四川盆地海相碳酸盐岩中硅质含有物成因及存在问题分析
Analysis of Origin and Existing Problems of Siliceous Minerals in Marine Carbonate Rocks in Sichuan Basin

四川盆地碳酸盐岩储层为我国主要海相储层之一。通过分析四川盆地碳酸盐岩中硅质岩的沉积背景和赋存层位以及产出形式，发现硅质岩以互层、混积、充填、交代的形式广泛存在于碳酸盐岩中，产出形式、沉积背景各异，对于硅质岩成因的研究有助于判别沉积古环境和成岩环境。硅质岩的成因类型有生物或生物化学成因、化学沉积、交代(硅化)成因等，对于硅质岩成因的研究通常采用岩石学和地球化学等研究方法，其中硅氧同位素的研究对于深化硅质岩成因认识有重要意义。
Carbonate reservoir in Sichuan Basin is one of the main Marine reservoirs in China. Through the analysis of sedimentary background and the occurrence of strata and output form of carbonate siliceous rocks in Sichuan basin, this paper found that the siliceous rocks widespread in carbonate rocks in forms of each layer, blended product, filling, metasomatism, etc. The occurrence forms and sedimentary background of siliceous rocks are different. The study of the origin of siliceous rocks is helpful to distinguish the sedimentary palaeoenvironment from the diagenetic environment. The genetic types of siliceous rocks include biological or biochemical genesis, chemical deposition, metasomatism (silicification) genesis, etc. Petrology and geochemistry methods are usually used to study the genesis of siliceous rocks, among which the study of silicon and oxygen isotopes is of great significance to deepen the understanding of the genesis of siliceous rocks.