First EAGE Workshop on Pre-Salt Reservoir: from Exploration to Production

Summary not Available

The ability to differentiate between good quality carbonate reservoir and low permeability limestone or volcano-clastic lithology using seismic data is key to successful exploration and development in the Brazil pre-salt play. However, the reservoir characterization is strongly coupled with the imaging challenges associated with the complex overburden and lateral property variations. In order to gain insights into this problem, we carefully build 3D elastic models for a synthetic study using real data acquisition parameters and simulated full-wavefield elastic data. The synthetic data generated via elastic full-wave simulation closely resembles the actual data challenges, even under ideal settings. The richness of this dataset and the complexity of the model provides a laboratory to test various workflows and approaches from conventional processing/imaging/ inversion to more complex imaging and reservoir characterization workflows.

Summary not Available

Summary not Available

For the deep South-Atlantic Pre-Salt carbonate reservoirs information on reservoir heterogeneity between core and seismic scale is lacking. Worldwide non-marine carbonate reservoir analogues provide quantitative geometrical and petrophysical data. Large-scale outcrops with similar sedimentological, diagenetic, petrophysical and structural features give insight in reservoir controlling parameters from below core-scale up to seismic scale

Summary not Available

Summary not Available

The Brazilian Pre-Salt is undergoing rapid growth spurred by changes in local legislation, resulting in much increased demand for seismic data, especially Ocean Bottom Node data to characterize and monitor the complex carbonate reservoirs. This demand has led to a “traffic jam” of permit applications that will not allow surveys to be acquired where and when they are needed to influence business decisions. Increasing OBN seismic efficiency is one way to try to alleviate this congestion, by increasing the rate of node handling operations and the efficiency of source operations. We describe a model to estimate the duration and cost of such surveys, considering various scenarios for node deployment rates and number of seismic sources operating simultaneously. We identify the most efficient combinations that reduce idle time for the vessels. These include use of two autonomous source vessels or a single source vessel carrying quad and hexasource configurations. In all cases we use small volume seismic sources to reduce the acoustic energy output into the ocean. Field testing will be required to assess the ability of small sources (under 1000ci) to image the Pre-salt reservoirs, and the feasibility of deblending algorithms to preserve fidelity for 4D seismic monitoring.

Summary not Available