Abstract: To further reveal the enrichment characteristics and law of shale oil in Lucaogou Formation of Jimusaer sag in Junggar Basin,enrich and develop the theories of continental shale oil accumulation,and better guide the subsequent exploration and development of shale oil,the enrichment laws and controlling factors of shale oil in Lucaogou Formation were comprehensively determined based on the analyses and tests by use of core,rock thin section,well logging,mud logging,formation testing data and X-Ray diffraction whole-rock mineral composition,rock pyrolysis,staged pyrolysis,and nuclear magnetic resonance.In the study area,lacustrine mixed sediments are developed in Lucaogou Formation,and the lithology is dominated by dolomitic/calcareous mudstone,tuffaceous mudstone,silty mudstone,carbonate rock and siltstone.Self-generating and self-preserving retained shale oil is accumulated in mudstone,and the enrichment of shale oil in mudstone is mainly controlled by good hydrocarbon generation potential and suitable thermal maturity;the shale oil of near-source migration and accumulation type is developed in carbonate rock and siltstone,which are characterized with better oiliness and higher free oil content,and the high-quality pore-fracture system and reservoir property control the enrichment and accumulation of shale oil in carbonate rock and siltstone.Vertically,mudstone,carbonate rock and siltstone constitute two-phase mixture (phase-source mixture) type,source-area mixture (origin-source mixture) type and mutation mixture (discontinuous mixture) type sediments.Among them,two-phase mixture type and source-area mixture type sediments have high-quality source-reservoir combination,which is conducive to the development of the lacustrine hybrid sedimentary rock type shale oil characterized with source and reservoir combination and high productivity.In the subsequent exploration and development of continental shale oil,it is required to not only consider the factors such as traditional rock hydrocarbon generation potential and reservoir property,but also comprehensively analyze those such as mixed sediment type,lithologic combination and crude oil fluidity,thus choosing the appropriate way to mine shale oil.

Key words: shale oil, hybrid sedimentary rocks, source-reservoir combination, Lucaogou Formation, Junggar Basin

摘要： 为进一步揭示准噶尔盆地吉木萨尔凹陷芦草沟组页岩油富集特征及规律,丰富与发展陆相页岩油成藏理论,更好指导下一步页岩油勘探与开发,综合岩心、岩石薄片、测井、录井、试油资料及X射线衍射全岩矿物组成、岩石热解及分阶热解、核磁共振等分析测试,深化了芦草沟组页岩油富集规律及控制因素的认识。研究区芦草沟组发育湖相混合沉积,岩性以白云质/灰质泥岩、凝灰质泥岩、粉砂质泥岩、碳酸盐岩、粉砂岩为主。泥岩类内部发育"自生自储"滞留型页岩油聚集,良好的生烃潜力和适宜的热演化成熟度主导了其内部页岩油的富集;碳酸盐岩、粉砂岩内部发育"近源运聚"型页岩油聚集,具有含油性更好、游离油含量更高的特点,优质的孔-缝体系和储集物性控制着其内部页岩油的富集成藏。垂向上,泥岩类与碳酸盐岩、粉砂岩构成两相混合(相源混合)型、源区混合(母源混合)型和突变混合(间断混合)型沉积类型,其中,两相混合型沉积和源区混合型沉积具有优质的源储组合,利于发育具良好产能的"源-储一体"湖相混积岩型页岩油。陆相页岩油勘探开发不仅要考虑传统的岩石生烃潜力、储集物性等要素,还需综合分析混合沉积类型、岩性组合和原油可流动性等要素,选取适宜的页岩油开采方式。

关键词: 页岩油, 混积岩, 源-储组合, 芦草沟组, 准噶尔盆地