摘要
与常规天然气储层相比,煤层气储层具有更复杂的孔隙结构。根据分形理论,推导了一种利用毛管压力曲线,采用导数法计算煤层孔隙分形维数的方法,并且对计算过程中的分段性进行了讨论。根据沁水盆地煤样的实测毛管压力曲线计算储层的分形维数,并对分形维数的影响因素进行了分析,发现不同煤阶的煤层样品具有不同的孔隙类型,分形维数有明显区别。
Coal bed has more complex pore structure compared with conventional natural gas reservoirs.A method of calculating pore fractal dimension is derived by using capillary pressure curves and derivative methods;and separate calculation is discussed.Based on the fractal dimension calculated by capillary pressure curves with coal sample of Qinshui Basin,the influence factors of fractal dimension is analyzed and it is found that different coal samples have different pore structures and fractal dimension is obviously different.
出处
《特种油气藏》
CAS
CSCD
北大核心
2013年第1期31-33,88,共4页
Special Oil & Gas Reservoirs
基金
国家"十二五"重大专项项目"山西沁水盆地南部煤层气直井开发示范工程(二期)"之专题"煤层气井压裂新技术研究"(2011ZX05060-002)
关键词
煤层气
孔隙结构
毛管压力
分形维
煤级
coal bed methane
pore structure
capillary pressure
fractal dimension
coal rank
