Subsurface prediction method and system
AssigneeChevron U.S.A. Inc.
InventorsLibo Zhang, Eike F. Rietsch
Life of this patent
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Abstract
A method of predicting subsurface properties of a geologic formation includes acquiring seismic data for a subsurface region including the geologic formation of interest, computing seismic attributes of the measured seismic data over at least part of this geologic formation, determining internally consistent rock properties representative of the geologic formation, generating models of the same part of the geologic formation with these rock properties, computing synthetic seismic data from the models, computing the same attributes from these synthetic seismic data, and using Bayesian analysis to predict, from the probability of modeled attributes given the models, the probability of the actual subsurface properties given the measured attributes.
Claims18
A method of predicting subsurface properties of a geologic formation comprising:
- inputting seismic data for a subsurface region including the geologic formation into a computer comprising one or more processors;
- executing, via the computer, the steps of:
- computing amplitude versus offset seismic attributes from the seismic data;
- physically constraining modeled data representing hypothetical physical properties for at least a portion of the geologic formation;
- computing synthetic seismic data from the physically constrained modeled data;
- computing synthetic amplitude versus offset seismic attributes based on the computed synthetic seismic data;
- and
- applying Bayesian analysis using at least two of the computed synthetic amplitude versus offset seismic attributes, to predict a probability of a particular subsurface property given the measured amplitude versus offset seismic attributes.
A system for predicting subsurface properties of a geologic formation comprising:
- a memory configured to store data including seismic data representing a subsurface region including the geologic formation;
- a processor, configured and arranged to compute amplitude versus offset seismic attributes from the seismic data and to compute synthetic seismic data from modeled data and to compute amplitude versus offset seismic attributes corresponding to the computed synthetic seismic data;
- and
- to predict a probability of a particular subsurface property by applying Bayesian analysis to the computed amplitude versus offset seismic attributes from the seismic data using at least two of the computed amplitude versus offset seismic attributes corresponding to the computed synthetic seismic data.
Dependencies are inferred from the claim text.