Hierarchy Characterization of Intercalations in Branching-based and Wandering-based Braided River Reservoirs

doi:10.11885/j.issn.1674-5086.2016.07.12.02

Abstract

Abstract: Currently, research focus is on one general braided river model, disregarding other types of braided river models. Based on the literature survey and outcrop observations, the FN Oilfield, Sudan, was taken as an example. We analyzed the characteristics of the intercalation-hierarchy structures of the two types of braided river systems, namely, branching and meandering rivers, taking into account the hierarchical-constraint idea and the interface configuration of fluvial hierarchy proposed by Miall and others. The results show that the intercalation of branching braided-river systems includes flood plain deposits, mud filled or semi-filled channels, sedimentation layers, and fine sediment channels. The intercalation of wandering braidedriver systems only includes flood plain deposits and small amounts of mud semi-filled channels. Intercalations in different hierarchies and at various scales vary with respect to lithofacies type, development degree, thickness and horizontal character. This differs from each other in bottom-water reservoir method and the distribution of the remaining oil. In conclusion, we present a summary of five intercalation models that affect the distribution of the remaining oil in vertical configuration and the corresponding remaining oil-rich areas.

Key words: Sudan, braided river, branching-based, wandering-based, intercalation, hierarchy, remaining oil

CLC Number:

TE122

WANG Min, ZHAO Guoliang, SUN Tianjian, HUANG Tongfei. Hierarchy Characterization of Intercalations in Branching-based and Wandering-based Braided River Reservoirs[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 69-77.

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