摘要
为了揭示与煤层气高效开发中储层多相流作用等科学问题,需要探索一种针对性的煤储层特性无损分析新技术。从理论和技术2个角度讨论了核磁共振弛豫时间分析技术在煤储层岩石物理及流体分析中的应用,研究建立了基于低场核磁共振的煤的孔隙度、渗透率、孔隙结构、润湿性、甲烷等温吸附曲线的精细定量综合表征技术体系;论证了采用核磁共振弛豫分析来有效识别煤中"多态甲烷"(游离态、吸附态和孔束缚态)和"多态水"(表面吸附态、孔内毛管束缚态和自由态水)的理论与方法;提出了注CO_2置换煤层流体效率的理论评价模型。为进一步开展煤层气开发过程中气、水多相介质相互作用与储层综合动态研究提供了技术保障。
In order to disclose the key scientific issues relating to reservoir fluid interactions during the production of coalbed methane,it is necessary to develop a new,special,and non- destructive methodology for analyzing coal reservoir properties. This authors,from theoretical and technical aspects,reviewed the current state of the art in the petrophysics and fluid properties evaluation of coalbed methane reservoir by using NMR relaxation time analysis. Three major achievements were obtained. Firstly,several models and methodology were built for quantitative characterization of coal porosity,permeability,pore size distribution,wettability,and methane isothermal adsorption curve of coal. Secondly,the theoretical basics and applications for quantitative identification of multi- phase（ bulk-,coal adsorbed-,and porous medium confined-） methane and multi- phase（ bulk-,capillary-,and adsorbed-） moistures in coals were verified. Lastly,a quantified model to evaluate the efficiency of water replacement by CO_2 injection was provided. The above achievements can provide certainly supports for the further researches of the potential interaction mechanisms and multiple geological effects resulting from the interactions of multi- phased gas and water during gas production.
出处
《煤炭科学技术》
CAS
北大核心
2016年第6期14-22,共9页
Coal Science and Technology
基金
国家自然科学基金资助项目(41472137)
全国优秀博士学位论文作者专项资助项目(201253)
关键词
煤层气
煤储层
储层物性
低场核磁共振
横向弛豫时间
coalbed methane
coal reservoir
reservoir physical properties
low-field NMR
transverse relaxation time
