沉积学报2025，Vol.43Issue(5)：1555-1568,14.DOI:10.14027/j.issn.1000-0550.2025.052
海相碳酸盐岩全储层效应的提出及勘探意义
Proposal and Exploration Significance of"Integrated Reservoir Potential"in Marine Carbonates:A case study of the Permian in the central Sichuan Basin
摘要
Abstract
[Objective]With the continued advances in the exploration of deep to ultra-deep marine carbonate rocks,the traditional paradigm of targeting"dolostone-preferred"reservoirs is undergoing a new round of transforma-tion.[Methods]Taking the Permian system in the central Sichuan Basin as an example,this study systematically in-vestigated the formation mechanisms and favorable reservoir conditions of various types of ultra-deep marine carbon-ate reservoirs using a range of technical approaches,including core observation,thin-section identification,micro-area C-O isotope analysis and U-Pb isotope dating.[Results]It was found that the Permian Maokou and Changxing Formations in the region had developed many types of high-quality dolomite,limestone and weakly dolomitized lime-stone reservoirs,even at burial depths exceeding 5 900 m.The reservoir thicknesses range from 5 m to 50 m,with porosities between 2.0 and 12.0 percent.Systematic analysis revealed that such reservoirs do not exist in isola-tion but have co-evolved within a unified tectonic/sedimentary/diagenetic dynamic system,forming composite reser-voir clusters.The concept of an'Integrated Reservoir Potential'is proposed for the marine carbonate rocks of the Permian system in the basin,suggesting that,within a unified tectonic/sedimentary/diagenetic framework,the forma-tion,preservation and optimization of pores were jointly influenced by paleo-Permian rifts,the Dongwu paleoweather-ing surface,and the reactivation of multi-stage paleofaults.This promoted the synergistic development of reservoirs of limestone,weakly dolomitized rock and dolomite,and resulted in large-scale reservoir formation across all lithologies of marine carbonate rocks.Under such conditions,dolomite,limestone and weakly dolomitized limestone all form effective reservoirs in ultra-deep marine carbonates.[Conclusions]The'Integrated Reservoir Potential'concept provides guidance for the exploration of Permian marine carbonates in the Sichuan Basin and also offers theoretical support and conceptual insights for deep to ultra-deep carbonate exploration entering the"post-dolostone era"where multiple lithologies are equally emphasized.This advance will drive the progress and discovery breakthroughs in deep carbonate exploration.关键词
四川盆地/二叠系/弱云化储层/全储层效应/勘探新思路Key words
Sichuan Basin/Permian/weakly dolomitized reservoirs/integrated reservoir potential/exploration strategy分类
天文与地球科学引用本文复制引用
文龙,孙豪飞,高兆龙,甯濛,李天军,王夏,李昌伟,侯明才,罗冰,张玺华,黄可可,陈聪,钟瀚霆,陈超,彭瀚霖..海相碳酸盐岩全储层效应的提出及勘探意义[J].沉积学报,2025,43(5):1555-1568,14.基金项目
新型油气勘探开发国家科技重大专项(42272131)National Science and Technology Major Project for New-type Oil and Gas Exploration and Development,No.42272131 （42272131）
