Electrical Response of Fault and Its Impact in Sandstone Uranium Exploration:A Case Study of Bachu Uplift
According to the theory of sandstone type uranium mineralization,the suitable structural slope is favorable for uranium metallization.The faults formed by gravity and extrusion in the slope zone play an important role in uranium mineralization and ore preservation.In sedimentary basins,the accuracy of fault interpretation by magnetotelluric method is affected not only by the absolute resistivity,but also the resistivity difference between strata.In order to accurately interpret the potential faults,the geoelectric models of normal and overthrust fault under different electrical differences were established,and the 1D and 2D inverse resistivity cross sections of the fault models with different resistivity differences and different properties were simulated.The simulated results showed that the normal and overthrust fault have different characteristics in the geoelectric inversion section,the normal faults are inclined at the slope of the fault plane,while the overthrust faults are concave in fault plane.The effect of 1D inversion is better than that of 2D inversion.The summarized corresponding characteristics of fault provided the basis and guidance for fault interpretation of magnetotelluric profile in the western depression of Bachu uplift.
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