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Abstract: Integration of Sequence Stratigraphy and Fault Population Studies in Integrated Reservoir Modelling Software for Field Development and Management

Stephen Flint, Andrew Heath, Simon Knight, John Walsh, Juan Watterson

Comprehensive datasets of a subsurface Carboniferous coastal plain succession in Alaska and large scale outcrops of Cretaceous shallow marine strata of the Book Cliffs, Utah, have been used in the development of 3-D reservoir modelling software which has functionality allowing modelling of sedimentary architectural elements, key stratigraphic surfaces, seismic and sub-seismic faults and well/seismic data. Application of high resolution sequence stratigraphic concepts allows deterministic correlation of flooding surfaces and sequence boundaries, prediction of spatial/temporal settings of well- and poorly-connected sands and guidelines for interpretation of channel dimensions.

Initial models allow 3-D visualisation of the reservoir and facilitate a better understanding of the distribution of heterogeneities. Subsequent assignment of attributes such as facies and permeability allow calculations and operations (e.g connectivity) to be carried out on the model.

The frequency and geometry of seismically resolved faults is used to predict likely numbers and sizes of sub-seismic faults, which may impact reservoir performance and compartmentalisation. Calculation of the deformation of the sequence architecture by sub-seismic faults and refinement of the cellularisation methods allows investigation of the juxtaposition and fault sealing effects on fluid flow.

The modelling system permits quantitative analysis of the relative importance of complex depositional architecture and sub-seismic faults on reservoir connectivity. However, the results of flow modelling are strongly dependent on the resolution of cellular models in relation to the scales of stratigraphic and structural features.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France