Abstract: There are abundant deep brine resources in XiaoliangshanDafengshan area of Qaidam Basin,but the degree of exploration is relatively low at present.In order to explore the status of brine mineral resources in the region,based on the analysis of regional geological background,the distribution of deep brine aquifers in mining area is interpreted by means of geophysical exploration wells and earthquakes,and the regional hydrogeological conditions are studied,including the occurrence conditions and distribution rules of regional groundwater,groundwater types and the division of aquifer rock groups.A set of microcemented lacustrine facies strata is exposed in the area,which contains high salinity brine,which can be divided into two basic types:fractured pore water of clastic rocks and pore water of loose rocks.The deep brine orebodies and hydrochemical characteristics are analyzed,and the deep brine is divided into five ore layers from top to bottom,all of which belong to magnesium sulfate subtype brine.Finally,the sedimentary evolution law of deep brine potassium resources is analyzed from the topographic,tectonic and climatic conditions in order to provide basic information for the deep evaluation,development and utilization of deep brine resources in Qaidam Basin.

Key words: Qaidam Basin, Deep brine, Hydrochemical characteristics, Halite, Origin analysis