地质力学学报2024，Vol.30Issue(4)：579-594,16.DOI:10.12090/j.issn.1006-6616.2024062
四川盆地蓬莱地区埃迪卡拉系灯影组二段微生物岩储层成岩作用:对优质储层形成与演化的启示
Diagenesis of microbial dolomite reservoirs in the second Member of Dengying Formation of Ediacaran in the Penglai area,Sichuan Basin:Insights into the formation and evolution of high-quality reservoirs
摘要
Abstract
[Objective]The microbial dolomite of the second Member of the Dengying Formation(Deng 2 Member)in the Penglai area of the Sichuan Basin is widely distributed and considered a potential target for deep carbonate oil and gas exploration.Unlike conventional high-quality reservoirs characterized by porosity and karst fractures,the carbonate rocks of the Deng 2 Member mainly consist of microbial dolomite.The genesis and diagenetic evolution of these high-quality reservoirs remain unclear.[Methods]This study employed petrographic thin sections,scanning electron microscopy(SEM),cathodoluminescence,and computed tomography(CT)scanning to conduct a detailed analysis of the microbial dolomite reservoirs in the Dengying Formation,using field outcrop and core samples.The aim was to gain a deeper understanding of the effects of diagenesis on pore formation and the development of high-quality reservoirs.[Results and Conclusion]The microbial carbonate reservoirs in the study area were characterized by low porosity and very low permeability,predominantly consisting of fracture-porosity(cavity)type microbial dolomite.The reservoir space was primarily composed of intergranular dissolution pores,residual framework dissolution pores,intragranular dissolution pores,and small to medium-sized dissolution cavities,with minor occurrences of intercrystalline pores and intercrystalline dissolution pores.The Deng 2 Member has undergone multiple diagenetic processes;penecontemporaneous dissolution and early epigenetic dissolution were key factors in enhancing porosity.[Significance]These findings enhance the understanding of the genesis of high-quality microbial carbonate reservoirs in the Ediacaran System of the Sichuan Basin and provide valuable information for deep oil and gas exploration and development in the region.关键词
储层成因/微生物白云岩/灯影组/蓬莱地区/四川盆地Key words
reservoir genesis/microbial dolomite/Dengying Formation/Penglai area/Sichuan Basin分类
天文与地球科学引用本文复制引用
王雅萍,鲍志东,张连进,杨东凡,文雯,钟原,唐攀..四川盆地蓬莱地区埃迪卡拉系灯影组二段微生物岩储层成岩作用:对优质储层形成与演化的启示[J].地质力学学报,2024,30(4):579-594,16.基金项目
国家重点研发计划专项(2018YFC0604304) （2018YFC0604304）
中国石油化工股份有限公司科技部专项课题(P23180) This research is co-funded by the National Key Research and Development Program of China(Grant No.2018YFC0604304)and the Special Project of the Department of Science and Technology,Sinopec(Grant No.P23180). （P23180）
