Rock physics experiment and rock physical modeling of hot dry rock under high temperature
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摘要: 为探究干热岩储层物性参数随温度变化的规律，本文对青海共和盆地29块干热岩样品进行高温岩石物理实验，分析了样品速度、磁场强度、电阻率等物性参数随温度变化的规律。研究结果表明：①岩石样品随着温度升高，密度逐渐减小，但衰减幅度不足1%；②样品纵横波速度受温度变化的影响较大，在120~180 ℃之间大幅衰减，纵波速度下降约1 500 m/s，横波速度下降约800 m/s；③在120 ℃时，磁场强度达到峰值，数值为室温下的7倍；④电阻率随温度升高呈现波动性变化，数值在10~25 Ω·m范围内变化。基于实验结果，结合经典的Gassmann方程和流体替换模型，定量分析了孔隙度和温度对纵波速度的影响：当孔隙度为0.025时，样品纵波速度随着温度的升高下降约600 m/s，当孔隙度为0.1时，样品纵波速度随着温度的升高下降约1 000 m/s。Abstract: Currently, the investigation and monitoring of geothermal energy face significant challenges, and a lack of understanding regarding the variations in physical parameters of hot dry rock reservoirs with temperature is a crucial factor. In this study, 29 hot dry rock samples from the Gonghe Basin in Qinghai Province were subjected to high-temperature petrophysical experiments to analyze the changing patterns of physical parameters with temperature. Results show that: ①The density of rock samples gradually decreases with temperature, albeit with an attenuation range of less than 1%. ②The temperature change exerts a substantial influence on the P-wave velocity and S-wave velocity of the samples, resulting in significant attenuation between 120 ℃ and 180 ℃, with respective reductions of approximately 1 500 m/s and 800 m/s. ③A peak magnetic field intensity, seven times greater than at room temperature, is reached at 120 ℃. ④The resistivity fluctuates with increasing temperature, whose values ranges from 10 to 25 Ω·m. Based on these experimental results and with the combination of the classical Gassmann equation and fluid substitution models, this study made a quantitative analysis on the impacts of porosity and temperature variations on longitudinal wave velocity. The outcomes indicate that a porosity of 0.025 resulted in a decrease of approximately 600 m/s in the longitudinal wave velocity with increasing temperature, whereas a porosity of 0.1 caused a decrease of approximately 1 000 m/s under the same conditions.
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Key words:
- petrophysics /
- hot dry rocks /
- Qinghai Gonghe Basin /
- high temperature /
- petrophysical modeling
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图 3 干热岩样品横波速度与温度关系
Figure 3. Transverse wave velocity versus temperature for hot dry rock samples
图 4 干热岩样品纵波速度与温度关系
Figure 4. Longitudinal velocity versus temperature for hot dry rock samples
图 5 干热岩样品磁场强度与温度关系
Figure 5. Magnetic field strength versus temperature for hot dry rock samples
图 7 干热岩样品体积模量随温度变化曲线
Figure 7. Variation curve of bulk modulus of hot dry rock samples with temperature
图 8 干热岩样品剪切模量随温度变化曲线
Figure 8. Variation curve of shear modulus with temperature for hot dry rock samples
图 9 不同孔隙度岩石横波速度随温度变化曲线
Figure 9. Fluid replacement rock transverse wave velocity volume variation curve with temperature
图 10 不同孔隙度岩石纵波速度随温度变化曲线
Figure 10. Variation of rock longitudinal velocity with temperature after fluid replacement
表 1 实验编号与试样编号对照表
Table 1. Comparison table between test number and sample number
实验编号 1 2 3 4 5 6 7 8 9 10 试样编号 砂岩1 砂岩2 20-19，1-2 20-19，1-，1 地表 2 沟后1 沟后1(2) 1井 2井 2井2 实验编号 11 12 13 14 15 16 17 18 19 20 试样编号 3井2 4井 4井2 5井1 5井2 沟后5 沟后5(2) 6井1 6井1(2) 6井2 实验编号 21 22 23 24 25 26 27 28 29 试样编号 沟后6 沟后6(2) 7井1 7井1(2) 7井2 7井2(2) 7井3 7井3(2) 3井1 
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