--> ABSTRACT: Stratigraphic Hierarchical Surface-Based Modeling of Clastic Reservoir Systems, by Sementelli, Kathryn; Varban, Bogdan ; Gai, Xiuli; Wu, Xiao-Hui; Robertson, Gregory; #90142 (2012)

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Stratigraphic Hierarchical Surface-Based Modeling of Clastic Reservoir Systems

Sementelli, Kathryn *1; Varban, Bogdan 1; Gai, Xiuli 1; Wu, Xiao-Hui 1; Robertson, Gregory 1
(1) ExxonMobil Upstream Research Company, Houston, TX.

Petroleuem industry modeling workflows occur in two parts: framework creation and petrophysical property modeling. Framework creation requires compromising structural complexity and property modeling algorithms do not adequately capture nor predict important heterogeneities that impact reservoir flow behavior in clastic reservoirs. Dependable prediction of complex stratigraphy and reservoir characterization is desired in order to adequately assess reservoir behavior in simulation. ExxonMobil Upstream Research Company developed a new method of static reservoir modeling of channelized features by integrating a surfaced-based modeling approach with geometric representations of sedimentary bodies, defined as primitives. The technique operates by utilizing basic input data (channel centerline) to distribute primitives based on stratigraphic hierarchy and processed based sedimentology principles. The primitives in the channelized system are constructed to create complex reservoir frameworks and facies distributions. More realistic representations of features are created with this tool. Valid stratigraphic architectures are achieved with an increase in the geologic primitive complexity. Each primitive is defined by multiple parameters that are assembled to represent bodies found in various environments of deposition, such as confined and distributive channel features. The resulting framework is populated with reservoir facies to control distribution of reservoir properties. Reservoir property distribution utilizes trends associated with the surfaces, input conditioning data, and any observed patterns. Primitives produce interfaces that partition the volume based on the stratigraphic hierarchy desired by the user. These interfaces are treated as surfaces and are assigned properties. This tool captures critical barriers, baffles, and flow conduits that are often below resolution of current modeling practices. One example of the tools is to create lateral accretion packages in a confined meandering channel. Each surface may represent a barrier to flow, depending on well placement, thus impacting field development. The hierarchical surface-based modeling approach allows for efficient and reliable characterization of geologic concepts for a channelized reservoir. The use of non-unique geologic primitives highlights the ease for modeling in various environments of deposition by reusing primitives that are catered to fit a new model by controlling limited parameters.

 

AAPG Search and Discovery Article #90142 © 2012 AAPG Annual Convention and Exhibition, April 22-25, 2012, Long Beach, California