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Geothermal geological conditions of the Western Dinosaur Park block in the Lanzhou New area |
SUN Hai-Chuan( ) |
Gansu Coal Geological Prospecting Institute, Lanzhou 730000, China |
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Abstract The Western Dinosaur Park of the Lanzhou New area, located in the Lanzhou-Minhe Basin, has encouraging prospects for geothermal exploration, development, and utilization. Based on the previous results of regional geological structure and geothermal characteristics, this study further investigated the geothermal reservoir horizons and the geothermal geological conditions using both the controlled source audio-frequency magnetotellurics (CSAMT) and the magnetotelluric sounding. Then, available geothermal water with suitable temperatures was discovered by drilling. Based on the geophysical exploration and drilling results, this study deduced and explained the structure and pluton distribution of the study area, analyzed the geothermal geological conditions, and pointed out the future exploration direction. The results of this study can be utilized as a reference for geothermal exploration in adjacent areas of the Western Dinosaur Park and similar areas.
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Received: 19 November 2021
Published: 03 January 2023
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General situation of geological structure and layout of geophysical prospecting engineering in the study area
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Distribution map of geotemperature gradient in Gansu, Qinghai and Ningxia area
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地层 | 主要岩性 | 电阻率/(Ω·m ) | 第四系 | 砂土、砂砾碎石 | 59~98 | 新近系 | 泥岩、细砂岩、砾岩 | 12~16 | 古近系 | 泥岩、砂岩夹石膏 | 3~20 | | 泥岩、砾岩 | 38~94 | 白垩系 | 粉砂岩、泥岩 | 5~35 | | 砾岩、砂砾岩 | 45~65 | 侏罗系 | 砾岩、砂砾岩、砂岩、泥岩 | 30~60 | 新元古界皋兰群 | 片岩、硅质灰岩 | >100 |
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Characteristics of formation resistivity in Minhe-Lanzhou basin
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CSAMT inversion resistivity section of line 4(a) and line A6(b)
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Geophysical prospecting comprehensive section of line 5
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Comprehensive log result map of well T01
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Geothermal model diagram
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