Though it isn't exactly the T. Rex of the oil and gas industry, Rex Energy is taking a bite out of available hydrocarbon assets. The oil and gas exploration and production company has estimated proved reserves of 11 million barrels of oil equivalent, primarily from three regions: the Illinois Basin (in Illinois and Indiana) and the Appalachian Basin (Pennsylvania and West Virginia). The company's Lawrence Field ASP (alkaline-surfactant-polymer) Flood Project utilizes ASP technology, which washes residual oil from reservoir rock, thereby improving the existing waterflow's ability to sweep the residual oil and increasing ultimate oil recoveries. Lawrence Field is in Illinois.