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논문 기본 정보

자료유형
학술저널
저자정보
Ju Hyeon Yu (Korea Institute of Geoscience and Minera) 최준형 (동아대학교) Young Jae Shinn (Korea Institute of Geoscience and Minera) Dae Sung Lee (Dong-A University)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.20 No.4
발행연도
2016.1
수록면
551 - 559 (9page)

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Permeability is one of the important rock properties in oil and gas exploration as essential input data of reservoir characterization and production simulation. As production of unconventional resources such as tight gas/oil, shale gas and coal bed methane increases, there is a growing need to measure the permeability of tight formation rocks. Direct measurement by conventional steady-state flow methods, however, is limited due the length of time needed for pressure equilibration. In this study the pressure pulsedecay method is applied to measure low permeability (lower than 9.87E-18m2) rocks. This method is based on the analysis of unsteadystate gas flow. The dissipation rates of dimensionless differential pressure (ΔPD) with time indicates permeability of various core samples. The low permeability measured by using the pressure pulse-decay method, is compared with the permeability recovered from the steady-state method for validation. These low permeability measurements are conducted to six tight sandstones from the Gyeongsang and Janggi basins, South Korea and Tsushima Island, Japan. The apparent permeability measured by the pressure pulsedecay method was approximately twice higher than permeability measured by steady-state method. By comparing the relationship between permeability and mean pressure, this may result from gas slippage effects.

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