Deep structure and geothermal resource effects of the Gonghe basin revealed by 3D magnetotelluric

IF 2.9 2区地球科学 Q3 ENERGY & FUELS

Geothermal Energy Pub Date : 2024-02-15 DOI:10.1186/s40517-024-00281-x

Yi Yang, Jie Zhang, Xingchun Wang, Mingxing Liang, Dewei Li, Meng Liang, Yang Ou, Dingyu Jia, Xianchun Tang, Xufeng Li

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Abstract

In order to better understand the crustal shortening and orogenic uplift in the northeastern margin of the Tibetan Plateau, as well as the geothermal resource effects formed during this process, we used ModEM software to perform 3D MT imaging on broadband magnetotelluric survey points deployed at 710 points in the Gonghe Basin and its surrounding areas. The resistivity model suggests that the Gonghe Basin exhibits a low–high–low overall electrical structure, with high conductivity widely distributed in the middle and lower crust. The resistivity model also reveals a significant discontinuity between high and low resistivity blocks at various depths in the upper and middle crust. These discontinuities are align with the faults observed on the surface related to strong crustal fluctuations, which are connected to high conductors in the middle and upper crust. Using empirical formulas for high-temperature and high-pressure testing of granite, it is estimated that the melting volume of these high conductors ranges from 3 to 43%, demonstrating good "plasticity". These high conductors can act as detachment layers for crustal shortening and deformation during the expansion of the Tibetan Plateau towards the northeast edge and can continuously conduct heat energy upwards, creating a high thermal background in the Gonghe Basin.

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三维磁层探测揭示共和盆地深部结构和地热资源效应

为了更好地了解青藏高原东北缘地壳缩短和造山运动隆升以及在此过程中形成的地热资源效应，我们利用ModEM软件对共和盆地及其周边地区布设的710个宽带磁电测点进行了三维MT成像。电阻率模型表明，共和盆地整体呈现低-高-低的电性结构，高导电率广泛分布于中下地壳。电阻率模型还显示，中上地壳不同深度的高电阻率区块和低电阻率区块之间存在明显的不连续性。这些不连续性与地表观测到的与强烈地壳波动有关的断层相一致，这些断层与中上层地壳的高导体相连。利用花岗岩高温高压测试的经验公式，估计这些高导体的熔化体积在 3% 至 43% 之间，显示出良好的 "可塑性"。在青藏高原向东北边缘扩张的过程中，这些高导体可作为地壳缩短和变形的脱离层，并可持续向上传导热能，在共和盆地形成高热背景。

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来源期刊

Geothermal Energy Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

7.10%

发文量

审稿时长

8 weeks

期刊介绍： Geothermal Energy is a peer-reviewed fully open access journal published under the SpringerOpen brand. It focuses on fundamental and applied research needed to deploy technologies for developing and integrating geothermal energy as one key element in the future energy portfolio. Contributions include geological, geophysical, and geochemical studies; exploration of geothermal fields; reservoir characterization and modeling; development of productivity-enhancing methods; and approaches to achieve robust and economic plant operation. Geothermal Energy serves to examine the interaction of individual system components while taking the whole process into account, from the development of the reservoir to the economic provision of geothermal energy.