Determination of fluid properties of earth formations using stochastic inversion
First Claim
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1. A method for determining a parameter of interest of a fluid in a subsurface region of earth formations comprising:
- (a) obtaining seismic survey information about the subsurface region;
(b) identifying at least one seismic horizon of interest from the obtained survey information;
(c) measuring at least one seismic attribute for the at least one horizon of interest at a plurality of locations, and obtaining a first probability density function (PDF) thereof;
(d) defining a plurality of realizations of a model including at least one rock property in the region of interest;
(e) defining at least one trial value of at least one property of said fluid and obtaining from said at least one trail value and said plurality of realizations of said model a second PDF associated with said at least one seismic attribute and said fluid property; and
(f) determining from the first and second probability density functions said parameter of interest.
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Abstract
A method of determining a fluid property in a subsurface region of interest of an earth formation uses measurements of seismic attributes on seismic data. For a test region, a plurality of realizations of rock properties are specified, and for each of the realizations and a selected value of a fluid property, the seismic attribute is modeled. This defines a probability density function (PDF). Comparison of the PDF of the model output with the PDF on the measured seismic data is used to determine the likelihood of the selected fluid property.
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Citations
27 Claims
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1. A method for determining a parameter of interest of a fluid in a subsurface region of earth formations comprising:
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(a) obtaining seismic survey information about the subsurface region;
(b) identifying at least one seismic horizon of interest from the obtained survey information;
(c) measuring at least one seismic attribute for the at least one horizon of interest at a plurality of locations, and obtaining a first probability density function (PDF) thereof;
(d) defining a plurality of realizations of a model including at least one rock property in the region of interest;
(e) defining at least one trial value of at least one property of said fluid and obtaining from said at least one trail value and said plurality of realizations of said model a second PDF associated with said at least one seismic attribute and said fluid property; and
(f) determining from the first and second probability density functions said parameter of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification