There are three things you need to be good at log interpretation: Identify, Interpret and Integrate.

1. Identify

Have an interest in what, why and how of the things you do. For instance, if you want to interpret a log, you need to know why you spend money to get the logs, how to tell good logs from the bad ones, and how to make full use of the logs.

2. Interpret

Interpret the log.

3. Integrate

Integrate the results. Remember that you are working with other people towards common goal. You may be the best at what you do, heck maybe a Super Petrophysicist, but if people can't, won't, or don't use the results that you give them, then it's pretty pointless.

Logs are not the only thing you look at. You look at other data too like cores, reports, seismic, well test results and others. So, a log analyst or a petrophysicist don't just interpret logs. They are interested in what they do and they integrate their work with others.