西安石油大学学报（自然科学版）2025，Vol.40Issue(5)：22-33,56,13.DOI:10.3969/j.issn.1673-064X.2025.05.003
致密砂岩油差异富集主控因素
Main Controlling Factors for Differential Enrichment of Tight Sandstone Oil:Taking Chang 61-4 Member in Zhidan Area of Ordos Basin as an Example
柳朝阳 1姚东升 2辛毅超 1荣亦鸿 3顾开放 2李莲庆 2王丽 2李世宏 2徐文秀2
作者信息
- 1. 延长油田股份有限公司 勘探开发技术研究中心,陕西 延安 716000
- 2. 中国石油新疆油田分公司 勘探开发研究院,新疆 克拉玛依 834000
- 3. 中国石油新疆油田分公司 工程技术研究院,新疆 克拉玛依 834000
- 折叠
摘要
Abstract
Chang 6 member is the main oil producing layer in Zhidan area of the Ordos Basin,but the distribution of oil reservoirs is complex,and the understanding of reservoir formation laws and mechanisms is unclear,which has become a key factor restricting oil ex-ploration.Based on core observation,high-pressure mercury injection,and whole rock X-ray diffraction analysis and testing experiments,combined with logging while drilling and logging data,the main controlling factors for reservoir formation in the Chang 6 member are an-alyzed.The results show that sand-body size,diagenesis,and source-reservoir structure are important factors controlling the differential reservoir formation in the Chang 6 member.There are positive correlation between thickness and physical properties,oil saturation of sand bodies,with the thicker sand bodies often having better physical properties and higher oil saturation.The compaction is the most destructive diagenesis in the Chang 6 member.In the sedimentary background of＂lake advancing and sand retreating＂,the difference in plastic and rigid debris content in different sub-members controlled the damage degree of primary pores in particles,resulting in a grad-ual decrease in the reduction rate of porosity and an increase in the preservation of primary pores in the Chang 61-4 section from bottom to top.In addition,based on the sand-to-land ratio of 40%and60%,the Zhidan area can be divided into three types of source-reservoir structures:reservoir sandwiching source rock,source rock-reservoir interlayering each other,and source rock sandwiching reservoir.A-mong them,the structure of reservoir sandwiching source rock has a higher proportion of large pore throat due to lower displacement pressure and median pressure,which is most conducive to the enrichment of tight sandstone oil,followed by the structure of source rock-reservoir interlayering each other.The structure of source rock sandwiching reservoir is the least conducive to the enrichment of tight sandstone oil.关键词
成藏因素/差异富集规律/成因机制/鄂尔多斯盆地/延长组/长6段Key words
hydrocarbon accumulation influencing factor/differential enrichment law/genetic mechanism/Ordos Basin/Yanchang for-mation/Chang 6 member分类
天文与地球科学引用本文复制引用
柳朝阳,姚东升,辛毅超,荣亦鸿,顾开放,李莲庆,王丽,李世宏,徐文秀..致密砂岩油差异富集主控因素[J].西安石油大学学报（自然科学版）,2025,40(5):22-33,56,13.
