1887

Abstract

Summary

After integrating results from all these methods, some interesting observations were found. Six facies were identified in the point bar strata studied, including massive sandstone with clasts at the base of point bar sequence, cross-stratified sandstone, various interbedded sandstone and siltstone unites that comprise IHS packages, and bioturbated siltstone and mudstone. The dips of IHS deposits were 3–8 degree with the average width of 80m. The thickest and coarsest-grained sediments were deposited near the channel-bend apex, occurring as a circular body when channel bends mainly increase in sinuosity. Extensive finer-grained deposits were accumulated in concave-bank areas when meanders migrated downstream, forming an elongate body parallel to the channel-belt axis. The numerical simulation suggested that channel belts with downstream translation constituted reservoir with higher recovery factors than those with only increase in sinuosity. The abandoned channel and IHS package were the main barriers or baffles in the meandering system. The width, dip angle of IHS package and the direction of water injection could all effect the final swept volume.

The study offers a comprehensive case study that helps geologists and reservoir engineers for better understanding the reservoir and optimizing production plan in the future. Moreover, it provides an integrated method for understanding and characterizing point bar reservoir in detail, which can be used in other similar oilfields.

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/content/papers/10.3997/2214-4609.201802193
2018-09-03
2024-03-29
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