其坝址区区域地质构造复杂，分布侏罗系中统河湖相沉积的厚层砂岩。
The regional geologic structure is complex. The rock mass is mainly composed of Jurassic sandrock and conglomerate.
通过对延长统长8段厚层砂岩沉积岩石学和层序地层学研究，将其分为两类，一类是由多期单一成因的分流河道砂岩叠加构成；
The thick sandstones in Chang 8 oil Formation of Yanchang group may be divided into two types by the research on sedimentary petrology and sequence stratigraphy.
这些褶皱岩层是由奥陶系的中层至厚层石灰岩以及志留系的薄层页岩和粉砂岩组成。
These folded rocks are composed of medium to thick bedded limestone of Ordovician and of thin bedded shale and siltstone of Silurian.
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