System and method for declustering well log samples
AssigneeChevron U.S.A. Inc.
InventorsAndrew W. Harding, Michael W. Waite, Michael J. Pyrcz
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Abstract
Wellbore data samples related to a subsurface volume of interest are weighted based on wellbore orientation and/or stratal orientation. Declustering weights are determined that account for differences in sampling density caused by wellbore and/or stratal structure orientation. The declustering weights may be implemented to weight samples of parameters taken within wellbores, and/or to update or adjust other weights determined according to other schemes.
Claims17
A method of declustering samples of a property within a subsurface volume of interest, the method comprising:
- obtaining samples of a property within a subsurface volume of interest, the samples having been acquired from one or more wellbores formed within the subsurface volume of interest;
- and
- determining weights corresponding to the individual samples, using a computer, such that a weight of an individual sample is a function of the orientation of a wellbore from which the individual sample was acquired, wherein the weight of the individual sample is a function of the cosine of the angle between the wellbore from which the individual sample was acquired and the vertical.
A system configured to decluster samples of a property within a subsurface volume of interest, the system comprising:
- electronic storage storing samples of a property within a subsurface volume of interest, the samples having been acquired from one or more wellbores formed within the subsurface volume of interest;
- and
- one or more processors configured to execute computer program modules, the computer program modules including:
- a weight determination module configured to determine weights corresponding to the individual samples such that a weight of an individual sample is a function of the orientation of a wellbore from which the individual sample was acquired, wherein the weighting module is configured to determine the weight of the individual sample as a function of the cosine of the angle between the wellbore from which the individual sample was acquired and the vertical.
Electronic, computer-readable, non-transitory storage media storing instructions configured to cause one or more processors to execute a method of declustering samples of a property within a geophysical volume of interest, the method comprising:
- obtaining samples of a property within a subsurface volume of interest, the samples having been acquired from one or more wellbores formed within the subsurface volume of interest;
- and determining weights corresponding to the individual samples such that a weight of an individual sample is a function of the orientation of a wellbore from which the individual sample was acquired, wherein the weight of the individual sample is a function of the cosine of the angle between the wellbore from which the individual sample was acquired and the vertical.
Dependencies are inferred from the claim text.