关键词: 巴西, 坎普斯盆地, 盐下层系, 大型油气田, 勘探潜力

Abstract: A total of 15 oil and gas fields were found in the presalt sequences of Campos Basin in Brazil between 2002 and 2012, with the recoverable reserves reaching 7?á108t of oil equivalent. Of those discoveries, there are 11 large-scale oil and gas fields, highlighting the oil potential of Campos Basin and making the presalt sequences of this basin another hot spot for exploration after Santos Basin. Campos Basin experienced three structural development stages - rift period, transition period and drift period. The presalt sequences are the typical continental sedimentary system deposited during the rift period (from Late Jurassic to Early Aptian), including Hauterivian fracture-developed basement basalt andAptian to Barremian carbonate rock. The main source rock of the basin is black calcareous shale of Lagoa Feia group in Cretaceous Period, which has an excellent potential for sourcing. A number of reservoirs developed in the basin, where the presalt sequences are low in exploration degree. The current oil and gas proven rate is only about 50 percent, thus indicating a great potential for oil and gas exploration. Campos Basin has a very promising exploration prospect for the presalt sequences, which are supposed to be the field to see the quickest growth in reserves in the future. The focus area for exploration is the central uplift zone. The main reservoirs are Lago Feia group while the main traps are carbonate lithological-structural ones.