2D Characterization of Geometric Features and Connectivity of Fracture Networks in Shale Formations
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摘要: 节理、裂缝等弱结构面非常发育是页岩地层的基本结构特征，裂缝网络的有效沟通可以增大压裂改造体积，正确认识和描述裂缝网络形态及连通性对合理有效开发页岩油气藏具有十分重要的意义。为准确描述页岩天然裂缝网络几何特征二维表征及其连通性，以分形几何和拓扑几何为理论依据，建立了页岩裂缝组裂缝尺寸、裂缝数量的分形描述模型，给出了裂缝网络连通节点类型、分支数、裂缝平均连通点数和分支平均连通点数等的计算模型，并对裂缝网络连通性进行了二维模拟，分析了分形维数、裂缝组数和裂缝组交角对裂缝网络连通性的影响。研究发现：天然裂缝分布的数量与发育程度受分形维数、组数和初始数量控制，随分形维数增大而增大；在其他参数不变的条件下，裂缝平均连通性和分支平均连通性对分形维数、裂缝组数、裂缝组交角等参数敏感，随分形维数的增大呈现降低趋势，随裂缝组数增加而升高，随裂缝组交角增大而升高。该研究结果可为合理制定页岩储层开发方案提供理论支撑。Abstract: Joints,fractures and other weak structural planes can be identified as the fundamental structural features of shale formations.Since effective communication among fractural networks can effectively enhance fractured reservoir volume,the understanding and description of configurations and connectivity of fracture network are of great importance for high-efficiency development of shale oil/gas reservoirs.To obtain accurate representations of the the geometric features,2D characterization and connectivity of natural fracture networks in shale,the fractural geometry and topologic geometry are used as a theoretical foundation to construct a fractural description model for fractural sizes and quantity in shale.In this way,calculation models for fracture node type,number of branches,average connectivity of fractures can be established.In addition,2D simulations have been performed for fracture network connectivity to highlight impacts of fracture dimension,fracture groups and angles to connectivity of fracture network.Research results showed that the quantity and development of natural fractures are subject to fractural dimensions,groups and initial quantity.Generally speaking,natural fractures increase with an increase in fractal dimensions.With other parameters remain unchanged,the average connectivity of fractures and branches is sensitive to fractal dimensions,fracture groups,fracture angles and other parameters.The connectivity may decrease with the increase in fractal dimensions and may increase with the increase in groups and angles.Relevant research results may provide theoretical foundation programs making in shale reservoirs development.
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Keywords:
- shale formation /
- natural fracture /
- fracture network /
- network connectivity /
- fractal geometry
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[1] 郭印同,杨春和,贾长贵,等.页岩水力压裂物理模拟与裂缝表征方法研究[J].岩石力学与工程学报,2014,33(1):52-59. GUO Yintong,YANG Chunhe,JIA Changgui,et al.Research on hydraulic fracturing physical simulation of shale and fracture characterization methods[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(1):52-59. [2] 李雪.裂缝性油气藏储层综合表征体系综述[J].中国科技论文,2015,10(15):1861-1870. LI Xue.A review on comprehensive characteristics of fractured reservoirs[J].China Sciencepaper,2015,10(15):1861-1870. [3] 周亚楠,邓媛,霍威,等.油气储层裂缝描述综述[J].辽宁化工,2012,41(10):1008-1011. ZHOU Yanan,DENG Yuan,HUO Wei,et al.An overview of fracture description for oil and gas reservoirs[J].Liaoning Chemical Industry,2012,41(10):1008-1011. [4] 邬光辉,岳国林,师骏,等.塔中奥陶系碳酸盐岩裂缝连通性分析及其意义[J].中国西部油气地质,2006,2(2):156-159. WU Guanghui,YUE Guolin,SHI Jun,et al.Analysis of connectivity of fractures of ordovician carbonates and its implication in Central Tarim Basin[J].West China Petroleum Geosciences,2006,2(2):156-159. [5] 施泽进,涂涛.裂隙连通性研究的重正化群方法:以一个二维裂隙模型为例[J].成都理工学院学报,1997,24(3):58-63. SHI Zejin,TU Tao.The renormalization group approach applied to study of crack conduction:taking a two-dimensional crack model as an example[J].Journal of Chengdu University of Technology,1997,24(3):58-63. [6] OZKAYA S I,MATTNER J.Fracture connectivity from fracture intersections in borehole image logs[J].Computers Geosciences,2003,29(2):143-153.
[7] 王香增,万永平.油气储层裂缝定量描述及其地质意义[J].地质通报,2008,27(11):1939-1942. WANG Xiangzeng,WAN Yongping.Quantitative characterization of fracture in reservoir and its geological significance[J]. Geological Bulletin of China,2008,27(11):1939-1942. [8] GHOSH K,MITRA S.Structural controls of fracture orientations,intensity,and connectivity,Teton anticline,Sawtooth Range,Montana[J].AAPG Bulletin,2009,93(8):995-1014.
[9] 鞠玮,侯贵廷,潘文庆,等.塔中Ⅰ号断裂带北段构造裂缝面密度与分形统计[J].地学前缘,2011,18(3):317-323. JU Wei,HOU Guiting,PAN Wenqing,et al.The density and fractals of structural fractures in northern segment of Tazhong No.1 Fault,Xinjiang,China[J].Earth Science Frontiers,2011,18(3):317-323. [10] RUBINO J G,GUARRACINO L,MUELLER T M.Do seismic waves sense fracture connectivity?[J].Geophysical Research Letters,2013,40(4):692-696.
[11] 郭天魁,张士诚,葛洪魁.评价页岩压裂形成缝网能力的新方法[J].岩土力学,2013,34(4):947-954. GUO Tiankui,ZHANG Shicheng,GE Hongkui.A new method for evaluating ability of forming fracture network in shale reservoir[J].Rock and Soil Mechanics,2013,34(4):947-954. [12] CLEMO T,SMITH L.A hierarchical model for solute transport in fractured media[J].Water Resources Research,1997,33(8):1763-1784.
[13] 衡帅,杨春和,曾义金,等.页岩水力压裂裂缝形态的试验研究[J].岩土工程学报,2014,36(7):1243-1251. HENG Shuai,YANG Chunhe,ZENG Yijin,et al.Experimental study on hydraulic fracture geometry of shale[J].Chinese Journal of Geotechnical Engineering,2014,36(7):1243-1251. [14] 巩磊,曾联波,苗凤彬,等.分形几何方法在复杂裂缝系统描述中的应用[J].湖南科技大学学报(自然科学版),2012,27(4):6-10. GONG Lei,ZENG Lianbo,MIAO Fengbin,et al.Application of fractal geometry on the description of complex fracture systems[J].Journal of Hunan University of Science Technology(Natural Science Edition),2012,27(4):6-10. [15] 李玮,闫铁.二维条件下天然裂缝对压裂裂缝影响的分形分析[J].特种油气藏,2013,20(1):67-70. LI Wei,YAN Tie.Fractal analysis of the influence of natural fractures under 2D conditions on the fracturing fractures[J].Special Oil Gas Reservoirs,2013,20(1):67-70. [16] 孙骏.利用分形方法研究裂缝面形貌特征[D].成都:成都理工大学,2015. SUN Jun.Study of fracture surface morphology characteristics by using fractal method[D].Chengdu:Chengdu University of Technology,2015. -
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