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US 9,069,100 B2Granted
Method of modelling a subterranean region of the earth by performing a bayesian inversion
AssigneeStatoil Petroleum AS
InventorsOdd Kolbjørnsen, Ragnar Hauge, Arild Buland
Life of this patent
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Abstract
A method of modelling a subterranean region of the Earth at a first location comprises the steps of: providing geological data; selecting a plurality of facies; providing a distribution of rock physics probability with spatial dependencies; approximating the rock physics probability at the first location with at least one distribution per facies utilizing the spatial dependencies in the rock physics probability distribution; and performing a Bayesian inversion at the first location using the approximation of the rock physics probability distribution. The method may also employ a window comprising the first location and at least one further location.
Claims34
A method of determining a rock facies in a subterranean region of the Earth at a first location, comprising the steps of:
- obtaining seismic data associated with said region;
- selecting a plurality of facies;
- providing a first rock physics probability distribution with spatial dependencies;
- providing a second rock physics probability distribution around the first location comprising at least one probability distribution per facies, wherein the spatial dependencies in the first rock physics probability distribution are utilized, such that the second rock physics distribution provides a simplifying approximation of the first rock physics distribution;
- performing a Bayesian inversion at the first location by a computer processor using the second rock physics probability distribution to predict the probability of the rock facies at said location taking into account said seismic data, in order to indicate a presence of said facies in said region;
- and
- correcting for deviations of the approximating distribution at the first location with a correction term to reproduce the rock physics probability distribution at the first location.
4 more elements
A method of determining a rock facies in a subterranean region of the Earth at a first location comprising the steps of:
- obtaining seismic data associated with said region;
- selecting a plurality of facies;
- providing a first rock physics probability distribution with spatial dependencies;
- providing a second rock physics probability distribution around the first location comprising at least one distribution per combination of facies in a window comprising the first location and at least one further location, whereby the second rock physics distribution provides a simplifying approximation of the first rock physics distribution;
- performing a Bayesian inversion by a computer processor using the second rock physics probability distribution to predict the probability of the rock facies at said first location taking into account the seismic data, in order to indicate a presence of said facies in said region;
- and
- correcting for deviations of the approximating distribution at the first location with a correction term to reproduce the rock physics probability distribution at the first location.
4 more elements
A method of determining a rock facies in a subterranean region of the Earth, comprising the steps of:
- obtaining seismic data associated with said region;
- providing a distribution of rock physics probability;
- selecting a plurality of facies;
- modifying the rock physics probability at a first location by excluding one or more combinations of facies in a window comprising the first location and one or more further locations;
- and
- performing a Bayesian inversion at the first location by a computer processor to predict the probability of the rock facies at said location taking into account the seismic data, in order to indicate a presence of said facies in said region.
3 more elements
A method of determining a rock facies in a subterranean region of the Earth at a first location, comprising the steps of:
- obtaining seismic data associated with said region;
- selecting a plurality of facies;
- providing a first rock physics probability distribution with spatial dependencies;
- obtaining a second rock physics probability distribution comprising at least one probability distribution per facies utilizing the spatial dependencies in the first rock physics probability distribution wherein the second rock physics distribution provides a simplifying approximation of the first rock physics distribution around the first location;
- performing a Bayesian inversion at the first location by a computer processor using the second rock physics probability distribution to predict the probability of the rock facies at said location taking into account said seismic data, in order to indicate a presence of said facies in said region;
- and
- correcting for deviations of the approximating distribution at the first location with a correction term to reproduce the rock physics probability distribution at the first location.
4 more elements
A method of determining a rock facies in a subterranean region of the Earth at a first location comprising the steps of:
- obtaining seismic data associated with said region;
- selecting a plurality of facies;
- providing a first rock physics probability distribution with spatial dependencies;
- obtaining a second rock physics probability distribution comprising at least one distribution per combination of facies in a window comprising the first location and at least one further location, wherein the second rock physics distribution provides a simplifying approximation of the first rock physics distribution around the first location;
- performing a Bayesian inversion by a computer processor using the second rock physics probability distribution to predict the probability of the rock facies at said first location taking into account the seismic data, in order to indicate a presence of said facies in said region;
- and
- correcting for deviations of the approximating distribution at the first location with a correction term to reproduce the rock physics probability distribution at the first location.
4 more elements
A method of determining a rock facies in a subterranean region of the Earth at a first location, comprising the steps of:
- obtaining seismic data associated with said region;
- selecting a plurality of facies;
- providing a first rock physics probability distribution with spatial dependencies;
- approximating the first rock physics probability distribution around the first location with at least one probability distribution per facies utilizing the spatial dependencies in the first rock physics probability distribution, to obtain a simplified, second rock physics distribution;
- performing a Bayesian inversion at the first location by a computer processor using the simplified, second rock physics probability distribution to predict the probability of the rock facies at said location taking into account said seismic data, in order to indicate a presence of said facies in said region;
- and
- correcting for deviations of the approximating distribution at the first location with a correction term to reproduce the rock physics probability distribution at the first location.
4 more elements
A method of determining a rock facies in a subterranean region of the Earth at a first location comprising the steps of:
- obtaining seismic data associated with said region;
- selecting a plurality of facies;
- providing a first rock physics probability distribution with spatial dependencies;
- approximating the first rock physics probability distribution around the first location with at least one distribution per combination of facies in a window comprising the first location and at least one further location, to obtain a simplified, second rock physics distribution;
- performing a Bayesian inversion by a computer processor using the simplified, second rock physics probability distribution to predict the probability of the rock facies at said first location taking into account the seismic data, in order to indicate a presence of said facies in said region;
- and
- correcting for deviations of the approximating distribution at the first location with a correction term to reproduce the rock physics probability distribution at the first location.
4 more elements
Dependencies are inferred from the claim text.