自矿床分离而散落于溪旁基础岩石上，逐步被沙土覆盖，形成冲积性砂。
Separated from the deposit and scattered on the river side of the foundation rock, and gradually be covered with sand, forming alluvial sand.
四川盆地西部侏罗系沙溪庙组是河流—三角洲—滨浅湖沉积为主的红色砂泥岩系，天然气资源相当丰富。
Abundant in natural gas sources, Jurassic Shaximiao Formation in west Sichuan Basin is a red sandstone and shale mainly deposited in fluvial, deltaic shoal faces.
工区东、西两边沙溪庙组具不同的物源沉积，表现在长石含量、碳酸盐岩屑和砂体旋回分布上。
There are different sediment origins for Saximiao formation on both east and west sides of work area, shown in the distribution of feldspar content, carbonate rock cuttings and sandbody cycle.
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