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System and method of using spatially independent subsets of data to calculate property distribution uncertainty of spatially correlated reservoir data

A data subset, uncertainty technique, applied in the field of statistical analysis of petrophysical data, which can solve problems that are not used to determine distribution uncertainty, attribute distribution uncertainty, etc.

Inactive Publication Date: 2014-07-16
CHEVROU USA INC
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Problems solved by technology

But these methods are only used to determine the uncertainty of the mean of the attribute distribution
These methods have not been used to determine the uncertainty of the distribution itself

Method used

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  • System and method of using spatially independent subsets of data to calculate property distribution uncertainty of spatially correlated reservoir data
  • System and method of using spatially independent subsets of data to calculate property distribution uncertainty of spatially correlated reservoir data
  • System and method of using spatially independent subsets of data to calculate property distribution uncertainty of spatially correlated reservoir data

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Embodiment Construction

[0015] According to one aspect of the present disclosure, there is provided a method of estimating uncertainty in property distributions, i.e., histograms and cumulative distribution functions related to reservoir properties such as shale volume, porosity, saturation, etc., within a reservoir volume of interest associated uncertainties.

[0016] figure 1 is a flowchart of a method of determining uncertainty in reservoir property distribution or petrophysical sample data according to an embodiment of the present invention. The method determines uncertainty in rock or reservoir property data without requiring the sample property data to be independent, wherein the sample data includes correlated data. The method includes inputting sample rock property data at S10.

[0017] In one embodiment, the sample data includes, for example, cased hole samples or already assigned samples in a grid. For example there are situations where only partial sampling of a population is available ...

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Abstract

A system and a method, implemented on a computer, for calculating property distribution uncertainty of spatially correlated petrophysical data are provided. The method includes inputting, into the computer, a sample petrophysical data comprising correlated data; applying, using the computer, a variogram to the sample petrophysical data to select a plurality of subsets of data, the subsets of data being substantially less correlated than the sample petrophysical data; and applying, using the computer, a bootstrap process on each of the plurality of subsets of data to obtain a plurality of bootstrap data sets from each of the plurality of subsets of data. The method further includes calculating data distributions for each of the obtained plurality of bootstrap data sets; ranking the data distributions by using a selected statistical parameter to obtain ranked data distributions; and characterizing the uncertainty based on the ranked data distributions.

Description

[0001] Cross References to Related Applications [0002] This application relates to the title "SYSTEM AND METHOD OF USING SPATIALLY INDEPENDENT SUBSETS OF DATA TO DETERMINE THE UNCERTAINTY OF SOFT-DATA DEBIASING OF PROPERTY DISTRIBUTIONS FOR SPATIALLY CORRELATED RESERVOIR DATA (using spatially independent data subsets to determine the System and method for uncertainty of soft data debiasing of attribute distribution of stored data)" and titled "METHOD OF USING SPATIALLY INDEPENDENT SUBSETS OF DATA TO CALCULATE VERTICAL TREND CURVE UNCERTAINTY OF SPATIALLY CORRELATED RESERVOIR DATA (using spatially Method for Computing Uncertainties of Vertical Trend Curves of Spatially Correlated Storage Data Using Independent Data Subsets), both of which were filed concurrently with this patent application and are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates generally to statistical analysis of petrophysical data, and more particu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G06F17/18G01V9/00G16Z99/00
CPCF04C2270/0421G06F17/40E21B49/00G16Z99/00G01V20/00
Inventor J·索恩
Owner CHEVROU USA INC
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