Reservoir architecture and remaining oil distribution in mouth bar—A case study on the braided delta of long-axis gentle slope in Zaonan fault block of Dagang Oilfield

Yin Senlin; Chen Gongyang; Dai Chunming; Wu Shenghe; Lu Fengming; Feng Wenjie

doi:10.11743/ogg20150413

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Reservoir architecture and remaining oil distribution in mouth bar—A case study on the braided delta of long-axis gentle slope in Zaonan fault block of Dagang Oilfield
Vol. 36, Issue 4, Pages: 630-639(2015)
Online First：08 August 2015，

Published：2015
DOI： 10.11743/ogg20150413
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DOI：

Yin Senlin, Chen Gongyang, Dai Chunming, et al. Reservoir architecture and remaining oil distribution in mouth bar—A case study on the braided delta of long-axis gentle slope in Zaonan fault block of Dagang Oilfield[J]. 2015, 36(4): 630-639. DOI： 10.11743/ogg20150413.

摘要

利用岩心、测井、地震及分析化验资料，综合层次分析、模式拟合及数值模拟等方法对河口坝内部储层构型模式进行研究，同时探讨了其内部夹层控制的剩余油分布特征。研究结果表明：受分流水道不同的沉积物卸载方式控制，河口坝内部夹层具有侧向叠置状及上拱状两种分布样式。侧向叠置状夹层样式在垂直物源方向呈一定倾角的侧向叠置状；上拱状夹层样式在垂直物源方向上呈多层隆升状。其中不同夹层分布样式的规模和方向存在较大差异。不同样式夹层剩余油富集方式存在差异。平行物源方向上，剩余油往往富集在夹层控制的注采不对应的前积体（增生体）内部，且其前端剩余油富集程度较高。垂直物源方向上，对侧向叠置状夹层样式来说，剩余油大量富集在坝主体内部夹层隔挡的侧积体内；对上拱样式来说，剩余油受水驱控制大量富集在拱状高部位。

Abstract

Cores

well logging and seismic and laboratory analysis data as well as hierarchical analysis

model fitting and numerical simulation methods

were used in the study of internal configuration and distribution of remaining oil controlled by intercalations in the mouth bar of Dagang Oilfield.Result shows that there are two intercalation distribution patterns in the mouth bar as the result of different unloading patterns of sediments in distributed channels

namely the lateral overlapping pattern and the upwarping pattern.The former presents itself as a lateral stack of intercalations with certain dips crossing source direction and the latter shows a parallel uplifting pattern of multiple intercalations crossing source direction.The scales and directions of different patterns vary greatly.Remaining oil distributions in intercalations of different patterns are different.Along the provenance direction

the oil gathered inside and at the front of prograding accretion formed within intercalations.When crossing the provenance direction

the oil accumulated in the lateral accretion bodies blocked by internal interlayers in the bar for the lateral overlapping pattern and in higher places for the upwarping pattern.