Creep compaction of quartz aggregates: Effects of pore-fluid flow--A combined experimental and theoretical study

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ID: 298750
2003
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Abstract
Creep compaction experiments were conducted in flow-through reactors at 150°C and 34.5 MPa of effective pressure to investigate the effects of pore-fluid flow on creep compaction rate. The starting materials were St. Peter quartz sand (124-180 μm and 250-350 μm) and disaggregated novaculite (10-60 μm). Theoretical analysis was carried out to investigate the relationships between flow velocity (residence time), solute concentration in pore fluid, the removal rate of dissolved material, the grain-convergence rate due to grain-contact dissolution, and compaction rate. Creep-compaction experiments indicate that the compaction rate of quartz aggregates is related to fluid flow rates. Compaction rates increase by factors up to 6 as flow rate increases from zero to between 0.13 and 0.15 ml/h. The modeling results are similar to the experiments, and indicates that pore-fluid flow affects compaction through its control of solute concentration. When the input-fluid concentration is lower than the pore-fluid equilibrium concentration, an increase in flow velocity (a decrease in residence time) leads to higher removal rate of dissolved materials from the system, lower solute concentration, and more rapid grain convergence and compaction. The grain-convergence rate would even become lower than that in a closed system if the input-fluid concentration is higher than the pore-fluid equilibrium concentration. The effects of fluid flow on grain convergence rate also vary with grain size, strain, and grain-boundary properties. In reservoir sandstones, descending fluids that heat up would become undersaturated and then enhance compaction, whereas ascending fluids that cool would become supersaturated and then slow or inhibit further compaction.
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openalex_W2035668746 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wei He
Journal american journal of science
Year 2003
DOI
10.2475/ajs.303.2.73
URL
https://doi.org/10.2475/ajs.303.2.73
Keywords Keywords not found

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