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Amadeus Basin

Mosman owns two granted Permits and one application in the Amadeus Basin in Central Australia.

The Amadeus Basin is considered one of the most prospective onshore areas in the Northern Territory of Australia for both conventional and unconventional oil and gas, and hosts the producing Mereenie, Palm Valley and Surprise fields.

It is encouraging to note that the Northern Territory Government is progressing on the development of a gas pipeline and has selected Jemena Northern Gas Pipeline Pty Ltd to construct and operate the North East Gas Interconnector (NEGI) Pipeline.

EP156 Eastern Amadeus

Located in the Northern Territory of Australia, is granted for a term of five years. EP156 currently has no defined Prospects although there are several leads and an area of unconventional hydrocarbon potential. The licence contains three synclines comprising largely of Cambrian-Ordovician age rocks. Ordovician age reservoirs are responsible for the commercial production within the Amadeus Basin.

A report by independent consultants SRK Consulting (Australasia) Pty Ltd (“SRK”) states that, ‘EP156 likely contains significant and strategically located unconventional hydrocarbon potential, associated with the Palaeozoic shales plus additional hydrocarbon potential exists in the form of conventional anticlinal closures in the Neoproterozoic rocks observed from surface outcrop mapping.

A number of prospective leads have been outlined by SRK on EP156.


The permit contains a significant anticline (named West Walker), of over 30km in length. The anticline itself hosts Ordovician through to Neoproterozoic stratigraphy open at various levels. The significance of the geology is its proximity to the nearby Mereenie oil and gas field, which produces from the Ordovician Pacoota Sandstone unit. 

Two wells have been drilled on the anticline, the first West Walker -1 tested the western end of the feature based on a poorly definied seismic grid in 1982, but flowed wet gas to surface at a rate of 3.5MMscf/d from the Pacoota Sandstone, the main producing reservoir in the Mereenie Field. A follow up well drilled, called Tent Hill -1 (1984), located to the southeast on the same anticline (and very poor seismic grid was deemed unsuccessful, although oil was observed weeping from cores.

SRK Consulting (Australia) finalised a report ("SRK Report") into the prospective resources contained in permit EP 145 which is on trend with the existing producing Mereenie oil and gas field.  The report highlights the potential for both conventional oil and gas resources in proven reservoirs within the West Walker Anticline and unconventional gas resources in the Horn Valley Siltstone.

SRK has calculated unrisked prospective resources within both plays which are documented below:

Resource Type                                   P50

Conventional Recoverable Gas (Bcf)                12.44

Unconventional Recoverable Gas (Bcf)             1456

Table 1: Unrisked REsources (Source: SRK Report)

EP(A)155 Mount Winter

Located 135 km from EP156, within the prime Horn Valley Siltstone fairway between the Mereenie and Surprise Oil Fields, EP(A)155 contains the historical wells Mount Winter 1 and 1A that reported oil shows1. Seismic and well data comprise limited 2D seismic lines and two wells, one with oil shows. These oils shows were recorded within two formations:

  • The first trap with oil shows was in the Stairway Sandstone. The Stairway is the production layer (reservoir) at Surprise 1REH1. These tight conventional formations with good porosity but low permeability can flow-to-surface with new technology, and in particular multi-staged stimulation and horizontal drilling; and

  • A second trap was discovered in the Bitter Springs Formation determined to be of the Johnny Creek Beds petroleum bearing unit.  Oil shows here again were not flowed to surface as the technology to do so did not exist. There are also deeper formations which were not tested such as the Pacoota and deeper plays.

EP(A)155 is an exploration permit application; as such it is subject to successful land access negotiation with the Traditional Owners prior to the grant of the permit.

Proposed Gas Pipeline

The Northern Territory Government is progressing on the development of a gas pipeline and has recently selected a construction partner and an operations partner for the Northern Gas Pipeline to connect NT to eastern states gas markets.

Further information is available on the attached link.

Sub Salt Play

The following is a presentation made at the 2016 AGES Conference see attached link.