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A Dual Porosity Solid Substitution Recipe for Heavy Oil Rocks
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
Summary
Heavy oils production involves heating of the reservoir, which results in significant reduction of the pore fill viscosity. Seismic monitoring of these subsurface operations requires a model relating elastic properties of the heavy oil rocks at different temperatures. To this end, we developed a simple solid substitution scheme. Key feature of the model is division of porosity into stiff matrix pores and compliant cracks-like pores, which is important because presence of a solid material in compliant pores or cracks stiffens the rock to much greater extent than its presence in stiff pores. We approximate a typical compliant pore as a circular disc confined between rigid plates and surrounded by empty pores. The stiff pores are then embedded using generalized Gassmann’s equations. When the pore fill is solid, the predictions of the scheme are close to the predictions of the solid-squirt model recently proposed by Saxena and Mavko. However, the present scheme also gives a continuous transition to the classic Gassmann’s equations for a liquid pore fill at low frequencies and squirt theory at the high frequency limit.
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