Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1997-03-21
1999-12-07
Oda, Christine K.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 58, 367 59, 367 50, 367 73, G01V 140
Patent
active
059994894
ABSTRACT:
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.
REFERENCES:
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patent: 5742560 (1998-04-01), Krebs
Jerry M.Harris (Lattice parameterization for tomography) 1992).
Lazaratos et al (Crossingwell seismic imaging of reservoir changes caused by CO2 injection).
Spyridon K. Lazaratos and Bruce P. Marion; "Crosswell seismic imaging of reservoir changes by CO.sub.2 injection"; Nov. 1996; Expanded abstracts of annual international meeting of the society of exploration geophysicists.
Jerry M. Harris; "Lattice Parameterization for Tomography"; May 1993; Annual report of seismic tomography project, department of geophysics, Stanford University.
Jerry M. Harris; "An approach to adaptive gridding for traveltime tomography"; Jun. 1994; Annual report of seismic tomography project, department of geophysics, Stanford University.
Jolly Anthony
Oda Christine K.
Pritzau Mike
Shear Steve
TomoSeis Inc.
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