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Effect of clay minerals on the effective pressure law in clay-rich sandstones

机译：粘土矿物对富粘土砂岩有效压力规律的影响

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摘要

The relative sensitivity of permeability to pore fluid pressure P-p and confining pressure P-c of rocks can be expressed as the effective pressure coefficient n(k). To investigate the effect of clay minerals on n(k), permeability data were measured in clay-rich sandstones under conditions of lowering P-p at different constant-confining pressures, and the effective pressure coefficients were subsequently calculated using a method based on our observation that the effective pressure law was linear. The values of n(k) in I/S-sandstones and chlorite-sandstone agreed with the clay shell model, while the values of n(k) in kaolinite-sandstones were consistent with the clay particle model. However, the n(k) values of our kaolinite-sandstones were less than 1.0, which is different from previous observations showing n(k) greater than 1.0. The n(k) value of our I/S-sandstone saturated with formation water was greater than 1.0, consistent with the previous results, but the n(k) value of our I/S-sandstone saturated with dried nitrogen was lower than 1.0. Thus, the coefficient n(k) was affected by the type of clay mineral, the preparation of the samples, and the type of the pore fluid. (C) 2015 Elsevier B.V. All rights reserved.
机译：渗透率对岩石孔隙流体压力P-p和围压P-c的相对敏感性可以表示为有效压力系数n（k）。为了研究粘土矿物对n（k）的影响，在不同的恒定围压下，在降低Pp的条件下，在富含粘土的砂岩中测量渗透率数据，随后使用基于我们的观察方法计算有效压力系数，即有效压力定律是线性的。 I / S砂岩和绿泥石砂岩中的n（k）值与黏土壳模型一致，而高岭石砂岩中的n（k）值与黏土颗粒模型一致。但是，我们的高岭石砂岩的n（k）值小于1.0，这与以前的观察结果表明n（k）大于1.0有所不同。与地层水饱和的I / S砂岩的n（k）值大于1.0，与先前的结果一致，但由干燥氮气饱和的I / S砂岩的n（k）值小于1.0 。因此，系数n（k）受粘土矿物类型，样品制备和孔隙流体类型的影响。 （C）2015 Elsevier B.V.保留所有权利。

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