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- W2153750889 abstract "SummaryKnowledge of the pressure dependencies of rock properties in unconsolidated sands is important for accurate time-lapse feasibility studies, pore pressure prediction, and reservoir characterization. A key problem that arises in determining such pressure dependencies is an accurate model at low effective stress. We propose a double exponential model to describe the pressure sensitivity of the bulk modulus (K) or shear modulus (G) for unconsolidated sands. The physical basis for our model relies on observed porosity-depth trends in unconsolidated sands, and the concept of critical porosity. Our new model matches laboratory measurements on unsaturated sand samples that have a range of grain size distributions and compositions. Grain size distribution data is first used to estimate critical porosity, which is then used as a zero effective pressure constraint in the data fitting process. We show that our new model more accurately predicts pressure sensitivity near zero-effective pressure compared to current methods, and is thus more accurate for situations in which core measurements at low effective stresses are not available." @default.
- W2153750889 created "2016-06-24" @default.
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- W2153750889 date "2012-12-01" @default.
- W2153750889 modified "2023-10-16" @default.
- W2153750889 title "A new physical model for the pressure sensitivity of unconsolidated sands" @default.
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- W2153750889 doi "https://doi.org/10.1071/aseg2012ab119" @default.
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