Upper Triassic clasolite reservoirs in West Sichuan are a set of tight sand-mud rocks with low porosity-low permeability, high aqueous saturation and abnormal high pressure.

• 川西上三叠统碎屑岩储层是一套低孔渗，高含水饱和度，具高异常地层压力的致密砂泥岩层。