The Otway Basin is an onshore and offshore basin that extends from the South East of South Australia across the western coast of Victoria to Cape Otway. Rawson Oil and Gas Limited is actively undertaking onshore gas drilling and airborne geophysical survey activities in South East South Australia, primarily in its tenement PEL 155.
Rawson is planning to drill Nangwarry-1 in PEL 155 with the support of the South Australian Government through the Plan for Accelerating Exploration (PACE) gas grant scheme.
Nangwarry-1 will be part of a conventional gas exploration program in the southeast region, with the aim of bringing new gas to the local South Australian market within 18 months to two years.
The well will be drilled to an approximate depth of 4,400 m below ground level and will be located approximately 5 km east of the town of Nangwarry. On-site activities are expected to commence in late 2018 once all regulatory requirements and land access arrangements are completed.
The Nangwarry well will target gas in two horizons: the top Pretty Hill sandstone at approximately 3,100 m and in the Sawpit Sandstone at approximately 4,300 m.
As per its requirement under legislation, Rawson has completed an Environmental Assessment against the existing Statement of Environmental Objectives (SEO) for Drilling Completion and Initial production Testing in the Otway Basin, South Australia to support the drilling of the Nangwarry-1 well.
The targets being drilled are at depth, i.e., more than 3,100 m, compared to shallow groundwater; therefore gas and groundwater are separated by approximately 3,000 m of rock. The Nangwarry-1 well will not be fracture stimulated.
Nangwarry-1 - production gas well (left) and plugged and abandoned gas well (right) schematic within local geology
A commercial discovery at Nangwarry-1 can be developed and delivered to local southeast SA users, including electricity generation, and/or supplied to the wider SA market. It will increase competition in the gas market and support the South Australian Energy Plan objectives by helping to lower energy costs for both industrial and domestic users.
Click here to read the current SEO for Drilling Completion and Initial Production Testing in the Otway Basin, South Australia
Click here for the Nangwarry-1 Fact Sheet
And if you missed our Community Consultation day, click here to download the Posters.
Rawson is also planning to acquire an airborne gravity and magnetic survey over PEL 155 in advance of drilling Nangwarry-1. The purpose of the survey is to confirm the location of key faults and subsurface structures without needing to perform on-ground activities.
The survey is estimated to take a total 13 hours' flying time. It will be acquired using a single engine aircraft flying approximately 150 metres above ground level, deployed from Warrnambool airport.
The survey has been designed to minimise the impact on affected landowners with a short survey duration and limited to between 09:00 and 17:00 in suitable weather conditions.
The survey timing is outside key calving and lambing season and the aircraft will avoid overflying stock yards.
Rawson have completed an Environmental Assessment against the existing Statement of Environmental Objectives (SEO) for airborne preliminary surveys and airborne geophysical operations in South Australia and have the necessary approvals from the Department of State Development who regulate all petroleum exploration activities.
The survey contractor and their aircraft comply with Civil Aviation regulations and are permitted to perform these types of activities.
Click here to read the current SEO for airborne preliminary surveys and airborne geophysical operations in South Australia.
Rawson is committed to keeping the local community informed of its operations in the region. You can contact Michael McGowan at email@example.com or on 0404 087 773 about the Nangwarry-1 well or the airborne survey.
For more information about the petroleum industry regulatory processes please visit the Department of State Development at: http://petroleum.statedevelopment.sa.gov.au/