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http://dx.doi.org/10.7582/GGE.2017.20.4.207

Differential Horizontal Stress Ratio for Danyang Limestone with Vertical Transversely Isotropy  

Jang, Seonghyung (Korea Institute of Geoscience and Mineral Resources, Petroleum and Marine Division)
Hwang, Seho (Korea Institute of Geoscience and Mineral Resources, Geological Environment Division)
Shin, Jehyun (Korea Institute of Geoscience and Mineral Resources, Geological Environment Division)
Kim, Tae Youn (Korea Institute of Geoscience and Mineral Resources, Petroleum and Marine Division)
Publication Information
Geophysics and Geophysical Exploration / v.20, no.4, 2017 , pp. 207-215 More about this Journal
Abstract
To develope shale play which is one of unconventional energy resources, horizontal drilling and hydraulic fracturing are necessary and those are applied to the place where the differential horizontal stress ratio (DHSR) is low. The differential horizontal stress ratio is generally calculated by the minimum and maximum horizontal stress, but it is also calculated from dynamic elastic constants and anisotropic parameters. In this study we analyzed anisotropic properties through the core samples from Danyang limestone and calculated DHSR. The three types of core samples shaped in three directions (vertical, parallel and 45 degree to bedding) were used for laboratory test. We measured P-, S-wave velocities, and density and then calculated dynamic elastic constants, compliance and DHSR. According to the results of the core sample analysis the calculated DHSR is 0.185. Thomsen parameters of the Danyang limestone used in this study are characterized by the P- and S-wave velocities varying along the bedding symmetry axis. It is observed that the DHSR value is more affected by the change in compliance value than the Poisson's ratio. It is necessary to measure SH-wave velocity for more correct petrophysical properties.
Keywords
differential horizontal stress ratio (DHSR); dynamic elastic constants; compliance; Danyang Limestone; laboratory core test;
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