Despiking reservoir properties

Patent metadata

Field	Value
Publication number	US-11248448-B2
Application number	US-202016780196-A
Country	US
Kind code	B2
Filing date	Feb 3, 2020
Priority date	Feb 3, 2020
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A computer system receives multiple datapoints of a geomechanical property of a hydrocarbon reservoir modeled by a three-dimensional (3D) grid. Each datapoint corresponds to a respective grid cell of the 3D grid. Each grid cell of the 3D grid is represented by 3D coordinates. For each grid cell of the 3D grid, the computer system generates a data component of the geomechanical property based on the 3D coordinates of the grid cell. The computer system adds the data component to a datapoint corresponding to the grid cell to provide an augmented set of datapoints. The computer system transforms the augmented set of datapoints into a Gaussian distribution using Gaussian approximation. The computer system simulates the geomechanical property of the hydrocarbon reservoir based on the Gaussian distribution using sequential Gaussian simulation. A display device of the computer system generates a graphical representation of the geomechanical property of the hydrocarbon reservoir based on the sequential Gaussian simulation.

First claim

What is claimed is:

1. A method comprising:
receiving, by a computer system, a plurality of datapoints of a geomechanical property of a hydrocarbon reservoir modeled by a three-dimensional (3D) grid, each datapoint of the plurality of datapoints corresponding to a respective grid cell of the 3D grid, each grid cell of the 3D grid represented by 3D coordinates;
for each grid cell of the 3D grid:
generating, by the computer system, a data component of the geomechanical property based on the 3D coordinates of the grid cell, wherein the data component is generated using a sum of the 3D coordinates of the grid cell; and
adding, by the computer system, the data component to a datapoint corresponding to the grid cell to provide an augmented plurality of datapoints;

transforming, by the computer system, the augmented plurality of datapoints into a Gaussian distribution using Gaussian approximation;
simulating, by the computer system, the geomechanical property of the hydrocarbon reservoir based on the Gaussian distribution using sequential Gaussian simulation; and
generating, by a display device of the computer system, a graphical representation of the geomechanical property of the hydrocarbon reservoir based on the sequential Gaussian simulation.

2. The method of claim 1 , wherein the data component is a number of orders of magnitude smaller than the datapoint corresponding to the grid cell, and the number is in a range from 5 to 8.

3. The method of claim 1 , wherein simulating the geomechanical property comprises deleting, by the computer system, the data component for each grid cell of the 3D grid from the sequential Gaussian simulation to provide the geomechanical property at a plurality of locations of the hydrocarbon reservoir.

4. The method of claim 1 , wherein transforming the augmented plurality of datapoints comprises:
ranking, by the computer system, each augmented datapoint of the augmented plurality of datapoints with a rank within the Gaussian distribution; and
assigning, by the computer system, each augmented datapoint of the augmented plurality of datapoints to a value of the geomechanical property based on the rank.

5. The method of claim 1 , wherein the Gaussian approximation is based on Gaussian kernels or multiplicative skewing.

6. The method of claim 1 , further comprising applying, by the computer system, a logarithm transformation to the plurality of datapoints to reduce an amount of skew in the plurality of datapoints.

7. A non-transitory computer-readable storage medium storing instructions executable by one or more computer processors, the instructions when executed by the one or more computer processors cause the one or more computer processors to:
receive a plurality of datapoints of a geomechanical property of a hydrocarbon reservoir modeled by a 3D grid, each datapoint of the plurality of datapoints corresponding to a respective grid cell of the 3D grid, each grid cell of the 3D grid represented by 3D coordinates;
for each grid cell of the 3D grid:
generate a data component of the geomechanical property based on the 3D coordinates of the grid cell, wherein the data component is generated using a sum of the 3D coordinates of the grid cell; and
add the data component to a datapoint corresponding to the grid cell to provide an augmented plurality of datapoints;

transform the augmented plurality of datapoints into a Gaussian distribution using Gaussian approximation;
simulate the geomechanical property of the hydrocarbon reservoir based on the Gaussian distribution using sequential Gaussian simulation; and
generate, by a display device, a graphical representation of the geomechanical property of the hydrocarbon reservoir based on the sequential Gaussian simulation.

8. The non-transitory computer-readable storage medium of claim 7 , wherein the data component is a number of orders of magnitude smaller than the datapoint corresponding to the grid cell, and the number is in a range from 5 to 8.

9. The non-transitory computer-readable storage medium of claim 7 , wherein simulating the geomechanical property causes the one or more computer processors to delete the data component for each grid cell of the 3D grid from the sequential Gaussian simulation to provide the geomechanical property at a plurality of locations of the hydrocarbon reservoir.

10. The non-transitory computer-readable storage medium of claim 7 , wherein transforming the augmented plurality of datapoints causes the one or more computer processors to:
rank each augmented datapoint of the augmented plurality of datapoints with a rank within the Gaussian distribution; and
assign each augmented datapoint of the augmented plurality of datapoints to a value of the geomechanical property based on the rank.

11. The non-transitory computer-readable storage medium of claim 7 , wherein the Gaussian approximation is based on Gaussian kernels or multiplicative skewing.

12. The non-transitory computer-readable storage medium of claim 7 , wherein the instructions further cause the one or more computer processors to apply a logarithmic transform to the plurality of datapoints to reduce an amount of skew in the plurality of datapoints.

13. A computer system comprising:
one or more computer processors; and
a non-transitory computer-readable storage medium storing instructions executable by the one or more computer processors, the instructions when executed by the one or more computer processors cause the one or more computer processors to:
receive a plurality of datapoints of a geomechanical property of a hydrocarbon reservoir modeled by a 3D grid, each datapoint of the plurality of datapoints corresponding to a respective grid cell of the 3D grid, each grid cell of the 3D grid represented by 3D coordinates;
for each grid cell of the 3D grid:
generate a data component of the geomechanical property based on the 3D coordinates of the grid cell, wherein the data component is generated using a sum of the 3D coordinates of the grid cell; and
add the data component to a datapoint corresponding to the grid cell to provide an augmented plurality of datapoints;

transform the augmented plurality of datapoints into a Gaussian distribution using Gaussian approximation;
simulate the geomechanical property of the hydrocarbon reservoir based on the Gaussian distribution using sequential Gaussian simulation; and
generate, by a display device, a graphical representation of the geomechanical property of the hydrocarbon reservoir based on the sequential Gaussian simulation.

14. The system of claim 13 , wherein the data component is a number of orders of magnitude smaller than the datapoint corresponding to the grid cell, and the number is in a range from 5 to 8.

15. The system of claim 13 , wherein simulating the geomechanical property causes the one or more computer processors to delete the data component for each grid cell of the 3D grid from the sequential Gaussian simulation to provide the geomechanical property at a plurality of locations of the hydrocarbon reservoir.

16. The system of claim 13 , wherein transforming the augmented plurality of datapoints causes the one or more computer processors to:
rank each augmented datapoint of the augmented plurality of datapoints with a rank within the Gaussian distribution; and
assign each augmented datapoint of the augmented plurality of datapoints to a value of the geomechanical property based on the rank.

17. The system of claim 13 , wherein the Gaussian approximation is based on Gaussian kernels or multiplicative skewing.

Assignees

• Saudi Arabian Oil Co

Inventors

• Zhang Xingquan
• Ashraf Muhammad

Classifications

• E21B49/00

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title

• G06F30/20

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title

• G01V2210/665

  using geostatistical modeling · CPC title

• E21B41/0092 Primary

  Fixed Constructions · mapped topic

• E21B41/00 Primary

  Equipment or details not covered by groups E21B15/00 - E21B40/00 · CPC title