도함수 진단 분석 방법을 활용한 심부 균열암반 수리특성 도출 결과의 신뢰도 제고 방안
Improvement of Hydraulic Properties by Derivative Diagnostic Analysis in Deep Fractured Rock
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
본 보고에서는 심부 균열암반 현지 수리특성 도출결과의 정밀도 향상을 위한 도함수 진단 분석 방법의 개념과 적용 사례들을 수록하였다. 일반적으로 현장 수리시험을 통해 획득한 유량/압력 변화 곡선과 그 원시 자료의 변화율인 도함수 곡선을 적합한 해석모델의 표준곡선에 동시에 매칭하는 방식을 통해 암반 의 대표 수리특성인 수리전도도값을 산출할 수 있다. 또한 도함수 분석을 활용해 시간 경과에 따른 원시 유량/압력 변화 곡선에서는 확인하기 어려운 시험 초반의 수리반응과 이후 흐름 양상의 변환 및 원계 영 역의 수리경계 효과도 판별이 가능하다. 이러한 도함수 진단 분석 방법의 효과적인 사용은 최적의 해석 모델 선정을 용이하게 함으로써 현장 수리시험을 통한 균열암반 수리특성 평가의 신뢰도 제고에 기여할 수 있을 것으로 사료된다.
Abstract
This report presents the concept and application cases of derivative diagnostic analysis methods aimed at improving the precision of hydraulic properties evaluation results in deep fractured rock. Hydraulic conductivity, a representative hydraulic property of rock, can typically be determined by matching both the flow rate/drawdown curve obtained from field hydraulic tests and its derivative curve representing the rate of change of drawdown with the standard curves of an appropriate analytical model. Moreover, derivative analysis facilitates the identification of early hydraulic responses, flow regime transitions, and hydraulic boundary effects within the domain, which are often difficult to discern from conventional flow rate/drawdown curves over time. The effective application of derivative diagnostic analysis enhances the selection of optimal analytical models, thereby contributing to greater reliability in evaluating hydraulic properties of fractured rock through field hydraulic tests.
참고문헌 (22)
- Barker, J. A., "A generalized radial flow model for hydraulic tests in fractured rock", Water Resources Research, 24(10), pp.1796~1804 (1988)
- Beauheim, R. L., "Well testing in fractured media : flow dimensions and diagnostic plots", Journal of Hydraulic Research, 42, pp.69~76 (2004)
- Birsoy, Y. K., "Determination of aquifer parameters from step tests and intermittent pumping data", Ground Water, 18(2), pp.137~146 (1980)
- Bourdet, D., "Use of pressure derivative in well-test interpretation", Society of Petroleum Engineers, 4, pp.293~302 (1989)
- Method evaluation of single hole hydraulic injection tests at site investigations Oskarshamn, "Enachescu, C.", SKB, 103~, pp.SKB P-07-79 (2007)
- Ferroud, A., "Insights on pumping well interpretation from flow dimension analysis : The learnings of a multi-context field database", Journal of Hydrology, 556, pp.449~474 (2018)
- A comparison between standard well test evaluation methods used in SKB’s site investigations and the generalized radial flow concept, "Follin, S.", SKB, 55~, pp.SKB P-06-54 (2011)
- Hamm, S. Y., "Hydrogeological properties of unconsolidated formations and bedrocks in the central area of Busan metropolitan city", The Journal of Engineering Geology, 15(4), pp.407~421 (2005)
- Hantush, M. S., "Nonsteady flow to flow wells in leaky aquifers", Journal of Geophysical Research, 64(8), pp.1043~1052 (1959)
- Hantush, M. S., "Non-steady radial flow in an infinite leaky aquifer", American Geophysical Union Transations, 36(1), pp.95~100 (1955)
- Single-hole injection tests in boreholes KA2051A01, KA3007A01 and KJ0050F01, "Hjerne, C.", SKB, 184~, pp.SKB P-13-24 (2013)
- Hurst, W., "The skin effect in producing wells", Journal of the Society of Petroleum Evaluation Engineers, 1(01) (1968)
- Ishii, E., "Assesment of hydraulic connectivity of fractures in mudstone by single-borehole investigations", Water Resources Research, 54(5), pp.3335~3356 (2018)
- Kim, B. S., "Estimation of hydraulic parameters of a fractured rock aquifer using derivative analysis", Journal of Soil and Groundwater Environment, 15(6), pp.46~52 (2010)
- Kim, K. Y., "Hydraulic analysis of fractured rock aquifer using a simplified model based on aquifer test", Journal of the Geological Society of Korea, 39(3), pp.359~370 (2003)
- Lee, H., "Evaluation of hydrogeological characteristics of deep-depth rock aquifer in volcanic rock area", Tunnel and Underground Space, 34(3), pp.231~247 (2024)
- Method evaluation of single-hole hydraulic injection tests at site investigations in Forsmark, "Ludvigson, J. E.", SKB, 162~, pp.SKB P-07-80 (2007)
- Renard, P., "Understanding diagnostic plots for well-test interpretation", Hydrogeology Journal, 17(3), pp.589~600 (2009)
- Spane, F. A. Jr., "Deriv : A computer program for calculating pressure derivatives for use in hydraulic test analysis", Ground Water, 31(5), pp.814~822 (1993)
- Theis, C. V., ", The relation between the lowering of the piezometric surface and the rate and duration of discharge of a well using groundwater storage", Transactions American Geophysical Union, 16(2), pp.519~524 (1935)
- Veneruso, A. F., "A digital pressure derivative technique for pressure transient well testing and reservoir characterization", Paper presented at the 2006 SPE Annual Technical Conference and Exhibition, pp.24~27 (2006)
- Yang, C. F., "Application of seismically derived tilt signals to characterize groundwater flow regimes : An example from a constant-rate pumping test in Taiwan", Journal of Hydrology, 645, pp.132188~ (2024)