Characterization of Connectivity Models of Deepwater Turbidite Compound Channels in West Africa

doi:10.11885/j.issn.1674-5086.2017.07.27.01

Abstract

Abstract: The aim of this study was to comprehensively analyze the internal connectivity characteristics of the water channel systems of the A oil group in the K Oilfield using reservoir characterization and configuration descriptions. The deepwater turbidite fan sedimentary facies were described based on core and well log data. The lateral distribution of turbidite channel sedimentary facies were identified based on single-well phase and seismic plane attribute characteristics. With well log and seismic data, the spatial geometric relationships of the compound channels were analyzed, and consequently, 4 types and 15 configurations were classified in the A oil group. Finally, the evolution of the configuration deepwater turbidite compound channels were summarized. The resultes show that the deepwater turbidite channels were dominated by two sub-facies, inlcuding main channels and sandy levees. The physical properties and homogeneity of main channels are superior to the levees. Vertically, compound channels can be divided into three types, e.g., isolated, stacked and layered, while laterally, it can be divided into three types, including echelon isolated, echelon stacked, and echelon layered. In addition, the swaying stacking relationship can be summarized as swaying isolated, swaying stacked, and swaying layered. Deepwater compound channels are categorized into 5 sections with their increasing distance to the source, where hydrodynamic strength decreases after increases. The near-source channel configuration is dominated by vertical isolation, increasing hydrodynamic enhancement in the middle section resulted in stacking and layering, while swaying isolation presents at far-source section. The channel connectivity generally follows a trending of poor, good and poor again as a function of hydrodynamic forces and configuration. Deepwater turbidite compound channels are characterized by configuration patterns and complex connectivity. Channel configuration and connectivity vary regularly with hydrodynamic changes.

Key words: deepwater turbidites, compound channels, connectivity models, reservoir configuration evolution, Niger Delta

CLC Number:

TE122

CHEN Xiao, BU Fanqing, WANG Hao, CHEN Guoning, ZHANG Xu. Characterization of Connectivity Models of Deepwater Turbidite Compound Channels in West Africa[J]. 西南石油大学学报(自然科学版), 2018, 40(6): 35-46.

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