Micro-remaining oil distribution simulation test of fan delta reservoir

被引：0

作者：

Liu T.-X. ^{[1
]}

Xu H.-M. ^{[2
]}

机构：

[1] School of Geosciences in China University of Petroleum

[2] College of Geosciences in China University of Petroleum

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2011年 / 35卷 / 04期

关键词：

Fan delta; Image analysis; Lithofacies unit; Micro-remaining oil; Photo lithography model;

D O I：

10.3969/j.issn.1673-5005.2011.04.004

中图分类号：

学科分类号：

摘要：

Microscopic pore structure in different types of lithofacies units of fan delta reservoir in the first member of Kongdian group was characterized by photo lithography model and image analysis system in a block of Kongnan area, Dagang Oilfield. The distribution of micro-remaining oil was simulated by constant pressure water injection and pressure-swing water injection. The experimental progresses were recorded and the pictures were taken. The distribution modes of micro-remaining oil in different types of lithofacies units during the waterflood test were analyzed quantitatively and qualitatively, thus the controlling factors for remaining oil distribution were discussed. The results show that the distribution shapes of micro-remaining oil in fan delta reservoir mainly include island remaining oil by blocking in the disconnected pore, accounting for about 75% of all remaining oil, flake remaining oil by interrupting in the small pore and throat, about 20% of all remaining oil, and the beadlike and membranous remaining oil, less than 5% of all remaining oil. The controlling factors for oil displacement efficiency and remaining oil distribution in different types of lithofacies units are mainly pore structure, oil displacement pressure, displacement flow and flow velocity. Pore structure is the fundamental factor influencing oil displacement efficiency under the condition of constant pressure. Oil displacement pressure and oil displacement pattern are the key factors influencing oil displacement efficiency, and increasing pressure and using pressure-swing water injection can increase the oil displacement efficiency by one time.

引用

页码：20 / 26

页数：6

共 12 条

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