Australia's Norwest Energy Updates on Operations at its Upstream Assets

Australia's Norwest Energy NL provided Monday an update on the company's local and foreign operations.

Australian Exploration Program

EP368 and EP426 (Onshore Perth Basin, Western Australia)

The operator of EP368, Empire Oil and Gas NL, has advised Norwest that following the successful completion of the “Black Swan” airborne geophysical survey that it has identified an exciting, high impact, near term drilling prospect named Lockyer Deep.

Lockyer Deep is a medium risk well, targeting between 25 and 134 billion cubic feet (Bcf), with a best case estimate of 58 Bcf. This prospect will be targeting the Kingia reservoir fairway which has been identified following the recent drilling success by AWE at Senecio-3, Waitsia-1 and 2 and Irwin-1, all located in acreage immediately west of EP368. A new and significant gas play in the Kingia Sandstone has been confirmed in the northern part of the Perth Basin which will be further tested to the east of the play with the drilling of Lockyer Deep.

The extent of the play into EP368 remains to be confirmed but the results of the recent AWE Irwin-1 well suggests that the Kingia reservoir fairway increases in thickness to the east and thus potentially into EP368.

Lockyer Deep will also be used to appraise an attractive secondary oil target from the previously discovered oil in both the Lockyer-1 and North Erregulla-1 historic wells where oil was encountered in the Dongara/Wagina sandstone in tight reservoir. The deep gas potential of the Kingia Sandstone was not reached by these wells and as such remains untested.

The reprocessing of more than 249 miles (400 kilometers) of historic 2D seismic data in the vicinity of Lockyer 1 and North Erregulla 1 is nearing completion, with encouraging results which can be expected to greatly reduce structural risk. The improvement in data quality is substantial and offers the potential of providing a significant improvement in the definition of the subsurface structure, and improving confidence in selecting future drilling locations.

The operator has a contingent rig slot secured for the drilling of Lockyer Deep in mid 2016 subject to funding and government approvals.

Should Lockyer Deep be successful, there is immediate follow up potential at the North Erregulla prospect, located to the south west of Lockyer Deep.


  • Empire Oil Company (WA) Limited (Operator) - 77.78 percent
  • Westranch Holdings Pty Ltd. (Norwest Energy NL) - 22.22 percent


  • Empire Oil Company (WA) Limited (Operator) - 80.00 percent
  • Westranch Holdings Pty Ltd. (Norwest Energy NL) - 20.00 percrnt

EP413 – Northern Perth Basin Shale Gas Exploration (Norwest 27.945 percent, Operator)

During 2Q CY2015, Norwest successfully completed the EP413 Arrowsmith 3D seismic acquisition survey on behalf of the EP413 Joint Venture. The survey was designed to assess the extent of the resource surrounding Arrowsmith-2, and to assist in defining the optimal location and target formation for Norwest’s first horizontal well, Arrowsmith-3.

The 3D dataset obtained from the acquisition program is currently being processed in the United States. Preliminary results indicate a substantial improvement in structural definition. Ongoing processing, which includes pre-stack depth migration and fracture analysis, is expected to be finalized during October. Following receipt of the final dataset, a detailed in-house interpretation will be conducted which will allow the planning for Arrowsmith-3 to continue.

Arrowsmith-3 Planning

Preliminary planning with the co-venturers has commenced for Arrowsmith-3, planned for the 2015/16 permit year, with timing dependent upon equipment availability and the regulatory approvals process.
The final decision on surface location, target formation and lateral extent will be made once the 3D seismic survey processing and interpretation cycle is complete, as a clear understanding of the subsurface geology is essential to this process.

EP413 Joint Venture

  • Norwest Energy NL - 27.945 percent (Operator)
  • AWE Limited - 44.252 percent
  • Bharat PetroResources Ltd 27.803 percent

TP/15 (Norwest 100 percent)

Norwest continues to progress discussions with Rey Resources to agree on the terms and conditions under which Rey may earn an interest in TP/15.

As detailed in the ASX Announcement dated Oct. 29, 2014, TP/15 contains a number of conventional oil plays, with primary prospect Xanadu having an un-risked prospective recoverable resource of 160 millob barrels (best estimate).

The Xanadu Prospect

Structurally, the Xanadu Prospect is a prominent horst block lying parallel to the coastline in very shallow water. Xanadu-1 will target Permian sands from a depth of approximately 2,625 feet (800 meters). Near-shore sands of the Dongara Sandstone represent the primary target, with secondary targets in the fluvio-deltaic Irwin River Coal Measures and the regressive marine sands of the High Cliff Sandstone.

Retrieval and mapping of additional 2D marine seismic data has provided a comprehensive regional interpretation of the structural setting and charge history for the Xanadu oil prospect.

The structural mapping, which is based on good quality 2D seismic data, as well as high resolution gravity data resulting from a 2009 airborne 3D Full Tensor Gradiometry Survey, indicates the Xanadu Prospect is geologically similar to both the Cliff Head and Hovea structures. On the basis of reliable seismic correlations, the stratigraphic section at Xanadu is expected to be very similar to that encountered at Vindara 1, 4.3 miles (7 kilometers) to the north-northwest.

In estimating potential Xanadu hydrocarbon volumes, the reservoir parameter values observed in Vindara 1 have been the primary reference. Vindara 1, testing a rotated fault block, had only minor hydrocarbon shows. The failure of this well, and similar structural tests further north, is considered to be due to insufficient charge and/or breach of seal resulting from fault re-activation.

The Xanadu structure is considered to be more favorably located for hydrocarbon charge. Additionally, leakage on fault planes is considered less likely because of the interlocking nature of the fault network which gives rise to the Xanadu horst.

In estimating the recoverable oil volumes summarised in Table 1 below, a 50 percent recovery factor has been assumed.

Table 1

Un-risked Prospective Resource: recoverable volumes oil (MMstb or million stank barrels)

  • Reservoir
    • Dongara Sandstone: Low estimate - 3; Best estimate - 12; High estimate - 22
    • Irwin River Coal Measures: Low estimate - 13; Best estimate - 88; High estimate - 159
    • High Cliff Standstone:  Low estimate - 29; Best estimate - 60; High estimate - 256
    • Total: Low estimate - 45; Best estimate - 160; High estimate 437

The timing of drilling Xanadu-1 is dependent upon a range of factors including government approvals process, rig availability and securing a farminee.

EP 492 (Norwest 100 percent)

EP492 covers 332 square miles (860 square kilometers), along the northern Perth Basin coastal region between Green Head and Lancelin.

Data retrieval and interpretation of structural and depositional history of EP492 has been undertaken to assist with the evaluation of hydrocarbon prospectivity. EP492 has a six year term, with year one of the work program requiring geological studies to be followed in year two with a 2D seismic survey.

SPA-16 AO (Norwest 100 percent)

SPA-16 AO (SPA) is located at the southern end of the northern Perth Basin and adjoins EP447 that contains the Walyering gas/condensate field. The SPA also adjoins EP432 that contains the Cooljarloo and Woolka oil prospects and the Cataby-1 oil discovery.

Data retrieval and preliminary seismic interpretation of historic data has been undertaken on the permit to further assist with the evaluation of hydrocarbon prospectivity.

Norwest has applied to the Department of Mines and Petroleum to convert the SPA to an Exploration Permit and has submitted a proposed six year minimum work program for consideration.

United Kingdom Exploration Program

P2265 (Blocks 98/7b, 98/8a and 98/12a) – Offshore Wessex Basin (Norwest 65 percent)

Permit P2265 lies to the east of the producing Wytch Farm oil field in Bournemouth Bay in southern England and includes conventional oil targets, with the ability for nearshore targets to be drilled from onshore.

Reprocessing of the historical 3D seismic data is currently being carried out in the United States. Time processing has been completed and depth processing is continuing. It is anticipated that this reprocessing will be finalized before the end of 4Q CY2015.

Immediately to the west of P2265 and straddling this permit is the Colter Prospect (operated by InfraStrata plc) which is estimated to have 50 million barrels oil in place. The reprocessing of the historical 3D seismic data will further assist in determining how far this prospect extends into P2265.

Norwest and HALO have two years to reprocess the historical 3D seismic data, select a drillable target and find a suitable farm-in partner. At the end of this two year period, a commitment must be given to drill a well in the subsequent two years or relinquish the License.

P2265 Joint Venture

  • NWE Mirrabooka (UK) Pty Ltd. - 65 percent
  • Hague and London Oil (HALO) - 35 percent (Administrator)

Corporate Activities

Perth Basin Oil and Gas Expo

Norwest is assisting in the organisation and will participate in the upcoming Shire of Irwin Oil and Gas Expo (Expo). The purpose of the Expo is to bring together community and stakeholders to communicate and share information in relation to local oil and gas mining activities.

AAPG Conference

Norwest is presenting a number of presentations at this weeks AAPG International Conference and Exhibition and will be discussing the unconventional prospectivity of the northern Perth Basin in addition to providing an overview of the company’s project portfolio.

CSIRO Perth Basin Research Program

Norwest is a founding member of a syndicate of companies working closely with CSIRO to undertake a baseline monitoring program in the onshore Perth Basin. The program is designed to establish environmental baselines associated with tight gas development and to effectively target monitoring of any potential impacts of such development.

Petroleum Tenements – Interests

  • Permit
    • Northern Perth Basin
      • EP368 (Onshore): 232 square miles (600.3 square kilometers); Norwest - 20 percent
      • EP426 (Onshore): 911 square miles (2,360 square kilometers); Norwest - 22.2 percent
      • EP413 (Onshore): 196 square miles (508.3 square kilometers); Norwest - 27.945 percent
      • L14 (Onshore): 15 square miles (39.8 square kilometers); Norwest - 6.278 percent
      • TP/15 (Offshore): 249 square miles (645.8 square kilometers); Norwest - 100 percent
      • EP492 (Onshore): 332 square miles (860 square kilometers); Norwest - 100 percent
      • SPA-016 AO (Onshore): 311 square miles (805 square kilometers); Norwest - 100 percent
      • Total Area Net to Norwest: 766,261.4 acres (3,100.1 square kilometers)
    • Timor Sea
      • AC/6 (Royalty) in Vulcan Sub-Basin, NT (Offshore): 97 square miles (252.1 square kilometers); Norwest - 1.25 percent ORRI
    • United Kingdom
      • P2265 in Wessex Basin (Offshore): 62 square miles (160 square kilometers); Norwest - 65 percent


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