孤岛、孤东油田馆上段微相特征与剩余油分布

蔡忠

doi:10.11743/ogg20000315

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孤岛、孤东油田馆上段微相特征与剩余油分布
CHARACTERISTICS OF MICROFACIES AND DISTRIBUTION OF REMAINING OIL IN UPPER MEMBER OF GUANTAO FORMATION FROM GUDAO AND GUDONG OILFIELDS
2000年21卷第3期页码：256-258
网络首发：2000-09-25，

纸质出版：2000
DOI： 10.11743/ogg20000315
稿件说明：

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蔡忠. 孤岛、孤东油田馆上段微相特征与剩余油分布[J]. 石油与天然气地质, 2000,21(3):256-258. DOI： 10.11743/ogg20000315.

Cai Zhong. CHARACTERISTICS OF MICROFACIES AND DISTRIBUTION OF REMAINING OIL IN UPPER MEMBER OF GUANTAO FORMATION FROM GUDAO AND GUDONG OILFIELDS[J]. 2000, 21(3): 256-258. DOI： 10.11743/ogg20000315.

摘要

孤岛、孤东油田馆陶组上段为河流相沉积

发育的微相主要有心滩、边滩、谷底滞留沉积、天然堤、决口扇、河漫湖泊、河漫滩等。岩性以砂岩、粉砂岩为主

成分成熟度中等偏低

小型交错层理较发育

平面上呈连片条带状

垂向上呈板状或不对称透镜状

1～4砂组为曲流河沉积

5～6砂组为辫状河沉积

储层物性好

孔隙度大

渗透率高

不同微相储层物性有所差别。沉积相带控制了水洗过程中物性的变化

使孔隙度和渗透率显著增加

控制了驱油效率的大小。由于心滩和边滩水驱油较充分

剩余油相对较少

河漫滩和天然堤驱油效率低

剩余油相对富集

所以微相的展布影响着剩余油的分布;正韵律油层上部大都动用较少

以弱见水为主、剩余油较多。

Abstract

The upper member of Guantao Formation consists mainly channel bar

point bar

arrested deposits on valley floor

natural levee

crevasse splay

alluvial lake and alluvial flat microfacies.The diposits are principally sandstone and siltrock with mid lower composition maturity and small cross bedding.1～4 sand set are meandering stream deposits

5～6 sand sets are braided channel deposits.The reservoirs of the study area have good physical property

big porosity and high permeability.Sedimentary facies zones controlled the variation of the physical property and improved the porosity and permeability.The channel bars and point bars contain less remaining oil

but alluvial flats and natural levee have relatively rich remaining oil.