X-ray CT based numerical analysis for fluid flows through vuggy carbonate cores

Hikaru Kusanagi, Noriaki Watanabe, Takashi Shimazu, Masahiko Yagi, Takeshi Komai, Noriyoshi Tsuchiya

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

Whole core analysis, which provides characteristics on a larger scale closer to that of the reservoir, is particularly important for heterogeneous formations such as vuggy carbonate or fractured rocks. Consequently, the authors previously developed an X-ray CT based method to numerically analyze fluid flows through fractured rock cores. This method provides a 3D fracture aperture distribution of a fractured rock, which can be utilized to analyze fluid flow within the rock, with a local cubic law-based fracture flow model simulation. The numerical models of fractured rock and fluid flow, respectively, can reproduce experimentally determined porosity and permeability, and therefore can provide realistic fracture flow characteristics. In the present study, a new X-ray CT based method to numerically analyze fluid flows through vuggy carbonate rock cores has been developed, and has been applied to different types of vuggy carbonate rock core samples. 3D distributions of CT number of the samples, which consists of 0.4-mm cubic voxels, are converted into 3D porosity distributions, using the partial volume effect (i.e., a linear relationship between CT number and porosity). The porosity distributions can reproduce experimentally determined porosities within factors of approximately 1.1-1.4. To simulate Darcy flow in the samples, 3D permeability distributions are obtained by assuming that the permeability-porosity relation of non-vuggy carbonate rocks is valid locally within a vuggy carbonate rock. As a result of a fluid flow simulation, experimentally determined permeabilities, which show large differences among the samples, are reproduced within factors of 1.6-3.6, and heterogeneous fluid flows (i.e, channeling flows) within the samples.

Original languageEnglish
Publication statusPublished - 2014 Jan 1
Event20th Formation Evaluation Symposium of Japan 2014 - Chiba, Japan
Duration: 2014 Oct 12014 Oct 2

Other

Other20th Formation Evaluation Symposium of Japan 2014
CountryJapan
CityChiba
Period14/10/114/10/2

ASJC Scopus subject areas

  • Geology
  • Energy Engineering and Power Technology
  • Economic Geology
  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

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    Kusanagi, H., Watanabe, N., Shimazu, T., Yagi, M., Komai, T., & Tsuchiya, N. (2014). X-ray CT based numerical analysis for fluid flows through vuggy carbonate cores. Paper presented at 20th Formation Evaluation Symposium of Japan 2014, Chiba, Japan.