摘要
页岩气藏中天然气赋存形式不仅包括游离形式,还有吸附形式。对于页岩气藏,准确识别气藏中两种气体状态的相对多少,对认识气藏开发动态具有重要意义。常规岩心实验认识气藏赋存特征不仅成本较高,而且操作繁琐,误差难以控制。为此,根据物质平衡原理,分别建立了页岩单纯介质定容气藏、页岩单纯介质封闭气藏和页岩双重介质封闭气藏的物质平衡方程,并结合页岩气藏的生产特点,提出了页岩气藏游离气量和解吸气量的计算方法,最后进行了计算实例分析。该方法避免了模拟实验的繁琐和误差,简单实用,是页岩气藏动态分析的有效手段。
The existence of natural gas in unconventional reservoirs includes free and absorbent modes. The accurate recognition of the relative quantity of the two kinds of natural gas plays an important role in knowing the production performance of unconventional gas reservoirs. Conventional core experiments aiming at obtaining the existence characteristic of the reservoir gas are expensive and cumbersome in operation,with the error hardly controlled.For this purpose,the material balance equations of unconventional pure-porosity-media constant-volume gas reservoirs,unconventional pure-porosity-media confined gas reservoirs and unconventional dual-porosity-media constantvolume gas reservoirs were established based on the principle of mass conservation,and the method for calculating the volume of free gas and desorbed gas was proposed according the production performance characteristic of unconventional gas reservoirs,which was demonstrated by an calculation example in second part. The method proposed in this paper avoids the complexity and error of core experiments and can be used to analyze the production performance of unconventional gas reservoirs.
出处
《科学技术与工程》
北大核心
2015年第29期33-38,共6页
Science Technology and Engineering
基金
国家科技重大专项(2011ZX05013-003)资助
关键词
页岩气藏
游离气
吸附气
解吸附
物质平衡
shale gas reservoirs free gas absorbed gas desorbed gas material balance
