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Reservoir achitecture characterization and remaining oil distribution of meandering river
WANG Jue, GAO Xingjun, ZHOU Xinmao
(Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)
Abstract:
Our study area is the meandering river deposited in the Mighuazhen formation of the Dagang oilfiled. Based on core and logging data, the 3-D reservoir architecture delineation was conducted by identifying architecture elements and boundaries in single wells and among multiple wells. The results show that the point bar shows a fining-upward sequence including 2 scenarios for deposition:migrating laterally or in the downstream direction.The HIS package is obliquely oriented to the abandoned channel, composing a semi-connected sandbody. After abandonment, the abandoned channel is either isolated from or connected with the active channel, leading to two spatial distribution of meandering river sandbodies.The remaining oil of the point bar is basically concentrated in the upper part of the point bar, especially on the top of the IHS package. The point bar deposition mode also affects the remaining oil distribution.
Key words:  meandering river  reservoir architecture  geological database  lateral accretion mudstone  remaining oil  Dagang Oilfield