Relationship between low-frequency electrical properties and hydraulic permeability of low-permeability sandstones
Relationship between low-frequency electrical properties and hydraulic permeability of low-permeability sandstones
复制标题
低渗透砂岩低频电性能与水力渗透率的关系
作者：
N. Zisser;A. Kemna;G. Nover
岩石的低频电性与水力渗透率之间的关系，为原位、无创地估计岩石渗透率提供了可能，长期以来一直是地球物理研究的重点。研究人员对某致密气藏低渗透砂岩的水力、低频（10 mHz ~ 100 Hz）电特性以及各向异性特性进行了测试。发现单频电学性质对所研究样品的磁导率的测定价值较低，而光谱诱导极化（SIP）响应与磁导率之间存在很强的联系。使用Debye分解程序将SIP响应转换为松弛时间分布。我们观察到分布的中位松弛时间与渗透率之间呈幂律形式的强正相关，表明松弛时间是有效水力长度尺度的良好度量。从…
The relationship between low-frequency electrical properties and hydraulic permeability of rocks has been the focus of geophysical investigations for a long time because it offers a possibility for an in situ and noninvasive permeability estimation of rocks. We examined the hydraulic and low-frequency (10 mHz to 100 Hz) electrical properties as well as the anisotropic properties of low-permeability sandstones from a tight gas reservoir. Single-frequency electrical properties were found to be of low value for the determination of permeability for the studied samples, whereas a strong link between the spectral-induced polarization (SIP) response and permeability was found. The SIP response was transformed into a relaxation-time distribution using a Debye decomposition procedure. We observed a strong positive correlation in form of a power law between median relaxation time of the distribution and permeability, suggesting that relaxation time is a good measure of the effective hydraulic length scale. From a ...