Skip to main content

Turbidity current sediment modeling in a rift basin

Turbidites are the main reservoir rocks in many sedimentary basins. Through well log profiles and using stratigraphy of high-resolution sequences, 6 stratigraphic surfaces of 3 and 4 order were interpreted. These surfaces were defined trough facies association (cores) and petrofacies (thin sections). Each surface has an electrical signature and a seismic amplitude. Correlating wells and mapping the seismic lines, the 2D and 3D stratigraphic surfaces are then obtained. With Schlumberger's Petrel a seismic and stratigraphic verification points were defined. Then the 3D structural model was built by the faults and zones of the top and bottom layers. For this area, a Grid with 50X50m cell size (horizontal limit) was defined. Following this, the pillar gridding and the layering are generated. For facies modeling, a facies profile was obtained in the stratigraphic sections trough the correlation between logs and rock. A good log and seismic signature can separate the reservoirs (sandstones), from the source rock (shale) and carbonates. Histograms are necessary to define the accuracy and representativeness of the model, defining the vertical modeling limit. To complete the model, it is necessary after the study with histograms, the scale up of the model and if necessary, insert a trend (a paleocurrent for example). The most representative interpolation method for this model was SIS Modeling (Sequential Indicator Simulation). The result was considered satisfactory and correlated with the profiles of existing wells, indicating a methodology to be used constantly by the industry. This serves the O&G sector, geothermal energy and groundwater exploration.


Aglaia Brandao1, De Ros Luis F.2, Catuneanu Octavian3
1Prof. Burmeier Ingenieurgesellschaft mbH, Germany; 2Federal do Rio Grande do Sul University; 3Alberta University
GeoKarlsruhe 2021