EP 115 is operated by Central. Located within the Amadeus Basin, this large block stretches approximately 210 km to 450 km west of Alice Springs and encompasses the Surprise Oil Field production licence.
|Location||Operator||CTP Consolidation Entity||Other JV Participants|
|EP 115||11,435||Amadeus Basin NT||Central||100||100||–||–|
Description and Geology
The northern margin of the Amadeus Basin forms a broad northward dipping monocline, terminated at the northern margin by south verging thrust faults. Multiple northwest plunging anticlinal trends lie within the permit, hydrocarbons may be trapped in structural culminations formed by faults, dip reversal, or the presence of salt movement such as that underlying Surprise Oil Field. Stratigraphic traps may also be present however, more detailed seismic and fieldwork will be needed to delineate the leads. The proven Larapintine petroleum system comprises reservoirs of the Pacoota Sandstone and the Stairway Sandstone sealed by the Stokes Siltstone, and charged by hydrocarbons generated and expelled from the Horn Valley Siltstone (HVS). The HVS is oil mature to the west, and progressively turns to gas mature to the east in the permit. Underlying these are Cambrian and Neoproterozoic rocks with reservoir potential demonstrated at the Dingo Gas Field in the eastern Amadeus, where the Arumbera Sandstone is productive. Other untested formations such as the Pioneer and Areyonga that flowed gas at the Ooraminna or the Heavitree/fractured basement which has flowed gas at Magee 1 and Mt Kitty 1.
Conventional exploration opportunities in this block comprise:
- four-way dip and fault bounded structural culminations to the north of the permit;
- sub-thrust traps formed where known reservoirs are juxtaposed against sealing lithologies;
- the potential for an unconventional “continuous resource” play is recognised in the Horn Valley Siltstone (HVS), source of oil and gas in Mereenie and Palm Valley fields. The HVS developed on the flanks either side of the anticlinal trend are prospective unconventional reservoir targets; and
- large basement closure poorly defined by gravity and limited seismic may be analogous to the Dukas structure in the southern Amadeus.
Central acquired gravity data in 2014 which has been integrated with magnetics, seismic data and outcrop geology to define additional traps in this vast and underexplored area. Additional seismic will be required to delineate several leads and future wells will test the proven Stairway Sandstone and the Pacoota Sandstone, as well as deeper targets (Heavitree/fractured basement). The wells may also collect core, desorption and other laboratory data which will further develop the company’s knowledge of the HVS continuous resource, shale oil or shale gas targets.
The Mamlambo 1 exploration well is planned to test the Stairway Sandstone and the Pacoota Sandstone within L6 (Surprise Production Licence). Information from this well will inform on future seismic acquisition and drilling targets within EP115.
The Zevon sub-salt lead has been defined as a very large closure (circa 1,600 km²) from seismic and gravity studies and is located between the Mereenie Oil & Gas Field and the Surprise Oil Field.
A 30km seismic survey is planned for Q4 CY2021 to acquire data, which can be used to optimise the acquisition parameters for a subsequently larger seismic program.