Abstract
Stochastic sequential simulation is a common modelling technique used in Earth sciences and an integral part of iterative geostatistical seismic inversion methodologies. Traditional stochastic sequential simulation techniques based on bi-point statistics assume, for the entire study area, stationarity of the spatial continuity pattern and a single probability distribution function, as revealed by a single variogram model and inferred from the available experimental data, respectively. In this paper, the traditional direct sequential simulation algorithm is extended to handle non-stationary natural phenomena. The proposed stochastic sequential simulation algorithm can take into consideration multiple regionalized spatial continuity patterns and probability distribution functions, depending on the spatial location of the grid node to be simulated. This work shows the application and discusses the benefits of the proposed stochastic sequential simulation as part of an iterative geostatistical seismic inversion methodology in two distinct geological environments in which non-stationarity behaviour can be assessed by the simultaneous interpretation of the available well-log and seismic reflection data. The results show that the elastic models generated by the proposed stochastic sequential simulation are able to reproduce simultaneously the regional and global variogram models and target distribution functions relative to the average volume of each sub-region. When used as part of a geostatistical seismic inversion procedure, the retrieved inverse models are more geologically realistic, since they incorporate the knowledge of the subsurface geology as provided, for example, by seismic and well-log data interpretation.
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Acknowledgments
The authors would like to thank Galp E&P and ENMC for providing the data shown in this paper; Schlumberger for the donation of Petrel\(^{\circledR }\) and CGG for the donation of Hampson-Russell. We would also like to express our gratitude to CERENA for supporting this work. The authors would also like to acknowledge the comments of the anonymous reviewer which contributed to improving the quality of the original paper.
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Nunes, R., Soares, A., Azevedo, L. et al. Geostatistical Seismic Inversion with Direct Sequential Simulation and Co-simulation with Multi-local Distribution Functions. Math Geosci 49, 583–601 (2017). https://doi.org/10.1007/s11004-016-9651-0
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DOI: https://doi.org/10.1007/s11004-016-9651-0