Rex Energy Corporation is an independent oil, natural gas liquid (NGL) and natural gas company. The Company has operations in the Appalachian Basin and Illinois Basin. In the Appalachian Basin, the Company is focused on its Marcellus Shale, Utica Shale and Upper Devonian (Burkett) Shale drilling and exploration activities. In the Illinois Basin, the Company is focused on its developmental oil drilling and the implementation of enhanced oil recovery (EOR) on its properties. In addition to its drilling and exploration activities, the Company is also engaged in oil and gas field services, where the Company provides water sourcing, water disposal and water transfer solutions for completion operations. The Company operates in two business segments: exploration and production and field services. Its core leasehold consists of interests in developed and undeveloped crude oil, NGL and natural gas resources located in the Appalachian and Illinois basins.