Society of Professional Well Log Analysts - Includes member services, well log mnemonics, software directory. Has 2000 members.

SCAWeb: The Society of Core Analysts - Promotes the technology of core analysis. Has 600 members. It is a chapter at large of the Society of Professional Well Log Analysts. Based in Dallas, Texas.

Society of Petroleum Engineers - Serves professional engineers, scientists, and managers in the exploration and production segments of the worldwide oil and gas industry.

Canadian Society of Petroleum Geologists - Site includes member information, convention information, news, and publications. Publishes books, a magazine and a technical journal. Has 3500 members.

PGK - Petroleum Geological Circle - Dutch professional society of petroleum geologists and engineers. In English.

Petroleum Exploration Association of New Zealand Inc. - Promoting the interests of petroleum producers and explorers in New Zealand.