收稿日期: 2014-03-04
修回日期: 2014-05-07
网络出版日期: 2014-09-10
基金资助
国家重大科技专项（编号：2011ZX05033-3）;国家自然科学基金项目（编号：41302131，41362009）;中央高校基本科研业务费专项基金（编号：2012QNB32）|江苏省煤基CO2捕集与地质储存重点实验室开放基金项目（编号：2012KF04）联合资助.
Received date: 2014-03-04
Revised date: 2014-05-07
Online published: 2014-09-10
申建,秦勇，傅雪海，陈刚，陈润 . 深部煤层气成藏条件特殊性及其临界深度探讨[J]. 天然气地球科学, 2014 , 25(9) : 1470 -1476 . DOI: 10.11764/j.issn.1672-1926.2014.09.1470
Concept and evaluation indices of deep coalbed are essential for motivating deep coalbed methane research.Based on the analysis of ground stress,pore properties,gas content,reservoir physical and mechanical properties,it has shown that variations of proportion of different pore types of deep coal are very small,especially for mesopore to micropore.With the increase of coal burial depth,gas content increases firstly and then decreases.The inflexion point from gas content increasing to decreasing is defined as “critical depth”,and that is,the gas content decreases when the burial depth is deeper than the critical depth.Decimal logarithm of permeability is linearly negatively related to burial depth,which means that permeability of deep coal is probably very low.Elasticity modulus of coal are positively related to confining pressure and negatively related to temperature,and it also suggests that there is an “inflexion point” in the relation curve between elasticity modulus and burial depth.In further,indices of ground stress,saturated gas content,permeability were constructed to define the critical depth.Taking the Qinshui Basin as an example,the critical burial depth of deep coalbed is at 750m through calculations of the indices.It is suggested that reservoir condition changes a lot compared to shallow coalbed,and corresponding measures must be taken in coalbed methane development.
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