以相对瓦斯涌出量为刻度值评价煤层气资源初探——基于地质类比法对比阜新与合山煤田煤层气开发

Evaluation of CBM Resource Potential in Heshan Coalfield Based on Geological Analogy——Comparison of Coal-Bed Methane Development in Fuxin And Heshan Coal Fields Based on Geological Anomaly

分析广西合山煤田煤层气资源开发前景,为广西合山煤层气预查项目立项提供依据。采用地质类比法,从煤炭保有资源量、煤层气含量、预测煤层气资源量和相对瓦斯涌出量、煤层气可采系数5个维度,将辽宁阜新煤田刘家区矿区和广西合山进行比对,评价合山煤田煤层气资源前景。可采煤层气资源量计算系数的确定,一般采用国内外的经验数据40%,阜新瓦斯相对涌出量较高平均为26.06m^3/t·d,合山平均为23.06m^3/t·d,是阜新的88.49%,类比分析合山的煤层气可采资源量系数为35.40%,预测合山煤层气资源量为63.498×10^8m^3,估算合山可采煤层气资源量22.478×10^8m^3,比阜新多6.158×10^8m^3。利用开采煤矿相对瓦斯涌出量作为可采煤层气资源量计算系数的刻度值,是本研究的创新点。其效果如何,有待今后进一步研究和验证。总之,本研究表明合山煤田具备勘查开发煤层气的可能性。

The development prospect of coalbed methane resources in Heshan coalfield of Guangxi was analyzed,which provided the basis for the establishment of the project of coalbed methane prediction in Heshan coalfield of Guangxi.By using geological analogy method,this paper compared Liujia mining area of Fuxin coalfield in Liaoning Province with Heshan in Guangxi Province,and evaluated the prospects of coalbed methane resources in Heshan coalfield,based on the five dimensions of coal reserves,coalbed methane content,predicted coalbed methane resourc?es and relative gas emission,and coalbed methane recovery coefficient.The calculation coefficients of recoverable coalbed methane resources are generally determined by 40%empirical data at home and abroad,26.06m^3/t·d for Fux?in,23.06m^3/t·d for Heshan,88.49%for Fuxin,35.40%for Heshan,63.498×108m^3 for Heshan,and 2%for Heshan.2.478×108m^3,6.158×108m^3 more than Fuxin.It is the innovation of this research to use the relative gas emission from mining coal mine as the calibration value of the calculating coefficient of recoverable coalbed methane resources.Its effect needs further study and verification in the future.In a word,this study shows that Heshan coalfield has the pos?sibility of exploring and exploiting coalbed methane.