casino trough

Casino Trough
Coal seam methane
Exploration for coal seam methane in the Clarence-Moreton Basin has grown since the first well was drilled in 1997. The limited available data on the Nymboida and Ipswich equivalent Coal Measures indicate that they probably meet most of the requirements for the production of coal seam methane. The depth of cover is excessive in the deeper parts of the basin; however, this is not always a problem. There is ample evidence of gas within the Nymboida Coal Measures, particularly in the shallower coal mining area in the south-west of the basin.

The Casino area of the Clarence-Moreton Basin has been found to be prospective for both conventional and coal seam gas. Metgasco has proposed development of the gas powered Richmond Valley Power Station which will be fed by coal seam gas extracted from the Walloon Coal Measures and conventional gas extracted from deeper reservoirs.
http://www.ga.gov.au/energy/province-sedimentary-basin-geology/petroleum/offshore-eastern-australia/clarence-moreton.htmlReservoirs
The Ripley Road Sandstone, in the lower Bundamba Group, is the most widespread and most quartzose sandstone dominated unit within the basin. It has only been tested by one successful drill stem test (DST) which recovered 46 m of gas cut mud with a trace of oil. Reservoir data is limited; however, porosities of 3% to 29% and permeabilities of 0.21 to 57md have been recorded, and log-derived porosities generally range from 15% to 25%.

The Heifer Creek Member, in the middle of the Koukandowie Formation, has the best reservoir properties of any unit in the Clarence-Moreton Basin. Porosities of 7.8% to 20.5% and permeabilities of 0.13 to 69md have been measured. Core analyses and DST results indicate that the Heifer Creek Member typically has fair to good porosity but with generally low permeability. The best gas flow in the unit was 500 000 cf/d (14 000 cubic metres per day) and other DST data suggests if hydrocarbons were encountered they would flow at substantial rates. 0.5% of the pore volume of one sidewall core, in a unit with 24% porosity and 26md of permeability, contained oil with a strong yellow cut.

The Nymboida Coal Measures, Raceview Formation, Gatton Sandstone (in the middle Bundamba Group) and the Walloon Coal Measures are also considered potential reservoirs if areas of favourable facies or structural porosity/permeability can be recognised.
http://www.resourcesandenergy.nsw.gov.au/miners-and-explorers/geoscience-information/overview/regional/sedimentary-basins/clarencebasin

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