Tortuga Unit Tank Battery. T.G.C. purchased mineral and royalty interests in the Aguila Vado (Eagle Ford) field in Brazos County, Texas. Wells in units associated with these minerals have produced in excess of 850,000 barrels of oil and 1 billion cubic feet of natural gas and are still producing today. Field Rules and well spacing will support additional wells being drilled on proven undeveloped locations that include these mineral interests.