准噶尔盆地页岩油“甜点区”评价与关键技术应用——以吉木萨尔凹陷二叠系芦草沟组为例

非常规油气资源已成为准噶尔盆地油气勘探的新领域之一。以吉木萨尔凹陷二叠系芦草沟组为着手点，开展页岩油形成与富集的地质条件、“甜点”评价及预测技术方法等研究。通过总结近年来吉木萨尔凹陷芦草沟组页岩油的勘探成果，梳理出页岩油“甜点”形成的关键地质条件：①广泛分布的优质烃源岩；②致密的储层中发育物性较好的“甜点”段；③源岩层系内频繁的源储薄互层构成源内高效的成藏组合。明确芦草沟组页岩油“甜点”受控于烃源岩、岩性、物性、含油性、敏感性、脆性、地应力各向异性等参数，并基于现场实验参数建立了其评价标准。以“甜点”分布的地质需求为导向，形成了一套多参数“甜点”分布预测技术，涵盖地质、测井、物探以及工程等方面。形成的地质认识丰富了我国陆相页岩油地质理论认识，相关技术方法为准噶尔盆地其他地区页岩油领域以及国内陆相盆地页岩油的评价提供借鉴。

Evaluation and application of key technologies of “sweet area” of shale oil in Junggar Basin：Case study of Permian Lucaogou Formation in Jimusar Depression

Unconventional oil and gas resources have become one of the new fields of oil and gas exploration in Junggar Basin.On the basis of the Permian Lucaogou Formation in Jimusar Sag，research was carried out on the geological conditions for shale oil formation and enrichment，“sweet area” evaluation and prediction techniques.By summarizing the exploration achievements of the shale oil from the Lucaogou Formation in the Jimusar Depression in recent years，key geological conditions for the formation of shale oil sweet area are obtained：(1)Widely distributed source rocks with high quality；(2)Sweet sections with good physical properties are developed in dense reservoir；(3)Thin source-reservoir interbeds in source rock series formed the effective reservoir-forming assemblages in source.It is demonstrated that the sweet area of Lucaogou Formation shale oil is controlled by factors of source rock，lithology，physical property，oil-bearing property，sensitivity，brittleness and in-situ stress anisotropy.Guided by the geological demand of “sweet area” distribution，a set of multi-parameter “sweet area” distribution prediction technology is formed，which covers geology，logging，geophysical prospecting and engineering.The geological knowledge of formation enriches the theoretical understanding of continental shale oil geology in China.Relevant technical methods can provide reference for shale oil evaluation in other areas of Junggar Basin and continental basins in China.