火山岩形成于具有中等成熟度的岛弧环境，其中发育于东水峡的火山岩可能形成于弧内裂谷环境。
They were formed in an island-arc environment of moderate maturity, and the volcanic rocks present in Dongshuixia area might have been formed in an intra-arc rift.
储层岩性主要为中细砂岩，砂岩分选性好-中等，结构成熟度较低。
The lithology of reservoir is chiefly mid-fine grained sandstone with good sorting and low texture maturity.
砂岩成分成熟度高（石英＞90％），结构成熟度中等（杂质为0-10％）。
The compositional maturity of sandstone is highter (Q>90%), but texture maturity is middle (matrix 0 10%).
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