The Society of Petroleum Engineers (SPE) is a not-for-profit professional association whose more than 140,600 members in 144 countries are engaged in oil and gas exploration and production. SPE is a key resource for technical knowledge providing publications, events, training courses, and online resources at www.spe.org.

The American Association of Petroleum Geologists (AAPG) is one of the world’s largest professional geological societies with more than 40,000 members across 129 countries: www.aapg.org.