Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO 2 storage studies
Characterisation and multifaceted anisotropy assessment of Corvio sandstone for geological CO 2 storage studies
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用于 CO 2 地质封存研究的 Corvio 砂岩的表征和多方面各向异性评估
DOI：
10.1111/1365-2478.12469
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发表时间：
2016
影响因子：
2.6
通讯作者：
Falcon-Suarez I
中科院分区：
文献类型：
--
作者：
Falcon-Suarez I
我们提出了一个全面的表征的物理，矿物学，地质力学，地球物理和流体动力学特性的科尔维奥砂岩。需要这些信息以及各向异性的详细评估，将Corvio砂岩建立为有用的实验室岩石测试标准，用于与CO2储存实践相关的热-水力-机械-化学耦合现象的良好约束研究以及一般地质储层研究。本表征研究中使用了200多个Corvio砂岩岩心塞（直径38.1和50 mm，长径比2：1），岩石孔隙度为21.7 ± 1.2%，干密度为2036 ± 32 kg m−3，无侧限抗压强度和抗拉强度分别为41 ± 3.28和2.3 ± 0.14 MPa。地质力学试验表明，岩石在无侧限条件下的弹性模量为11.8 ± 2.8GPa，泊松比为0.34 ± 0.01GPa，弹性模量在100 ~ 180 MPa之间。渗透率随围压的增加而急剧下降，最高可达0.10 MPa，然后稳定在0.1mD。在0.1至35 MPa的围压和压差范围内，超声波P波和S波速度分别在2.8-3.8 km s-1和1.5-2.4 km s-1之间变化，从而可以推导出相关的动态弹性模量。各向异性进行了研究，电阻率，弹性波的速度和衰减，渗透率，示踪剂注入测试使用定向芯塞。Corvio砂岩表现出弱的横向各向同性（对称轴垂直于层理），速度<10%，衰减<20%。
We present a comprehensive characterisation of the physical, mineralogical, geomechanical, geophysical, and hydrodynamic properties of Corvio sandstone. This information, together with a detailed assessment of anisotropy, is needed to establish Corvio sandstone as a useful laboratory rock‐testing standard for well‐constrained studies of thermo–hydro–mechanical–chemical coupled phenomena associated with CO2 storage practices and for geological reservoir studies in general. More than 200 core plugs of Corvio sandstone (38.1 and 50 mm diameters, 2:1 length‐to‐diameter ratio) were used in this characterisation study, with a rock porosity of 21.7 ± 1.2%, dry density 2036 ± 32 kg m−3, and unconfined compressive and tensile strengths of 41 ± 3.28 and 2.3 ± 0.14 MPa, respectively. Geomechanical tests show that the rock behaves elastically between ∼10 and ∼18 MPa under unconfined conditions with associated Young's modulus and Poisson's ratio of 11.8 ± 2.8 GPa and 0.34 ± 0.01 GPa, respectively. Permeability abruptly decreases with confining pressure up to ∼10 MPa and then stabilises at ∼1 mD. Ultrasonic P‐ and S‐wave velocities vary from about 2.8–3.8 km s−1 and 1.5–2.4 km s−1, respectively, over confining and differential pressures between 0.1 and 35 MPa, allowing derivation of associated dynamic elastic moduli. Anisotropy was investigated using oriented core plugs for electrical resistivity, elastic wave velocity and attenuation, permeability, and tracer injection tests. Corvio sandstone shows weak transverse isotropy (symmetry axis normal to bedding) of <10% for velocity and <20% for attenuation.