|Tenement||Area (km²)||Location||Operator||CTP Consolidation Entity||Other JV Participants|
|L 7||469||Amadeus Basin NT||Central||50||50||NZOG
|EP 82 DSA¹||1,489||Amadeus Basin NT||Central||–||100||–||–|
High pressure gas is produced from the Dingo wells and transported via pipeline to the Dingo processing facility at Brewer Estate near Alice Springs. From there, water and hydrocarbon condensates are removed and the pressure is reduced during the conditioning process to meet customer requirements.
Description and Geology
Gas was discovered in 1985 in the Neoproterozoic Arumbera A1 Sandstone during drilling of Dingo 1. Four wells have been drilled on the structure with Dingo 4 being drilled into the water leg. The structure is 11 km by 5.6 km and not completely filled to spill. The productive reservoir is at a depth of approximately 3,000 metres subsurface.
The Dingo Gas Field Development, completed in April 2015, comprised the construction of wellhead facilities, gathering pipelines, compression, a 50 km gas pipeline (Pipeline Licence PL 30) to Brewer Estate in Alice Springs with gas conditioning and custody transfer metering facilities. It was designed to service a gas sale contract with Territory Generation, now Power and Water Corporation.
Appraisal and Development
Additional wells may be required to increase rates and service gas sales contracts.
As part of arrangements in the purchase of Central’s interest in Mereenie Oil and Gas Field, Central (Operator) has a 100% interest in 20 graticular blocks excised from the Joint Venture with Santos in EP 82 surrounding the Dingo Gas Field. This area of 1,492 km², referred to as EP 82DSA (Dingo Satellite Area), contains several leads identified on the existing sparse seismic grid as well as the Orange structure where gas was discovered in the Arumbera A1 Sandstone in Orange 2 in 1984. The proposed Orange 3 well, which is planned to air-drill the Arumbera Formation (drilled with conventional mud-based system and flowed gas to surface in Orange-2 at sub-commercial rates) and the Pioneer and Areyonga formations which flowed gas from the Ooraminna structure to the east, will target 401 PJ of mean prospective resource across these three formations. This Orange 3 target will be drilled as part of a future exploration drilling program.
Due to the proximity to the Dingo Gas Field and associated infrastructure, these satellite prospects are very attractive to Central as they could provide incremental reserves/resources in the event of drilling success. Additional seismic is required to delineate these leads, which are currently estimated to be of a similar size to the Dingo Gas Field.
Below the Arumbera Sandstones is an estimated 69 PJ of mean prospective resource in the Pioneer and Areyonga formations which flowed gas from the Ooraminna structure to the northeast (34.5 PJ net to Central). This Dingo Deep target will be drilled as part of a future exploration drilling program.
Exploration opportunities beneath Dingo Gas Field or in satellite structures as well as at undrilled deeper reservoir levels in the Orange structure have the potential to add significant reserves/resources and value by leveraging off the infrastructure now owned by Central.