出露于四川盆地及周边的中生代侏罗系地层，属于中生代红层，为热带荒漠季节性河流沉积，岩性为正长石砂岩、长石石英砂岩与泥岩互层。 其内常发育有恐龙化石。 所产砂岩可做建筑材料开采
须家河组和下沙溪庙组的砂岩储层是官南构造陆相碎屑岩中的主要产气层。
Sand reservoirs of Xujiahe Formation and lower Shaximiao Formation is the major gas production layers in continental elastics in Guannan Structure.
针对沙溪庙组特定的地质特征，本文采用了最佳子集及GA - BP神经网络模型预测产能。
Based on the specific geological features of Shaximiao formation, this article used the best subset and GA-BP neural network models to predict the deliverability.
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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