温度对流体及其在孔隙介质中核磁共振弛豫影响研究进展  

Progress of temperature effect on NMR relaxation of bulk fluid and porous medium

作　　者：成家杰[1] 谢真 廖广志[2] 徐大年[1] 张国华[1] 罗嗣慧 张陆 肖立志[2] CHENG JiaJie;XIE Zhen;LIAO GuangZhi;XU DaLian;ZHANG GuoHua;LUO SiHui;ZHANG Lu;XIAO LiZhi(China Oilfield Services Limited,Langfang 065201,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中海油田服务股份有限公司,廊坊065201 [2]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

出　　处：《地球物理学进展》2023年第4期1551-1562,共12页Progress in Geophysics

基　　金：国家重点研发计划课题(2019YFA0708301);国家自然科学基金(51974337);中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项(ZLZX2020-03);中国石油大学(北京)科研基金资助(2462020YXZZ007)联合资助。

摘　　要：研究温度如何影响流体以及在孔隙介质中的弛豫时间对准确利用井下高温核磁共振数据进行原油黏度评价、储层物性评价等十分必要.对于自由状态液体,在不含顺磁性物质时其弛豫机制主要来自于分子内核自旋间的偶极-偶极相互作用,本文概述了由这种相互作用导出的自由流体弛豫BPP理论,总结归纳了依据BPP理论建立的原油弛豫时间与黏度、温度相关的经验模型;当原油中含有沥青时,由于沥青基团内包含顺磁离子,弛豫机制发生转变,基于此本文分析了含沥青原油弛豫机理以及核磁共振随温度变化的响应特征.在表面含微量顺磁离子的孔隙介质中,表面弛豫一般主导核磁共振响应,本文详细介绍了表面弛豫理论发展历程以及各类理论在温度影响表面弛豫方面给出的不同观点,特别是基于Korb模型具体分析了不同类型流体在玻璃珠表面弛豫时间具有不同温度特性的原因.此外对于具有多种造岩矿物和复杂孔隙结构的岩石孔隙,弛豫受温度影响机制复杂,本文概述了岩石孔隙流体弛豫时间受温度影响的实验探索进展并指明其中存在的问题,展望了未来的发展方向.It is necessary to study how the temperature affects the bulk relaxation and the relaxation of fluids in porous medium for the evaluation of crude oil viscosity and reservoir physical properties using downhole Nuclear Magnetic Resonance(NMR)data.In the absence of paramagnetic substances,the relaxation mechanism mainly comes from the dipole-dipole interaction between nuclear spins in molecules.This paper summarizes the BPP theory of bulk relaxation derived from dipole-dipole interaction,and generalizes the empirical model of crude oil relaxation time related to viscosity and temperature based on the BPP theory.When the crude oil contains asphaltene,the relaxation mechanism changes due to the paramagnetic ions contained in the bitumen group.Based on this,the relaxation mechanism of the bituminous crude oil and the response characteristics of NMR with temperature are analyzed.This is of great significance for us to use nuclear magnetic resonance logging to establish the viscosity evaluation model of bituminous crude oil and identify reservoir asphaltenes.In porous media containing trace paramagnetic ions on the surface,surface relaxation generally dominates the NMR response.Therefore,this paper introduces the development history of surface relaxation theory and the different viewpoints given by these various theories on the effect of temperature on surface relaxation.In particular,based on the Korb model,we analyzed the reasons why the relaxation time of different types of fluids have different temperature characteristics on the surface of glass beads.This can guide us to further understand how temperature affects the pore relaxation time of reservoir rocks.However,the actual reservoir rock has a variety of rock-forming minerals and complex pore structure,so the relaxation mechanism itself is very complicated,and it is difficult to study how the temperature affects the relaxation time.This paper summarizes the progress in the experimental exploration that how temperature affects fluid relaxation time in rock pores,p

关 键 词：温度 自由流体 孔隙介质 核磁共振 弛豫 

分 类 号：P631[天文地球—地质矿产勘探]