Southwest Branch Co., an operating subsidiary of the Chinese energy and petrochemical firm Sinopec, selected GXT for a comprehensive interpretive imaging program at the largest gas field in western Sichuan Province, China. The contract directs GXT to identify high-potential, drillable prospects based on seismic data that were previously acquired using I/O's VectorSeis® digital full-wave sensors.
"This is an excellent example of our full-wave solution strategy coming to life,” said Bob Peebler, I/O’s president and CEO. “We were involved in this project from the beginning, helping to design the survey and to select the technologies that would be needed to properly image the numerous fractured gas reservoirs in the area. The data was acquired using I/O's System Four(TM) outfitted with VectorSeis. At times during the survey, the contractor had nearly 20,000 live seismic channels in operation. This provided the sampling density needed to properly illuminate the reservoir. There is tremendous excitement throughout our company about what insights we will be able to provide to our client using this high-density, full-wave data set."
GXT was awarded the processing contract in a competitive tender against other seismic imaging companies. A full suite of processing steps will be applied to resolve subtle properties within the reservoir zones, including mapping fracture density which is believed to correlate with well productivity. In addition to applying its advanced noise attenuation algorithms to extract broadband, high-resolution P-wave data, GXT will image the converted (shear) waves, map sub-surface anisotropy using AZIM(TM), and analyze shear wave splitting in the reservoirs to determine fracture orientation and intensity.
"We are convinced of the benefits of full-wave imaging in this area,” said Xu Xiangrong, Southwest Branch’s president. “Several years ago, we conducted a pilot test which showed multicomponent seismic data would be useful in characterizing fractured gas reservoirs in Sichuan. This gave us the confidence to undertake a full-scale acquisition program. The raw data looks promising. GX Technology demonstrated that they had the necessary capabilities to deliver against the imaging objectives we had set. In order to meet its increasing energy needs, China is committed to deploying state-of- the-art technology. The I/O family of companies has the type of cutting-edge toolkit, the experienced personnel, and the collaborative approach we require. I look forward to our ongoing cooperation on this imaging program and on other opportunities that may emerge in the future."
As part of this project, GXT has also been requested to undertake advanced geophysical and reservoir analyses that build upon the acquired seismic data, such as determining reservoir porosity and permeability, evaluating gas saturation, and mapping sedimentary facies and sequence stratigraphy. The integrated seismic data sets will ultimately be used to select new well locations and to identify other exploitable targets throughout the basin. Initial imaging work will begin immediately, with final results of this processing and reservoir characterization project expected to be delivered in the first half of 2007.
GXT is a Houston- based company that operates regional imaging centers in Denver, London, Calgary, Aberdeen, Caracas, Port-of-Spain, Luanda, and Port Harcourt. Parent company I/O provides seismic acquisition equipment, software, and planning and seismic processing services to the global oil and gas industry. I/O's technologies are applied in both land and marine environments, in traditional 2D and 3D surveys, and in rapidly growing areas like time-lapse (4D) reservoir monitoring and full-wave imaging. Based in Houston, I/O has regional offices in Canada, Latin America, Europe, China, Russia, Africa, and the Middle East.
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