摘要
致密油的主控因素一直是非常规油气地质理论的核心内容。本文以鄂尔多斯盆地X油田长7段储层特征为研究对象，利用录井、钻井、录井、岩心、薄片、压汞、核磁等资料，揭示了X油田长7段砂岩储层特征。可以得出以下结论：X油田长7段砂岩储层岩石类型以细粒长石砂岩为主，储层物性普遍较差，整体以超低孔—超低渗、超低孔—超低渗致密砂岩为主。残余粒间孔、粒间孔、溶孔及微裂缝发育，其中以溶孔最为丰富，主要为长石、浊积岩溶孔。在成岩作用中，压实作用对砂岩的致密化贡献最大，溶蚀作用为油气聚集提供了良好的储集空间。
关键词： 致密油；储层；长7段；鄂尔多斯盆地
Abstract
The main controlling factors of tight oil have always been the core content of unconventional oil and gas geology theory. In this paper, the reservoir characteristics of Chang 7 member of X oilfield in Ordos Basin are taken as the research object, and the characteristics of sandstone reservoir of Chang 7 member of X oilfield are revealed by using logging, drilling, logging, core, thin section, mercury injection, nuclear magnetic and other data. The following conclusions can be drawn: The rock type of Chang 7 sandstone reservoir in X oilfield is mainly fine-grained feldspar sandstone, and the reservoir physical property is generally poor. As a whole, it is mainly composed of ultra-low porosity - ultra-low permeability, ultra-low porosity - ultra-low permeability tight sandstone. Residual intergranular pores, intergranular pores, dissolution pores and micro-fractures are developed, among which the dissolution pores are the most abundant, mainly feldspar and turbidite dissolved pores. In diagenesis, compaction contributes most to the densification of sandstone, and dissolution provides a good reservoir space for oil and gas accumulation.
Key words： Tight oil, Reservoir; Chang 7 member; Ordos basin
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