摘要
研究柴达木盆地研究区地下水空间分布特征。本文首先通过岩石物性分析,获得了研究区典型岩石电性特征,为后续三维电性模型分析提供了可靠的电性依据。然后采用三维非线性共轭梯度反演算法获得了研究区音频大地电磁三维电性结构模型,并依据经验公式计算了研究区地下水矿化度。最后结合三维电性模型和地下水矿化度综合分析了研究区地下水空间分布特征。成果表明,研究区有利的富水区域为绿梁山以东,大头羊洪积扇以南区域的第四系卵、砾石层,位于现代河床及冲洪积扇中缘区域为淡水区域的主要富集区,受绿梁山阻挡,在山前平原一带以及绿梁山南侧泄出带附近为咸水区域。
This paper studies the spatial distribution characteristics of groundwater in Qaidam Basin by geophysical methods.Firstly,the electrical characteristics of rock in different lithology areas are obtained by using the method of measuring rock physical properties.Then,the relation between the electrical characteristics of the hydrologic borehole and the AMT electromagnetic data is obtained by using 1D inversion method of AMT electromagnetic data.Three-dimensional nonlinear conjugate gradient inversion(ModEM)algorithm is used to invert AMT data in order to obtain a reliable three-dimensional conductivity model within 3000 meters underground in the study area.Finally,combined with 3D electrical model analysis technology,the distribution characteristics of quaternary strata and aquifers in the study area are further analyzed,and the distribution characteristics of groundwater at different depths in the area are discussed by using resistivity parameters and groundwater salinity parameters.The research results show that the favorable water-rich area in the study area is the Quaternary pebble and gravel layers in the east of Luliang Mountain and the south of the Daouyang diluvial fan.The area located in the middle margin of modern river bed and alluvial fan is the main rich area of fresh water.Blocked by Luliang Mountain,there is a saltwater area near the piedmont plain and the drainage zone on the south side of Luliang Mountain.
作者
辛会翠
徐志敏
肖晓
XIN Huicui;XU Zhimin;XIAO Xiao(Chengde Petroleum College,Chengde 067000,China;Instrumentation Engineering Technology,Research Center of Hebei Province,Chengde 067000,China;School of Geosciences and Info-physics of Central South University,Changsha 410083,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第5期588-600,612,共14页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(42074087)
中央引导地方科技发展资金(206Z1705G)项目资助。
关键词
音频大地电磁测深法
水文地质
岩石物性
电性结构
地下水矿化度
audio-frequency magnetotelluric method(AMT)
hydrogeology
rock physical properties
electrical structure
groundwater salinity
