# US 11,905,809 B2 · Determining reservoir heterogeneity for optimized drilling location > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,905,809 B2 - Document ID: US11905809B2 - Status: Granted - Kind: B2 - Application number: 17/679,996 - Filed: 2022-02-24 - Published: 2023-08-24 - Granted: 2024-02-20 - Earliest claimed: 2022-02-24 - Assignees: Landmark Graphics Corporation - Applicants: Landmark Graphics Corporation - Inventors: Andrew Davies; Michael Simmons; Lawrence Cowliff; Estanislao Nicolás Kozlowski - Web page: https://patentgrep.com/patent/US11905809B2 ## CPC - E21B 43/25: Methods for stimulating production {(by vibrating earth formations E21B43/003)} - E21B 49/00: 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 - E21B 43/16: Enhanced recovery methods for obtaining hydrocarbons - E21B 47/003: Determining well or borehole volumes - E21B 2200/20: Computer models or simulations, e.g. for reservoirs under production, drill bits - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A system can determine a heterogeneity and a score for a reservoir for optimizing a drilling location. The system can receive a wireline log associated with a well that is positioned in a subterranean formation that includes a reservoir. The system can determine, using the wireline log, at least one statistical parameter for an interval of the well. The system can determine, using the at least one statistical parameter, a vertical heterogeneity of the reservoir. The system can determine, using the vertical heterogeneity, a score associated with the reservoir. The score can indicate an extraction difficulty and a carbon intensity of the reservoir. The system can output the score for optimizing a drilling location. ## Claims ### Claim 1 A system comprising: a processor; and a non-transitory computer-readable medium comprising instructions that are executable by the processor to cause the processor to perform operations comprising: receiving a wireline log associated with a well that is positioned in a subterranean formation that includes a reservoir; determining, using the wireline log, at least one statistical parameter for an interval of the well; generating delta data for the wireline log for determining the at least one statistical parameter for the interval of the well, wherein the delta data comprises one or more differences between two or more consecutive samples in the wireline log; determining, using the at least one statistical parameter, a vertical heterogeneity of the reservoir; determining, using the vertical heterogeneity, a score associated with the reservoir, the score indicating an extraction difficulty and a carbon intensity of the reservoir; and outputting the score for optimizing a drilling location. ### Claim 2 (depends on 1) The system of claim 1, wherein the operations further comprise: generating a plurality of synthetic wireline logs associated with a plurality of synthetic wells; determining a plurality of correlation coefficients for the plurality of synthetic wireline logs; determining a first correlation coefficient for the wireline log associated with the well and a second correlation coefficient for a second wireline log associated with a second well in a second reservoir; and determining, by comparing the first correlation coefficient with the second correlation coefficient and the plurality of correlation coefficients associated with the synthetic wireline logs, a lateral heterogeneity between the reservoir and the second reservoir. ### Claim 3 (depends on 2) The system of claim 2, wherein the operations further comprise determining, using heterogeneity metrics relating to the reservoir and the second reservoir, that the second reservoir is an analogue of the reservoir. ### Claim 4 (depends on 3) The system of claim 3, wherein the operations further comprise generating, in response to determining that the second reservoir is the analogue of the reservoir, a subsurface model for determining the vertical heterogeneity of the second reservoir. ### Claim 5 (depends on 1) The system of claim 1, wherein the delta data comprises a plurality of differences between a plurality of consecutive samples in the wireline log, and wherein the statistical parameter includes at least a delta variance of the delta data. ### Claim 6 (depends on 1) The system of claim 1, wherein the operations further comprise: receiving seismic data for the subterranean formation; and analyzing the seismic data for determining a seismic-scale heterogeneity associated with the reservoir. ### Claim 7 (depends on 1) The system of claim 1, wherein the operations further comprise generating a graphical user interface comprising a plurality of well locations and a plurality of total heterogeneity indices associated with the plurality of well locations. ### Claim 8 A method comprising: receiving, by a processor, a wireline log associated with a well that is positioned in a subterranean formation that includes a reservoir; determining, by the processor and using the wireline log, at least one statistical parameter for an interval of the well; generating, by the processor, delta data for the wireline log for determining the at least one statistical parameter for the interval of the well, wherein the delta data comprises one or more differences between two or more consecutive samples in the wireline log; determining, by the processor and using the at least one statistical parameter, a vertical heterogeneity of the reservoir; determining, by the processor and using the vertical heterogeneity, a score associated with the reservoir, the score indicating an extraction difficulty and a carbon intensity of the reservoir; and outputting, by the processor, the score for optimizing a drilling location. ### Claim 9 (depends on 8) The method of claim 8, further comprising: generating, by the processor, a plurality of synthetic wireline logs associated with a plurality of synthetic wells; determining, by the processor, a plurality of correlation coefficients for the plurality of synthetic wireline logs; determining, by the processor, a first correlation coefficient for the wireline log associated with the well and a second correlation coefficient for a second wireline log associated with a second well in a second reservoir; and determining, by the processor and by comparing the first correlation coefficient with the second correlation coefficient and the plurality of correlation coefficients associated with the synthetic wireline logs, a lateral heterogeneity between the reservoir and the second reservoir. ### Claim 10 (depends on 9) The method of claim 9, further comprising determining, using heterogeneity metrics relating to the reservoir and the second reservoir, that the second reservoir is an analogue of the reservoir. ### Claim 11 (depends on 10) The method of claim 10, further comprising generating, in response to determining that the second reservoir is the analogue of the reservoir, a subsurface model for determining the vertical heterogeneity of the second reservoir. ### Claim 12 (depends on 8) The method of claim 8, wherein the delta data comprises a plurality of differences between a plurality of consecutive samples in the wireline log, and wherein the statistical parameter includes at least a delta variance of the delta data. ### Claim 13 (depends on 8) The method of claim 8, further comprising: receiving, by the processor, seismic data for the subterranean formation; and analyzing, by the processor, the seismic data for determining a seismic-scale heterogeneity associated with the reservoir. ### Claim 14 (depends on 8) The method of claim 8, further comprising generating, by the processor, a graphical user interface comprising a plurality of well locations and a plurality of total heterogeneity indices associated with the plurality of well locations. ### Claim 15 A non-transitory computer-readable medium comprising instructions that are executable by a processor for causing the processor to perform operations comprising: receiving a wireline log associated with a well that is positioned in a subterranean formation that includes a reservoir; determining, using the wireline log, at least one statistical parameter for an interval of the well; generating delta data for the wireline log for determining the at least one statistical parameter for the interval of the well, wherein the delta data comprises one or more differences between two or more consecutive samples in the wireline log; determining, using the at least one statistical parameter, a vertical heterogeneity of the reservoir; determining, using the vertical heterogeneity, a score associated with the reservoir, the score indicating an extraction difficulty and a carbon intensity of the reservoir; and outputting the score for optimizing a drilling location. ### Claim 16 (depends on 15) The non-transitory computer-readable medium of claim 15, wherein the operations further comprise: generating a plurality of synthetic wireline logs associated with a plurality of synthetic wells; determining a plurality of correlation coefficients for the plurality of synthetic wireline logs; determining a first correlation coefficient for the wireline log associated with the well and a second correlation coefficient for a second wireline log associated with a second well in a second reservoir; and determining, by comparing the first correlation coefficient with the second correlation coefficient and the plurality of correlation coefficients associated with the synthetic wireline logs, a lateral heterogeneity between the reservoir and the second reservoir. ### Claim 17 (depends on 16) The non-transitory computer-readable medium of claim 16, wherein the operations further comprise determining, using heterogeneity metrics between the reservoir and the second reservoir, that the second reservoir is an analogue of the reservoir. ### Claim 18 (depends on 17) The non-transitory computer-readable medium of claim 17, wherein the operations further comprise generating, in response to determining that the second reservoir is the analogue of the reservoir, a subsurface model for determining the vertical heterogeneity of the second reservoir. ### Claim 19 (depends on 15) The non-transitory computer-readable medium of claim 15, wherein the delta data comprises a plurality of differences between a plurality of consecutive samples in the wireline log, and wherein the statistical parameter includes at least a delta variance of the delta data. ### Claim 20 (depends on 15) The non-transitory computer-readable medium of claim 15, wherein the operations further comprise: receiving seismic data for the subterranean formation; and analyzing the seismic data for determining a seismic-scale heterogeneity associated with the reservoir.