考虑吸附相体积的页岩气储量计算方法  

Calculation of Shale Gas Reserves Based on the Volume of Adsorbed Gas

作　　者：熊钰[1] 熊万里[1] 刘启国[1] 余翔[2] 王中[3] 

机构地区：[1]西南石油大学石油与天然气工程学院,成都610500 [2]中国石油西南油气田分公司蜀南气矿,四川泸州646000 [3]中国石化中原石油勘探局采油四厂,河南濮阳457001

出　　处：《地质科技情报》2015年第4期139-143,共5页Geological Science and Technology Information

基　　金：国家重点基础研究发展计划(973)(2014CB239205)

摘　　要：页岩气赋存于发育大量天然微裂缝的页岩中,主要以吸附态和游离态2种形式存在。准确评价裂缝中自由气量对于页岩气井开采的早期评价具有明显的实用价值。从物质平衡原理出发,运用Langmuir吸附模型、Bangham固体变形理论,同时考虑基质孔隙体积和裂缝孔隙体积随地层压力的变化,以及吸附气所占体积对储量的影响,推导出了修正吸附相所占体积的页岩气藏物质平衡方程,并给出了线性化方法。计算结果表明,考虑了吸附气所占孔隙体积后,基质中自由气量比不考虑吸附相体积时减小,且吸附气量减小,裂缝中自由气量相对增加,总储量减小,使得计算模型更符合实际,计算结果更为准确。Shale gas mainly consists of two parts： the merous microfractures. The accurate evaluation of the adsorbed and free state in shale formation with nu free gas in the fracture is very important for the ear ly extraction of shale gas. Based on the material balance principle, Langmuir isotherm adsorption model, Bangham solid deformation theory, and the matrix system taken into consideration, the fracture system and the volume of adsorbed gas as the pressure changes, the material balance equation of shale gas is de- duced. The equation is linearized to a straight line. The result shows that with the volume of adsorbed gas involved, the free gas in the matrix decreases, as well as the adsorbed gas decreases, while the free gas in the fracture systems increases, and the original gas in place decreases. The model is more realistic and the result is more accurate than it used to be.

关 键 词：页岩气 储量计算 吸附相体积 

分 类 号：TE155[石油与天然气工程—油气勘探]