Institute of Hydrology and Water Resource Engineering Zhejiang University Hangzhou Zhejiang 310028;
Research Centre of Oceanology Zhefiang University Hangzhou Zhejiang 310028;
Research Institute of Exploration and Development Northwest Branch Sinopec Urumqi Xinjiang 830011;
Tahe Oilfield; fracture-cavity unit; cave system; hydrochemical characteristics of groundwater; exploitation performance;