KU News Release
Jan. 5, 2011
Contact: Jason Rush, (785) 864-2178, or Saibal Bhattacharya, (785) 864-2058
Kansas Geological Survey earns grant to test tool for predicting CO2 storage potential
LAWRENCE — The Kansas Geological Survey, based at the University of Kansas, will use a $1.5 million award from the U.S. Department of Energy to test a technique that could cast light on the potential for sequestering carbon dioxide in the deep subsurface of south-central and southwestern Kansas.
The researchers will use a new tool, called volumetric curvature, to analyze data from seismic reflection, a technique commonly used in oil exploration to create images of underground rocks without the necessity of drilling.
CO2 sequestration — the containment of CO2 from industrial processes and other sources — currently is not practiced in Kansas but is being explored worldwide in an effort to reduce the greenhouse gases released into the atmosphere.
One target for sequestration in south-central and southwestern Kansas is a deep saline aquifer called the Arbuckle. The Arbuckle is a porous rock formation more than 3,500 feet deep and up to 1,000 feet thick. It is isolated by numerous impermeable layers, or cap rocks, from the much shallower High Plains aquifer that provides most of the region’s fresh water. Because water in the Arbuckle is unusable, it is a candidate for sequestration.
The Arbuckle must be better defined before CO2 sequestration is considered. Paleokarst — a landscape of ancient caverns and sinkholes formed in limestone and other soluble rocks now buried beneath thousands of feet sediment — sits atop the Arbuckle and could pose problems if its extent is not identified.
“We’ll use the volumetric curvature tool to describe the extent of paleokarst features and associated faults,” said Jason Rush, joint principal investigator on the project with researcher Saibal Bhattacharya.
The tool will be operated from the surface to analyze seismic data collected at the study area. Kansas Geological Survey researchers will then work with industry partners Murfin Drilling Co. and Vess Oil Corp. of Wichita to drill a horizontal borehole in Ellis County into paleokarst features identified by the seismic data analysis.
The borehole will start out vertical, then gradually turn until it reaches a horizontal trajectory in the uppermost Arbuckle. Measurements and images collected from the borehole will be compared to maps generated by the volumetric curvature.
“Along the horizontal length of the well, about 1,500 feet, cores and fluid samples will be recovered and pressure tests recorded to model the way a plume of CO2 would interact with paleokarst,” Bhattacharya said. “This data also will be used to determine the containment or flow of CO2 injected into the subsurface.”
If successful, the seismic data analysis tool would provide a cost-effective way to assess geologic CO2 storage capacity and lead to a better understanding of the underground movement of CO2 in the Arbuckle and other deep saline aquifers.
“This tool will also benefit the oil and gas industry by helping them locate wells in large, undrained reservoir compartments, which increases the odds of getting a productive well,” said Bhattacharya.
“If the Arbuckle saline aquifer proves to be a good candidate for sequestration, the benefits would include the potential for commercial-scale sequestration operations in the state that would reduce CO2 emissions to the atmosphere,” Rush said. “CO2 also can be injected into depleted oil reservoirs to sweep bypassed oil not recoverable by traditional methods, thereby increasing state revenue and reducing oil imports.”
The results of the research will augment other ongoing Kansas Geological Survey studies assessing the potential for CO2 sequestration in central and western Kansas.
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