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《Chinese Science Bulletin》 2016-01
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3D reconstruction of low-permeability heterogeneous glutenites and numerical simulation of hydraulic fracturing behavior

JU Yang;YANG Yong Ming;CHEN Jia Liang;LIU Peng;DAI Tao;GUO Ying Chun;ZHENG Lian Ge;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology;Earth Sciences Division,Lawrence Berkeley National Laboratory;School of Mechanics and Civil Engineering,China University of Mining and Technology;Geological Scientific Research Institute,SINOPEC Shengli Oilfield Company;  
Based on microfocus computed tomography(?CT) imaging and X-ray diffraction techniques,a three-dimensional(3D) reconstruction model for heterogeneous glutenites was established by taking into account the mineral compositions and distribution characteristics of gravel particles.We employed the continuum-based discrete element method(CDEM) to simulate and analyze the initiation and propagation behavior of hydrofracturing cracks of heterogeneous glutenites subjected to various horizontal geostresses.The influences of various horizontal stress ratios and the characteristics of gravel particles on the initiation,growth,geometry,and spatial distribution of hydrofracturing cracks in heterogeneous glutenites were evaluated by comparing the properties of fractures with the simulation results of homogeneous sandstones.Additionally,we conducted a series of hydrofracturing experiments with physical models of the heterogeneous glutenites and homogeneous sandstones and compared the experimental data to the simulation results.Findings showed that the heterogeneity of glutenites significantly affects the hydrofracturing crack initiation and growth behavior.For identical geostress,the initiation pressure for hydrofracturing of heterogeneous glutenites was lower than that of homogeneous sandstones.The difference in initiation pressure between the heterogeneous glutenites and homogenous sandstones gradually decreased with an increase in the horizontal stress ratio,but overall,the change in the horizontal stress ratio had little effect on the initiation pressure for hydrofracturing of heterogeneous glutenites.The data from this investigation also indicate that for both heterogeneous glutenites and homogeneous sandstones,changes in the horizontal stress ratio can have an apparent impact on the spatial distribution and morphology of hydrofracturing cracks.
【Fund】: 国家杰出青年科学基金(51125017);; 国家自然科学基金(51374213);; 国家自然科学创新研究群体科学基金(51421003);; 国家重点基础研究发展计划(2011CB201201)资助
【CateGory Index】: TE357.1
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