特种油气藏2026，Vol.33Issue(4)：38-48,11.DOI:10.3969/j.issn.1006-6535.2026.04.006
珠江口盆地恩平凹陷韩江组钙质隔夹层特征和成因及油田开发意义
Characteristics,genesis,and development significance of calcareous baffle interlayers in the Hanjiang Formation,Enping Sag,Pearl River Mouth Basin
摘要
Abstract
To solve the problem that the development of calcareous baffle interlayers constrains the fine-scale development of marine sandstone oilfields,core,well logging and resistivity boundary-detection inversion data were integrated.Using microscopic identification,facies analysis,mechanism investigation and distribution prediction,this study investigates the development characteristics,genetic mechanisms,distribution patterns and development significance of calcareous baffle inter-layers within the Hanjiang Formation reservoir of the F Oilfield in the Enping Sag,Pearl River Mouth Basin.Results show that calcareous baffle interlayers in the study area are mainly calcareous fine-and silt-sized sandstones,with calcite as the dominant calcareous component.Conventional logs are characterized by low gamma ray,high density,low neutron porosity,and high resistivity;the resistivity boundary-detection response presents a red high-resistivity feature.Combined with isotopic evidence,three genetic mechanisms are identified:dissolution-reprecipitation of bioclasts,evaporation,and sandstone-mudstone coupled diagenesis.The distribution of calcareous baffle interlayers is jointly controlled by"sequence-sedimentation-diagenesis".Vertically,calcareous baffle interlayers are continuously bedded near stable mudstone intervals,whereas those within sandstone reservoirs are discontinuously bedded and occur as massive patches.Laterally,calcareous baf-fle interlayers are more developed along the provenance direction.These results improve the accuracy of geological reserves estimation,guide the design and optimi-zation of development well types,and provide an important basis for reservoir heterogeneity characterization and fine residual-oil tapping under offshore sparse-well conditions.关键词
钙质隔夹层/发育特征/成因机理/分布规律/韩江组/恩平凹陷Key words
calcareous baffle interlayer/development characteristics/genetic mechanism/distribution pattern/Hanjiang Formation/Enping Sag分类
能源科技引用本文复制引用
李琦,文鑫,杨娇,宋建虎,涂乙,公证,杨志鹏..珠江口盆地恩平凹陷韩江组钙质隔夹层特征和成因及油田开发意义[J].特种油气藏,2026,33(4):38-48,11.基金项目
"十五五"国家科技重大专项"南海油田高效开发技术与集成示范"(2025ZD1407400) （2025ZD1407400）
