In situ stress field and permeable fractures in the Akinomiya Geothermal Field, Japan

T. Okabe, H. Nakata, T. Kajiwara, Kazuo Hayashi, S. Yokomoto, S. Miyazaki

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

In the course of the Geothermal Development Promotion Survey Projects of NEDO (the New Energy and Industrial Technology Development Organization of Japan), eight wells have been drilled in the Akinomiya geothermal field in northern Japan. Formation microimaging (FMI) logs were conducted at all of the wells and drilling-induced tensile fracture (DTF) were observed at seven wells. The objective of the present paper is to analyze the DTF data obtained from the boreholes in order to estimate stress fields and to interpret permeable fractures based on the stress fields. An inversion technique estimates the stress fields. The estimated stress fields in the Pre-Tertiary basement rock yielded a normal faulting stress regime. However, the stress fields in the Torageyama formation and in the boundary between the Torageyama formation and the Pre-Tertiary basement rock yielded a reverse faulting stress regime.

Original languageEnglish
Title of host publicationAnnu. Geotherm. Resources Counc. Mtg. (Reno, NV, 9/22-25/2002) Trans.
Pages237-243
Number of pages7
Publication statusPublished - 2002 Dec 1

Publication series

NameAnnu. Geotherm. Resources Counc. Mtg. (Reno, NV, 9/22-25/2002) Trans.
Volume26
ISSN (Print)0193-5933

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics

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