<b>Changes in Permeability of Kimachi Sandstone and Iidate Granite with Supercritical CO</b><b><sub>2</sub></b><b> Injectio</b><b>n </b>

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  • FUJII Takashi
    Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology
  • SUGAI Yuichi
    Department of Earth Resources Engineering, Kyushu University
  • SASAKI Kyuro
    Department of Earth Resources Engineering, Kyushu University
  • HASHIDA Toshiyuki
    Fracture and Reliability Research Institute, Tohoku University
  • TOSHA Toshiyuki
    Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology
  • NAKAO Shinsuke
    Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology

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Other Title
  • 超臨界CO<sub>2 </sub>注入に伴う来待砂岩および飯館花崗岩の浸透率の変化
  • 超臨界CO₂注入に伴う来待砂岩および飯館花崗岩の浸透率の変化
  • チョウリンカイ CO ₂ チュウニュウ ニ トモナウ キマチ サガン オヨビ イイダテ カコウガン ノ シントウリツ ノ ヘンカ
  • Changes in Permeability of Kimachi Sandstone and Iidate Granite with Supercritical CO2 Injection

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Abstract

Understanding of interfacial interactions among supercritical CO2 (scCO2), water, and mineral phase is necessary for a precisely prediction of CO2 migration into aquifers. The purpose of this study is to assess the impact of scCO2 on flow property of Kimachi sandstone and Iidate granite in a CO2 rich dense phase i.e., the condition of which scCO2 is expected to displace formation water in the course of CO2 injection. In this experiment, the permeability test for CO2 gas was conducted before and after a CO2 saturation procedure that is filled with scCO2 in pores of rocks. To investigate a mechanical property of rock specimen in the presence of scCO2, the axial strain was also measured using a laser displacement sensor during scCO2 saturation processes. Our results showed that both Kimachi sandstone and Iidate granite samples tested have a more or less decreasing trend of gas permeability with increasing exposure time to scCO2. It was further shown that the axial strain of Kimachi sandstone and Iidate granite increased as scCO2-exposure time increased. Additionally, increases in masses and dimensions of test samples before and after scCO2 saturation processes were clearly observed under atmospheric pressure conditions. It can, therefore be said that Kimachi sandstone and Iidate granite could be capable of swelling and permeability change accompanied by CO2 sorption into their internal structures in the presence of scCO2. Furthermore, the observed significant reduction in permeability cannot fully be explained by two model predictions based on Kozeney-Carman equation and Hagen-Poiseuille law, considering CO2 sorption onto mineral phases. The present results pointed out that CO2 sorption on rocks under geological CO2 storage conditions could have a significantly impact on flow property of rocks during CO2 injection and storage processes.

Journal

  • Journal of MMIJ

    Journal of MMIJ 129 (12), 701-706, 2013

    The Mining and Materials Processing Institute of Japan

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