The Domanik formation is one of the major source rocks of the Volga-Urals Basin. It covers an area of over 400,000 square kilometres. Some reports have suggested over a trillion tonnes of buried organic material in the Domanik – potentially leading to around a trillion barrels of oil in place. The Russian government is determined to maintain oil production above 10 million b/d, but the existing resource base is only sufficient for this to occur until 2023. As a result, tight oil is being emphasised as a way to achieve this goal.