Abstract: Hydrocarbons Associated with Igneous Rocks (North America and Worldwide)

immediate surroundings, condemning the surrounding sediments as overmature and the igneous rocks themselves as nonporous crystalline masses. However, these are misconceptions, and there is opportunity in moving beyond them. The maturation effect of the igneous activity is often overrated. Most shallow igneous intrusions are volumetrically too small to affect a large volume of rock and even flood basalts cool too quickly to have a marked effect. Most thermal effects are due to regional heating or hydrothermal circulation.