부산대학교 도서관

Queensland’s coal seam gas production industry began in 1996 with production from the Permian Baralaba Coal Measures and Bandanna Formation located in the eastern and western Bowen Basin, respectively. It went to another level when production commenced from the Jurassic Walloon Coal Measures in 2005. Production in 2018/2019 amounted to nearly 1500 PJ with nearly 80% coming from the Walloon Coal Measures. The remaining 20% is sourced from the Late Permian Bandanna Formation, Baralaba Coal Measures and Moranbah Coal Measures. A minor volume comes from the Early Permian Cattle Creek Formation. The Early Permian Reids Dome beds are located in the Denison Trough, a graben complex located in the southwest Bowen Basin. The Reids Dome beds were deposited as the basal unit of variably sized grabens and half-grabens. The unit varies in thickness from 9 to >2770 m but the unit hasn’t been fully intersected where it is thickest. Net coal within the formation is also highly variable (<1 to >65 m). At present there has been no commercial production from the coals of the Reids Dome beds, but a number of small fields have reported commercial production from coals of the Early Permian Cattle Creek Formation. By definition, the Cattle Creek Formation was deposited in a marine environment and is contemporaneous with the upper Reids Dome beds. It is here suggested that coals intersected at these producing locations are located in the Reids Dome beds. The interpreted depositional centres for the Reids Dome beds underlie or are immediately adjacent to major Late Permian field developments with access to infrastructure and transmission. Ongoing exploration and appraisal work is continuing across the Denison Trough to fully understand the potential of these coals. Coals from the Reids Dome beds average >10 m3 /tonne, >90% saturation >70% methane and up to 20% ethane.