Title:
JOINT INVERSION WITH UNKNOWN LITHOLOGY
Document Type and Number:
WIPO Patent Application WO/2012/166228
Kind Code:
A8
Abstract:
Method for joint inversion of geophysical data to obtain 3-D models of geological parameters for subsurface regions of unknown lithology. Two or more data sets of independent geophysical data types are obtained, e.g. seismic and electromagnetic. Then they are jointly inverted, using structural coupling, to infer geophysical parameter volumes, e.g. acoustic velocity and resistivity. Regions of common lithology are next identified based on similar combinations of geophysical parameters. Then a joint inversion of the multiple data types is performed in which rock physics relations vary spatially in accordance with the now-known lithology, and 3-D models of geological properties such as shale content and fracture density are inferred. The computational grid for the last inversion may be defined by the lithology regions, resulting in average geological properties over such regions, which may then be perturbed to determine uncertainty in lithologic boundaries.
Inventors:
SCHMEDES JAN (US)
DICAPRIO CHRISTOPHER (US)
JING CHARLIE (US)
LEAHY GARRETT M (US)
MULLUR ANOOP A (US)
SALTZER REBECCA L (US)
DICAPRIO CHRISTOPHER (US)
JING CHARLIE (US)
LEAHY GARRETT M (US)
MULLUR ANOOP A (US)
SALTZER REBECCA L (US)
Application Number:
PCT/US2012/028541
Publication Date:
February 28, 2013
Filing Date:
March 09, 2012
Export Citation:
Assignee:
EXXONMOBIL UPSTREAM RES CO (US)
SCHMEDES JAN (US)
DICAPRIO CHRISTOPHER (US)
JING CHARLIE (US)
LEAHY GARRETT M (US)
MULLUR ANOOP A (US)
SALTZER REBECCA L (US)
SCHMEDES JAN (US)
DICAPRIO CHRISTOPHER (US)
JING CHARLIE (US)
LEAHY GARRETT M (US)
MULLUR ANOOP A (US)
SALTZER REBECCA L (US)
International Classes:
G06G7/48
Attorney, Agent or Firm:
PLUMMER., J., Paul et al. (CORP-URC-SW359P.O. Box 218, Houston TX 2189, US)
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