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3D Stratigraphic models: representation and stochastic modelling

By Guillaume Caumon and Jean-Laurent Mallet

Abstract

International audienceSeveral representations have been proposed to model the 3D architecture and petrophysical properties of stratigraphic formations from subsurface data. All methods aim at finding a consistent way of describing heterogeneities by defining a curvilinear coordinate system conform to the sedimentary layers. Classically, this coordinate system is implicitly defined by a grid conforming to the strata and to the faults; alternatively, the Geo-chronological model (Geochron) explicitly defines this coordinate system, without using such a grid. This paper compares the grid-based stratigraphic modeling methods with the Geochron method. Their ability to represent complex fault networks is discussed, proving the higher representative power of the Geochron model. Because the visualization of uncertainty calls for generating several possible images of the subsurface, we also discuss grid perturbation methods, and introduce a new method to stochastically perturb a Geochron model

Topics: Stratigraphic modeling, uncertainty, time-stratigraphy, inverse modeling, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology
Publisher: HAL CCSD
Year: 2006
OAI identifier: oai:HAL:hal-01795303v1
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