沉积与特提斯地质2025，Vol.45Issue(3)：472-481,10.DOI:10.19826/j.cnki.1009-3850.2025.08009
四川盆地灯影组早期海相白云岩化过程及其空间差异性探讨
Early marine diagenetic dolomitization and spatial heterogeneity of the Dengying Formation,Sichuan Basin
摘要
Abstract
In the Sichuan Basin,the Sinian Dengying Formation contains multiple types of dolomite,with micritic dolomite being the dominant type.The origin of micritic dolomite is conducive to the understanding of the dolomitization process and related reservoir evolution of the Dengying Formation.This study investigates the spatial heterogeneity of micritic dolomite,indicating that it is a product of early(syn-depositional and penecontemporaneous)marine diagenesis.In different sedimentary environments,micritic dolomite shows various features:In an environment of restricted platform,micritic dolomite shows lower crystallinity and δ13Ccarb values,while in an environment of platform margin,dolomite shows higher crystallinity and δ13Ccarb values,reflecting various dolomitization processes in different settings.In the restricted platform,dolomitization is mainly related to evaporation and early marine diagenetic organic decomposition;in the platform margin and adjacent areas,it may result from microbial sulfate reduction under low-sulfate anoxic conditions.This spatial heterogeneity exerts influence on crystal and related reservoir features.关键词
四川盆地/灯影组/同沉积期—准同生期海相白云岩/空间差异性Key words
Sichuan Basin/Dengying Formation/syn-depositional to penecontemporaneous marine dolomitization/spatial heterogeneity分类
天文与地球科学引用本文复制引用
周刚,钟原,张自力,武鲁亚,乔艳萍,豆霜,戴鑫,葛毓柱..四川盆地灯影组早期海相白云岩化过程及其空间差异性探讨[J].沉积与特提斯地质,2025,45(3):472-481,10.基金项目
国家自然科学基金重点项目(U2344209) （U2344209）
