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.