西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

河口坝储层内部结构及对剩余油分布的影响

杨圣贤*,严科   

  1. 中国石化胜利油田分公司胜利采油厂,山东东营257051
  • 出版日期:2016-08-01 发布日期:2016-08-01
  • 通讯作者: 杨圣贤,E-mail:yangshengxian.slyt@sinopec.com
  • 基金资助:

    国家科技重大专项(2016ZX05011);中国博士后科学基金资助项目(2012M511542)。

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

YANG Shengxian*, YAN Ke   

  1. Shengli Oil Recovery Plant,Shengli Oilfield Company,SINOPEC,Dongying Shandong 257051,China
  • Online:2016-08-01 Published:2016-08-01

摘要:

为了揭示河口坝储层内部结构,提高剩余油描述的精度,指导油藏开发调整,以胜坨油田沙二段8 砂组三角
洲前缘储层为例,利用密井网条件下的构型分析方法,对河口坝储层进行了分析。研究认为,河口坝储层中发育的沉
积界面可分为5 级:第5 级界面限定河口坝复合体,为稳定分布的泥岩,厚度较大,顶界呈水平产状,底界呈S 形产状;
第4 级界面限定单一河口坝,主要为泥质或钙质非渗透层,在坡折带呈倾斜产状,在湖底平原呈近水平产状,单一河口
坝具有S 型前积结构和“同期不同体”分布特征;第3 级界面限定单一河口坝内部的增生体,主要为薄泥质夹层,与第
4 级界面有斜交和平行两种产状,增生体具有S 型和斜交型两种前积结构。特高含水后期,河口坝储层内部结构特征
对剩余油分布的控制作用明显,普遍分布的S 型前积结构主导了剩余油的低饱和度均匀分布,局部存在的斜交型前积
结构主导了剩余油的差异分布,同期不同体结构主导了剩余油的局部富集。

关键词: 河口坝, 沉积界面, 结构单元, 前积结构, 剩余油

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

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