海陆过渡相页岩气层系沉积研究进展与页岩气新发现

四川盆地海相页岩气成功规模效益开发，使我国页岩气跨入了高速发展的快车道，确立了页岩气在我国能源安全保障中的重要战略地位。我国海陆过渡相页岩气资源丰富，有望成为我国页岩气增储上产的现实领域。目前海陆过渡相页岩气勘探开发和地质评价还处在初期阶段，海陆过渡相富有机质页岩发育特征与分布、沉积模式、有机质富集机理等非常规油气沉积学相关研究有待深入。通过系统厘定海陆过渡相相关概念与特征，明确了国内外典型海陆过渡相页岩气层系；系统总结海陆过渡相页岩沉积研究现状与新进展，揭示了海陆过渡相中富有机质页岩有利发育环境、主要沉积模式和页岩气储层基本特征。系统梳理鄂尔多斯、四川、渤海湾等盆地海陆过渡相页岩气勘探开发新发现，指出了我国海陆过渡相页岩气具有良好勘探开发前景。海陆过渡相页岩层系常伴有煤层，可进行页岩气、煤层气等联合开采，实现“体积开发”，以期有效推动我国天然气产业高质量大发展。

Progress on sedimentology of transitional facies shales and new discoveries of shale gas

The successful scale-beneficial exploitation of marine shale gas in the Sichuan Basin has made China's shale gas step into the fast development lane,and establish the important strategic position in China's energy security.China's marine-continental transitional facies shale gas resources are abundant,which are expected to be the real field in terms of increasing the reserves and enhancing the production of China's shale gas.To date,the exploration and development of transitional shale gas and the study of its geological evaluation are still in the initial stage,and studies regarding unconventional petroleum sedimentology such as the development characteristics and distribution pattern of organic-rich shales,the sedimentary model of transitional shales,and organic matter enrichment mechanism,require further investigation.By defining the relevant concepts and characteristics of transition facies,typical transitional shale gas layers at home and abroad are reviewed,and the research status and new progress of transitional shale sedimentology are summarized,revealing the favorable environment for transitional facies organic-rich shales,sedimentary model,and the fundamental shale gas reservoir characteristics.The breakthroughs and new discoveries of transitional shale gas in several basins including the Ordos Basin,Sichuan Basin,Bohai Bay Basin and so on are systematically discussed,demonstrating the good prospects of the transitional facies shale gas exploration and development.Considering the transitional facies shales are often interlayered with coals,it is indicated that shale gas,coalbed methane could be developed in a collective manner,the“volume development”of transitional facies layers could be applied,so as to effectively promote the high quality development of the natural gas industry in China.