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Title: High vertical resolution crosswell seismic imaging

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.

Inventors:
 [1]
  1. (Houston, TX)
Issue Date:
Research Org.:
TomoSeis Inc. (Houston, TX)
OSTI Identifier:
872740
Patent Number(s):
5999489
Application Number:
08/820885
Assignee:
TomoSeis Inc. (Houston, TX) CHO
DOE Contract Number:  
FG02-94ER86019
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
vertical; resolution; crosswell; seismic; imaging; method; producing; images; data; disclosed; accordance; aspect; disclosure; set; vertically; spaced; horizontally; extending; continuous; layers; associated; nodes; defined; region; boreholes; specific; selected; value; particular; characteristic; subterranean; determined; values; established; assigned; positions; node; layer; based; regard; map; produced; therebetween; approximate; model; direct; arrival; traveltime; thereafter; adjusted; reflected; correction; provided; deviation; technique; provides; improvements; ray; tracing; seismic data; continuous layer; vertical resolution; ray tracing; vertically spaced; horizontally extending; seismic imaging; /367/

Citation Formats

Lazaratos, Spyridon K. High vertical resolution crosswell seismic imaging. United States: N. p., 1999. Web.
Lazaratos, Spyridon K. High vertical resolution crosswell seismic imaging. United States.
Lazaratos, Spyridon K. Tue . "High vertical resolution crosswell seismic imaging". United States. https://www.osti.gov/servlets/purl/872740.
@article{osti_872740,
title = {High vertical resolution crosswell seismic imaging},
author = {Lazaratos, Spyridon K.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {12}
}

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