Oasis Petroleum Inc., an independent exploration and production company, focuses on the acquisition and development of unconventional oil and natural gas resources in the North Dakota and Montana regions of the Williston Basin. As of December 31, 2016, the company had 517,801 net leasehold acres in the Williston Basin; and approximately 305.1 million barrels of oil equivalent of estimated net proved reserves. It also operates midstream services and a well services businesses. The company sells its oil and natural gas to refiners, marketers, and other purchasers that have access to pipeline and rail facilities. Oasis Petroleum Inc. was founded in 2007 and is headquartered in Houston, Texas.