致密油藏岩芯全尺度孔喉测试方法及应用

doi:10.11885/j.issn.1674-5086.2017.04.09.01

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (3): 97-104.DOI: 10.11885/j.issn.1674-5086.2017.04.09.01

致密油藏岩芯全尺度孔喉测试方法及应用

杨正明^1,2, 马壮志^1,3, 肖前华¹, 郭和坤^1,2, 骆雨田^1,2

1. 中国科学院渗流流体力学研究所, 河北廊坊 065007;
2. 中国石油勘探开发研究院, 河北廊坊 065007;
3. 中国科学院大学工程科学学院, 北京石景山 100049

收稿日期:2017-04-09 出版日期:2018-06-01 发布日期:2018-06-01
通讯作者: 杨正明,E-mail:yzmhxj@263.net
作者简介:杨正明,1969年生,男,汉族,江苏盐城人,研究院二级专家,博士,主要从事低渗/致密油气田物理模拟、渗流理论和三次采油方面的研究工作。E-mail:yzmhxj@263.net;马壮志,1991年生,男,汉族,山东东营人,硕士,主要从事油气田开发、储层评价方面的研究。E-mail:925500375@qq.com;肖前华,1987年生,男,汉族,重庆开县人,博士,主要从事致密油开发、微納孔隙渗流研究。E-mail:xqh159@gmail.com;郭和坤,郭和坤,1968年生,男,汉族,江苏省如皋市人,高工,硕士,主要从事油气层物理实验研究工作。E-mail:nmrghk69@petrochina.com.cn;骆雨田,1986年生,男,汉族,湖南常德人,工程师,硕士,主要从事低渗/致密油田开发方面的研究工作。E-mail:luoyutian@petrochina.com.cn
基金资助:
国家科技重大专项（2017ZX05013-001）；中国石油天然气集团公司重大基础科技攻关课题（2014B-1203）

Method for All-scale Pore-throat Measurements in Tight Reservoir Cores and Its Application

YANG Zhengming^1,2, MA Zhuangzhi^1,3, XIAO Qianhua¹, GUO Hekun^1,2, LUO Yutian^1,2

1. Institute of Porous Flow Mechanics of Chinese Academy of Sciences, Langfang, Hebei 065007, China;
2. PetroChina Research Institute of Petroleum Exploration & Development, Langfang, Hebei 065007, China;
3. School of Engineering Sciences, University of Chinese Academy of Sciences, Shijingshan, Beijing 100049, China

Received:2017-04-09 Online:2018-06-01 Published:2018-06-01

摘要/Abstract

摘要： 综合利用高压压汞、低温氮吸附及核磁共振与离心相结合等物理模拟实验方法，建立了致密油岩芯全尺度孔喉测试方法。在此基础上，对比了长庆、大庆外围和四川等致密油区岩芯的全尺度孔喉分布特征。研究表明：全尺度孔喉测试方法与常规单一微观孔喉结构测试方法相比，较准确地测得了致密岩芯中包含微米、亚微米和纳米级的孔喉分布。当岩芯越致密，与高压压汞测试方法相比，全尺度测试的纳米级喉道分布更精确。与中高渗岩芯相比，致密油藏岩芯的微米级孔喉控制的流体较少；而亚微米和纳米级孔喉控制的流体较多；与致密砂岩相比，致密灰岩孔喉分布孔喉分布图谱峰值偏左，且跨度大，表明其非均质强。在相同渗透率条件下，长庆比大庆致密岩芯的亚微米级孔喉多，纳米级孔喉少，说明长庆致密油藏的开发效果应好于大庆致密油藏的开发效果。

关键词: 致密油藏, 岩芯, 孔喉测试, 核磁共振, 高压压汞

Abstract: A method for all-scale pore-throat measurements in tight reservoir cores was established by combining high-pressure mercury injection porosimetry, low-temperature nitrogen adsorption measurements, nuclear magnetic resonance, and centrifugation. On this basis, we compared the characteristics of pore-throat distributions at all scales in tight reservoir cores acquired from Changqing, the periphery of Daqing, and Sichuan. Compared with conventional single-measurement methods for microscopic pore-throat structure, our method for all-scale pore-throat measurements is significantly more accurate in measuring the distribution of micron-, submicron-, and nanometer-grade pore-throats. In very tight cores, our all-scale method measures the distribution of nanometer-grade pore-throats more accurately than high-pressure mercury injection porosimetry measurements. In tight reservoir cores, a lower proportion of fluids is controlled by micron-grade pore-throats, whereas a larger proportion of fluids is controlled by submicronand nanometer-grade pore-throats, as compared to cores with moderate to high levels of permeability. In a comparison between tight sandstone cores and tight limestone cores, the spectral peaks of the latter's pore-throat distribution are biased to the left and exhibit large interpeak spans, thus indicating high levels of heterogeneity. At the same level of permeability, tight cores from Changqing have a larger number of micron-grade pore-throats and a smaller number of nanometer-grade pore-throats, as compared to tight cores from Daqing. It is thus shown that the development efficiency of tight reservoirs in Changqing is likely to be better than that of tight reservoirs in Daqing.

Key words: tight reservoirs, cores, pore-throat measurements, nuclear magnetic resonance, high-pressure mercury injection

中图分类号:

TE311

杨正明, 马壮志, 肖前华, 郭和坤, 骆雨田. 致密油藏岩芯全尺度孔喉测试方法及应用[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 97-104.

YANG Zhengming, MA Zhuangzhi, XIAO Qianhua, GUO Hekun, LUO Yutian. Method for All-scale Pore-throat Measurements in Tight Reservoir Cores and Its Application[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 97-104.

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致密油藏岩芯全尺度孔喉测试方法及应用

Method for All-scale Pore-throat Measurements in Tight Reservoir Cores and Its Application

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