In recent years

Brazil offshore has become one of the hot areas atracting international investments.In order to lower exploration risk

we studied the basic elements of total petroleum system in Campos Basin

including source rocks

reservoir rocks

traps and seals by integrating geophysical prospecting and well data

analyzed four kinds of typical subtle traps discovered in this basin

and proposed that subtle traps have large exploration potentials in this basin.Since the formation of the basin in the Early Cretaceous

it has experienced three evolution stages

including rifting

early drifting and late drifting stages

and developed three megasequences of non-marine

transitional and marine facies respectively.Three sets of source rocks possibly occur in the strata from the Lower Cretaceous to the Neogene in Campos Basin and the most important source rocks is the Lower Cretaceous Lagoa Feia Formation

from which all the discovered oil/gas in the basin were sourced.Various oil/gas reservoirs have been discovered in all the formations from the Lower Cretaceous to the Miocene

including fractured basalt in the basement

bioclastics in the Lagoa Feia Formation

carbonates in the Maca? Formation

clastic reservoirs and marine turbidites in the Upper Cretaceous-Oligocene.Subtle traps are very important in the basin and are dominated by stratigraphic traps including overlap traps

buried-hill traps and unconformity traps.More attention should be paid to the exploration of subtle traps

especially lithologic traps and fractured subtle traps.