The Spatial Distribution of Elastic Parameters of Orthotropic Rocks

doi:10.11885/j.issn.1674-5086.2018.09.21.02

Abstract

Abstract: The mechanical parameters of rocks are the basic parameters for studying the wellbore stability and fracturing reformation. Their values can be calculated based on the stiffness matrix. Currently, the models used for calculating the mechanical parameter of rocks based on the stiffness matrix consider the formation as a VTI medium. This approach failed to take into consideration of the significant amount of ORT features in the actual formation and the effect of observation coordinate systems on the mechanical properties of rock. In this study, the expression of the stiffness parameter used for calculating the rock mechanical parameters was derived based on the constitutive equation of rock and considering the ORT features of shale gas formations. First, the expression of the stiffness matrix used for calculating the rock mechanical parameters was derived from the constitutive relation of the rock. Next, by considering the intersection angle between the wellbore and the stratum, combining the definition of mechanical parameters for rock, and performing coordinate transformation, a method for calculating the mechanical parameters of rocks was established in the observation coordinate system. The mechanical parameters of rocks in different observation coordinate systems were also analyzed and compared. Finally, considering that the actual formation is composed of shale-sandstone interbeds, we analyzed the influence of the variation in sandstone content on the mechanical parameters of rock in the observation coordinate system.

Key words: orthotropic, Young's modulus, poisson's ratio, interbed, spatial distribution

CLC Number:

TE132
TE21

GUI Junchuan, CHEN Ping, MA Tianshou. The Spatial Distribution of Elastic Parameters of Orthotropic Rocks[J]. 西南石油大学学报(自然科学版), 2019, 41(3): 13-28.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2018.09.21.02

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