西南石油大学学报(自然科学版) ›› 2016, Vol. 38 ›› Issue (6): 138-146.DOI: 10.11885/j.issn.1674-5086.2014.08.07.02

• 石油与天然气工程 • 上一篇    下一篇

AS油田WY区特低渗透油藏水淹层评价方法

惠钢, 王友净, 闫林辉, 李佳鸿, 刘丽   

  1. 中国石油勘探开发研究院, 北京 海淀 100083
  • 收稿日期:2014-08-07 出版日期:2016-12-01 发布日期:2016-12-01
  • 通讯作者: 惠钢,E-mail:luckyhuigang@163.com
  • 作者简介:惠钢,1986年生,男,汉族,山东诸城人,工程师,硕士,主要从事油气田开发地质研究工作。E-mail:luckyhuigang@163.com;王友净,1973年生,女,汉族,山东博兴人,高级工程师,博士,主要从事油气田开发地质研究工作。E-mail:wangyoujing@petrochina.com.cn;闫林辉,1989年生,男,汉族,湖北枣阳人,硕士研究生,主要从事油气田测井方面的研究。E-mail:yanlinhui2009@sina.com;李佳鸿,1988年生,女,汉族,四川绵阳人,助理工程师,硕士,主要从事油气田开发地质研究工作。E-mail:lijia-hong@163.com;刘丽,1985年生,女,满族,辽宁葫芦岛人,博士研究生,主要从事储层地质研究工作。E-mail:liuli11505@163.com

Method for Water-Flooded Layer Evaluation in Extra-Low Permeability Reservoir in WY Block of AS Oilfield Flooded by Fresh-Water

HUI Gang, WANG Youjing, YAN Linhui, LI Jiahong, LIU Li   

  1. Research Institute of Petroleum Exploration and Development, PetroChina, Haidian, Beijing 100083, China
  • Received:2014-08-07 Online:2016-12-01 Published:2016-12-01

摘要: AS油田WY区特低渗透油藏的原始地层水矿化度很高,长期注淡水开发导致油层的电阻率呈现不对称U型曲线特征,强水淹油层的电阻率甚至高于原始油层的电阻率。特低渗透油藏水淹规律的影响因素复杂以及受储层本身特征的影响,适合中、高渗储层剩余油评价测井方法不适用于特低渗透水淹层评价。在岩电实验的基础上,明确了特低渗透油藏淡水驱水淹层机理。即当注入淡水的电阻率大于地层水电阻率时,且当其比值足够大时,水淹层电阻率明显高于原始油层,即出现U型曲线现象。根据常规测井曲线及岩芯分析资料,通过地层水矿化度与自然电位幅度、电阻率、声波时差等测井曲线组合进行了水淹层定性识别,探讨了地层混合液电阻率的求取方法,建立了淡水驱水淹层的定量解释模型。解释结果与试油投产符合率达85%以上。

关键词: 岩电实验, 特低渗透, 水淹层识别, 解释模型, 符合率

Abstract: The formation water is of extremely high salinity in the extra-low permeability reservoir in WY Block of AS Oilfield. After the long term water-flooding, the oil layer resistivity curves display an asymmetric U-Type and the resistivity of severely water-flooded oil layer exceeds that of original oil layer. The traditional logging evaluation approach for medium-high permeability reservoir does not apply to extra-low permeability reservoir, owing to the complicated factors of water flooding in the extra-low permeability reservoir and reservoir characteristics. The rock-electric experiment is carried out under the simulated reservoir conditions to indicate the logging mechanism of water flooding in the extra-low permeability reservoir. The resistivity value of water-flooded oil layer depends on the resistivity ratio between injection water and formation water. On the basis of logging data and core analysis, formation water salinity and SP, RT, AC logging data, the water-flooded oil layer can be identified and the mixed formation water resistivity can be obtained. The logging interpretation model is finally built up for the water-flooded layer and matches well with the actual production data.

Key words: rock-electric experiment, extra-low permeability, water-flooded layer identification, logging interpretation model, coincidence rate

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