煤层

In vitrain bands the density and fractal dimension of fractures related to the thickness and lithotyp...

煤岩结构研究在预测煤层渗透性方面有重要意义。

The relationship between microlithotype and the distribution of cleat in coal bed is discussed through a case from Hedong coalfield, combining microstratigraphy and statistics methods.

摘要综合利用显微地层计方法，以河东煤田中北部8＃煤层为例，研究了煤层显微煤岩类型与煤层裂隙分布关系。

The Coal Measures Strata are divided into 1 super-sequence and 3 sequences on the basis of paleostructure surface,widespread overlap unconformability,coal seam,and channel lag deposit.

根据构造运动面、大面积超覆界面、煤层河床滞留沉积将含煤岩系划分为1个超层序3个层序。

There is a coal layer on the clay of direct roof.This layers is unstable and easy tofall down after mining and enable the gas to gush out.

团溪直接顶板粘土之上有一煤层，且不稳定，采后容易垮落，造成瓦斯涌出。

The in situ rock stress prevents the rise of confined water and water inrush for thick floor aquifuge,but for thin floor aquifuge the in situ rock stress wo.

介绍了水力压裂应力测量原理现场测量结果,论述了煤层底板隔水层带阻水机理承压水沿煤层上升机理,以及原岩应力、水压与裂隙扩展关系。