Quantitative architectural analysis of meandering fluvial point bar of Gudong oilfield in Zhanhua Sag Bohai Bay basin China
Abstract In order to extract the remaining oil from the reservoir during the late stage of development, there is an increasing demand for precise research on the internal architecture of the reservoir. In this paper, the meandering fluvial point bar architecture of the Guantao Formation in Gudong Oi...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-09544-4 |
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| Summary: | Abstract In order to extract the remaining oil from the reservoir during the late stage of development, there is an increasing demand for precise research on the internal architecture of the reservoir. In this paper, the meandering fluvial point bar architecture of the Guantao Formation in Gudong Oilfield is quantitatively characterized through the integration of core, well logging, seismic data, and modern river geomorphology analysis. The models for the relationship between point bar length and width, as well as width and thickness, have been established. The investigation of modern meandering fluvial geomorphology shows that the point bar mostly undergoes downstream migration during lateral processes. In this context, geomorphologic parameters such as migration azimuth points, upstream deviation angle, and downstream deviation angle are proposed to quantitatively characterize the architecture of point bars. Statistical regression analysis of modern fluvial point bar geomorphologic parameters reveals a strong correlation between the upstream deviation angle and downstream deviation angle, as well as between the upstream deviation angle and the ratio of point bar width to looplength. Once the dimensions of the point bar and looplength are established, the upstream and downstream deviation angles can be determined, along with the migration azimuth points. The interlayer distribution pattern of the point bar can then be ascertained through a method of plane-profile interactive comparison. For small-scale architecture, the development proportion law of lithofacies in point bars is clearly discernible based on core data statistics. Subsequently, volume models for both point bars and different lithofacies are established. |
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| ISSN: | 2045-2322 |