坨11井区南沙二段8砂组河口坝砂体岩相组合识别及对储层的控制作用
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摘要
中高渗透砂岩油藏经数十年的注水开发后进入特高含水后期,形成强吸水、低驱替效率的高耗水带,且高耗水带仅形成于单砂体的某一特定位置,以单砂体为研究单元的地质分析已难以满足该类油藏剩余油挖潜的需要。为此,基于岩心、露头的岩相分析,以岩性为主控因素将开发地质研究单元细化为岩相组合级次,并利用灰色关联分析法实现岩相组合的常规测井资料地质解释。依据井资料归纳坨11井区南沙二段8砂组河口坝复合砂体和单砂体的岩相组合模式,并结合储层渗流特征,认为从地质因素方面考虑,复合砂体间高耗水带易在坝主体Ⅱ-坝主体Ⅱ叠置模式中发育,单砂体内高耗水带易在单一坝主体Ⅱ岩相组合发育的朵叶体中部形成,垂向上高耗水带位置与坝主体Ⅱ发育位置相对应。
The mid-high permeability sandstone reservoir has been in the late stage of ultra-high water cut after several de-cades of water flooding. The high water consumption zone with strong water absorption and low displacement efficiencywere inevitably formed in the sandstone reservoirs,moreover formed only at a specific position of single sandbody. It hasbeen difficult for regarding the geological analysis of single sand body as the research unit to meet the needs of residual oilexcavation in such reservoirs. Based on the lithofacies analysis of core and outcrop,the development geological researchunit was refined into the lithofacies combination grade with lithology as the main controlling factor,and the conventionallogging data of the lithofacies combination were interpreted geologically by the grey correlation analysis method. Based onthe well data,the lithofacies modes of the composite mouth sand bars and the single sand bodies in No.8 sand group of thesecond member of Shahejie Formation were summarized in the south of Tuo11 area. Combining with the seepage character-istics of the reservoir,it was concluded from the standpoint of static geological factors that the high water consumption zonewould develop in the superposition mode of bar Ⅱ-bar Ⅱ in the composite sand bodies,and in the middle part of the lobebody of the single main bar Ⅱ mode in the single sand body,and the development position of the high water consumptionzone corresponds to that of the bar Ⅱ in vertical direction.
The mid-high permeability sandstone reservoir has been in the late stage of ultra-high water cut after several de-cades of water flooding. The high water consumption zone with strong water absorption and low displacement efficiencywere inevitably formed in the sandstone reservoirs,moreover formed only at a specific position of single sandbody. It hasbeen difficult for regarding the geological analysis of single sand body as the research unit to meet the needs of residual oilexcavation in such reservoirs. Based on the lithofacies analysis of core and outcrop,the development geological researchunit was refined into the lithofacies combination grade with lithology as the main controlling factor,and the conventionallogging data of the lithofacies combination were interpreted geologically by the grey correlation analysis method. Based onthe well data,the lithofacies modes of the composite mouth sand bars and the single sand bodies in No.8 sand group of thesecond member of Shahejie Formation were summarized in the south of Tuo11 area. Combining with the seepage character-istics of the reservoir,it was concluded from the standpoint of static geological factors that the high water consumption zonewould develop in the superposition mode of bar Ⅱ-bar Ⅱ in the composite sand bodies,and in the middle part of the lobebody of the single main bar Ⅱ mode in the single sand body,and the development position of the high water consumptionzone corresponds to that of the bar Ⅱ in vertical direction.
引文
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[2]王端平.对胜利油区提高原油采收率潜力及转变开发方式的思考[J].油气地质与采收率,2014,21(4):1-4.WANG Duanping.Some thoughts about potential of oil recovery efficiency and development model transition in Shengli district[J].Petroleum Geology and Recovery Efficiency,2014,21(4):1-4.
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[4]柏明星,张志超,李岩,等.砂岩油田高含水后期变流线精细调整研究[J].特种油气藏,2017,24(2):86-88,164.BAI Mingxing,ZHANG Zhichao,LI Yan,et al.Study on precise flooding direction adjustment of sandstone oilfields in the late stage with high water cut[J].Special Oil&Gas Reservoirs,2017,24(2):86-88,164.
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[6]李阳,吴胜和,侯加根,等.油气藏开发地质研究进展与展望[J].石油勘探与开发,2017,44(4):569-579.LI Yang,WU Shenghe,HOU Jiagen,et al.Progress and prospects of reservoir development geology[J].Petroleum Exploration and Development,2017,44(4):569-579.
[7]丁帅伟,姜汉桥,赵冀,等.水驱砂岩油藏优势通道识别综述[J].石油地质与工程,2015,29(5):132-136.DING Shuaiwei,JIANG Hanqiao,ZHAO Ji,et al.General description of preferential migration passage in water-flood sandstone reservoir[J].Petroleum Geology and Engineering,2015,29(5):132-136.
[8]肖康,穆龙新,姜汉桥,等.水驱优势通道下微观潜力分布及改变流线挖潜[J].西南石油大学学报:自然科学版,2017,39(5):92-100.XIAO Kang,MU Longxin,JIANG Hanqiao,et al.Microscopic distribution of potentially and changing streamline direction production under water channeling path[J].Journal of Southwest Petroleum University:Science&Technology Edition,2017,39(5):92-100.
[9]陈红伟,冯其红,张先敏,等.考虑优势通道发育的层状水驱油藏开发指标预测方法[J].油气地质与采收率,2017,24(4):72-77.CHEN Hongwei,FENG Qihong,ZHANG Xianmin,et al.A method of development index prediction for multi-layer waterflooding reservoir with preferential flow path[J].Petroleum Geology and Recovery Efficiency,2017,24(4):72-77.
[10]韩大匡.关于高含水油田二次开发理念、对策和技术路线的探讨[J].石油勘探与开发,2010,37(5):583-591.HAN Dakuang.Discussions on concepts,countermeasures and technical routes for the redevelopment of high water-cut oilfields[J].Petroleum Exploration and Development,2010,37(5):583-591.
[11]韩大匡.准确预测剩余油相对富集区提高油田注水采收率研究[J].石油学报,2007,28(2):73-78.HAN Dakuang.Precisely predicting abundant remaining oil and improving the secondary recovery of mature oilfields[J].Acta Petrolei Sinica,2007,28(2):73-78.
[12]邹存友,于立君.中国水驱砂岩油田含水与采出程度的量化关系[J].石油学报,2012,33(2):288-292.ZOU Cunyou,YU Lijun.A quantization relationship between water cut and degree of reserve recovery for waterflooding sandstone reservoirs in China[J].Acta Petrolei Sinica,2012,33(2):288-292.
[13]吴胜和,纪友亮,岳大力,等.碎屑沉积地质体构型分级方案探讨[J].高校地质学报,2013,19(1):12-22.WU Shenghe,JI Youliang,YUE Dali,et al.Discussion on hierarchical scheme of architectural units in clastic deposits[J].Geological Journal of China Universities,2013,19(1):12-22.
[14]TURNER B R,TESTER G N.The table rocks sandstone:A fluvial,friction-dominated lobate mouth bar sandbody in the Westphalian B Coal Measures,NE England[J].Sedimentary Geology,2006,190(1/4):97-119.
[15]陈彬滔,于兴河,王天奇,等.砂质辫状河岩相与构型特征--以山西大同盆地中侏罗统云冈组露头为例[J].石油与天然气地质,2015,36(1):111-117.CHEN Bintao,YU Xinghe,WANG Tianqi,et al.Lithofacies and architectural characteristics of sandy braided river deposits:a case from outcrops of the Middle Jurassic Yungang Formation in the Datong Basin,Shanxi Province[J].Oil&Gas Geology,2015,36(1):111-117.
[16]杨丽莎,陈彬滔,李顺利,等.基于成因类型的砂质辫状河泥岩分布模式--以山西大同侏罗系砂质辫状河露头为例[J].天然气地球科学,2013,24(1):93-98.YANG Lisha,CHEN Bintao,LI Shunli,et al.Pattern of genesisbased mudstone distribution for sandy braided river:A case study of sandy braided-river outcrop,Datong,Shanxi province,China[J].Natural Gas Geoscience,2013,24(1):93-98.
[17]张顺,刘惠民,陈世悦,等.中国东部断陷湖盆细粒沉积岩岩相划分方案探讨--以渤海湾盆地南部古近系细粒沉积岩为例[J].地质学报,2017,91(5):1 108-1 119.ZHANG Shun,LIU Huimin,CHEN Shiyue,et al.Classification scheme for lithofacies of fine-grained sedimentary rocks in faulted basins of Eastern China:Insights from the fine-grained sedimentary rocks in Paleogene,southern Bohai Bay Basin[J].Acta Geologica Sinica,2017,91(5):1 108-1 119.
[18]曹志民,吴云,韩建,等.测井数据岩相分类的机器学习方法和大数据岩相分类探讨[J].化工自动化及仪表,2017,44(8):717-720,729.CAO Zhimin,WU Yun,HAN Jian,et al.Machine learning methods for log data lithofacies classification and big data lithology classification discussion[J].Control and Instruments in Chemical Industry,2017,44(8):717-720,729.
[19]付金华,邓秀芹,楚美娟,等.鄂尔多斯盆地延长组深水岩相发育特征及其石油地质意义[J].沉积学报,2013,31(5):928-938.FU Jinhua,DENG Xiuqin,CHU Meijuan,et al.Features of deepwater lithofacies,Yanchang Formation in Ordos Basin and its petroleum significance[J].Acta Sedimentologica Sinica,2013,31(5):928-938.
[20]魏巍,朱筱敏,朱世发,等.二连盆地额仁淖尔凹陷下白垩统云质岩致密油储层特征与成因[J].中国石油勘探,2017,22(3):71-80.WEI Wei,ZHU Xiaomin,ZHU Shifa,et al.Characteristics and origin of the Lower Cretaceous dolomitic tight oil reservoir in Erenaor sag,Erlian Basin[J].China Petroleum Exploration,2017,22(3):71-80.
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