An oil shale formation may be treated using an in situ thermal process. Fluid migration into and/or out of a treatment area in the formation may be inhibited. In some embodiments, a barrier may be used to inhibit migration of fluids into and/or out of the treatment area. Heat may be provided to the treatment...http://www.google.de/patents/US7032660?utm_source=gb-gplus-sharePatent US7032660 - In situ thermal processing and inhibiting migration of fluids into or out of an in situ oil shale formation
