TY - SER AU - Olson,Robert TI - Majors return to Venezuela's heavy-oil patch in a marriage of convenience PY - 2010/// CY - PB - N2 - Transcripción del resumen del autor. Hugo Chavez has accepted that he needs to be pragmatic and bring in foreign oil companies' expertise and capital to develop Venezuela's Orinoco heavy-oil belt, argues Robert Olson ER -