The application of magnetic and gravity data on research the basement in the southwest of Ordos Basin
Yuan-Li NING1,2, Zi-Yang ZHOU1,2, Dong-Hua SUN1,2
1. Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China 2. Key Laboratory of Uranium Resources Geophysical Exploration Technology,China Nuclear Industry Group Company,Shijiazhuang 050002,China
Based on the aeromagnetic data of the latest high precision of 1∶50 000 and the existing gravity data of 1∶200 000 in 2016 in the southwestern margin of Ordos Basin, data processing was carried out. 1crust fault, 11 basement faults,3 cap rock faults and range of the southern central uplift. Using joint inversion of gravity and magnetic data the depth and thickness of basement and cap rock is roughly understood. The analysis indicates that the gravity field mainly reflects the difference in density between the Ordovician and its overlying sedimentary cover, and the magnetic field mainly reflects the structure of the crystalline substrate. Combined with joint inversion of gravity and magnetic data, the top surface depth of the Ordovician system and the crystallographic basement depth were extracted respectively using gravity data and aeromagnetic data by Euler deconvolution and source parameter imaging, and the basement lithofacies were studied. All that provided an important basis for the prediction of oil and gas in the area. The study believes that the use of high-precision aeromagnetic data combined with gravity data can identify base features effectively and make up for the lack of other geophysical data.
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Yuan-Li NING, Zi-Yang ZHOU, Dong-Hua SUN. The application of magnetic and gravity data on research the basement in the southwest of Ordos Basin. Geophysical and Geochemical Exploration, 2020, 44(1): 34-41.
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