Characteristics,genesis,and development significance of calcareous baffle interlayers in the Hanjiang Formation,Enping Sag,Pearl River Mouth Basin

doi:10.3969/j.issn.1006-6535.2026.04.006

Abstract

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 interlayers 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 baffle interlayers are more developed along the provenance direction.These results improve the accuracy of geological reserves estimation,guide the design and optimization of development well types,and provide an important basis for reservoir heterogeneity characterization and fine residual-oil tapping under offshore sparse-well conditions.

Key words: calcareous baffle interlayer, development characteristics, genetic mechanism, distribution pattern, Hanjiang Formation, Enping Sag

CLC Number:

TE122

Li Qi, Wen Xin, Yang Jiao, Song Jianhu, Tu Yi, Gong Zheng, Yang Zhipeng. Characteristics,genesis,and development significance of calcareous baffle interlayers in the Hanjiang Formation,Enping Sag,Pearl River Mouth Basin[J]. Special Oil & Gas Reservoirs, 2026, 33(4): 38-48.

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