Longwall coal mines in the Bowen Basin of Australia are highly productive and gassy, comprising many coal seams above the working seam. Predictive modelling of specific gas emission (SGE) using the conventional Winter model developed in Germany or other European based models often results in significant discrepancies from reality. To improve methane emission prediction and management, significant efforts on measuring gas release from different coal seams were made at three longwall mines by safely drilling core holes into the goaf. The vertical extent of the gas emission zone and the proportion of gas released from different coal seams were quantified. It was found that the Winter model significantly underestimates gas emissions for coal seams 75–150 m above the mining seam. This discrepancy is likely due to the intensive goaf drainage using large-diameter vertical wells in the high production Bowen Basin longwall mines. The Winter model also appears inadequate in estimating the height of the gas emission zone at different mines where the extraction thickness differs. Finally, a new empirical model for predicting the degree of gas emission from roof coal seams is developed for Bowen Basin mines and other mines with similar mining conditions. The measured post-mining gas content data and the newly developed model in this paper can provide guidance to the design of goaf drainage boreholes and capacity, as well as assessing coal mine methane and abandoned mine methane resources.

澳大利亚鲍文盆地的长壁煤矿产量高，瓦斯多，包括工作层上方的许多煤层。使用在德国开发的传统冬季模型或其他基于欧洲的模型对特定气体排放 (SGE) 进行预测建模通常会导致与现实的显着差异。为了改进甲烷排放预测和管理，通过在采空区安全地钻取岩心孔，在三个长壁煤矿测量不同煤层的瓦斯释放量方面做出了重大努力。量化了瓦斯释放区的垂直范围和不同煤层释放瓦斯的比例。结果发现，Winter 模型显着低估了矿层以上 75-150 m 煤层的瓦斯排放量。这种差异可能是由于在高产量的 Bowen Basin 长壁矿中使用大直径垂直井进行密集采空区排水。Winter 模型在估计不同开采厚度不同矿山的瓦斯排放区高度方面也显得不足。最后，针对博文盆地煤矿和其他具有类似开采条件的煤矿，建立了预测顶板煤层瓦斯排放程度的新经验模型。本文测得的采后瓦斯含量数据和新开发的模型可为采空区排水钻孔和容量的设计以及煤矿瓦斯和废弃煤矿瓦斯资源的评估提供指导。Winter 模型在估计不同开采厚度不同矿山的瓦斯排放区高度方面也显得不足。最后，针对博文盆地煤矿和其他具有类似开采条件的煤矿，建立了预测顶板煤层瓦斯排放程度的新经验模型。本文测得的采后瓦斯含量数据和新开发的模型可为采空区排水钻孔和容量的设计以及煤矿瓦斯和废弃煤矿瓦斯资源的评估提供指导。Winter 模型在估计不同开采厚度不同矿山的瓦斯排放区高度方面也显得不足。最后，针对博文盆地煤矿和其他具有类似开采条件的煤矿，建立了预测顶板煤层瓦斯排放程度的新经验模型。本文测得的采后瓦斯含量数据和新开发的模型可为采空区排水钻孔和容量的设计以及煤矿瓦斯和废弃煤矿瓦斯资源的评估提供指导。