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High vertical resolution crosswell seismic imaging

United States Patent

5,999,489
December 7, 1999
View the Complete Patent at the US Patent & Trademark Office
A method for producing high vertical resolution seismic images from crosswell data is disclosed. In accordance with one aspect of the disclosure, a set of vertically spaced, generally horizontally extending continuous layers and associated nodes are defined within a region between two boreholes. The specific number of nodes is selected such that the value of a particular characteristic of the subterranean region at each of the nodes is one which can be determined from the seismic data. Once values are established at the nodes, values of the particular characteristic are assigned to positions between the node points of each layer based on the values at node within that layer and without regard to the values at node points within any other layer. A seismic map is produced using the node values and the assigned values therebetween. In accordance with another aspect of the disclosure, an approximate model of the region is established using direct arrival traveltime data. Thereafter, the approximate model is adjusted using reflected arrival data. In accordance with still another aspect of the disclosure, correction is provided for well deviation. An associated technique which provides improvements in ray tracing is also disclosed.
Lazaratos; Spyridon K. (Houston, TX)
TomoSeis Inc. (Houston, TX)
08/ 820,885
March 21, 1997
This invention was made with Government support under STTR Grant No. DE-FG02-943486019 awarded by the Department of Energy. The Government has certain rights in this invention.