Since 1997, with acquisition of a new seismic<br>detector 3D for studies of reservoirs, Marlim Field<br>has become the unique oil field at Campos Basin with<br>two seismic surveys. In view of the natural<br>congestion by production equipment, geometry and<br>acquisition parameters were different from those used<br>in the first survey (old volume), acquired in 1986 by<br>the exploration of the Company. This project was to<br>respond if the anticipated production of oil and the<br>total volume of injected water would have been<br>sufficient to generate seismic marks that could stand<br>out concerning the expected noises associated with<br>such unequal acquisitions.<br>In this work a multi-disciplinary study based on<br>simulation of fluid flow and seismic modeling<br>incorporating characteristic features of the Marlim<br>field based on the reinterpretation of Marlim pseudo<br>4D showed that a major part of the differences<br>encountered on the maps, is probably associated to<br>artifacts generated by remarkable geologic events<br>such as the fault that limits the field at the east board<br>and Marlim Canyon. The unsuccessfulness of this<br>new-old pair is associated to the small volume of<br>injected water and the proximity of the injecting area<br>with the major fault on the field board. In view of the<br>nature of the reservoirs (bright spots of oil), the<br>continuity of efforts to monitoring water fronts should<br>be held in this field and the year 2003 was considered<br>ideal for a new acquisition, regarding the water<br>volume and the difficulties of reduction or<br>elimination of the fault artifacts.


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