黄骅拗陷歧南次凹沙三段储层特征及主控因素

doi:10.11885/j.issn.1674-5086.2021.10.29.02

摘要/Abstract

摘要： 通过岩芯观察及实验室综合分析，结合测井等手段，对黄骅拗陷歧南次凹沙三段储层岩石学及物性特征进行了研究，分析了储层特征及主控因素。结果表明，岩石类型以长石岩屑砂岩（49.29%）为主，岩屑长石砂岩（33.21%）次之，具有近物源、成分成熟度低的特征。储层孔隙度主要分布在[5%，25%），占样品的83.38%，渗透率主要分布在[0，10） mD，占样品的77.45%，属特低孔-低孔-中孔、超低-特低渗透储层。孔隙度和渗透率在储层内部纵向上变化大，相关性差，储层非均质性强。综合分析认为，储层物性主要受沉积相、成岩及构造作用控制。三角洲前缘亚相水下分流河道、水下天然堤、河口坝砂体，三角洲平原亚相分流河道、决口扇砂体及近岸水下扇为有利储层分布相带；压实和胶结作用导致储层物性变差，但泥晶碳酸盐及绿泥石胶结、分散胶结作用，对剩余粒间孔起到了保护作用，而长石和岩屑的溶蚀及交代作用改善了储层物性；构造作用是储层发育的有效补充因素。

关键词: 储层特征, 主控因素, 沉积相, 成岩作用, 沙三段, 歧南次凹

Abstract: Based on core observation, comprehensive laboratory analysis, combined with logging and other means, this paper studied the petrological and physical characteristics of Shahejie Formation reservoir in the study area, analyzed the characteristics and main controlling factors of reservoir development. The result shows that Feldspar lithic sandstone (49.29%) is the main rock type, followed by lithic feldspar sandstone (33.21%), which are near provenances with low compositional maturity. The porosity of the reservoir is mainly distributed in the range of 5%~25%, accounting for 83.38% of the sample, and the permeability is mainly distributed in the range of 0~10 mD, accounting for 77.45% of the sample, which belongs to the ultra-low porosity–low porosity–medium porosity, ultra–low permeability reservoir. Porosity and permeability are different in the vertical sections of the reservoirs, and the correlation is poor, and the reservoir heterogeneity is strong. Based on the above analyses, the reservoir physical property are mainly controlled by sedimentary facies, diagenesis and tectonics. Subaqueous distributary channel, underwater natural dike, mouth bar sand body in delta front, distributary channel, fissure fan sand body in delta plain and nearshore subaqueous fan are favorable reservoir distribution facies belts. Compaction and cementation lead to the deterioration of reservoir properties, micritic carbonate and chlorite cementation, dispersion cementation has a certain positive effect on the protection of the remaining intergranular pores. Morever, the dissolution and metasomatism of feldspar and debris also improved the performance of the reservoir. The tectonism is the effective supplement for reservoir development.

Key words: reservoir characteristics, controlling factor, sedimentary facies, diagenesis, Sha 3 Member, Qinan Sag

中图分类号:

TE122

徐刚, 陈永东, 陈成, 胡林, 刘子畅. 黄骅拗陷歧南次凹沙三段储层特征及主控因素[J]. 西南石油大学学报(自然科学版), 2023, 45(6): 31-42.

XU Gang, CHEN Yongdong, CHEN Cheng, HU Lin, LIU Zichang. Reservoir Characteristics and Reservoir-controlling Factors of E_s₃ Member in Qi'nan Sag, Huanghua Depression[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(6): 31-42.

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