鄂尔多斯盆地吴起西部地区长9段致密储油砂岩物性特征

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关键词：吴起地区；长9储层；致密砂岩油；物性；沉积作用；成岩作用

中图分类号：P618.13 文献标志码：A 文章编号：1003-5168（2025）14-0113-04

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.14.022

Physical Characteristicsof Chang9Tight Oil Storage Sandstone in WesternWuqi Area，OrdosBasin

CAO Dandan'NIU Yongfeng1WANG Weilong' WU Yufeng² （1.YanchangOilfieldCo.，Ltd.，Yan'an716Ooo，China;2.SchoolofEarth ScienceandResources，Chang'an University，Xi'an710054，China）

Abstract： [Purposes] Physical properties are important factors affecting the occurrence and seepage characteristics of crude oil in reservoir sandstone.To efficiently explore the potential of Chang9 tight sandstone oil，it is essential to clarifythephysical characteristics and its main control factors，so as to provide guidance for the exploration and development of tight sandstone oil in this region.[Methods] This study employed helium porosity measurement， microscopic observation， mercury intrusion porosimetry and logging data to analyze the petrology，physical properties and pore structure characteristics of Chang9 tight oil reservoir sandstone in western Wuqi area.Furthermore，it discusses the influence of diagenesis，sedimentary environment， mineral composition and pore structure on the physical properties of tight oil reservoir sandstone.[Findings]The results show thatthe Chang9 tight oil reservoir sandstone in the western Wuqi area is mainly feldspathic sandstone，followed by lithic feldspathic sandstone，and mostly pore-cemented. The main oil storage space is intergranular pores，and the pore structure is mainly small pores with fine throats， which has the overall characteristics of low porosity and ultra-low permeability.[Conclusions] Sedimentation and diagenesis are the fundamental factors leading to the low porosity and ultra-low permeability of Chang9 tight oil reservoir sandstone in the western Wuqi area. The mineral composition and pore structure are the media through which sedimentation and diagenesis affect the physical properties.

Keywords： Wuqi area; Chang9 reservoir;tight sandstone oil; physical characteristics; sedimentation; diagenesis

0 引言

自国内非常规油气（如致密砂岩油1、页岩油、煤层气3等）实现规模开发之后，非常规油气资源在国内能源资源消耗中的占比不断提高4]。（剩余4183字）