GAS TESTING SHAKES GROUND–SEISMIC CHECKS AIM TO PINPOINT BEST SPOTS TO DRILL
BURNSIDE TOWNSHIP — Recently, small sections of wooded state land in northern Centre County have been trembling. That shaking might have been unusual, but it wasn’t un expected. It was part of a natural gas company’s effort to pick the best place to drill.
“It’s like taking an MRI of the underground,” said Steven Anest, permit agent with Dawson Geophysical Co. A crew from Dawson’s Midland, Texas, headquarters has been conducting three-dimensional seismic testing on 22 square miles of state game land and forest for North Coast Energy, an Ohio subsidiary of Exco Resources Inc. The re sults are images of the underground as deep as 20,000 feet. That data will help North Coast narrow the field as it decides whether and where to tap into the millions of cubic feet of natural gas floating deep inside the ground. The area is part of the Marcellus Shale region, which stretches from New York to West Virginia. Dawson finished its work Monday, and crews have been collecting the equipment this week. The company’s seismic testing involved its 40-member crew laying 25 receiver lines across the snow-covered property, with what’s known as a geophone about every 10 feet. A pair of large trucks — buggy-mounted vibrator units — would make their way down paths near the receiver lines, stopping to send sound waves into the ground. That’s when the shaking happened. It’s also when the geophones collected the vibrations that were being reflected off the rocks underground. That information was sent through the cable lines to boxes that relayed it to the recorder. That recorder is stationed in a truck, with an observer to make sure everything in the operation runs smoothly. The reports will help North Coast engineers decide if and where to put new drill pads on land to which it holds the gas rights. “It’s a way to look without drilling,” said David Cox, North Coast manager of geosciences. Two wells the company drilled in the Snow Shoe area last year are already producing natural gas. Cox said that gas flows into a nearby Columbia Gas transmission pipeline. While the search continues, the price for natural gas has dropped. According to the U.S. Department of Energy, the spot price average was $9.13 per 1,000 cubic feet in 2008 but was $5.99 per 1,000 cubic feet in December 2008. It is expected to drop to $5.78 per 1,000 cubic feet in 2009. According to the DOE, the economy, together with the growing domestic supply of natural gas, are factors in the drop in demand. “Exco-North Coast continues to map and we continue to permit wells,” Cox said. “The collapse of the natural gas price has certainly changed the picture, and of course we’re keeping an eye on any rules and regulation changes that may come from the (state) and the regulatory process involved in permitting wells in the Marcellus region.”