What are difference between production logging and general well logging in petroleum exploration?

Answer 1

Production logs are for analyzing wells already in production, with known hydrocarbons in place, or for looking for accessibility to inject (in the case that you need an injection well for creating a drive mechanism for other producing wells or disposing of produced water, etc.) Logging in exploration uses the same concept, but those logs are looking at the formation to see if it is conducive to hydrocarbon production. So, the difference between the two is only in what you read out of the log, basically you are looking at the same data for different answers. High resistivity generally leads to hydrocarbons, low resistivity is typically water, spotaneous potential logs and gamma ray logs read the kind of rock you are looking at (sand vs. shale). So, the only real difference in between a production log and a log used in exploration is only what you look for as an end result.