Beyond the mapping of our massive collection of geochemical data, our new BPSMAPS project also aims to add fundamental reservoir maps that show the distribution of the quality and presence attributes of the reservoirs along the Brazilian basins. The newest set of maps added this week includes porosity, net-to-gross and net reservoir maps of the main targets in the pre-salt area (see an example of the porosity maps in Figure 1). The BPS Geodatabase already includes wells’ reservoir characterization through the log/lab petrophysics and chrono-litho layers, where users can access and download the advanced plots and tables. Following our strategy of completing a map view of all petroleum system elements, BPS applied a classification technique to filter the most relevant attributes on a well-by-well basis to generate these new reservoir attribute maps. In these maps, the distribution of different reservoir locations can be predicted and overlaid with complementary information to help in the selection of the most attractive blocks. The models are consistent with the petroleum system inferences in the evaluated basins while also reproducing the wells’ priori information in the form of spatial interpolated values. Our main objective with the reservoirs maps is dealing with play assessment. The maps can be used to build Gross Depositional Environment (GDE) maps in which the reservoir presence and quality are combined to support the probability of success in finding new accumulations.
The reservoir maps play a fundamental role in the risk assessment of the pre-salt reservoirs by making it possible to forecast and discriminate reservoir and non-reservoir quality and presence for undrilled sites. The next step for BPSMAPS will be to compare the reservoir attributes with the geochemical attributes, aiming to contribute to solving the cracking, thermal evolution, CO2 variation and fluid type puzzle, as well as how their joint occurrence can be integrated for exploration assessment of the pre-salt and other prospective basins in Brazil.
Figure: Examples of the reservoir maps of pre-salt recently uploaded in the BPSMAP, showing the distribution of porosity for the Aptian (A) and Barremian (B) reservoir intervals. Together with these maps, there is a collection of other reservoir data that can be used to support volumetric and risk analysis.