淡水水淹过程中自然电位基线偏移随含水率变化规律
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摘要
当油层被淡水水淹时,自然电位基线的偏移是定性识别水淹层的重要依据。以测井和油藏工程相关知识为基础,推导出淡水水淹过程中自然电位基线偏移量与含水率的定量关系。研究结果表明:①在含水率相同的条件下,注入水电阻率与原始地层水电阻率的比值越大,基线偏移量越大;②在未水淹期、弱水淹期、中水淹期及强水淹期自然电位基线偏移量随含水率的变化分别表现为基本不变、快速上升、直线上升、缓慢上升。将该方法应用于S油田的含水率及水淹级别的评价时,符合率达82.6%。
In freshwater flooding process,the spontaneous potential baseline shift is an important indicator for qualitative identification of water flooding zone.Based on the spontaneous potential theory,water-cut and relative permeability theory,the quantitative relationship between shale baseline shift and water-cut is deeply studied.The study results show that:(1)if the water-cut of two oil reservoirs is the same,the one which has higher resistivity ratio of injected water and original formation water has bigger spontaneous potential(SP)baseline shift;(2)the characteristic of SPbaseline shift is different for different water flooding grade.In non-water-flooding period,the SPbaseline almost has no shift,and in weak water-flooding period,the amplitude of SPbaseline shift rises rapidly,and in mid-water-flooding period,there is a liner relationship between SPbaseline shift and water-cut,and in strong water-flooding period,the amplitude of SPbaseline shift rises very slowly.In this paper,the quantitative relationship is applied in S oilfield to determine the water flooding grade and the coincident rate reaches to 82.6%.
In freshwater flooding process,the spontaneous potential baseline shift is an important indicator for qualitative identification of water flooding zone.Based on the spontaneous potential theory,water-cut and relative permeability theory,the quantitative relationship between shale baseline shift and water-cut is deeply studied.The study results show that:(1)if the water-cut of two oil reservoirs is the same,the one which has higher resistivity ratio of injected water and original formation water has bigger spontaneous potential(SP)baseline shift;(2)the characteristic of SPbaseline shift is different for different water flooding grade.In non-water-flooding period,the SPbaseline almost has no shift,and in weak water-flooding period,the amplitude of SPbaseline shift rises rapidly,and in mid-water-flooding period,there is a liner relationship between SPbaseline shift and water-cut,and in strong water-flooding period,the amplitude of SPbaseline shift rises very slowly.In this paper,the quantitative relationship is applied in S oilfield to determine the water flooding grade and the coincident rate reaches to 82.6%.
引文
[1]张庚骥.电法测井[M].东营:石油大学出版社,2003.
[2]柯若伯列夫.油田开发中的地球物理检测方法[M].楚泽涵,郝志兴,译.北京:石油工业出版社,1994.
[3]Segesman F.New SP correction charts[J].Geophysics,1962,6:815-828.
[4]雍世和,张超谟.测井数据处理与综合解释[M].东营:中国石油大学出版社,2002.
[5]潘克家,谭永基.复杂地层中自然电位测井的高效数值模拟[J].石油地球物理勘探,2009,44(3):371-376.
[6]李先鹏,张善成,杨克兵.水淹层自然电位实验测量及结果分析[J].江汉石油学院学报,1998,20(1):41-44.
[7]侯连华.自然电位基线偏移影响因素的实验研究[J].石油大学学报:自然科学版,2001,25(1):93-95,98.
[8]赵培华.油田开发水淹层测井评价技术[M].北京:石油工业出版社,2003.
[9]田中元,穆龙新,孙德明,等.砂砾岩水淹层测井特点及机理研究[J].石油学报,2002.23(6):50-55.
[10]Pan K J,Tan Y J,Hu H L.Mathematical model and numerical method for spontaneous potential log in heterogeneous formations[J].Applied Mathematics and Mechanics,2009,30(2):209-219.
[11]赵文杰.水淹层岩石电阻率特征的实验研究[J].油气采收率技术,1995,2(4):32-39.
[12]何更生,唐海.油层物理[M].北京:石油工业出版社,2011.
[2]柯若伯列夫.油田开发中的地球物理检测方法[M].楚泽涵,郝志兴,译.北京:石油工业出版社,1994.
[3]Segesman F.New SP correction charts[J].Geophysics,1962,6:815-828.
[4]雍世和,张超谟.测井数据处理与综合解释[M].东营:中国石油大学出版社,2002.
[5]潘克家,谭永基.复杂地层中自然电位测井的高效数值模拟[J].石油地球物理勘探,2009,44(3):371-376.
[6]李先鹏,张善成,杨克兵.水淹层自然电位实验测量及结果分析[J].江汉石油学院学报,1998,20(1):41-44.
[7]侯连华.自然电位基线偏移影响因素的实验研究[J].石油大学学报:自然科学版,2001,25(1):93-95,98.
[8]赵培华.油田开发水淹层测井评价技术[M].北京:石油工业出版社,2003.
[9]田中元,穆龙新,孙德明,等.砂砾岩水淹层测井特点及机理研究[J].石油学报,2002.23(6):50-55.
[10]Pan K J,Tan Y J,Hu H L.Mathematical model and numerical method for spontaneous potential log in heterogeneous formations[J].Applied Mathematics and Mechanics,2009,30(2):209-219.
[11]赵文杰.水淹层岩石电阻率特征的实验研究[J].油气采收率技术,1995,2(4):32-39.
[12]何更生,唐海.油层物理[M].北京:石油工业出版社,2011.