In-Situ Combustion 2 : Burning a small part of the hydrocarbon to provide heat to reduce the viscosity of thermally crack the heavier ends. See: Fire Flood
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}