首页|Impact of effective stress on permeability for carbonate fractured-vuggy rocks

Impact of effective stress on permeability for carbonate fractured-vuggy rocks

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To gain insight into the flow mechanisms and stress sensitivity for fractured-vuggy reservoirs,several core models with different structural characteristics were designed and fabricated to investigate the impact of effective stress on permeability for carbonate fractured-vuggy rocks(CFVR).It shows that the permeability performance curves under different pore and confining pressures(i.e.altered stress con-ditions)for the fractured core models and the vuggy core models have similar change patterns.The ranges of permeability variation are significantly wider at high pore pressures,indicating that perme-ability reduction is the most significant during the early stage of development for fractured-vuggy reservoirs.Since each obtained effective stress coefficient for permeability(ESCP)varies with the changes in confining pressure and pore pressure,the effective stresses for permeability of four repre-sentative CFVR show obvious nonlinear characteristics,and the variation ranges of ESCP are all between 0 and 1.Meanwhile,a comprehensive ESCP mathematical model considering triple media,including matrix pores,fractures,and dissolved vugs,was proposed.It is proved theoretically that the ESCP of CFVR generally varies between 0 and 1.Additionally,the regression results showed that the power model ranked highest among the four empirical models mainly applied in stress sensitivity characterization,followed by the logarithmic model,exponential model,and binomial model.The concept of"perme-ability decline rate"was introduced to better evaluate the stress sensitivity performance for CFVR,in which the one-fracture rock is the strongest,followed by the fracture-vug rock and two-horizontal-fracture rock;the through-hole rock is the weakest.In general,this study provides a theoretical basis to guide the design of development and adjustment programs for carbonate fractured-vuggy reservoirs.

Effective stressPermeabilityCarbonate fractured-vuggy rocksStructure characteristicsStress sensitivity

Ke Sun、Huiqing Liu、Juliana Y.Leung、Jing Wang、Yabin Feng、Renjie Liu、Zhijiang Kang、Yun Zhang

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State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing,102249,China

School of Mining & Petroleum Engineering,University of Alberta,Edmonton,T6G 1H9,Canada

SINOPEC Petroleum Exploration and Production Research Institute,Beijing,100083,China

Joint Fund of NSFC for Enterprise Innovation and DevelopmentNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu ProvinceChina Scholarship Council(CSC)during a visit of Ke Sun

U19B6003-02-0651974331BK20200525202106440065

2024

10.1016/j.jrmge.2023.04.007

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(3)
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