Title:
TECTONIC STRESS MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2018/123269
Kind Code:
A1
Abstract:
In the present invention, from the shape of a measurement cross-section, which is set in a direction orthogonal to the longitudinal direction, of a boring core (BC1) acquired by excavating crust or ground in the excavation direction of a well (1), the following are measured: the length of the measurement cross-section diameter (Dmax) where the strain amount with respect to a reference circle diameter is largest; and the length of the diameter (Dmin) where the strain amount with respect to the reference circle diameter is smallest. From the shape of a measurement cross-section, which is set in a direction orthogonal to the longitudinal direction, of a side-wall core (SC1) acquired by excavating ground from the well (1), the following are measured: the length of the vertical-direction diameter (d1|φ=0) of the measurement cross-section; and the length of the horizontal-direction diameter (d1|φ=90). The maximum horizontal stress and the minimum horizontal stress among three-dimensional stress elements are calculated from: a formula representing the differential stress between the maximum horizontal stress and the minimum horizontal stress acting on the ground; and a formula representing the differential stress between horizontal stress orthogonal to the longitudinal direction of the side-wall core (SC1) and vertical stress.
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Inventors:
ITO TAKATOSHI (JP)
TEZUKA KAZUHIKO (JP)
TAMAGAWA TETSUYA (JP)
TEZUKA KAZUHIKO (JP)
TAMAGAWA TETSUYA (JP)
Application Number:
PCT/JP2017/039889
Publication Date:
July 05, 2018
Filing Date:
November 06, 2017
Export Citation:
Assignee:
JAPAN PETROLEUM EXPLORATION CO LTD (JP)
UNIV TOHOKU (JP)
UNIV TOHOKU (JP)
International Classes:
G01L5/00; E21B49/02; G01L1/00
Foreign References:
| JP2004125672A | 2004-04-22 | |||
| US4491022A | 1985-01-01 | |||
| US20090133932A1 | 2009-05-28 |
Other References:
FUNATO, AKIO ET AL.: "A new method of diametrical core deformation analysis for in-situ stress measurements", INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, vol. 91, 25 November 2016 (2016-11-25), pages 112 - 118, XP029863456, ISSN: 1365-1609
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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