固定铝log(Q/K)图解在温泉中的应用  

Application of Fixed-Al Modified log(Q/K) Graph in Hot Spring System

作　　者：张展适[1] 孙占学[2] 李满根[2] 王素娟[2] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]东华理工学院地球科学与资源信息管理系,江西抚州344000

出　　处：《地球科学（中国地质大学学报）》2004年第3期352-356,共5页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金项目 ( 4 0 2 42 0 18)

摘　　要：为探讨常规和固定铝log(Q/K)图解法对温泉系统是否有效 ,采用WATCH程序 ,对江西 3个温度较高的温泉 ,即庐山温泉、汤湖温泉和横泾温泉 ,进行了探测性的研究 .采用常规log(Q/K)图解法计算时 ,由于参加计算的 4个水样的铝含量均未检出 ,计算结果显示只有不含铝的矿物玉髓和方解石相交于温度 1 0 0℃附近 ,热储总体上没有达到平衡 .在采用了固定铝log(Q/K)图解法并同时考虑冷水的稀释作用计算后 ,中低温地热系统中常见的蚀变矿物如浊沸石、纤蛇纹石、萤石和玉髓均显示了较好的收敛性 ,收敛的温度大致在 1 0 0～ 1 4 0℃ .并且上述矿物组合可见于某些温泉的深部钻孔中 ,计算结果与实际地质情况相吻合 .结果表明固定铝log(Q/K)A comparative study was conducted to probe the feasibility of conventional and fixed-Al modified log(Q/K) graph on hot spring system. Lushan hot spring, Tanghu hot spring and Hengjing hot spring in Jiangxi Province were selected to reconstruct the reservoir equilibrium by log(Q/K) graph, and all the calculation were carried out by WATCH program. Due to the lack of Al in the water analytical data, only chalcedony and calcite intersected around 100 ℃ in normal log(Q/K) graph. So no equilibrium status or temperature could be reconstructed by this method. Calculated by the method by combining the fixed-Al method with the mixing factor, minerals association of laumontite, chrysotile, fluorite and chalcedony converged around 100-140 ℃ in fixed-Al modified log(Q/K) graph , which means the equilibrium status could be successfully reconstructed. These mineral assembles occurred in the borehole of Tanghu hot spring field. The calculating result corresponds with the real hot spring system, which might infer that the fixed-Al log(Q/K) graph could be used to reconstruct the reservoir equilibrium in hot spring system.

关 键 词：固定铝 WATCH程序 log(Q/K)图解 温泉 

分 类 号：P314.1[天文地球—固体地球物理学]