Local residents, infrastructure, and oil and gas pipelines could be at risk from the ground heaving and sinking in West Texas after years of fossil fuel production, according to a new study from Southern Methodist University (SMU) scientists. In an SMU statement, research scientist Jin-Woo Kim said, “This region of Texas has been punctured like a pin cushion with oil wells and injection wells since the 1940s and our findings associate that activity with ground movement.”
Two large sinkholes around Wink, Texas, may just be the start, according to Kim and SMU professor and geophysicist Zhong Lu. Scientific Reports published their research online earlier this month: Kim and Lu drew on radar satellite images revealing significant ground movement in an area of 4,000 square miles. One spot saw movement of up to 40 inches in two and a half years. Lu said the ground movement isn’t normal.
Imagery and oil well production data from the Railroad Commission of Texas helped the researchers connect the ground movement to oil activity. Pressurized fluid injection into what SMU described as “geologically unstable rock formations” in the area is one of those activities; the scientists discovered ground movement corresponded with “nearby sequences of wastewater injection rates and volume and CO2 injection in nearby wells.”
And, outside the 4,000 square mile area, more dangers may lurk. Kim said, “We’re fairly certain that when we look further, and we are, that we’ll find there’s ground movement even beyond that.” SMU said the region is vulnerable to human endeavors because of its geology, including shale formations and water-soluble salt and limestone formations.
Lu said, “These hazards represent a danger to residents, roads, railroads, levees, dams, and oil and gas pipelines, as well as potential pollution of ground water. Proactive, continuous detailed monitoring from space is critical to secure the safety of people and property.”