it is mainly composed of fine-grained lithic feldspathic, feldspathic and feldspathic clastic sandstone with a low compositional maturity and a middle texture maturity;
储集巖主要为细粒巖屑长石砂巖、长石砂巖和长石巖屑砂巖,以低成分成熟度、中等结构成熟度为特征。
the compositional maturity of sandstone is highter (q>90%), but texture maturity is middle (matrix 0 10%).