筇竹寺组和龙马溪组页岩弹性与复电阻率特性研究

为研究下寒武统筇竹寺组和下志留统龙马溪组页岩弹性与复电阻率特性，采集了川南、鄂西和渝东地区露头岩样标本。 基于 AutoScan-Ⅱ 多参数测试平台，进行了单点测试及平面扫描。 实验结果表明：筇竹寺组页岩纵横波速度与渗透率呈负相关关系，杨氏模量与泊松比符合远景页岩标准，可压性强。 龙马溪组页岩复电阻率 4 项参数的值随矿化度的升高均不同程度地减小，但对频散曲线形态影响较小；相角和异相电阻率在频率为 10 kHz 内与该频点上复电阻率幅值频散曲线的斜率呈正相关关系；对不同采样点岩样频散特性进行对比，认为黄铁矿颗粒的激发极化作用是重庆石柱地区页岩相角与异相电阻率大幅度频散的主要因素，黄铁矿是有机质富存的特征之一，因此异相电阻率与相角可作为复电阻率测井中探测龙马溪组富含有机质页岩层系的重要参数。

Elastic and electrical properties of shales from Qiongzhusi and Longmaxi Formation

In order to study the elastic properties and complex resistivity of shale of Lower Cambrian Qiongzhusi Formation and Lower Silurian Longmaxi Formation in Sichuan Basin, crop samples were collected from southern Sichuan Basin,western Hubei and eastern Chongqing. Based on AutoScan-Ⅱ platform, planar scanning was conducted to shale samples to obtain the petrophysical parameters such as permeability and velocity. The result shows that the velocities of p-wave and S-wave are negatively correlated with permeability, and Young ’ s modulus and Poisson ’ s ratio are in line with shale standards, with strong compressibility. The values of four parameters of complex resistivity of shale in Longmaxi Formation decreased with the ascending of salinity in different degrees, but have less influence on dispersion curve. When the frequency is less than 10 kHz, phase angle and heterogeneous resistivity have a positive correlation with the slope of amplitude dispersion curve of complex resistivity. Through the comparison of dispersion property of different samples, it is considered that polarization effect of pyrite particles is the main factors for significant dispersion of heterogeneousresistivity and phase angle in Shizhu area of Chongqing. Because pyrite is the sign of rich organic matters, phase angle and hetero-geneous resistivity can be used as important indicators to detect target in Lower Silurian Longmaxi Formation.