沉积盆地深层地下卤水资源量评价之若干探讨  

Some Problems Related to the Evaluation of Subsurface Brine Resources in Deep-seated Aquifers in Sedimentary Basins

作　　者：周训[1,2] 姜长龙[1] 韩佳君[1] 唐丽伟[1] 曹琴[1] 李婷[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]地下水循环与演化教育部重点实验室(中国地质大学(北京)),北京100083

出　　处：《地球学报》2013年第5期610-616,共7页Acta Geoscientica Sinica

基　　金：国家"973"计划项目(编号:2011CB403005);中国地质调查项目(编号:1212010011803)联合资助

摘　　要：沉积盆地深层地下卤水(包括富钾卤水)处于深埋封闭和无补给状态;卤水具有很高的测压水头,天然条件下处于停滞状态,不同储卤构造之间无水力联系;具有多个平行叠置的储卤层,不同储卤层之间无水力联系;储卤层空隙性和渗透性差,卤水主要富集于背斜、裂隙带和断层裂隙带;卤水水化学和物理特性在短期内比较稳定;卤水储存资源量较大,在开采条件下卤水资源逐渐减少趋于衰竭。本文在分析总结沉积盆地深层地下卤水资源量评价的现状和卤水特征的基础上,讨论和阐明深层地下卤水资源评价中的若干问题,包括深层卤水资源量的类型和评价方法的选取、储卤层计算范围和边界的概化处理、渗透性分区和卤水密度影响的处理、测压水头的换算、钻井预测水头降深的确定等,目的在于提高深层地下卤水资源量评价计算的精度。Subsurface brines （including K-rich brines） in deep-seated aquifers in sedimentary basins lie under the deeply burial and sealing conditions and are lack of recharge. The brines are of extremely high hydraulic heads and are stagnant under natural conditions. Hydraulic connection does not exist between brine-bearing structures. Several parallel brine-bearing formations are superposed upon each other, and no hydraulic connection exists among the formations. The brine-bearing formations are of low porosity and permeability. The brines are mainly concentrated in anticlines, fracture zones and fault zones. The hydrochemical and physical characteristics of the brines are relatively stable during a short period of time. The storage resources of the brines are relatively large and the resources of the brines tend to decease and be exhausted under the condition of exploitation. Current status of the evaluation of subsurface brines in deep-seated aquifers in sedimentary basins and the characteristics of the brines are discussed and summarized in this paper. Some problems related to the evaluation of subsurface brines in deep-seated aquifers are analyzed and described, which include the types of brine resources in deep-seated aquifers and the selection of the corresponding evaluation methods of the brine resources as well as the generalization of the calculation domain, boundary conditions and subdivision of the permeability. The treatment of the effect of the density of the brines, the calculation of the piezometric head and the determination of the predicted drawdown of the hydraulic head for the production wells are also involved. The aim of this paper is to improve the accuracy of the evaluation of subsurface brines in deep-seated aquifers.

关 键 词：卤水 沉积盆地 富集 水头 开采 

分 类 号：P578.3[天文地球—矿物学] P624.6[天文地球—地质学]