Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. CA2965867 - DETERMINATION DE PETROFACIES TRANSVERSAUX NON-LINEAIRES A L'AIDE DU PARTITIONNEMENT DE GRAPHIQUES DE COMPARAISON

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]
WHAT IS CLAIMED IS:
1. A computer-implemented method for predicting hydrocarbon production from
subsurface reservoir by determining non-linear petrofacies, which comprises: receiving, by a computer system, a cross-plot of rock and fluid properties; partitioning, using a processor of the computer system, the cross-plot using a data frequency of data points in the cross-plot; and repartitioning, using the processor, the cross-plot by one of refining one or more partitions in the cross-plot using a data frequency of data points in an investigation window in the cross-plot and modifying one or more partitions in the cross-plot using a sensitivity analysis of data points in a predefined region to grow and a predefined region to reduce; and at least one of: storing the repartitioned cross-plot in a memory of the computer system; and displaying the repartitioned cross-plot on a display of the computer system.
2. The computer-implemented method of claim 1, further comprising: determining, using the processor, a data frequency minima and location within a Y~ΔY range and a X~ΔX range of the cross-plot; computing, using the processor, one or more partitions within the cross-plot using the data frequency minima and each respective location; determining, using the processor, a data-frequency maxima and location within a Y~ΔY range and a X~ΔX range of each region in the cross-plot formed by the one or more computed partitions; locating, using the processor, a source term for each region in the cross-plot using the data frequency maxima and each respective location; and partitioning, using the processor, the cross-plot using the source term for each respective region in the cross-plot.
3. The method of claim 1, further comprising: determining, using the processor, a data frequency of data points in each cell of an inscribed matrix in the cross-plot;
connecting, using the processor, each inscribed matrix cell with a data frequency that meets a petrofacies partition criteria to a contiguous inscribed matrix cell with a data frequency that meets the petrofacies partition criteria; defining, using the processor, each petrofacies region and each petrofacies partition formed by the connected inscribed matrix cells using a unique name and index identifier; and projecting, using the processor, each defined petrofacies region and each defined petrofacies partition from the inscribed matrix onto the cross-plot using each respective name and index identifier.
4. The computer-implemented method of claim 3, further comprising: connecting, using the processor, isolated cells in the inscribed matrix with a petrofacies partition comprising the connected inscribed matrix cells by enforcing a connected cell condition value.
5. The computer-implemented method of claim 3, further comprising: adding, using the processor, isolated cells in the inscribed matrix to cells forming a petrofacies region by enforcing a connected cell condition value.
6. The computer-implemented method of claim 2, wherein the investigation window is created in the cross-plot using a source term for a selected region in the cross-plot as a center and predetermined dimensions.
7. The computer-implemented method of claim 1, further comprising refining, using the processor, each partition in the cross-plot that intersects the investigation window by reorienting each intersecting partition to be tangent to a side of the investigation window that the intersecting partition intersects.
8. The computer-implemented method of claim 1, further comprising: measuring, using the processor, a distance between each data point in the region to reduce and a common partition between the region to reduce and the region to grow; and normalizing each distance.
9. The computer-implemented method of claim 8, further comprising assigning, using the processor, a predetermined threshold normalized distance to each normalized distance that does not meet the predetermined threshold normalized distance.
10. A non-transitory program carrier device tangibly carrying computerexecutable instructions for predicting hydrocarbon production from a subsurface reservoir by determining non-linear petrofacies, the instructions being executable to implement: receiving, by a computer system, a cross-plot of rock and fluid properties; partitioning, using a processor of the computer system, the cross-plot using a data frequency of data points in the cross-plot; repartitioning, using the processor, the cross-plot by one of refining one or more partitions in the cross-plot using a data frequency of data points in an investigation window in the cross-plot and modifying one or more partitions in the cross-plot using a sensitivity analysis of data points in a predefined region to grow and a predefined region to reduce; and at least one of: storing the repartitioned cross-plot in a memory of the computer system; and displaying the repartitioned cross-plot on a display of the computer system.
11. The program carrier device of claim 10, further comprising: determining, using the processor, a data frequency minima and location within a Y~ΔY range and a X~ΔX range of the cross-plot; computing, using the processor, one or more partitions within the cross-plot using the data frequency minima and each respective location; determining, using the processor, a data-frequency maxima and location within a Y~ΔY range and a X~ΔX range of each region in the cross-plot formed by the one or more computed partitions; locating, using the processor, a source term for each region in the cross-plot using the data frequency maxima and each respective location; and partitioning, using the processor, the cross-plot using the source term for each respective region in the cross-plot.
12. The program carrier device of claim 10, further comprising: determining, using the processor, a data frequency of data points in each cell of an inscribed matrix in the cross-plot; connecting, using the processor, each inscribed matrix cell with a data frequency that meets a petrofacies partition criteria to a contiguous inscribed matrix cell with a data frequency that meets the petrofacies partition criteria; defining, using the processor, each petrofacies region and each petrofacies partition formed by the connected inscribed matrix cells using a unique name and index identifier; and projecting, using the processor, each defined petrofacies region and each defined petrofacies partition from the inscribed matrix onto the cross-plot using each respective name and index identifier.
13. The program carrier device of claim 12, further comprising: connecting, using the processor, isolated cells in the inscribed matrix with a petrofacies partition comprising the connected inscribed matrix cells by enforcing a connected cell condition value.
14. The program carrier device of claim 12, further comprising: adding, using the processor, isolated cells in the inscribed matrix to cells forming a petrofacies region by enforcing a connected cell condition value.
15. The program carrier device of claim 11 wherein the investigation window is created in the cross-plot using a source term for a selected region in the cross-plot as a center and predetermined dimensions.
16. The program carrier device of claim 10, further comprising refining, using the processor, each partition in the cross-plot that intersects the investigation window by reorienting each intersecting partition to be tangent to a side of the investigation window that the intersecting partition intersects.
17. The program carrier device of claim 10, further comprising: measuring, using the processor, a distance between each data point in the region to reduce and a common partition between the region to reduce and the region to grow; and normalizing, using the processor, each distance.
18. The program carrier device of claim 17, further comprising assigning, using the processor, a predetermined threshold normalized distance to each normalized distance that does not meet the predetermined threshold normalized distance.
19. A non-transitory program carrier device tangibly carrying computerexecutable instructions for predicting hydrocarbon production from a subsurface reservoir by determining non-linear petrofacies, the instructions being executable to implement: receiving, by a computer system, a cross-plot of rock and fluid properties; partitioning, using a processor of the computer system, the cross-plot using a data frequency of data points in the cross-plot; repartitioning, using the processor, the cross-plot by modifying one or more partitions in the cross-plot using a sensitivity analysis of data points in a predefined region to grow and a predefined region to reduce; measuring, using the processor, a distance between each data point in the region to reduce and a common partition between the region to reduce and the region to grow; normalizing, using the processor, each distance; and at least one of: storing the repartitioned cross-plot in a memory of the computer system; and displaying the repartitioned cross-plot on a display of the computer system.
20. The program carrier device of claim 19, further comprising assigning, using the processor, a predetermined threshold normalized distance to each normalized distance that does not meet the predetermined threshold normalized distance.