Occurrence of deep carbonate reservoirs some considerations

Abstract

The presence of carbonate reservoirs at great dephts is primary related to: the creation of a rigid structural framework capable of withstanding burial forces, as is the case of dolomitized reservoirs, and the interruption of subsurface diagenetic processes that are the main cause of destruction of subsurface porosity. An effective mechanism for inhibiting these destructive processes is the entrance of hydrocarbons into the pores and the consequent displacement of water. The efficaciousness of these diagenetic processes is intrinsically linked to a senes of other variables, including depositional facies, early and subsurface diagenesis, burial history, and thermal history. Within the different processes and parameters involved, a favorable conjugation of lime and space factors will preserve significant porosity in carbonate sequences buried at great depths.