Well log channel matching

1. A method, comprising:

a non-transitory computer readable storage medium storing a set of well log channels and a set of contexts linked to the set of well log channels, wherein the set of well log channels further comprises an unknown well log channel for which a link to a corresponding context is missing;

calculating a first set of hash values for the set of well log channels, wherein calculating comprises:

transforming the set of well log channels into a spectrogram structure stored in the non-transitory computer readable storage medium, wherein the spectrogram structure comprises an anchor point paired with a plurality of target points, and

generating the first set of hash values using the anchor point and the plurality of target points;

extracting a well log channel snippet from the unknown well log channel;

calculating, using a second anchor point and a second plurality of target points of the unknown well log channel within the snippet, a second set of hash values;

identifying, for the unknown well log channel, a matching well log channel by searching the first set of hash values with the second set of hash values; and

storing in the non-transitory computer readable storage medium, for the unknown well log channel, a channel context corresponding to the matching well log channel as the corresponding context.

2. The method of claim 1 ,

wherein the anchor point comprises an anchor depth and an anchor frequency,

wherein the set of target points comprises a target point comprising a target depth and a target frequency, and

wherein a subset of the first set of hash values is calculated using the anchor frequency of the anchor point in a respective anchor/target pair, the target frequency of the target point in the respective anchor/target pair, and the difference between the anchor depth of the anchor point in the respective anchor/target pair and the target depth of the target point in the respective anchor/target pair.

3. The method of claim 1 , further comprising:

pairing the anchor point with the plurality of target points to obtain a set of anchor/target pairs,

wherein a subset of the second set of hash values is calculated using the set of anchor/target pairs.

4. The method of claim 1 , further comprising:

associating, with the first set of hash values, a first set of depth offsets relative to the set of well log channels; and

associating, with the second set of hash values, a second set of depth offsets relative to the well log channel snippet.

5. The method of claim 4 , wherein searching the first set of hash values using the second set of hash values comprises:

identifying a set of hash value matches comprising a hash value of the first set of hash values and a hash value of the second set of hash values;

calculating, for the set of well log channels, a set of depth offset deltas using the depth offsets associated with the hash values in the respective hash value match of the set of hash value matches; and

calculating a number of hash value matches for the respective depth offset delta of the set of depth offset deltas.

6. The method of claim 5 , wherein identifying the matching well log channel comprises:

scoring the set of well log channels using the number of hash value matches for the set of depth offset deltas.

7. A system, comprising:

a memory coupled to a computer processor;

a repository configured to store a set of well log channels and a set of contexts linked to the set of well log channels, wherein the set of well log channels further comprises an unknown well log channel for which a link to a corresponding context is missing; and

a well log channel matcher, executing on the computer processor and using the memory, configured to:

calculate a first set of hash values for the set of well log channels, wherein the well log channel matcher calculates by being configured to:

transform the set of well log channels into a spectrogram structure stored in the non-transitory computer readable storage medium, wherein the spectrogram structure comprises an anchor point paired with a plurality of target points, and

generate the first set of hash values using the anchor point and the plurality of target points;

extract a well log channel snippet from the unknown well log channel;

calculate, using a second anchor point and a second plurality of target points of the unknown well log channel within the snippet, a second set of hash values;

identify, for the unknown well log channel, a matching well log channel by searching the first set of hash values with the second set of hash values; and

store in the non-transitory computer readable storage medium, for the unknown well log channel, a channel context corresponding to the matching well log channel as the corresponding context.

8. The system of claim 7 ,

wherein the anchor point comprises an anchor depth and an anchor frequency,

wherein the set of target points comprises a target point comprising a target depth and a target frequency, and

wherein a subset of the first set of hash values is calculated using the anchor frequency of the anchor point in a respective anchor/target pair, the target frequency of the target point in the respective anchor/target pair, and the difference between the anchor depth of the anchor point in the respective anchor/target pair and the target depth of the target point in the respective anchor/target pair.

9. The system of claim 7 , wherein the well log channel matcher is further configured to:

pair the anchor point with the plurality of target points to obtain a set of anchor/target pairs,

wherein a subset of the second set of hash values is calculated using the set of anchor/target pairs.

10. The system of claim 7 , wherein the well log channel matcher is further configured to:

associating, with the first set of hash values, a first set of depth offsets relative to the set of well log channels; and

associate, with the second set of hash values, a second set of depth offsets relative to the well log channel snippet.

11. The system of claim 10 , wherein the well log channel matcher is further configured to search the first set of hash values using the second set of hash values by:

identifying a set of hash value matches comprising a hash value of the first set of hash values and a hash value of the second set of hash values,

calculating, for the set of well log channels, a set of depth offset deltas using the depth offsets associated with the hash values in the respective hash value match of the set of hash value matches, and

calculating a number of hash value matches for the respective depth offset delta of the set of depth offset deltas.

12. The system of claim 11 , wherein the well log channel matcher is further configured to identify the matching well log channel by:

scoring the set of well log channels using the number of hash value matches for the set of depth offset deltas.

13. A non-transitory computer readable medium storing a set of well log channels and a set of contexts linked to the set of well log channels, wherein the set of well log channels further comprises an unknown well log channel for which a link to a corresponding context is missing, and wherein the non-transitory computer readable storage medium further comprises instructions that, when executed by a computer processor, perform operations comprising:

calculating a first set of hash values for the set of well log channels, wherein calculating comprises:

transforming the set of well log channels into a spectrogram structure stored in the non-transitory computer readable storage medium, wherein the spectrogram structure comprises an anchor point paired with a plurality of target points, and

generating the first set of hash values using the anchor point and the plurality of target points;

extracting a well log channel snippet from the unknown well log channel;

calculating, using a second anchor point and a second plurality of target points of the unknown well log channel within the snippet, a second set of hash values;

identifying, for the unknown well log channel, a matching well log channel by searching the first set of hash values with the second set of hash values; and

storing in the non-transitory computer readable storage medium, for the unknown well log channel, a channel context corresponding to the matching well log channel as the corresponding context.

14. The non-transitory computer readable medium of claim 13 ,

wherein the anchor point comprises an anchor depth and an anchor frequency,

wherein the set of target points comprises a target point comprising a target depth and a target frequency, and

wherein a subset of the first set of hash values is calculated using the anchor frequency of the anchor point in a respective anchor/target pair, the target frequency of the target point in the respective anchor/target pair, and the difference between the anchor depth of the anchor point in the respective anchor/target pair and the target depth of the target point in the respective anchor/target pair.

15. The non-transitory computer readable medium of claim 13 , wherein the instructions further perform operations comprising:

pairing the anchor point with the plurality of target points to obtain a set of anchor/target pairs,

wherein a subset of the second set of hash values is calculated using the set of anchor/target pairs.

16. The non-transitory computer readable medium of claim 13 , wherein the instructions further perform operations comprising:

associating, with the first set of hash values, a first set of depth offsets relative to the set of well log channels; and

associating, with the second set of hash values, a second set of depth offsets relative to the well log channel snippet.

17. The non-transitory computer readable medium of claim 16 , wherein the instructions further perform operations comprising:

identifying a set of hash value matches comprising a hash value of the first set of hash values and a hash value of the second set of hash values;

calculating, for the set of well log channels, a set of depth offset deltas using the depth offsets associated with the hash values in the respective hash value match of the set of hash value matches;

calculating a number of hash value matches for the respective depth offset delta of the set of depth offset deltas; and

scoring the set of well log channels using the number of hash value matches for the set of depth offset deltas.

18. The non-transitory computer readable storage medium of claim 17 , wherein the instructions further perform operations comprising:

scoring the set of well log channels using the number of hash value matches for the set of depth offset deltas.