Douglas Arthur Schwebel

Great Artesian Oil & Gas Ltd. engages in the exploration of petroleum. The company is headquartered in West Perth, Australia.

Tap Oil Ltd. is an independent oil and gas exploration and production company. The company engages in the acquisition and development of oil and natural gas reserves in Australia and Thailand. It operates through three segments: Oil & Gas Production and Development, Oil & Gas Exploration, and Third Party Gas. The Oil & Gas Production and Development segment includes the assets moved from the exploration phase to the development phase and also includes producing assets. The Oil & Gas Exploration segment includes all the areas of interest still in their exploration phase. The Third Party Gas segment includes the purchases and sale of gas. The company was founded by Edward Patrick Jacobson on March 14, 1995 and is headquartered in Perth, Australia.

Roc Oil Co. Pty Ltd. is an upstream oil and gas company, which engages in exploration of oil and natural gas. It operates across the range of upstream business activities from exploration and appraisal to development and production delivery. The company was founded by Robert John Patrick Doran in 1997 and is headquartered in Sydney, Australia.

Part of Usaha Tegas Sdn. Bhd., Pexco NV is an Indonesian company that provides oil and gas exploration services.

Part of Pexco NV, Benaris International Pty Ltd. is an Australian company that provides oil and gas exploration services. The private company is based in South Yarra, Australia.