摘要
本研究基于大地电磁测深方法(MT)在青藏高原兴海盆地开展地热资源勘探,通过高精度数据采集与多维反演技术揭示深部电性结构特征。研究采用美国CG公司Aether全频带系统与LEMI-120磁探头,布设十字交叉测网完成106个物理测点,创新采用50–300 m动态极距调整、多电极降阻(接地电阻<2000Ω)及多装置布设技术,有效克服高阻地层信号衰减和外部电磁干扰难题,在兴海盆地内测得深度大、精度高、连续性好的数据。采集的数据由多个单点数据文件组成集合,构成兴海盆地全区探测成果,单点数据包含完整的头信息和数据体,支持阻抗、倾子、误差等信息。对仪器和磁探头进行平行试验控制数据质量,电阻率和相位总均方误差计算结果表明,采集数据质量合格。本数据支持多算法二次开发应用,对青藏高原深部地热勘探具有重要示范价值。
The study investigates geothermal resource exploration in the Xinghai Basin of the Tibetan Plateau using the magnetotelluric(MT)sounding method.High-precision data acquisition combined with multi-dimensional inversion techniques was employed to characterize the deep electrical structure.This study employed the Aether full-band system from U.S.-based CG Company and LEMI-120 magnetic probes to establish a cross-shaped survey network,completing 106 physical survey points.Innovative techniques such as dynamic electrode spacing adjustment(50–300m),multi-electrode resistance reduction(grounding resistance<2000Ω),and multi-configuration deployment were applied to effectively overcome challenges related to signal attenuation in high-resistance formations and external electromagnetic interference.As a result,high-quality MT data with large exploration depth,high precision,and strong continuity were obtained in the Xinghai Basin.The collected data are organized into multiple single-point data files,forming a comprehensive survey result for the entire Xinghai Basin area.Each single-point dataset includes complete header information and a data volume,supporting parameters such as impedance,tipper responses,and errors.Parallel testing of instruments and magnetic probes was conducted to control data quality.The calculated total root mean square errors of resistivity and phase demonstrate that the acquired data meet quality standards.The dataset supports secondary development and application with multiple algorithms,providing significant reference value for deep geothermal exploration in the Tibetan Plateau.
作者
张庆元
王斌
张飞
谭立渭
李磊
晁增成
李聪
ZHANG Qingyuan;WANG Bin;ZHANG Fei;TAN Liwei;LI Lei;CHAO Zengcheng;LI Cong(Institute of Hydrogeological Engineering and Environmental Geological Survey of Qinghai Province,Xining 810008,P.R.China;Key Laboratory of Hydrogeology and Thermo-Geology of Qinghai Province,Xining 810008,P.R.China;State Key Laboratory of Loess Science,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,P.R.China;The Fourth Geological Institute of Qinghai,Xining 810008,P.R.China)
基金
青海昆仑英才计划(2023QHSKXRCTJ30)。
关键词
兴海盆地
地质特征
大地电磁数据
黄河上游
Xinghai Basin
geological characteristics
magnetotelluric data
the upper reaches of the Yellow River
