四川盆地复兴地区陆相页岩油气勘探评价与认识

四川盆地侏罗系湖相页岩层系多、页岩油气资源十分丰富,有望成为中国页岩油气"提储增产"的重要接替领域.以四川盆地复兴地区侏罗系陆相页岩为研究对象,总结该区优质陆相页岩储层地质特征,提高对陆相页岩油气富集成藏的认识,提出适用于陆相页岩油气勘探开发的3项关键技术.研究结果表明:(1)早—中侏罗世,四川盆地复兴地区主要发育自流...

Exploration evaluation and recognition of continental shale oil and gas in Fuxing area,Sichuan Basin

The Jurassic lacustrine shale in Sichuan Basin has multiple producing layers and abundant shale oil and gas resources,which is expected to become a major replacement field for“increasing reserve and production”in China.By taking the Jurassic continental shale in Fuxing area as the study object,the geological characteristics of high-quality continental shale reservoirs are summarized,the understanding of continental shale oil and gas accumulation is updated,and three key exploration and development technologies applicable for continental shale oil and gas are proposed.The results show that:(1)During the Early-Middle Jurassic,three sets of high-quality semi-deep lacustrine shale reservoirs were developed in Fuxing area in Sichuan Basin,including the Dongyuemiao member and Da’anzhai member of Ziliujing Formation,and the second member of Lianggaoshan Formation,with the overall characteristics of medium TOC,medium porosity and high clay content;(2)The development and distribution of continental shale reservoir are controlled by sedimentary facies zone,and hydrocarbon enrichment and accumulation is determined by sedimentary environment and preservation conditions.The natural fracture development affects the high yield zone while the thermal evolution degree determines the types of shale oil and gas reservoir;(3)Three key technologies,such as high resolution“sweet spot”prediction technology,high-efficiency geosteering drilling technology of horizontal well and volume fracturing technology for low-brittleness shale reservoir,are applicable to continental shale gas exploration and development.To sum up,the Jurassic continental shale in Fuxing area has promising resource potential,and it has good exploration and development prospects by applying the existing technologies.