鄂尔多斯盆地姬塬油田长6储层敏感性研究
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摘要
以鄂尔多斯盆地姬塬油田长6超低渗透砂岩油藏储层为例,结合扫描电镜分析、岩芯样品鉴定、X-射线衍射分析和常规压汞试验分析等方法,对储层敏感性进行了深入的研究。重点分析了敏感性类型、伤害的程度和对储层的影响因素。研究结果表明:姬塬油田长6储层的主要黏土矿物为伊利石、高岭石、绿泥石和伊蒙混层等,导致储层敏感性的主要因素是其中的绿泥石、高岭石和伊利石等黏土矿物。储层具有中等偏弱水敏、弱速敏、中等偏弱酸敏、弱碱敏、中等偏弱盐敏特征。储层敏感性整体呈弱敏感性。除此之外,姬塬地区储层的敏感性还与储层的物性和孔隙结构有关:储层孔隙结构的好坏对储层水敏性有直接影响;孔隙结构较差、喉道较细、分选性差的储层,易造成微粒堵塞喉道,速敏结果表现为速敏性强。
A case study on reservoir sensitivity from Chang 6 ultra-low permeability sandstone reservoir in the Jiyuan oilfield in Ordos Basin is carried out,in combination with SEM analysis,core sample studies,X-ray diffraction analysis,conventional mercury pressure test and other methods.The sensitivity types,degree of injury and influence factors of reservoir were analyzed.Research results show that the clay minerals of Jiyuan Oilfield in Ordos Basin are mainly consist of chlorite,kaolinite,illite and mixed-layer montmorillonite-illite,and the main factors causing reservoir sensitivity are chlorite,kaolinite and illite.The reservoir is characterized by weak-medium water sensitivity,weak velocity sensitivity,weak-medium acid sensitivity,weak alkali sensitivity and weak-medium salt sensitivity.The reservoir shows weak sensibility generally.The sensitivity of the reservoir in the Jiyuan area is also related to the pore structure and physical properties of reservoir.The reservoir pore structure has direct influence on reservoir water sensitivity.The results of velocity sensitivity experiment shows strong sensibility in poor pore structure,tiny throat and poorly sorted reservoir,in which the throat of reservoir is easy to be blocked.
A case study on reservoir sensitivity from Chang 6 ultra-low permeability sandstone reservoir in the Jiyuan oilfield in Ordos Basin is carried out,in combination with SEM analysis,core sample studies,X-ray diffraction analysis,conventional mercury pressure test and other methods.The sensitivity types,degree of injury and influence factors of reservoir were analyzed.Research results show that the clay minerals of Jiyuan Oilfield in Ordos Basin are mainly consist of chlorite,kaolinite,illite and mixed-layer montmorillonite-illite,and the main factors causing reservoir sensitivity are chlorite,kaolinite and illite.The reservoir is characterized by weak-medium water sensitivity,weak velocity sensitivity,weak-medium acid sensitivity,weak alkali sensitivity and weak-medium salt sensitivity.The reservoir shows weak sensibility generally.The sensitivity of the reservoir in the Jiyuan area is also related to the pore structure and physical properties of reservoir.The reservoir pore structure has direct influence on reservoir water sensitivity.The results of velocity sensitivity experiment shows strong sensibility in poor pore structure,tiny throat and poorly sorted reservoir,in which the throat of reservoir is easy to be blocked.
引文
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[12]魏旭.鄂尔多斯盆地召30井区盒8段储层特征及储层敏感性研究:硕士学位论文[D].成都:成都理工大学,2014.WEI Xu.Reservoir characteristics and reservoir sensitivity of the Menber 8 in Zhao 30 Wellblock in Ordos Basin:mater's degree thesis[D].Chengdu:Chendu University of Technology,2014.
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[18]Shu Y,Yan J N.Characterization and prevention of formation damage for fractured carbonate reservoir formations with low permeability[J].Petroleum Science,2008,5(4):326-333.
[2]姚泾利,赵彦德,邓秀芹,等.鄂尔多斯盆地延长组致密油成藏控制因素[J].吉林大学学报(地球科学版),2015,45(4):983-992.YAO Jing-li,ZHAO Yan-de,DENG Xiu-qin.et al.Controlling factors of oil reservoir in Yanchang Formation in Ordos Baisn[J].Journal of Jilin University(Earth Science Edition),2015,45(4):983-992.
[3]卢进才,李玉宏,魏仙样,等.鄂尔多斯盆地三叠系延长组长7油层组油页岩沉积环境与资源潜力研究[J].吉林大学学报(地球科学版),2006,36(6):928-932.LU Jin-cai,LI Yu-hong,WEI Xian-yang,et al.Research on the depositional environment and resources potential of the oil shale in the Chang 7 member,Triassic Yanchang Formation in the Ordos Basin[J].Journal of Jilin University(Earth Science Edition),2006,36(6):928-932.
[4]于均民.鄂尔多斯盆地三叠系延长组长6段超低渗透储层特征:博士学位论文[D].北京:中国地质大学(北京),2012.YU Jun-min.Characteristics of ultra-low permeability reservoirs in Chang 6 of Triassic Yanchang Formation in Ordos Basin:doctor's degree thesis[D].Beijing:China University of Geosciences,2012.
[5]Rahman M,Sarma H K.Enhancing tight gas recovery through hydraulic fracture treatment design optimization[J].Advances in Petroleum Exploration and Development,2013,5(2):1-7.
[6]杨孝,李廷艳,尤源,等.鄂尔多斯盆地合水地区延长组长6段砂体结构特征及成因分析[J].世界地质,2016,35(3):789-800.YANG Xiao,LI Ting-yan,YOU Yuan,et al.Sandbody structural characteristics of Chang 6 member of Yanchang Formation and its origin in Heshui area in Ordos Basin[J].Global Geology,2016,35(3):789-800.
[7]窦伟坦,田景春,王峰,等.鄂尔多斯盆地长6油层组储集砂岩成岩作用及其对储层性质的影响[J].成都理工大学学报(自然科学版),2009,36(2):153-158.DOU Wei-tan,TIAN Jing-chun,WANG Feng,et al.Diagenesis of reservoir sandstone in Chang 6 oil-bearing group of Ordos Basin and its effect on reservoir properties[J].Journal of Chengdu University of Technology(Natural Science Edition),2009,36(2):153-158.
[8]谢姗,李治平,姜兆辉,等.大庆三肇地区扶余油层储层敏感性分析[J].天然气与石油,2011,29(6):63-66.XIE Shan,LI Zhi-ping,JIANG Zhao-hui,et al.Sensitivity analysis of Fuyu reservoir in Sanzhao area of Daqing[J].Natural Gas and Oil,2011,29(6):63-66.
[9]公繁浩,鲍志东,刘丽,等.鄂尔多斯盆地姬塬地区长6油层组沉积微相特征[J].世界地质,2010,29(4):614-639.GONG Fan-hao,BAO Zhi-dong,LIU Li,et al.Characteristics of sedimentary microfacies of Chang 6 oil-bearing formation in Jiyuan area of Ordos Basin[J].Global Geology,2010,29(4):614-639.
[10]冯娟萍,郭艳琴,余芳.鄂尔多斯盆地富县探区延长组物源与沉积体系分析[J].西安科技大学学报,2013,33(2):178-184.FENG Juan-ping,GUO Yan-qin,YU Fang.Analysis of provenance and sedimentary system of Yanchang Formation in Fuxian exploration area,Ordos Basin[J].Journal of Xi'an University of Science and Technology,2013,33(2):178-184.
[11]张振红,汪伶俐,朱静.姬塬地区长6油层组砂岩储层中黏土矿物分布规律研究[J].西安科技大学学报,2015,35(2):197-201.ZHANG Zhen-hong,WANG Ling-li,ZHU Jing.Study on distribution law of clay mineral in sandstone reservoir of Chang 6 oil formation in Jiyuan Area[J].Journal of Xi'an University of Science and Technology,2015,35(2):197-201.
[12]魏旭.鄂尔多斯盆地召30井区盒8段储层特征及储层敏感性研究:硕士学位论文[D].成都:成都理工大学,2014.WEI Xu.Reservoir characteristics and reservoir sensitivity of the Menber 8 in Zhao 30 Wellblock in Ordos Basin:mater's degree thesis[D].Chengdu:Chendu University of Technology,2014.
[13]孙黎娟,乔国安,邹兴,等.水敏指数变化规律研究[J].石油实验地质,2001,23(4):429-432.SUN Li-juan,QIAO Guo-an,ZOU Xing,et al.Study on variation law of water sensitivity index[J].Petroleum Experimental Geology,2001,23(4):429-432.
[14]石小虎,安文宏,王少飞,等.鄂尔多斯盆地东部上古生界储层敏感性实验研究[J].石油化工应用,2013,32(1):25-30.SHI Xiao-hu,AN Wen-hong,WANG Shao-fei,et al.Sensitivity experiment study of upper paleozoic reservoirs in eastern Ordos Basin[J].Petrochemical Applications,2013,32(1):25-30.
[15]石京平,宫文超,曹维政,等.储层岩石速敏伤害机理研究[J].成都理工大学学报(自然科学版),2003,30(5):501-504.SHI Jing-ping,GONG Wen-chao,CAO Wei-zheng,et al.Study on mechanism of rock velocity sensitivity damage in reservoir[J].Journal of Chengdu University of Technology(Natural Science Edition),2003,30(5):501-504.
[16]赵景原.海拉尔希三区块储层敏感性及伤害机理研究:硕士学位论文[D].大庆:大庆石油学院,2008.ZHAO Jing-yuan.Research on the formation sensitivity and damage mechanism of Hailaer Xisan Block:mater's degree thesis[D].Daqing:Daqing Petroleum Institute,2008.
[17]俞杨烽,康毅力,游利军.水膜厚度变化:特低渗透砂岩储层盐敏性的新机理[J].重庆大学学报,2011,34(4):67-71.YU Yang-feng,KANG Yi-li,YOU Li-jun.Thickness change of water film:new mechanism of salt sensitivity in extre-low permeability sandstone reservoirs[J].Journal of Chongqing University,2011,34(4):67-71.
[18]Shu Y,Yan J N.Characterization and prevention of formation damage for fractured carbonate reservoir formations with low permeability[J].Petroleum Science,2008,5(4):326-333.