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Multi-crosswell profile 3D imaging and method

Patent ·
OSTI ID:874439
 [1];  [2]
  1. Houston, TX
  2. Seattle, WA
+ Show Author Affiliations

Characterizing the value of a particular property, for example, seismic velocity, of a subsurface region of ground is described. In one aspect, the value of the particular property is represented using at least one continuous analytic function such as a Chebychev polynomial. The seismic data may include data derived from at least one crosswell dataset for the subsurface region of interest and may also include other data. In either instance, data may simultaneously be used from a first crosswell dataset in conjunction with one or more other crosswell datasets and/or with the other data. In another aspect, the value of the property is characterized in three dimensions throughout the region of interest using crosswell and/or other data. In still another aspect, crosswell datasets for highly deviated or horizontal boreholes are inherently useful. The method is performed, in part, by fitting a set of vertically spaced layer boundaries, represented by an analytic function such as a Chebychev polynomial, within and across the region encompassing the boreholes such that a series of layers is defined between the layer boundaries. Initial values of the particular property are then established between the layer boundaries and across the subterranean region using a series of continuous analytic functions. The continuous analytic functions are then adjusted to more closely match the value of the particular property across the subterranean region of ground to determine the value of the particular property for any selected point within the region.

Research Organization:
TomoSeis Inc., Houston, TX (United States)
DOE Contract Number:
FG02-94ER86019
Assignee:
TomoSeis, Inc. (Houston, TX)
Patent Number(s):
US 6388947
OSTI ID:
874439
Country of Publication:
United States
Language:
English

References (8)

Smoothing seismic tomograms with alpha-trimmed means journal January 1988
Traveltime tomography: A comparison of popular methods journal October 1991
Convolutional quelling in seismic tomography journal May 1989
Regularisation of nonlinear inverse problems: imaging the near-surface weathering layer journal February 1990
Tomographic inversion via the conjugate gradient method journal February 1987
3-D seismic reflection tomography on top of the GOCAD depth modeler journal September 1996
Tomographic determination of three‐dimensional seismic velocity structure using well logs, vertical seismic profiles, and surface seismic data journal August 1987
Computerized geophysical tomography journal January 1979

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