School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China 4. Qinghai Nulear Industry Geology Bureau,Xining 810003,China
In order to study the contact relationship of geological bodies and the distribution locations and trends of fault structures on the plane in the northern basin of the South Yellow Sea and its adjacent areas, the authors studied the related means used to solve the related geological structures in the study area. The principles of multiple gravity and magnetic potential field boundary detection methods were systematically analyzed, and the gravity data was processed by various methods in the study area. The fault structure was re-identified and re-extracted to study the system of faults and analyze the characteristics of faults, and the tectonic zoning was conducted in combination with seismic data and related geological recognition in the study area. The results indicate that the joint NVDR-Theta, normalized standard deviations and NVDR-THDR, based on the traditional processing methods, are effective methods for dividing faults. The planar characteristics and depth information of the faults can be more quickly, effectively and accurately reflected by the methods in the study area. NE (NNE)-, NW-, nearly EW- and nearly SN-trending fault structures are developed in the study area, which are hierarchical, regional, and different in activity. The NE (NNE)-trending faults form the main structural framework of the area are the main tectonic bodies of the study area. Under the action of long-term severe activity, NE (NNE)-trending faults are distributed throughout the fault area, and are mainly spread in the northern basin and the northwestern area outside the basin, while nearly EW-trending faults are mainly distributed in the central uplift area. The structure and stratigraphic distribution of the foreland basin were formed in the northern basin under the special tectonic stress environment. Six tectonic zones were recognized in combination with the gravity anomalies and seismic data in the study area, which include Luxi uplift, Jiaolai basin, Jiaonan uplift, Qianliyan uplift, the northern basin of the South Yellow Sea, and the central uplift of the South Yellow Sea.
许文强, 袁炳强, 刘必良, 姚长利. 多种重磁位场边缘识别方法及在南黄海北部断裂构造识别中的应用研究[J]. 物探与化探, 2020, 44(4): 962-974.
Wen-Qiang XU, Bing-Qiang YUAN, Bi-Liang LIU, Chang-Li YAO. Multiple gravity and magnetic potential field edge detection methods and their application to the boundary of fault structures in northern South Yellow Sea. Geophysical and Geochemical Exploration, 2020, 44(4): 962-974.
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