The Inner Architecture of Debouch Bar Reservoir and its Influence on#br#
Remaining Oil Distribution

doi:10.11885/j.issn.1674-5086.2014.06.26.04

Abstract

Abstract:

In order to reveal the inner structure of debouch bar reservoir，to enhance the accuracy of remaining oil description，
and to guide reservoir development and adjustment，a typical debouch bar of delta front reservoir in the Es2−8 Formation of
Shengtuo Oilfield was characterized by close spacing architectural analysis. The study shows that the depositional interfaces
in debouch bar can be classified into 5 levels. The fifth level interface restricts the composite debouch bar，which is thick
stable mudstone. The top boundary of the fifth level interface presents a nearly horizontal attitude，and the bottom boundary
presents an S shape attitude. The fourth level interface restricts the single debouch bar，which is mainly the muddy or calcareous
intercalation with inclined attitude in the slope break belt，and a nearly horizontal attitude in the lake floor plain. The S shape
foreset configuration and the independent sand body in contemporaneous deposit are the essential architectural features of the
single debouch bar. The third level interface restricts the accretion sand body in the single debouch bar，the attitude of which
is oblique or parallel with the fourth level interface. There are two kinds of foreset configuration in the accretion sand body. S
shape and oblique crossing shape. At the later stage of extra-high water cut，the inner structure of the debouch bar reservoir
displays a very high efficiency control effect on remaining oil distribution. The ubiquitous S shape forest configuration controls
the low saturation and homogeneous distribution of the remaining oil；the regional oblique crossing shape foreset configuration
controls the differential distribution of the remaining oil，and the architecture of independent sand body in contemporaneous
deposit controls the sectional enrichment of the remaining oil.

Key words: debouch bar, depositional interface, architecture unit, foreset configuration, remaining oil

CLC Number:

TE122

YANG Shengxian*, YAN Ke. The Inner Architecture of Debouch Bar Reservoir and its Influence on#br# Remaining Oil Distribution[J]. 西南石油大学学报(自然科学版), 2016, 38(4): 56-62.

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The Inner Architecture of Debouch Bar Reservoir and its Influence on#br# Remaining Oil Distribution

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