【作者】 石强；

【导师】 潘一山； 李成全；

【作者基本信息】 辽宁工程技术大学 ， 固体力学， 2006， 硕士

【摘要】 煤层气(俗称瓦斯)是赋存于煤层中可以代替和优于天然气的宝贵矿产资源。在世界范围内,其总储量超过天然气,开发潜力巨大。然而,在我国复杂地质条件下,煤层气还不能形成工业开采的主要目的是对煤体内部结构特性和煤层气(水)在煤层中流动机理还不够清楚,煤层气的富集高产规律认识还不够深入。因此,对煤体结构及水-气在煤体内渗流特性进行研究,具有重要意义,核磁共振成像技术使这一思路具有了可行性。本文在前人的基础上,通过实验对煤体结构特性、煤层气吸附解吸规律及水-气在煤体中渗流过程等方面进行了研究。首先,针对大型核磁共振仪对置于其中的设备应保证绝对无磁的要求,同时为模拟煤体在地下所处的应力状态,研制了可以对试件施加轴压、围压及孔隙压的自压式非磁性三轴应力渗透仪; 其次,通过对真空水饱和煤试件的核磁共振图像的研究,直接观察煤体的结构特性,并通过数值模拟软件的图形处理模块分析煤体内部主裂隙的分布情况,并通过改变轴压、围压等条件发现,煤体裂隙随轴压、围压的增大而减小,不受孔隙压的影响; 通过改变围压、轴压、孔隙压和饱和度等参数的常规实验,得出煤层气吸附解吸量随轴压、围压的增加而减少,随孔隙压的增加而增加; 通过对煤试件进行水-气两相渗流的核磁共振实验,得到水在煤体中向前推进的渗流过程。本文所进行的煤体核磁共振成像实验研究,到目前为止未见到相关报道,实验研究使煤体层理结构和水-气渗流过程实现了可视化。为搞清煤体内部结构特性和煤层气(水)在煤层中流动机理奠定了基础。为进行煤层气开发、开采向前迈出了重要的一步。更多还原

【Abstract】 The coal bed is mad (popular name gas) is the tax saves in the coal bed may replace and surpass the natural gas the precious mineral resource. In the world scope, its ultimate reserves surpasses the natural gas, the development potential is huge. However, under our country complex geology condition, the coal bed is mad cannot form industry mining the main goal is to the coal body internal structure characteristic and the coal bed is mad (water) moves the mechanism in the coal bed average insufficiently is also clear, the coal bed is mad concentrates the high production rule understanding insufficiently is also thorough. Therefore, to the coal body structure and the water -is mad conducts the research in the coal in vivo transfusion characteristic, had the vital significance, the nuclear magnetic resonance imagery technology enable this mentality to have the feasibility. This article in predecessor’s foundation, through the experiment to the coal body structure characteristic, the coal bed is mad the tax saves the migration rule and the water -is mad in the coal body aspect and so on transfusion process conducted the research. First, in view of the large-scale nuclear magnetic resonance meter opposition to equipment should guarantee absolutely does not have the magnetism the request, simultaneously for simulates the test sample in the stress condition which underground locates, developed may exert the axis to the test sample presses, encircles presses and the hole presses from presses the type non-magnetism three-dimensional stress seeps the meter; Next, through to the vacuum water saturated coal test sample nuclear magnetic resonance picture research, the direct observation coal body structure characteristic, and does not simulate software through the value the graph processing module analysis coal body interior host crevasse distributed situation, and presses through the change axis, encircles presses and so on the condition discovers, the coal body crevasse presses along with the axis, encircles presses increases reduces, influence which is pressed the hole; Through encircles the pressure, the axis pressure, the hole by the gradient form change presses with parameter the and so on degree of saturation conventional experiment, obtains the coal bed is mad the adsorption-desorption quantity presses the increase along with the axis which, encircles presses reduces, presses along with the hole the increase increases; Through enters the running water to the coal test sample -is mad two transfusions the nuclear magnetic resonance experiments, obtain the water the transfusion process which prompts forward in the coal body. This article carries on the coal body nuclear magnetic resonance imagery experimental study, up to now not sees the correlation report, the experimental study causes the coal body bedding structure and the water -is mad the transfusion process realized visibly. In order to clarify the coal body internal structure characteristic and the coal bed is mad (water) moved the mechanism in the coal bed average establishes the foundation. In order to carry on the coal bed is mad the development, mining stepped out to front to be important one step.更多还原