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STATEMENT OF PROBLEM The substantial promise of crosswell tomographic imaging for enhanced oil recovery (EOR) monitoring is compromised by restricted crosswell range, Crosswell Range complex well-preparation logistics, and high data acquisition costs. Fermat's Realizable crosswell range is largely determined by the strength of principal can be applied to data from a pair of walk-away vertical seismic downhole sources. Numerous technologies have been developed to produce profiles (VSPs), to extract direct-arrival crosswell traveltime information seismic energy from downhole sources, including: air guns, sparkers, between the two wells. This information can be used to determine a number explosives, imploders, magnetostrictives, piezoelectrics, and vibrators. of properties of the interwell medium, including velocity. Twin-VSP Despite the variety of source technologies employed to acquire crosswell data, simulation (TVSC) of crosswell data can substantially increase the distance reliable interwell ranges are limited to a few hundreds of feet. This is due to a between the wells while simplifying well-preparation logistics and decreasing combination of intrinsic limitations that affect the effective power of the data acquisition costs, thereby improving the economics and extending the downhole sources. Using conventional wirelines, only about 1OKW of power applicability of crosswell monitoring of EOR processes.
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