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《Geoscience》 2018-05
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Division of Base-level Cycles and Superimposition of Sandbodies in Marine Braided Delta Reservoir: A Case Study of Zhujiang Formation in Xijiang W Oilfield,Pearl River Estuary Basin

LIANG Xu;FAN Ting'en;HU Guangyi;CHEN Fei;WANG Haifeng;FAN Hongjun;CNOOC Research Institute;  
Reservoirs in the Zhujiang Formation of the Xijiang W Oilfield are composed of marine braided river delta front deposits. They are characterized by complex internal architecture and contain different microfacies.In this study,high-resolution sequence stratigraphic framework is established via comprehensive analysis of core,wireline logs,spectrum and high-resolution sequence stratigraphy theory. The results show the presence of five long-term and eighteen medium-term base-level cycles within the Zhujiang Formation. The sandbody architecture comprises four types( i. e.,the isolated-,lateral superposition-,two-way migration-and amalgamated type) within the Zhujiang Formation stratigraphic framework,as revealed by statistical analysis of geometric parameters and sandbody distributions. The results indicate that long-term base-level changes play an important role in controlling the sandbody architecture and evolution. During the early-stage rising or late-stage falling in the base-level cycle,the sandbody architecture is dominated by the amalgamated type and lateral superposition type,yet it is dominated by the two-way migration type and isolated type in the opposite case. Analysis of sandbody architecture provides an effective tool for discovering residual oil and assists decision-making process in offshore hydrocarbon exploration.
【Fund】: 国家科技重大专项“大型油气田及煤层气开发”(2016ZX05025-001)
【CateGory Index】: P618.13
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