SPE Member

Abstract

System dynamics modeling of flow and rock textures might be helpful for testing hypotheses on changing flow capability of reservoir rock. It is desireable to be able to model changing rock textures and flow capability in the computer because most reservoir rock volume is located away from cored wells and is not accessible for direct observation and measurement.

To use system dynamics modeling, a system must change over time. We know flow pathways change over time, because of diagenetic processes, and because of formation damage and production itself. System dynamics models are constructed by modeling assumptions about present conditions. System behavior, for example flow, is then simulated by changing certain specific conditions. when simulation results do not match our hypotheses, then either our hypotheses are wrong or our basic assumptions of the model are wrong. If simulation results mirror our expectations, then we have an effective model for communicating our assumptions and predictions to others. Thus dynamic modeling tests our ideas and hypotheses, and it communicates these to others. Because modeling is used in most disciplines, organizing geologic information in system dynamics format eases communication of geologic information across disciplines, presenting it explicitly.

A dynamic model that demonstrates interactions among small-scale stratigraphy and flow parameters in a core plug is presented here. It was developed using commercially available STELLA software. In the core plug and in the model, diagenetic processes have modified depositional textures. Data categories are organized into feedback loops according to suggested relative influences on each other. These influences are described by equations or "if-then" statements.

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