海相油气地质2025，Vol.30Issue(2)：133-146,14.DOI:10.3969/j.issn.1672-9854.2025.02.004
四川盆地震旦系灯影组微生物岩多尺度结构特征与沉积新模式
Multi-scale structural characteristics and a new depositional model of microbialites of the Sinian Dengying Formation in Sichuan Basin,SW China
摘要
Abstract
The Sinian Dengying Formation reveals a great resource potential in the central part of Sichuan Basin.Describing the microbialite depositional fabrics at multi-scale is beneficial for clarifying their distribution.Based on outcrop,core,and thin section data,this study characterizes the fabrics of microbialites at mesoscopic,microscopic,and macroscopic scales.Two types of microbialites,stromatolites and thrombolites,are identified in the Sinian Dengying Formation in Sichuan Basin.In addition,non-skeletal grains such as intraclasts,oncoids,ooids,and peloids have also been observed in the Dengying Formation.Based on these petrological characteristics,eleven lithofacies and three sedimentary cycles have been identified,which correspond to three depositional environments,including supratidal-intertidal,shallow subtidal,and lagoon environments.In the supratidal-intertidal environment,the multi-stage microbial biostrome build-ups are observed with the frequently occurrence of the fenestral and teepee structures.The shallow subtidal environment exhibits lens-shaped microbial bioherm build-ups and grain-dominated intraclastic packstone/grainstone.The lagoon cycle is dominated by medium to thick-bedded dolo-mudstone in the lower part.A depositional model for the microbialite of Dengying Formation in Sichuan Basin is established,in which high-quality microbial reservoir are predominantly developed in the lower supratidal-intertidal environment and the upper shallow subtidal environment.关键词
微生物岩/沉积结构/岩相组合/沉积模式/灯影组/四川盆地Key words
microbialite/sedimentary structure/lithofacies association/depositional model/Dengying Formation/Sich-uan Basin分类
石油、天然气工程引用本文复制引用
徐哲航,蔡君,王泽宇,李文正,乔占峰,陈政安,兰才俊,杨岱林,孙晓伟,朱心健,王永骁..四川盆地震旦系灯影组微生物岩多尺度结构特征与沉积新模式[J].海相油气地质,2025,30(2):133-146,14.基金项目
本文受中国石油天然气集团有限公司基础性前瞻性重大科技专项"叠合盆地中下组合油气成藏与保持机制研究"(编号:2023ZZ02)资助 （编号:2023ZZ02）
