Biogenic quartz in the Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Formation (Wufeng– Longmaxi) shale layers in the Sichuan Basin and its periphery is qualitatively analyzed and quantitatively characterized by organic petrologic, mineralogic, and geochemical methods to find out the coupling effect between organic matter and quartz. (1) There are two types of biogenic quartz in the shale layers: Type I quartz is submicron quartz appearing in clusters around the organic matter. Type II quartz is in nano-scale grain size and floats in spherical shape on organic matter, with grains in point-to-point or surface-to-surface contact; this type of quartz is mainly biologic origin and slightly affected by hydrothermal activity in local parts. (2) The reservoirs in the Wufeng–Longmaxi formations is consistent in distribution with biogenic silica content in them, and mainly concentrated at the bottom of the Wufeng–Longmaxi formations, and is thinner in the Changning and Weiyuan regions, while thicker in the Fuling region. (3) The biogenic quartz in the Wufeng–Longmaxi shale worked through the entire evolution process of hydrocarbon generation. The presence of biogenic quartz can enhance the development of organic matter pores and microcracks, and can effectively preserve the organic matter pores and residual intergranular pores, forming “biological silicon intergranular pores, organic pores and micro-fractures”. This would benefit later hydraulic fracturing and result in high production/stable production of well. The coupling effect between biogenic quartz development and organic matter evolution and hydrocarbon generation is a critical factor for high-quality shale reservoir development.

利用有机岩石学、矿物学、地球化学等方法对四川盆地及周边地区上奥陶统五峰组至下志留统龙马溪组（五峰—龙马溪）页岩层中的生物石英进行定性分析和定量表征，找出有机相之间的耦合效应。物质和石英。(1)页岩层中有两种生物石英：Ⅰ型石英是成簇出现在有机质周围的亚微米石英。II型石英为纳米级颗粒，呈球形漂浮在有机物上，颗粒点对点或面对面接触；这类石英主要是生物成因，受局部热液活动影响较小。(2) 五峰组—龙马溪组储层分布与其生物硅含量一致，主要集中在五峰组—龙马溪组底部，长宁、威远地区较薄，涪陵地区较厚地区。(3) 五峰—龙马溪页岩生物石英贯穿了整个生烃演化过程。生物石英的存在可以促进有机质孔和微裂缝的发育，可以有效地保存有机质孔和残余粒间孔，形成“生物硅粒间孔、有机质孔和微裂缝”。这将有利于以后的水力压裂并导致井的高产量/稳定产量。