页岩气富集与高产主控因素——以川南地区五峰组—龙马溪组为例  

Main control factors of enrichment and high production of shale gas:a case study of Wufeng-Longmaxi Formation in Southern Sichuan

作　　者：魏力民[1] 王岩[1] 张天操 周桦 温真桃[1] 董翱 WEI Limin;WANG Yan;ZHANG Tiancao;ZHOU Hua;WEN Zhentao;DONG Ao(Exploration&Production Research Institute,Southwest Petroleum Company,SINOPEC,Chengdu 610041,China;No.2 Gas Production Plant,Qinghai Oilfield Company,PetroChina,Dunhuang 736200,China)

机构地区：[1]中国石化西南油气分公司勘探开发研究院,四川成都610041 [2]中国石油青海油田公司采气二厂,甘肃敦煌736200

出　　处：《断块油气田》2020年第6期700-704,共5页Fault-Block Oil & Gas Field

基　　金：中国石化科技部重点科技项目“深层页岩气综合评价及开发技术政策”(P18058-1)。

摘　　要：川南海相页岩气资源潜力巨大,但现有钻探效果差异明显,制约和影响页岩气富集与高产的主控因素不明。通过开展沉积微相、储层特征、埋藏史、生烃演化史及保存条件等方面的研究,归纳出影响川南页岩气富集与高产的主控因素,分别为优质沉积相带、适中的演化程度及良好的保存条件。川南地区优质沉积相带为生物硅质深水陆棚微相和含钙硅质深水陆棚微相,发育的富碳高硅页岩为地质、工程条件下的双甜点,是海相页岩气富集与高产的基础条件;适中的演化程度(包括生烃演化、孔隙演化及构造演化)控制了优质页岩储层的形成,是页岩气富集与高产的重要保障;良好的保存条件使页岩气不易散失,是页岩气富集与高产的决定因素。The potential of shale gas resources in southern Sichuan is huge,but the existing drilling results are obviously different,and the main controlling factors that restrict and affect shale gas enrichment and high production are unknown.Through the analysis of sedimentary microfacies,reservoir characteristics,burial history,hydrocarbon history and storage conditions,it is concluded that there are three main controlling factors affecting the enrichment and high yield of shale gas in south Sichuan,which are namely high-quality sedimentary facies belt,moderate evolution degree and good preservation conditions.Microfacies of biological siliceous deep-water shelf and calcium-containing siliceous deep-water shelf microfacies are favorable lithofacies for shale gas exploration in southern Sichuan.The carbon-rich and high-silicon shale developed in the microfacies which is the basic condition for the enrichment and high production of marine shale gas is a sweet spot of geological and engineering conditions.The moderate degree of evolution,which includes hydrocarbon generation evolution,pore evolution and structural evolution,controls the formation of high-quality shale reservoir,so it is the decisive factor for shale gas enrichment and high yield.Good preservation conditions make shale gas not easy to be dispersed,so it is an important guarantee for shale gas enrichment and high yield.

关 键 词：页岩气 富集高产 优质相带 川南海相 

分 类 号：TE132.2[石油与天然气工程—油气勘探]