Sedimentological and Stratigraphic Modeling Combining Membership Functions and Sequence Stratigraphy Principles

Pierre Kedzierski and A. Le Solleuz and Jean-Laurent Mallet and Jean-Jacques Royer. ( 2005 )
in: 25th gOcad Meeting, ASGA

Abstract

Three-dimensional stratigraphic models give quantitative information on geometry, sedimentological facies and distribution of sedimentary bodies. This paper suggests a new technique for including sequence stratigraphy concepts in stochastic reservoir simulation. In the sequence stratigraphy approach, transgressive/regressive cycles are interpreted as an interplay of accommodation space variation [A] infilled partially or completely by sediment supply [S]. Accommodation is computed as the sum of decompacted sedimentary layers and paleo–bathymetric variations for each given stratigraphic interval. The sediment supply is directly deduced from the decompacted sedimentary layers (preserved influx). The suggested methodology integrates well data, seismic survey and geologic outcrops within a 3D Wheeler diagram attached to the reservoir model. It is built using membership functions constrained by the observation data (lithology, depositional environment, paleobathymetry). The method uses two major sequence stratigraphy principles: (1) the A/S ratio concept, and (2) the sediment volume partitioning. Membership functions are estimated using DSI algorithms constrained by secondary information such as sedimentary bodies migration deduced from vertical (time) and laterally (space) A/S gradients, facies proportions and well data. Membership functions are then used to perform stochastic simulations of facies distribution and of sediment volumes.

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    BibTeX Reference

    @inproceedings{KedzierskiRM2005,
 abstract = { Three-dimensional stratigraphic models give quantitative information on geometry, sedimentological facies and distribution of sedimentary bodies. This paper suggests a new technique for including sequence stratigraphy concepts in stochastic reservoir simulation. In the sequence stratigraphy approach, transgressive/regressive cycles are interpreted as an interplay of accommodation space variation [A] infilled partially or completely by sediment supply [S]. Accommodation is computed as the sum of decompacted sedimentary layers and paleo–bathymetric variations for each given stratigraphic interval. The sediment supply is directly deduced from the decompacted sedimentary layers (preserved influx). The suggested methodology integrates well data, seismic survey and geologic outcrops within a 3D Wheeler diagram attached to the reservoir model. It is built using membership functions constrained by the observation data (lithology, depositional environment, paleobathymetry). The method uses two major sequence stratigraphy principles: (1) the A/S ratio concept, and (2) the sediment volume partitioning. Membership functions are estimated using DSI algorithms constrained by secondary information such as sedimentary bodies migration deduced from vertical (time) and laterally (space) A/S gradients, facies proportions and well data. Membership functions are then used to perform stochastic simulations of facies distribution and of sediment volumes. },
 author = { Kedzierski, Pierre AND Le Solleuz, A. AND Mallet, Jean-Laurent AND Royer, Jean-Jacques },
 booktitle = { 25th gOcad Meeting },
 month = { "june" },
 publisher = { ASGA },
 title = { Sedimentological and Stratigraphic Modeling Combining Membership Functions and Sequence Stratigraphy Principles },
 year = { 2005 }
}