可控源音频大地电磁测量对腾格尔坳陷东北缘下白垩统赛汉组砂体的识别及其地质意义

doi:10.11720/wtyht.2021.1281

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Abstract

There has been no substantial progress in uranium prospecting in Tengger depression. Therefore, CSAMT is used to identify the sedimentary characteristics and structural framework of the study area, especially the lower Cretaceous Saihan formation and its sandbodies. Combined with the geological drilling data, through the forward and inverse calculation of the data in the study area, the inversion model and inversion parameters are optimized, the spatial distribution characteristics of the sand body of the lower Cretaceous Saihan formation in the study area are identified, and the development characteristics of the ancient river channel are briefly analyzed, which provides a reference for the direction of uranium exploration.

Key words： northeast margin of Tengger depression CSAMT forward and reverse calculation Lower Cretaceous Saihan Formation sand body uranium ore exploration

Received: 01 June 2020 Published: 27 July 2021

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Ying-Bin LI. The identification of the sand body of Lower Cretaceous Saihan Formation on the northeastern margin of Tengger depression by controlled source audio frequency magnetotelluric survey[J]. Geophysical and Geochemical Exploration, 2021, 45(3): 616-623.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1281 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I3/616

Geotectonic location map of the study area

Geological logging and logging resistivity curve of hole TZK1-18

Geological resistivity model of design study area

Resistivity and phase under forward calculation of design model

Cross section comparison of resistivity inversion from different initial background models of forward modeling data

Cross section comparison of inversion resistivity under different thickness of the first layer

Cross section comparison of resistivity inversion with different round slip coefficients

Geological and survey line layout of the study area
1—Quaternary system; 2—baogedawula formation of Pliocene; 3—tonguer formation of Miocene; 4—lower Cretaceous; 5—upper Jurassic; 6—measured geological boundary; 7—angular unconformity boundary; 8—structural unit boundary; 9—line and line number

Inversion of resistivity section and inference and interpretation results in the 3~16 km section of L01 line
1—Neogene;2—lower Cretaceous Saihan formation;3—lower Cretaceous basement;4—inferred geological boundary;5—inferred sand body distribution range of Saihan formation;6—inferred fault and number;7—inferred water rich structure;8—inferred aquifer distribution range

Burial depth and thickness of sand body top interface of lower Cretaceous Saihan formation in the study area

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