Integration of seismic data in reservoir modeling through seismically constrained facies models

Abstract

Seismic data are an important source of information to guide and constrain reservoir modeling as it samples the subsurface in 3D away from wells. Seismic interpretations are used to constrain the structure of reservoir models. Different seismic attributes can support the identification and definition of stratigraphic features, and seismic inversion products can help constrain the rock properties. Different methods exist for integration of seismic data in the modeling process. Here, we present two new methods. The first method constrains facies definition and modeling with seismic data through a geobody earth modeling approach. The second method updates existing facies models with new seismic data using a Bayesian approach. Both methods are applied to a case study with good quality seismic data. The results show that the reservoir model becomes more consistent with the observed field seismic data when these fast and repeatable methods are applied (compared to not integrating seismic constraints or using time-intensive manual integration approaches), thus enabling more robust reservoir models and forecasts.

Geo-Body and Geostatistical Modelling of Carbonate Reservoir Facies Architecture and Characterization

“…Geo-Body and Geostatistical Modelling is a powerful tool in the field of geology and reservoir characterization, as it helps in understanding the subsurface heterogeneity, improving geological modeling accuracy, and making informed decisions in exploration and production activities [11]. The general steps involved in this methodology are shown in Fig.…”

“…Fig. (10)(11) shows the porosity and water saturation distribution along the Upper, Middle, and Lower sequences. Instead of taking a cut off on porosities/water saturation net to gross (NTG) calculations across the geo-bodies are performed using the following relation-NTG=Porosity value of the cell/Maximum porosity observed in the geo-bodies [16].…”

“…On the other hand, carbonate reservoirs are believed to hold more than 60% of the world's oil reserves and 40% of the world's gas reserves, indicating their importance [9]. The effect of their complex features, however, causes major hurdles in predicting facies architecture and reservoir properties [10][11][12]. The study area is on the Mumbai High-Deep Continental Shelf [13], on a westerly dipping gentle homo-clinal region (Fig.…”