Variations in the physical and mechanical properties of rocks from different depths in the Songliao Basin under uniaxial
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ORIGINAL ARTICLE
Variations in the physical and mechanical properties of rocks from different depths in the Songliao Basin under uniaxial compression conditions Yiqiang Lu . Cong Li . Zhiqiang He . Mingzhong Gao . Ru Zhang . Cunbao Li . Heping Xie
Received: 27 January 2020 / Accepted: 4 May 2020 Springer Nature Switzerland AG 2020
Abstract With the development of deep energy resources, understanding variations in the physical and mechanical properties of rocks at different depths is significant. In this paper, core samples from ten different burial depths (1000 m, 1300 m, 1600 m, 1850 m, 2600 m, 3500 m, 4800 m, 5100 m, 5600 m, and 6400 m) were collected from the Songke No. 2 (SK-2) well and the Daqing Oilfield. To the best of our knowledge, this is the first study involving the physical property and uniaxial compression testing of rock cores from such a large range of burial depths. The experimental results show that the content of weak phase minerals decreases with increasing depth. The change in the hard phase minerals varies nonlinearly
Y. Lu M. Gao C. Li (&) H. Xie (&) Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 51806, China e-mail: [email protected] H. Xie e-mail: [email protected] Y. Lu M. Gao C. Li H. Xie Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy, Shenzhen University, Shenzhen 518060, China Y. Lu C. Li Z. He M. Gao R. Zhang MOE Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065, China
with depth. From 3500 to 5600 m, the content of hard phase minerals decreases, while the content of the middle phase minerals increases. The elastic modulus exponentially increases with increasing depth, while Poisson’s ratio decreases with increasing depth. Additionally, the uniaxial compressive strength displays a nonlinear logarithmic increase with increasing depth. Finally, the effects of petrophysical properties on the mechanical behavior of rock at different depths are discussed. The elastic modulus, Poisson’s ratio, and compressive strength all have a negative correlation with the content of weak phase minerals. These results have important value for studying the mechanics of rocks at different depths. Keywords Deep rocks Different depths Physical properties Mechanical properties Uniaxial compression
1 Introduction With the depletion of shallow resources, the exploitation of geothermal, oil and gas, coal, metal and other resources gradually deepens, bringing deep rock mechanics problems to the attention of international scholars (Xie et al. 2020; Zhang and Zhao 2020). Deep rock has an in situ geological conditions characterized by high geostress, high temperature and high osmotic pressure, which is different from the in situ
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Geomech. Geophys. Geo-energ. Geo-resour. (2020)6:43
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