孤东油田七区西馆五段曲流河点坝内部构型
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摘要
馆陶组馆五段是孤东油田七区西的主力油层,储集层为曲流河沉积的疏松砂岩。油田开发中,新钻井目的层剩余油饱和度与预期不符,无法实现原来的设计目标;老井实施的调整和挖潜效果与地质认识不匹配,加大了油田增产的难度,急需明确曲流河点坝储集层内部构型要素与剩余油的关系。通过对密闭取心井岩心的研究,总结出点坝内部侧积层的数量和岩石类型,分析不同岩性侧积层渗流及点坝内部剩余油的分布特点;利用密井网资料,对点坝内部构型要素进行解剖,明确侧积层厚度、产状及展布特征,进而推算出点坝的长度与宽度,曲流河的深度与满岸宽度;并对研究区的废弃河道进行了识别,得到研究区废弃河道平面展布特征;结合测井、岩心、分析化验等资料,解剖对子井点坝内部构型,对紧邻注水井的新钻井高剩余油给出了合理解释。研究结果表明,点坝内部构型是控制剩余油分布最为重要的因素,剩余油主要分布于物性较差侧积层之上的储集层中。
The Fifth member of Guantao formation is the main oil layer in the western District 7 of Gudong oilfield and the reservoir belongs to loose sandstones of meandering river deposition. At present, the remaining oil saturation of the target zone in newly-drilled wells is not consistent with the expected one during the oilfield development, so the original designed objects cann't be achieved. The effects of well adjustment and potential tapping in the existing wells don't match with the geological understanding, which increases the difficulties of oilfield stimulation and it is urgent to verify the relationship between the internal configuration elements of meandering-river point bar reservoirs and the remaining oil distribution. Based on the study of the cores obtained from sealed coring wells, the paper summarizes the amount of the lateral accretion layers and rock types within the point bar, analyzes the flowing characteristics of the lateral accretion layers with different lithologies and the remaining oil distribution within the point bar, unravels the key elements of the internal configuration of the point bar, obtains the thickness, occurrence and distribution of the lateral accretion layer, and then calculates the length and width of the point bar and the depth and full shore width of the meandering river. Based on the data of logging, core and lab analysis, the internal configuration of the point bar in paired wells is analyzed and the high remaining oil saturation in the newly-drilled wells adjacent to water injection wells is reasonably explained. The study results show that the internal configuration of the point bar is the most important factor controlling remaining oil distribution and the remaining oil is mainly distributed in the reservoirs above the lateral accretion layers with relatively poor physical properties.
The Fifth member of Guantao formation is the main oil layer in the western District 7 of Gudong oilfield and the reservoir belongs to loose sandstones of meandering river deposition. At present, the remaining oil saturation of the target zone in newly-drilled wells is not consistent with the expected one during the oilfield development, so the original designed objects cann't be achieved. The effects of well adjustment and potential tapping in the existing wells don't match with the geological understanding, which increases the difficulties of oilfield stimulation and it is urgent to verify the relationship between the internal configuration elements of meandering-river point bar reservoirs and the remaining oil distribution. Based on the study of the cores obtained from sealed coring wells, the paper summarizes the amount of the lateral accretion layers and rock types within the point bar, analyzes the flowing characteristics of the lateral accretion layers with different lithologies and the remaining oil distribution within the point bar, unravels the key elements of the internal configuration of the point bar, obtains the thickness, occurrence and distribution of the lateral accretion layer, and then calculates the length and width of the point bar and the depth and full shore width of the meandering river. Based on the data of logging, core and lab analysis, the internal configuration of the point bar in paired wells is analyzed and the high remaining oil saturation in the newly-drilled wells adjacent to water injection wells is reasonably explained. The study results show that the internal configuration of the point bar is the most important factor controlling remaining oil distribution and the remaining oil is mainly distributed in the reservoirs above the lateral accretion layers with relatively poor physical properties.
引文
[1]马世忠,杨清彦.曲流点坝沉积模式、三维构形及其非均质模型[J].沉积学报,2000,18(2):242-247.MA Shizhong,YANG Qingyan.The depositional model,3-D architecture and heterogeneous model of point bar in meandering channels[J].Acta Sedimentologica Sinica,2000,18(2):242-247.
[2]肖正录,陈世加,廖建波,等.河道构型单元及其对油藏的控制作用--以鄂尔多斯盆地华庆地区长8段储集层为例[J].新疆石油地质,2018,39(5):524-529.XIAO Zhenglu,CHEN Shijia,LIAO Jianbo,et al.Channel architecture element and its controls on hydrocarbon accumulation:a case study from Chang-8 member in Huaqing area,Ordos basin[J].Xinjiang Petroleum Geology,2018,39(5):524-529.
[3]邹拓,刘应忠,聂国振.曲流河点坝内部构型精细研究及应用[J].现代地质,2014,28(3):611-616.ZOU Tuo,LIU Yingzhong,NIE Guozhen.Fine research and application of internal architecture in point bar of meandering river[J].Geosciece,2014,28(3):611-616.
[4]周银邦,吴胜和,计秉玉,等.曲流河储层构型表征研究进展[J].地球科学进展,2011,26(7):695-702.ZHOU Yinbang,WU Shenghe,JI Bingyu,et al.Research progress on the characterization of reservoir architecture[J].Advances in Earth Science,2011,26(7):695-702.
[5]孙红霞,赵玉杰,姚军.一种新的曲流河点坝砂体侧积层建模方法--以孤东油田七区西Ng2+35层系为例[J].新疆石油地质,2017,38(4):477-481.SUN Hongxia,ZHAO Yujie,YAO Jun.A new modeling method of lateral accretion layers in sandbodies of meandering river point bars:a case study from Ng2+35layer of western district 7 in Gudong oilfield[J].Xinjiang Petroleum Geology,2017,38(4):477-481.
[6]冯佃亮,傅强,李林祥,等.孤东油田七区西Ng52+3砂层组流动单元类型划分及应用[J].断块油气田,2016,23(5):603-605.FENG Dianliang,FU Qiang,LI Linxiang,et al.Division and application of flow units in Ng52+3sand group of Gudong oilfield[J].FaultBlock Oil&Gas Field,2016,23(5):603-605.
[7]李阳,郭长春.地下侧积砂坝建筑结构研究及储层评价--以孤东油田七区西Ng52+3砂体为例[J].沉积学报,2007,25(6):942-948.LI Yang,GUO Changchun.The architecture and reservoir evaluation of underground lateral accretion bar:a case study on the Ng52+3sand-bady in 7th block west of the Gudong oil field[J].Acta Sedimentologica Sinica,2007,25(6):942-948
[8]孙天建,李胜利,许磊,等.长春岭油田C107区块扶余油层密井网曲流河储层构型分析[J].地学前缘,2012,19(2):126-132.SUN Tianjian,LI Shengli,XU Lei,et al.Architectural analysis of meandering river resevoirs in Fuyu oil layer,C107 block,Changchunling oilfield[J].Earth Science Frontiers,2012,19(2):126-132.
[9]马世忠,孙雨,范广娟,等.地下曲流河道单砂体内部薄夹层建筑结构研究方法[J].沉积学报,2008,26(4):632-639.MA Shizhong,SUN Yu,FAN Guangjuan,et al.The method for studying thin interbed architecture of burial meandering channel sandbody[J].Acta Sedimentologica Sinica,2008,26(4):632-639.
[10]闫百泉,张鑫磊,于利民,等.基于岩心及密井网的点坝构型与剩余油分析[J].石油勘探与开发,2014,41(5):597-604.YAN Baiquan,ZHANG Xinlei,YU Limin,et al.Point bar configuration and residual oil analysis based on core and dense well pattern[J].Petroleum Exploration and Development,2014,41(5):597-604.
[11]单敬福,赵忠军,李浮萍,等.曲流河道沉积演化过程与历史重建--以吉林油田扶余采油厂杨大城子油层为例[J].沉积学报,2015,33(3):448-458.SHAN Jingfu,ZHAO Zhongjun,LI Fuping,et al.Evolution process and historical reconstruction of meandering river:an example from Fuyu oil reservoir of Yangdachengzi oil production plant in Jilin oilfield[J].Acta Sedimentologica Sinica,2015,33(3):448-458.
[12]LEEDER M R.Fluviatile fining upwards cycles and the magnitude of palechannels[J].Geological Magazine,1973,110(3):265-276.
[13]LORENZ J C,HEINZE D M,CLACK J A,et al.Determination of width of meander-belt sandstone reservoirs from vertical downhole data,Mesaverde group,Piceance Greek basin,Colorado[J].AAPGBulletin,1985,69(2):710-721.
[14]岳大力,吴胜和,刘建民.曲流河点坝地下储层构型精细解剖方法[J].石油学报,2007,28(4):99-104.YUE Dali,WU Shenghe,LIU Jianmin.An accurate method for anatomizing architecture of subsurface reservoir in point bar of meandering river[J].Acta Petrolei Sinica,2007,28(4):99-104.
[15]周新茂,高兴军,季丽丹,等.曲流河废弃河道的废弃类型及机理分析[J].西安石油大学学报(自然科学版),2010,25(1):19-23.ZHOU Xinmao,GAO Xingjun,JI Lidan,et al.Analysis on the types the sedimentation mechanism of the abandoned channel in meandering river[J].Journal of Xi’an Shiyou University(Natural Science Edition),2010,25(1):19-23.
[16]张本华.曲流河储层构型中废弃河道的识别及其分布模式--以孤岛油田馆上段为例[J].油气地质与采收率,2013,20(3):18-21.ZHANG Benhua.Discussion on abandoned channels recognition and distribution models on meandering river reservoir architecture research-case study of upper member of Guantao formation in Gudao oilfield[J].Petroleum Geology and Recovery Efficiency,2013,20(3):18-21.
[2]肖正录,陈世加,廖建波,等.河道构型单元及其对油藏的控制作用--以鄂尔多斯盆地华庆地区长8段储集层为例[J].新疆石油地质,2018,39(5):524-529.XIAO Zhenglu,CHEN Shijia,LIAO Jianbo,et al.Channel architecture element and its controls on hydrocarbon accumulation:a case study from Chang-8 member in Huaqing area,Ordos basin[J].Xinjiang Petroleum Geology,2018,39(5):524-529.
[3]邹拓,刘应忠,聂国振.曲流河点坝内部构型精细研究及应用[J].现代地质,2014,28(3):611-616.ZOU Tuo,LIU Yingzhong,NIE Guozhen.Fine research and application of internal architecture in point bar of meandering river[J].Geosciece,2014,28(3):611-616.
[4]周银邦,吴胜和,计秉玉,等.曲流河储层构型表征研究进展[J].地球科学进展,2011,26(7):695-702.ZHOU Yinbang,WU Shenghe,JI Bingyu,et al.Research progress on the characterization of reservoir architecture[J].Advances in Earth Science,2011,26(7):695-702.
[5]孙红霞,赵玉杰,姚军.一种新的曲流河点坝砂体侧积层建模方法--以孤东油田七区西Ng2+35层系为例[J].新疆石油地质,2017,38(4):477-481.SUN Hongxia,ZHAO Yujie,YAO Jun.A new modeling method of lateral accretion layers in sandbodies of meandering river point bars:a case study from Ng2+35layer of western district 7 in Gudong oilfield[J].Xinjiang Petroleum Geology,2017,38(4):477-481.
[6]冯佃亮,傅强,李林祥,等.孤东油田七区西Ng52+3砂层组流动单元类型划分及应用[J].断块油气田,2016,23(5):603-605.FENG Dianliang,FU Qiang,LI Linxiang,et al.Division and application of flow units in Ng52+3sand group of Gudong oilfield[J].FaultBlock Oil&Gas Field,2016,23(5):603-605.
[7]李阳,郭长春.地下侧积砂坝建筑结构研究及储层评价--以孤东油田七区西Ng52+3砂体为例[J].沉积学报,2007,25(6):942-948.LI Yang,GUO Changchun.The architecture and reservoir evaluation of underground lateral accretion bar:a case study on the Ng52+3sand-bady in 7th block west of the Gudong oil field[J].Acta Sedimentologica Sinica,2007,25(6):942-948
[8]孙天建,李胜利,许磊,等.长春岭油田C107区块扶余油层密井网曲流河储层构型分析[J].地学前缘,2012,19(2):126-132.SUN Tianjian,LI Shengli,XU Lei,et al.Architectural analysis of meandering river resevoirs in Fuyu oil layer,C107 block,Changchunling oilfield[J].Earth Science Frontiers,2012,19(2):126-132.
[9]马世忠,孙雨,范广娟,等.地下曲流河道单砂体内部薄夹层建筑结构研究方法[J].沉积学报,2008,26(4):632-639.MA Shizhong,SUN Yu,FAN Guangjuan,et al.The method for studying thin interbed architecture of burial meandering channel sandbody[J].Acta Sedimentologica Sinica,2008,26(4):632-639.
[10]闫百泉,张鑫磊,于利民,等.基于岩心及密井网的点坝构型与剩余油分析[J].石油勘探与开发,2014,41(5):597-604.YAN Baiquan,ZHANG Xinlei,YU Limin,et al.Point bar configuration and residual oil analysis based on core and dense well pattern[J].Petroleum Exploration and Development,2014,41(5):597-604.
[11]单敬福,赵忠军,李浮萍,等.曲流河道沉积演化过程与历史重建--以吉林油田扶余采油厂杨大城子油层为例[J].沉积学报,2015,33(3):448-458.SHAN Jingfu,ZHAO Zhongjun,LI Fuping,et al.Evolution process and historical reconstruction of meandering river:an example from Fuyu oil reservoir of Yangdachengzi oil production plant in Jilin oilfield[J].Acta Sedimentologica Sinica,2015,33(3):448-458.
[12]LEEDER M R.Fluviatile fining upwards cycles and the magnitude of palechannels[J].Geological Magazine,1973,110(3):265-276.
[13]LORENZ J C,HEINZE D M,CLACK J A,et al.Determination of width of meander-belt sandstone reservoirs from vertical downhole data,Mesaverde group,Piceance Greek basin,Colorado[J].AAPGBulletin,1985,69(2):710-721.
[14]岳大力,吴胜和,刘建民.曲流河点坝地下储层构型精细解剖方法[J].石油学报,2007,28(4):99-104.YUE Dali,WU Shenghe,LIU Jianmin.An accurate method for anatomizing architecture of subsurface reservoir in point bar of meandering river[J].Acta Petrolei Sinica,2007,28(4):99-104.
[15]周新茂,高兴军,季丽丹,等.曲流河废弃河道的废弃类型及机理分析[J].西安石油大学学报(自然科学版),2010,25(1):19-23.ZHOU Xinmao,GAO Xingjun,JI Lidan,et al.Analysis on the types the sedimentation mechanism of the abandoned channel in meandering river[J].Journal of Xi’an Shiyou University(Natural Science Edition),2010,25(1):19-23.
[16]张本华.曲流河储层构型中废弃河道的识别及其分布模式--以孤岛油田馆上段为例[J].油气地质与采收率,2013,20(3):18-21.ZHANG Benhua.Discussion on abandoned channels recognition and distribution models on meandering river reservoir architecture research-case study of upper member of Guantao formation in Gudao oilfield[J].Petroleum Geology and Recovery Efficiency,2013,20(3):18-21.
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