Research on the Sedimentary Microfacies Characteristics of the C8 Member in the E Basin

Shaodong Liang; Xinyan He; Hualong He

doi:10.54691/pc5f1x96

Authors

Shaodong Liang
Xinyan He
Hualong He

DOI:

https://doi.org/10.54691/pc5f1x96

Keywords:

Delta Front; Sedimentary Microfacies; Reservoir Characteristics; Subaqueous Distributary Channel.

Abstract

Currently, China's dependence on foreign oil has exceeded 70% and continues to rise, underscoring the urgency to intensify domestic oil and gas exploration and development efforts. The C8 oil layer group in the E Basin represents a critical stratigraphic unit for research. However, to date, no comprehensive and systematic study has been conducted on the sedimentary microfacies of the C8 section, significantly impeding the progress of subsequent oil and gas exploration and development. This study integrates lithologic markers and well-logging facies indicators to conduct an in-depth investigation of the sedimentary microfacies profiles and planar distribution in the study area. The findings indicate that the C8 oil layer group belongs to a deltaic depositional system, specifically classified as a delta front subfacies. Key developed microfacies include subaqueous distributary channels, subaqueous distributary bays, and subaqueous natural levees. Further analysis reveals that the sand bodies within the delta front are relatively well-developed, identifying them as one of the favorable layers for reservoir formation.

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