Electrical resistivity measurements of rocks under confining pressure condition

• Hatakeda Kentaro

  Marine Works Japan Ltd.

• Lin Weiren

  Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Graduate School of Engineering, Kyoto University

• Hirose Takehiro

  Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

• Tanikawa Wataru

  Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

• Hamada Yohei

  Marine Works Japan Ltd.

• Tadai Osamu

  Marine Works Japan Ltd.

Bibliographic Information

Other Title

• 封圧下における岩石試料の比抵抗測定に関する研究

Abstract

Laboratory experiment of electrical resistivity measurement under in situ pressure and temperature conditions is essential to precisely interpret the DC resistivity and electro-magnetic survey and logging data. We constructed a resistivity measurement system under confining and pore pressure control, and examined the pressure dependence of electrical resistivity of rocks. Electrical resistivity of four sandstone and two igneous rock samples saturated with 35 g/L NaCl solution were measured under different effective pressure conditions (maximum 80 MPa with pore pressure of 1 MPa). We also estimated geometric change of pore space by measuring the drained pore water volume under confining pressure. The result showed that pore water in all the samples were drained with increasing pressure, and at the same time resistivity were increased. Resistivity changes of sandstone samples were highly correlated with changes of pore water volume, which directly indicates the strong relationship between resistivity increase and closure of pore space under pressure condition. Pressure dependence of resistivity was different among the rock types. Rapid increase of resistivity at low confining pressure (～10 MPa) might be caused by closure of microcracks in igneous rocks. Resistivity changes of sandstone samples possibly depended on the shape and size distribution of pores, and their deformation characteristics.

Journal

• JAMSTEC Report of Research and Development

  JAMSTEC Report of Research and Development 24 (0), 1-9, 2017

  Japan Agency for Marine-Earth Science and Technology

Keywords

• Electrical resistivity
• confining pressure
• four-electrode method

Details

• CRID: 1390282680293415808
• NII Article ID: 130005519986
• DOI: 10.5918/jamstecr.24.1
• ISSN: 2186358X
• ISSN: 18801153
• HANDLE: 2433/226978
• Web Site: https://www.jstage.jst.go.jp/article/jamstecr/24/0/24_1/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed