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观音阁水库位于辽宁省本溪市上游，下古生界可溶性碳酸性盐岩类地区．库区位于阴山东西向复杂构造带的东延部分与新华夏第二隆起带的交接部位．地层沿区内主河流太子河两岸广泛出露震旦系及其后诸地层．受印支、燕山等多次构造运动的影响，库区构造复杂，断裂发育，其中北西向扭性断层（Ｆ３、Ｆ８等）斜穿坝基，错断下覆“１０ｍ页岩”层，对坝基防渗帷幕设置影响较大．岩溶发育，主要特征表现为：（１）沿层理及层间错动面发育；（２）沿断裂面发育；（３）成群性与不均一性．
Guanyinge Reservoir is located in the upper reaches of Benxi City, Liaoning Province, the lower Paleozoic soluble carbonated salt rock areas. The reservoir area is located at the junction of the eastward extension of the east-west complex structure belt of Yinshan and the second uplift of Xinhuaxia. Stratum along the main river in the region across the Prince Edward River straits and subsequent strata. Influenced by many tectonic movements such as Indo-China and Yanshan, the reservoir area has complex structures and faults developed. Among them, NW-trending torsional faults (F3, F8, etc.) Anti-seepage curtain set greater impact. Karst development, the main features are as follows: (1) along the bedding and the development of the interlaminar staggered surface; (2) along the fracture surface development; (3) groups and inhomogeneity.