应用DFN方法建立下寺湾地区长7陆相页岩气藏裂缝模型
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摘要
目前,页岩气藏的数值模拟主要采用等效连续模型,但陆相页岩气藏的裂缝具有强非均质性,等效连续模型对裂缝非均质性过度简化,不再适用于陆相页岩气藏;为了实现陆相页岩气藏天然裂缝系统的模拟,采用离散裂缝网络(DFN)建模方法建立陆相页岩气藏天然裂缝模型。通过岩心描述、成像测井分析、常规测井分析得到裂缝信息,并与DFN随机建模方法有机结合,建立可靠的裂缝模型;裂缝方位采用多峰分布函数模拟,裂缝大小(长度、开度)采用分数维与裂缝大小的函数模拟;在此基础上,通过裂缝密度的约束来建立页岩气藏离散裂缝网络模型,并以鄂尔多斯盆地中生界延长组长7张家滩泥页岩为研究对象,建立泥页岩裂缝系统的离散裂缝网络模型。采用微地震资料对所建DFN模型进行检验,证实所建立的DFN模型符合真实泥页岩天然裂缝系统。
At present,the numerical simulation of shale gas reservoir mainly adopts equivalent continuum model,but the continental shale gas reservoir fracture with strong heterogeneity,and equivalent continuous model is oversimplify for cracks heterogeneity,which is no longer adapted to the continental shale gas reservoir. In order to achieve the natural fracture system simulation of continental shale gas reservoir,discrete fracture network( DFN) modeling method is adopted to establish the continental shale gas reservoir natural fracture model. Through imaging analysis of core description,logging analysis,conventional well logging analysis,we get the cracks information,and combine with the DFN stochastic modeling method,the crack model,to establish a reliable fracture modeling; fracture orientation adopted the multi- peak distribution function,crack size( length,opening) is established by the function of fractal dimension and crack size,on this basis,through the constraints of fracture strength to establish discrete fracture network model of shale gas reservoir. Setting the ordos basin Mesozoic Chang 7 Zhangjiatang shale as the research object,discrete fracture network model for shale fracture system is established. Micro- seismic data is applied to test the built DFN model,and it was confirmed that the built DFN model is in line with the real shale natural fracture systems.
At present,the numerical simulation of shale gas reservoir mainly adopts equivalent continuum model,but the continental shale gas reservoir fracture with strong heterogeneity,and equivalent continuous model is oversimplify for cracks heterogeneity,which is no longer adapted to the continental shale gas reservoir. In order to achieve the natural fracture system simulation of continental shale gas reservoir,discrete fracture network( DFN) modeling method is adopted to establish the continental shale gas reservoir natural fracture model. Through imaging analysis of core description,logging analysis,conventional well logging analysis,we get the cracks information,and combine with the DFN stochastic modeling method,the crack model,to establish a reliable fracture modeling; fracture orientation adopted the multi- peak distribution function,crack size( length,opening) is established by the function of fractal dimension and crack size,on this basis,through the constraints of fracture strength to establish discrete fracture network model of shale gas reservoir. Setting the ordos basin Mesozoic Chang 7 Zhangjiatang shale as the research object,discrete fracture network model for shale fracture system is established. Micro- seismic data is applied to test the built DFN model,and it was confirmed that the built DFN model is in line with the real shale natural fracture systems.
引文
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[2]徐维胜,龚彬,何川,等.基于离散裂缝网络模型的储层裂缝建模[J].大庆石油学院学报,2011,35(3):13-14.
[3]Nam H T,Chen Zhixi,Sheik S R.Integrated conditional global optimisation for discrete fracture network modeling[J].Computers&Geosciences,2006,32(3):17-27.
[4]宋晓晨,徐卫亚.裂隙岩体渗流模拟的三维离散裂隙网络数值模型[J].岩石力学与工程学报,2004,23(12):2015-2020.
[5]于青春,薛果夫,陈德基.裂隙岩体一般块体理论[M].北京:中国水利水电出版社,2006.
[6]郑松青,姚志良.离散裂缝网络随机建模方法[J].石油天然气学报,2009,31(4):106-110.
[7]徐志华.离散裂缝网络地质建模技术研究[D].山东:中国石油大学(华东),2009.
[8]Pan J B,Lee C C,Lee C H,et al.Application of fracture network model with crack permeability tensor on flow and transport in fractured rock[J].Engineering Geology,2010,116:166-177.
[9]Parashar R,Reeves D M.On iterative techniques for computing flow in large two-dimensional discrete fracture networks[J].Journal of Computational and Applied Mathematics,2012,236:4712-4724.
[10]Raynald J,Dreuzy D,Pichotc G,et al.Synthetic benchmark for modeling flow in 3D fractured media[J].Computers&Geosciences,2013,50:59-71.
[11]Du C,Zhang X,Melton B,et al,A workflow for integrated Barnett Shale Gas Reservoir Modeling and Simulation.SPE 122934,2009:1-12.
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