Method for validating non-matrix vug features in subterranean rocks
A method of determining a validated vug interpretation log for performing a reservoir fluid flow simulation is disclosed. The method including obtaining a set of well logs from a wellbore, where at least one of the set of well logs may be used as a validating resistivity log, producing an initial vug interpretation log based on at least one of the well logs, and determining a scaled resistivity log from the validating resistivity log The method further includes determining a validated vug interpretation log based, at least in part, on the scaled resistivity log and the initial vug interpretation log; and performing a reservoir fluid flow simulation based, at least in part, on the validated vug interpretation log.
1. A method comprising:
obtaining a set of well logs from a wellbore, wherein at least one of the set of well logs comprises a validating resistivity log;
producing an initial vug interpretation log based on at least one of the set of well logs other than the validating resistivity log;
determining a scaled resistivity log from the validating resistivity log;
determining a validated vug interpretation log by determining a resistivity ratio between the scaled resistivity log and the initial vug interpretation log, wherein one or more resistivity ratios among the validated vug interpretation log that are greater than a predetermined value indicate a depth location of a vug;
performing a reservoir fluid flow simulation based on the validated vug interpretation log;
updating a wellbore plan based on the reservoir fluid flow simulation, wherein the wellbore plan comprises a wellbore path; and
further drilling, using a drilling system, the wellbore based on the wellbore plan and guided by the wellbore path.
2. The method of claim 1 , wherein determining the scaled resistivity log comprises a logarithmic scaling of the validating resistivity log.
3. The method of claim 1 , wherein producing the initial vug interpretation log comprises a linear scaling of a fractional volume of vugs of the initial vug interpretation log.
4. The method of claim 1 , wherein the validating resistivity log comprises a shallow resistivity log.
5. The method of claim 1 , wherein the initial vug interpretation log is produced from an electrical image log of a wall of the wellbore.
6. A system comprising:
a logging system configured to obtain a set of well logs from a wellbore;
a computer processor configured to:
receive the set of well logs from the logging system, wherein at least one of the set of well logs comprises a validating resistivity log,
produce an initial vug interpretation log based on at least one of the set of well logs other than the validating resistivity log,
determine a scaled resistivity log from the validating resistivity log,
determine a validated vug interpretation log by determining a resistivity ratio between the scaled resistivity log and the initial vug interpretation log, wherein one or more resistivity ratios among the validated vug interpretation log that are greater than a predetermined value indicate a depth location of a vug, and
perform a reservoir fluid flow simulation based on the validated vug interpretation log;
a wellbore path planning system configured to update a wellbore plan a based on the reservoir fluid flow simulation, wherein the wellbore plan comprises a wellbore path; and
a drilling system configured to further drill the wellbore based on the wellbore plan and guided by the wellbore path.
7. The system according to claim 6 , wherein determining the scaled resistivity log comprises a logarithmic scaling of the validating resistivity log.
8. The system according to claim 6 , wherein producing the initial vug interpretation log comprises a linear scaling of a fractional volume of vugs of the initial vug interpretation log.
9. The system according to claim 6 , wherein the validating resistivity log comprises a shallow resistivity log.
10. The system according to claim 6 , wherein the initial vug interpretation log is produced from an electrical image log of a wall of the wellbore.
11. The method of claim 1 , further comprising:
determining a vug size of the vug based on a rock sample; and
performing the reservoir fluid flow simulation based on the vug size.
12. The system of claim 6 , wherein the computer processor is further configured to:
determine a vug size of the vug based on a rock sample; and
perform the reservoir fluid flow simulation based on the vug size.