不同渗透率岩芯孔径分布与可动流体研究

doi:10.11885/j.issn.1674-5086.2016.04.25.01

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (2): 91-97.DOI: 10.11885/j.issn.1674-5086.2016.04.25.01

不同渗透率岩芯孔径分布与可动流体研究

宁宁^1,2, 李怡超^1,2, 刘洪林^1,2,3, 周尚文^1,2,3

1. 中国石油勘探开发研究院廊坊分院, 河北廊坊 065007;
2. 中国科学院大学, 北京石景山 100049;
3. 国家能源页岩气研发(实验)中心, 河北廊坊 065007

收稿日期:2016-04-25 出版日期:2018-04-01 发布日期:2018-04-01
通讯作者: 宁宁,E-mail:ningn@petrochina.com.cn
作者简介:宁宁,1964年生,男,汉族,辽宁朝阳人,教授级高级工程师,博士,主要从事油气勘探与油气地质研究。E-mail:ningn@petrochina.com.cn;李怡超,1988年生,男,汉族,陕西西安人,硕士研究生,主要从事储层微观特征研究。E-mail:liyichao190@163.com;刘洪林,1973年生,男,汉族,山东济宁人,高级工程师,博士,主要从事非常规油气勘探开发研究工作。E-mail:liuhonglin69@petrochina.com.cn;周尚文,1987年生,男,汉族,湖北荆州人,工程师,硕士,主要从事核磁共振技术在油气藏中的应用研究。E-mail:zhoushangwen10@petrochina.com.cn
基金资助:
国家科技重大专项（2011ZX05013-006）；国家重点基础研究发展计划（973计划）（2013CB2281）

Study on Influence of Permeability and Distribution of Pore Diameters in Rock Cores on Measurement of Mobile Fluid Saturation

NING Ning^1,2, LI Yichao^1,2, LIU Honglin^1,2,3, ZHOU Shangwen^1,2,3

1. Research Institute of Petroleum Exploration & Development-Langfang, PetroChina, Langfang, Hebei 065007, China;
2. University of Chinese Academy of Sciences, Shijingshan, Beijing 100049, China;
3. National Energy Shale Gas R & D(Experiment) Center, Langfang, Hebei 065007, China

Received:2016-04-25 Online:2018-04-01 Published:2018-04-01

摘要/Abstract

摘要： 为了解释通过压汞毛管压力曲线计算原始含油饱和度偏大的原因，对所选择的样品分别进行核磁共振、高速离心以及常规压汞实验，并将实验结果进行对比，分析了不同孔径区间核磁可动流体饱和度和压汞进汞饱和度的区别并解释了其原因。实验结果表明：超低渗储层岩芯（0.1 mD < K < 1.0 mD）的压汞进汞饱和度要明显大于核磁共振可动流体饱和度，分析认为出现这种差别的主因是小喉道所控制的核磁可动流体体积与压汞进汞量差别较大造成的；特低渗储层岩芯（1.0 mD < K < 10.0 mD）的压汞进汞饱和度可能依然高于核磁共振可动流体饱和度；渗透率较大的储层岩芯（渗透率K>10.0 mD）的总核磁可动流体饱和度与压汞进汞饱和度相差不大，压汞进汞体积与核磁可动流体均主要分布在半径大于1.00 μm的喉道区间中。

关键词: 核磁共振, 常规压汞, 砂岩, 可动流体饱和度, 原始含油饱和度

Abstract: To understand why the calculation of original oil saturation through mercury injection capillary pressure (MICP) curves always yields excessively large values, we measured the mobile fluid saturation of a set of selected samples using nuclear magnetic resonance (NMR), high-speed centrifugation, and conventional mercury injection experiments. Comparisons were then performed to analyze how the mobile fluid saturation in different pore diameter ranges differed from the MICP-measured value of mobile fluid saturation, to reveal the underlying causes of these differences. The experimental results indicated that, in ultralow-permeability reservoir cores (0.1 mD < K < 1.0 mD), MICP-measured saturation was significantly larger than NMRmeasured mobile fluid saturation. Our analysis revealed that this was caused by differences in the quantity of injected mercury and the volume of mobile fluids (as measured by NMR), because of the restrictions imposed by small pore throats. In lowpermeability reservoir cores (1.0 mD < K < 10.0 mD), MICP measurements of mobile fluid saturation may still result in larger values than the corresponding NMR measurements. In reservoir cores with high levels of permeability (K > 10.0 mD), the difference between the MICP-measured saturation and the total mobile fluid saturation was relatively small. In this case, it was found that both the injected mercury and mobile fluids were mainly distributed within pore throats with radii greater than 1.00 μm.

Key words: NMR, conventional MICP measurements, sandstones, mobile fluid saturation, original oil saturation

中图分类号:

TE311

宁宁, 李怡超, 刘洪林, 周尚文. 不同渗透率岩芯孔径分布与可动流体研究[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 91-97.

NING Ning, LI Yichao, LIU Honglin, ZHOU Shangwen. Study on Influence of Permeability and Distribution of Pore Diameters in Rock Cores on Measurement of Mobile Fluid Saturation[J]. 西南石油大学学报(自然科学版), 2018, 40(2): 91-97.

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不同渗透率岩芯孔径分布与可动流体研究

Study on Influence of Permeability and Distribution of Pore Diameters in Rock Cores on Measurement of Mobile Fluid Saturation

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