“…Concerned about the above research status at home and abroad, the following three aspects of problems could be referred (Xing et al, 2014; You and Su, 2003; Du et al., 2015; Ghassemi, 2012; Kukudzhanov, 2011; Kurek et al., 2011; Markides and Kourkoulis, 2012; Menéndez and David, 2007; Turner, 2013): - Most of the sampling methods in rock measurements are sampled from a certain single direction, which is not from three directions of X, Y, and Z.
- Little measurements are based on synchronous measurement on structure of the reservoir rock, composition and so on, thus the factors that influence anisotropy of mechanical properties in rock mass are relatively poor.
- At present, most of the research and experiments are based on the determination of dry samples, or just loading one or two conditions like the confining pressure, pore pressure, temperature and fluid, etc. Little measurements were designed under specific underground reservoir conditions of temperature, confining pressure, pore pressure, the determination of oil–water saturation, and so the results of most experiments could not reflect reservoir accurately.
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