梁灿^1,5,,
肖立志^1,2,,,
周灿灿³,
郭龙⁴,
胡法龙³,
廖广志¹,
宋先知¹,
戈革¹
1. 油气资源与探测国家重点实验室, 中国石油大学(北京), 北京 102249
2. Harvard SEAS-CUPB Joint Lab. on Petroleum Science, Cambridge, MA 02138, USA
3. 中国石油勘探开发研究院, 北京 100083
4. 中国科学院深圳先进技术研究院, 广东深圳 518000
5. 常州工学院土木建筑工程学院, 江苏常州 213000

基金项目: 国家自然科学基金（21427812）和"111计划"（B13010）资助的项目


详细信息

作者简介: 梁灿, 女, 1989年生, 博士, 主要从事岩石物理、核磁共振方法及测井储层评价研究.E-mail:liangcan8515296@126.com

通讯作者: 肖立志, 男, 1962年生, 教授, 主要从事低场核磁共振、岩石物理、地球物理测井等方面的研究及教学工作.E-mail:xiaolizhi@cup.edu.cn; lizhi_xiao@fas.harvard.edu

中图分类号: P631

收稿日期:2018-04-28
修回日期:2019-08-23
上线日期:2019-11-05

Nuclear magnetic resonance characterizes rock wettability: preliminary experimental results

LIANG Can^1,5,,
XIAO LiZhi^1,2,,,
ZHOU CanCan³,
GUO Long⁴,
HU FaLong³,
LIAO GuangZhi¹,
SONG XianZhi¹,
GE Ge¹
1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2. Harvard SEAS-CUPB Joint Lab. on Petroleum Science, Cambridge, MA 02138, USA
3. Research Institute of Petroleum Exploration and Development, Beijing 100083, China
4. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences, Shenzhen Guangdong 518000, China
5. College of Civil and Architectural Engineering, Changzhou Institute of Technology, Changzhou Jiangsu 213000, China


More Information

Corresponding author: XIAO LiZhi,E-mail:xiaolizhi@cup.edu.cn; lizhi_xiao@fas.harvard.edu

MSC: P631

--> Received Date: 28 April 2018
Revised Date: 23 August 2019
Available Online: 05 November 2019


摘要
摘要:随着石油勘探开发领域的不断扩大，某些复杂油气藏尤其是致密油气的岩石物理响应，受岩石润湿性变化的影响越来越明显，影响油气藏的评价以及后续勘探开发，识别和评价岩石润湿性成为重要的研究课题.核磁共振弛豫可以有效表征多孔介质孔隙及其流体分布，特别是通过T₁-T₂弛豫图谱能够获得流体分子与孔隙表面相互作用的信息，进而为孔隙表面润湿性质的判断提供了可能性.本文首先讨论了T₁-T₂弛豫谱表征孔隙介质润湿强度的理论基础，然后，采用一阶近似方法对孔隙表面流体分子的核磁共振弛豫分布进行正演模拟，建立T₁/T₂比值法判别孔隙介质润湿性的基本方法.最后，选取玻璃珠和天然砂岩样品进行初步实验，验证方法的合理性.结果表明，当岩石饱和双相流体时，润湿相流体T₁/T₂值高于非润湿相流体，通过观察不同饱和度状态T₁-T₂二维图谱的变化，能够判断岩石的润湿性.本文的理论分析与初步实验结果为岩石润湿性研究提供了新的手段，对核磁共振测井探测储层润湿性也具有一定的应用价值.
关键词: 储层岩石/
润湿性/
核磁共振/
T₁-T₂二维弛豫谱/
T₁/T₂比值

Abstract:With expansion of oil exploration and development fields, the influence of wettability on petrophysical parameters in complicated reservoirs is getting increasingly evident, which affects reservoir evaluation and subsequent exploration and development. Thus, rock wettability identification and evaluation has become an important research topic. Nuclear Magnetic Resonance (NMR) relaxation can effectively characterize pores and fluid distribution in porous media. In particular, the interaction strength between pore surface and fluid molecules could be obtained through T₁-T₂ correlation spectra, which provides a possibility to judge the wettability of pore surface. In this paper, the theoretical basis that T₁-T₂ correlation was used to characterize the wetting features of porous media is discussed. Then, the relaxation correlation of fluid molecules on pore surface is simulated by the first order approximation method. And the basic method for distinguishing the wettability is established using T₁/T₂ ratio. Finally, glass beads and reservoir sandstone samples are selected for preliminary NMR experiments to verify the validity of the method. The results show that the T₁/T₂ ratio of the wetting-phase fluid is higher than that of the non-wetting phase fluid when rocks are saturated with two-phase fluids. Rock wettability is determined by observing the changes of T₁-T₂ correlation spectra in different saturation states. The theoretical analysis and preliminary experimental results in this paper provide a novel method for the study of rock wettability, and have certain application value in the detection of reservoir wettability via NMR logging.
Key words:Reservoir rocks/
Wettability/
NMR/
T₁-T₂ correlation/
T₁/T₂ ratio



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