GEOCHEMICAL CHARACTERISTICS AND CHARGE HISTORY OF OIL IN THE UPPER CRETACEOUS M1 SANDSTONES (NAPO FORMATION) IN BLOCK T, ORIENTE BASIN, ECUADOR

摘要

Major oil discoveries have recently been made in Block T in the north of the Oriente Basin, Ecuador. The oil is reservoired in the M1 Sandstones of the Upper Cretaceous Napo Formation. To investigate the origin and charge history of the petroleum, a detailed geochemical study was carried out on 43 crude oil samples from 42 producing wells in Block T together with fluid inclusion analyses of three core samples from two wells.