煤层气超临界吸附行为的蒙特卡罗方法研究综述

煤层气主要以吸附方式赋存在煤基质表面,煤层气的吸附主要有两个特点:第一,绝大部分煤层气吸附属于非均质吸附;第二,实际的煤储层温度在临界温度以上,在这种条件下的吸附与亚临界条件下的吸附有很大的不同,所以用亚临界条件下的吸附方程不能很好地描述煤层气的超临界吸附.在实验室研究过程中,既要模拟煤层气吸附的非均质性又要达到实际的超临界条件,是比较困难的.蒙特卡罗方法是通过计算机进行大量的随机抽样来解决问题,相比较其他的方法,用它来研究煤层气超临界吸附具有优势.概述了蒙特卡罗方法的历史,基本思路和特点,简述了利用蒙特卡罗的优势将其应用于煤层气超临界吸附特征研究的基本方法及应用效果.

A Review of Monte Carlo Method for the Supercritical Coalbed Methane Absorption

Coalbed methane exist on coal surface through the way of adsorption. The vast majority of coalbed methane absorption in the supercritical conditions is non-homogeneous absorption. We use sub-critical conditions of the adsorption equation can not describe the supercritical coal bed methane absorption well. It is also difficult to simulate the coalbed methane non-homogeneous absorption while reaching the actual supercritical conditions in laboratory. Monte Carlo method can solve the problem through a lot of random on computer. Therefore, it is superior to other methods that we use it to study supercritical coal bed methane absorption. This paper outlines the history, the basic ideas and features of the Monte Carlo method and summarizes its basic method and application which has been applied to the study of supercritical coal bed methane absorption characteristics with its advantages.