区域油田地应力及井壁稳定性综合预测方法
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摘要
基于地质统计原理,提出一种综合利用地震和测井资料预测区域油田地应力和待钻井井壁稳定性的方法:首先利用测井和测试资料,精确计算已钻井处的地应力;同时,从三维地震记录中提取并优化地震属性,将油田地应力作为区域化变量,根据地震和测井信息之间良好的空间相关性,通过贝叶斯克里金方法,计算所研究区块的三维地应力数据体。在此基础上,利用井壁稳定力学模型,预测区块内待钻井的安全钻井液密度窗口,以有效控制钻井中的井壁失稳问题。油田实际应用表明,基于地质统计方法进行的区域油田地应力预测精确度较高,为进一步预测井壁稳定性提供了可靠依据。
This paper proposes a method,which can comprehensively predicts the regional in-situ stress of oilfield and borehole stability of undrilled well through the use of seismic data and logging data based on geostatistics theory.The in-situ stress of drilled well can be calculated precisely by using logging data and testing data.Meanwhile,the optimized seismic attributes can be extracted from 3D seismic records.With the in-situ stress of oilfield given as regionalized variables,the 3D in-situ stress data volume of the study area can be calculated according to the good spatial correlations between logging data and seismic data and by using Bayesian Kriging method.Safe drilling fluid density window of undrilled wells in the given area can be predicted through the use of the mechanical model of borehole stability so as to control the borehole instability during drilling.The prediction precision of regional in-situ stress of oilfield is satisfactory based on geostatistics,which can provide the reliable basis in future borehole stability prediction.
This paper proposes a method,which can comprehensively predicts the regional in-situ stress of oilfield and borehole stability of undrilled well through the use of seismic data and logging data based on geostatistics theory.The in-situ stress of drilled well can be calculated precisely by using logging data and testing data.Meanwhile,the optimized seismic attributes can be extracted from 3D seismic records.With the in-situ stress of oilfield given as regionalized variables,the 3D in-situ stress data volume of the study area can be calculated according to the good spatial correlations between logging data and seismic data and by using Bayesian Kriging method.Safe drilling fluid density window of undrilled wells in the given area can be predicted through the use of the mechanical model of borehole stability so as to control the borehole instability during drilling.The prediction precision of regional in-situ stress of oilfield is satisfactory based on geostatistics,which can provide the reliable basis in future borehole stability prediction.
引文
[1]梅松华,盛谦,冯夏庭,等.龙滩水电站左岸地下厂房区三维地应力场反演分析[J].岩石力学与工程学报,2004,23(23):4006-4011.Mei Songhua,Sheng Qian,Feng Xiating,et al.Back analysis of 3D in-situ stress field of underground powerhouse area of LongtanHydropower Station[J].Chinese Journal of Rock Mechanics andEngineering,2004,23(23):4006-4011.
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[10]樊洪海.适于检测砂泥岩地层孔隙压力的综合解释方法[J].石油勘探与开发,2002,29(1):90-92.Fan Honghai.A new integrated pore pressure evaluation method forshale-sand formations[J].Petroleum Exploration and Development,2002,29(1):90-92.
[11]李志明,张金珠.地应力与油气勘探开发[M].北京:石油工业出版社,1997:145-153.Li Zhiming,Zhang Jinzhu.In-situ stress and petroleum exploration andexploitation[M].Beijing:Petroleum Industry Press,1997:145-153.
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[13]Neves F A,Zahrani M S,Bremkamp S W.Detection of potentialfractures and small faults using seismic attributes[J].The LeadingEdge,2004,23(9):903-906.
[14]曾锦光,舒雅琴,钟勇.地震记录的分形和混沌性质[J].石油地球物理勘探,1995,30(6):743-748.Zeng Jinguang,Shu Yaqin,Zhong Yong.Fractal and chaoticcharacteristics of seismic data[J].Oil Geophysical Prospecting,1995,30(6):743-748.
[15]朱秋影,刘洪林,吴清岭,等.K-L变换在AVO交会图分析中的应用[J].石油地球物理勘探,2006,41(3):295-298.Zhu Qiuying,Liu Honglin,Wu Qingling,et al.Application of K-Ltransform in analysis of AVO crossplot[J].Oil Geophysical Prospecting,2006,41(3):295-298.
[16]金衍.井壁稳定预测理论及应用研究[D].北京:中国石油大学,2001.Jin Yan.Study on prediction theory and application of boreholestability[D].Beijing:China University of Petroleum,2001.
[2]邱祥波,李术才,李树忱.三维地应力回归分析方法与工程应用[J].岩石力学与工程学报,2003,22(10):1613-1617.Qiu Xiangbo,Li Shucai,Li Shuchen.3D geostress regression analysismethod and its application[J].Chinese Journal of Rock Mechanics andEngineering,2003,22(10):1613-1617.
[3]蒋中明,徐卫亚.三维初始地应力场反分析的径向基函数法[J].岩土力学,2002,23(6):737-741.Jiang Zhongming,Xu Weiya.3D back analysis of initial ground stressbased on ANN-RBF[J].Rock and Soil Mechanics,2002,23(6):737-741.
[4]金衍,陈勉,张旭东.钻前井壁稳定预测方法的研究[J].石油学报,2001,22(3):96-99.Jin Yan,Chen Mian,Zhang Xudong.Study on prediction forborehole stability before drilling[J].Acta Petrolei Sinica,2001,22(3):96-99.
[5]金衍,陈勉,杨小奇.利用层速度钻前预测安全钻井液密度窗口研究[J].岩石力学与工程学报,2004,23(14):2430-2433.Jin Yan,Chen Mian,Yang Xiaoqi.Prediction of safe mud densitywindow by interval velocity before drilling[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(14):2430-2433.
[6]金衍,陈勉.利用地震记录钻前预测井壁稳定性研究[J].石油学报,2004,25(1):89-92.Jin Yan,Chen Mian.Prediction of borehole stability by seismic records[J].Acta Petrolei Sinica,2004,25(1):89-92.
[7]Deutsch C V,Journel A G.GSLIB:Geostatistical software library anduser′s guide[M].New York:Oxford University Press,1997:9-18.
[8]More H.Bayesian kriging-merging observation and qualified guessesin Kriging[J].Mathematical Geology,1987,19(1):25-39.
[9]高美娟,朱庆忠,张淑华.利用贝叶斯-克里金估计技术进行储层参数预测[J].石油地球物理勘探,1999,34(4):390-397.Gao Meijuan,Zhu Qingzhong,Zhang Shuhua.Reservoir parameterprediction using the Bayes-Kriging estimation technique[J].OilGeophysical Prospecting,1999,34(4):390-397.
[10]樊洪海.适于检测砂泥岩地层孔隙压力的综合解释方法[J].石油勘探与开发,2002,29(1):90-92.Fan Honghai.A new integrated pore pressure evaluation method forshale-sand formations[J].Petroleum Exploration and Development,2002,29(1):90-92.
[11]李志明,张金珠.地应力与油气勘探开发[M].北京:石油工业出版社,1997:145-153.Li Zhiming,Zhang Jinzhu.In-situ stress and petroleum exploration andexploitation[M].Beijing:Petroleum Industry Press,1997:145-153.
[12]Chen Q,Sidney S.Seismic attribute technology for reservoirforecasting and monitoring[J].The Leading Edge,1997,16(5):445-456.
[13]Neves F A,Zahrani M S,Bremkamp S W.Detection of potentialfractures and small faults using seismic attributes[J].The LeadingEdge,2004,23(9):903-906.
[14]曾锦光,舒雅琴,钟勇.地震记录的分形和混沌性质[J].石油地球物理勘探,1995,30(6):743-748.Zeng Jinguang,Shu Yaqin,Zhong Yong.Fractal and chaoticcharacteristics of seismic data[J].Oil Geophysical Prospecting,1995,30(6):743-748.
[15]朱秋影,刘洪林,吴清岭,等.K-L变换在AVO交会图分析中的应用[J].石油地球物理勘探,2006,41(3):295-298.Zhu Qiuying,Liu Honglin,Wu Qingling,et al.Application of K-Ltransform in analysis of AVO crossplot[J].Oil Geophysical Prospecting,2006,41(3):295-298.
[16]金衍.井壁稳定预测理论及应用研究[D].北京:中国石油大学,2001.Jin Yan.Study on prediction theory and application of boreholestability[D].Beijing:China University of Petroleum,2001.
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