镇北油田长8段储集层孔隙类型与水驱油渗流特征
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摘要
针对鄂尔多斯盆地镇北油田延长组长8段储集层微观孔隙类型复杂、水驱油规律认识薄弱等问题,应用砂岩微观水驱油模型,结合铸体薄片、扫描电镜等手段,对长8油藏的微观孔隙类型及水驱油渗流特征进行研究。结果表明,研究区长8油藏储集空间以残余粒间孔、溶蚀孔和微裂缝为主;驱替类型主要为网状驱替和指状驱替,均匀驱替较少,不同驱替类型水驱油效率不同,均匀驱替效率最高,指状驱替效率最低。水驱油效率与渗透率相关性较高,相关系数为0.84,与孔隙度相关系数为0.51,储集层非均质性也是影响水驱油效率的重要因素。
Regarding the complex microscopic pore structures and the weak understanding on water flooding regularity, the paper studiesthe microscopic pore structures and the flowing characteristics of oil displacement by water in the reservoir of the Chang-8 member by us-ing sandstone waterflooding model, cast thin section and SEM analysis in Zhenbei oilfield, Ordos basin. The results show that the accumula-tion spaces of the Chang-8 reservoir in the study area can be divided into residual intergranular pores, dissolved pores and microcracks; thedisplacement types are dominated by network displacement and finger-like displacement and even displacement seldom occurs. Differenttypes of waterflooding have different displacement efficiencies, the efficiency of even displacement is the highest and that of finger-like dis-placement is the lowest. The waterflooding efficiency highly correlates with the permeability with the correlation coefficient of 0.84 and thecorrelation coefficient between the waterflooding efficiency and porosity is 0.51. Reservoir heterogeneity is also an important factor influenc-ing the waterflooding efficiency.
Regarding the complex microscopic pore structures and the weak understanding on water flooding regularity, the paper studiesthe microscopic pore structures and the flowing characteristics of oil displacement by water in the reservoir of the Chang-8 member by us-ing sandstone waterflooding model, cast thin section and SEM analysis in Zhenbei oilfield, Ordos basin. The results show that the accumula-tion spaces of the Chang-8 reservoir in the study area can be divided into residual intergranular pores, dissolved pores and microcracks; thedisplacement types are dominated by network displacement and finger-like displacement and even displacement seldom occurs. Differenttypes of waterflooding have different displacement efficiencies, the efficiency of even displacement is the highest and that of finger-like dis-placement is the lowest. The waterflooding efficiency highly correlates with the permeability with the correlation coefficient of 0.84 and thecorrelation coefficient between the waterflooding efficiency and porosity is 0.51. Reservoir heterogeneity is also an important factor influenc-ing the waterflooding efficiency.
引文
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[10]全洪慧,朱玉双,张洪军,等.储层孔隙结构与水驱油微观渗流特征——以安塞油田王窑区长6油层组为例[J].石油与天然气地质,2011,32(6):952-960.QUAN Honghui,ZHU Yushuang,ZHANG Hongjun,et al. Reservoir pore structure and micro-flow characteristcis of waterflooding:a case study from Chang-6 reservoir of Wangyao block in Ansai field[J]. Oil&Gas Geology,2011,32(6):952-960.
[11]任晓娟,曲志浩,史承恩,等.西峰油田特低渗弱亲油储层微观水驱油特征[J].西北大学学报(自然科学版),2005,35(6):766-770.REN Xiaojuan,QU Zhihao,SHI Chengen,et al. Micro-flowing behaviors of water displacing oil in low permeability weak oil-wet reservoirs,Xifeng oilfield[J]. Journal of Northwest University(Natural Science Edition),2005,35(6):766-770.
[12]曲志浩,孔令荣.低渗透油层微观水驱油特征[J].西北大学学报(自然科学版),2002,32(4):329-334.QU Zhihao,KONG Lingrong. A study of characteristics of low permeability formation with water flooding using micromodel experiment[J]. Journal of Northwest University(Natural Science Edition),2002,32(4):329-334.
[13]张茜,任大忠,任强燕,等.鄂尔多斯盆地姬塬油田长6储层微观孔隙结构特征及其对水驱油特征的影响[J].西北大学学报(自然科学版),2015,45(2):283-290.ZHANG Xi,REN Dazhong,REN Qiangyan,et al. The feature of the microscopic pore structure and its influence on oil displacement efficiency in Chang 6 reservoir in Jiyuan oilfield of Ordos basin[J]. Journal of Northwest University(Natural Science Edition),2015,45(2):283-290.
[14]王瑞飞,孙卫.特低渗透砂岩微观模型水驱油实验影响驱油效率因素[J].石油实验地质,2010,32(1):93-97.WANG Ruifei,SUN Wei. Main controls for oil displacemnt effciency by the micro-model water flooding experiment in ultra-low permeability sandstone reservoir[J]. Petroleum Geology&Experiment,2010,32(1):93-97.
[15]朱玉双,柳益群,赵继勇,等.不同流动单元微观渗流特征研究——以华池油田长3油藏华152块为例[J].石油实验地质,2008,30(1):103-108.ZHU Yushuang,LIU Yiqun,ZHAO Jiyong,et al. A study on the microflow characterictics of different flow units—taking Hua-152block of Chang 3 reservoir in the Huachi oilfield as an example[J]. Petroleum Geology&Experiment,2008,30(1):103-108.
[16]崔悦,石京平.大庆油田表外储层渗流特征实验[J].大庆石油地质与开发,2017,36(2):69-72.CUI Yue,SHI Jingping. Experiment on the seepage features for the untabulated reservoirs in Daqing oilfield[J]. Petroleum Geology&Oilfield Development in Daqing,2017,36(2):69-72.
[17]马全华,孙卫,吴诗平,等.层状砂岩油藏提高水驱油效率的对策分析[J].西北大学学报(自然科学版),1999,29(5):413-416.MA Huaquan,SUN Wei,WU Shiping,et al. Counter-measure analysis of oil-water displacement efficiency in stratified sandstone oil reservoir[J]. Journal of Northwest University(Natural Science Edition),1999,29(5):413-416.
[18]王瑞飞,陈明强.特低渗透砂岩储层可动流体赋存特征及影响因素[J].石油学报,2008,29(4):558-561.WANG Ruifei,CHEN Mingqiang. Characteristics and influencing factors of movable fluid in ultra-low permeability sandstone reservoir[J]. Acta Petrolei Sinica,2008,29(4):558-561.
[2]纪淑红,田昌炳,石成方,等.高含水阶段重新认识水驱油效率[J].石油勘探与开发,2012,39(3):338-345.JI Shuhong,TIAN Changbing,SHI Chengfang,et al. New understanding on water-oil displacement efficiency on a high water-cut stage[J]. Petroleum Exploration and Development,2012,39(3):338-345.
[3]赵阳,曲志浩,刘震.裂缝水驱油机理的真实砂岩微观模型实验研究[J].石油勘探与开发,2002,29(1):116-119.ZHAO Yang,QU Zhihao,LIU Zhen. Experiment on water/oil displacement mechanisms in fractured reservoir by real sandstone micromodels[J]. Petroleum Exploration and Development,2002,29(1):116-119.
[4]孙卫,曲志浩,李劲峰.安塞特低渗透油田见水后的水驱油机理及开发效果分析[J].石油实验地质,1999,21(3):256-260.SUN Wei,QU Zhihao,LI Jinfeng. Analysis on the water-drive mechanism and development results of Ansai supertight oil field afer water-occurrence[J]. Petroleum Geology&Experiment,1999,21(3):256-260.
[5]王学军,王志欣,陈杰,等.鄂尔多斯盆地镇北油田延长组石油运聚机理[J].石油勘探与开发,2011,38(3):299-306.WANG Xuejun,WANG Zhixin,CHEN Jie,et al. Petroleum migration and accumulation of the Yanchang formation of Zhenbei oilfield,Ordos basin[J]. Petroleum Exploration and Development,2011,38(3):299-306.
[6]王学军,王志欣,陈杰,等.鄂尔多斯盆地镇北油田延长组低渗透储层成因及油气运移特征[J].油气地质与采收率,2010,17(1):15-18.WANG Xuejun,WANG Zhixin,CHEN Jie,et al. Low permeability reservoirs genesis and petroleum migration of Yanchang formation Zhenbei oilfield,Ordos basin[J]. Petroleum Geology and Recovery Efficiency,2010,17(1):15-18.
[7]童凯军,刘慧卿,张迎春,等.变质岩裂缝性油藏水驱油特征三维物理模拟[J].石油勘探与开发,2015,42(4):538-544.TONG Kaijun,LIU Huiqing,ZHANG Yingchun,et al. Three diminsional physical modeling of waterflooding in metamorphic fractured reservoir[J]. Petroleum Exploration and Development,2015,42(4):538-544.
[8]郑浩,苏彦春,张迎春,等.裂缝性油藏渗流特征及驱替机理数值模拟研究[J].油气地质与采收率,2014,21(4):79-83.ZHENG Hao,SU Yanchun,ZHANG Yingchun,et al. The numerical simulation study on percolation characteristics and displacement mechanism of fractured reservoir[J]. Petroleum Geology and Recovery Efficiency,2014,21(4):79-83.
[9]任大忠,孙卫,赵继勇,等.鄂尔多斯盆地岩性油藏微观水驱油特征及影响因素——以华庆油田长81油藏为例[J].中国矿业大学学报,2015,44(6):1 043-1 052.REN Dazhong,SUN Wei,ZHAO Jiyong,et al. Microscopic water flooding characteristic of lithologic reservoir in Ordos basin and its influence factors:taking the Chang81reservoir in Huaqing oilfield as an example[J]. Journal of China University of Mining&Technology,2015,44(6):1 043-1 052.
[10]全洪慧,朱玉双,张洪军,等.储层孔隙结构与水驱油微观渗流特征——以安塞油田王窑区长6油层组为例[J].石油与天然气地质,2011,32(6):952-960.QUAN Honghui,ZHU Yushuang,ZHANG Hongjun,et al. Reservoir pore structure and micro-flow characteristcis of waterflooding:a case study from Chang-6 reservoir of Wangyao block in Ansai field[J]. Oil&Gas Geology,2011,32(6):952-960.
[11]任晓娟,曲志浩,史承恩,等.西峰油田特低渗弱亲油储层微观水驱油特征[J].西北大学学报(自然科学版),2005,35(6):766-770.REN Xiaojuan,QU Zhihao,SHI Chengen,et al. Micro-flowing behaviors of water displacing oil in low permeability weak oil-wet reservoirs,Xifeng oilfield[J]. Journal of Northwest University(Natural Science Edition),2005,35(6):766-770.
[12]曲志浩,孔令荣.低渗透油层微观水驱油特征[J].西北大学学报(自然科学版),2002,32(4):329-334.QU Zhihao,KONG Lingrong. A study of characteristics of low permeability formation with water flooding using micromodel experiment[J]. Journal of Northwest University(Natural Science Edition),2002,32(4):329-334.
[13]张茜,任大忠,任强燕,等.鄂尔多斯盆地姬塬油田长6储层微观孔隙结构特征及其对水驱油特征的影响[J].西北大学学报(自然科学版),2015,45(2):283-290.ZHANG Xi,REN Dazhong,REN Qiangyan,et al. The feature of the microscopic pore structure and its influence on oil displacement efficiency in Chang 6 reservoir in Jiyuan oilfield of Ordos basin[J]. Journal of Northwest University(Natural Science Edition),2015,45(2):283-290.
[14]王瑞飞,孙卫.特低渗透砂岩微观模型水驱油实验影响驱油效率因素[J].石油实验地质,2010,32(1):93-97.WANG Ruifei,SUN Wei. Main controls for oil displacemnt effciency by the micro-model water flooding experiment in ultra-low permeability sandstone reservoir[J]. Petroleum Geology&Experiment,2010,32(1):93-97.
[15]朱玉双,柳益群,赵继勇,等.不同流动单元微观渗流特征研究——以华池油田长3油藏华152块为例[J].石油实验地质,2008,30(1):103-108.ZHU Yushuang,LIU Yiqun,ZHAO Jiyong,et al. A study on the microflow characterictics of different flow units—taking Hua-152block of Chang 3 reservoir in the Huachi oilfield as an example[J]. Petroleum Geology&Experiment,2008,30(1):103-108.
[16]崔悦,石京平.大庆油田表外储层渗流特征实验[J].大庆石油地质与开发,2017,36(2):69-72.CUI Yue,SHI Jingping. Experiment on the seepage features for the untabulated reservoirs in Daqing oilfield[J]. Petroleum Geology&Oilfield Development in Daqing,2017,36(2):69-72.
[17]马全华,孙卫,吴诗平,等.层状砂岩油藏提高水驱油效率的对策分析[J].西北大学学报(自然科学版),1999,29(5):413-416.MA Huaquan,SUN Wei,WU Shiping,et al. Counter-measure analysis of oil-water displacement efficiency in stratified sandstone oil reservoir[J]. Journal of Northwest University(Natural Science Edition),1999,29(5):413-416.
[18]王瑞飞,陈明强.特低渗透砂岩储层可动流体赋存特征及影响因素[J].石油学报,2008,29(4):558-561.WANG Ruifei,CHEN Mingqiang. Characteristics and influencing factors of movable fluid in ultra-low permeability sandstone reservoir[J]. Acta Petrolei Sinica,2008,29(4):558-561.