歧口凹陷中浅层泥岩蚀变校正方法
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摘要
歧口凹陷滨海海域的钻井液大部分采用水基泥浆。由于中浅层地层受钻井液浸泡的影响,泥岩发生蚀变,导致声波时差测井不能反映原状地层的速度信息,从而影响合成记录标定和井约束反演的效果。统计结果表明,随着水基泥浆对地层浸泡的时间增大,泥岩声波时差变大,速度降低。为此必需对泥岩蚀变进行校正,其校正思路是:在划分出砂泥岩剖面后,以受钻井泥浆浸泡时间较短的井作为标准井,按均值方差法将发生泥岩蚀变的井校正到标准井的分布范围内。泥岩蚀变校正结果表明,利用校正后的声波曲线所做合成记录与井旁实际地震记录对应关系更好,而且薄砂层的反演效果也得到了改善。
Water base mud in Qikou depression invades shales in the shallow formation,which leads to shale alteration and errors in acoustic logs that cannot reflect velocities of origin formations.So synthetic seismogram calibration and well-constrain inversion cannot be accurate.Statistics show that shale velocity decreases with the soak time.After dividing the sand and shale profile,mean and variance methods can be used to calibrate shale alteration basing on short time soak well as a reference.Applications reveal that synthetic seismogram calibration and reservoir inversion of thin sands are better with shale alteration corrected acoustic log.
Water base mud in Qikou depression invades shales in the shallow formation,which leads to shale alteration and errors in acoustic logs that cannot reflect velocities of origin formations.So synthetic seismogram calibration and well-constrain inversion cannot be accurate.Statistics show that shale velocity decreases with the soak time.After dividing the sand and shale profile,mean and variance methods can be used to calibrate shale alteration basing on short time soak well as a reference.Applications reveal that synthetic seismogram calibration and reservoir inversion of thin sands are better with shale alteration corrected acoustic log.
引文
[1]陈钢花,王永刚.水基泥浆的侵入对声波测井曲线的影响及校正.石油物探,2005,44(6):600～611Chen Gang-hua and Wang Yong-gang.The influenceand correction of water base mud on acoustic logging.GPP,2005,44(6):600～611
[2]朱家俊,张善文,王永诗等.水基钻井液浸泡对浅层声波测井的影响及校正方法.石油勘探与开发,2004,31(2):90～92Zhu Jia-jun,Zhang Shan-wen,Wang Yong-shi et al.Influence and correction of water-base mud drilling onacoustic logging of shallow formation.Petroleum Ex-ploration and Development,2004,31(2):90～92
[3]苏明军.声波、密度测井资料的环境影响分析及校正技术研究.天然气工业,2005,25(增刊B):101～103Su Ming-jun.Analysis and correction of ambiance in-fluence on sonic and density logging data.Natural GasIndustry,2005,25(Sup B):101～103
[4]谭茂金,范宜仁,张晋言.测井数据标准化方法研究及软件设计.物探化探计算技术,2006,28(3):219～223Tan Mao-jin,Fan Yi-ren,Zhang Jin-yan.Theory andsoftware design of log data normalization.ComputingTechniques for Geophysical and Geochemical Explo-ration,2006,28(3):219～223
[5]孟恩,徐刚,沈财余等.约束地震反演中测井数据的标准化及储层的精细标定.石油地球物理勘探,2005,40(2):226～232Meng En,Xu Gang,Shen Cai-yu et al.Standard oflogging data in constrained seismic inversion and finelabeling of reservoir.OGP,2005,40(2):226～232
[2]朱家俊,张善文,王永诗等.水基钻井液浸泡对浅层声波测井的影响及校正方法.石油勘探与开发,2004,31(2):90～92Zhu Jia-jun,Zhang Shan-wen,Wang Yong-shi et al.Influence and correction of water-base mud drilling onacoustic logging of shallow formation.Petroleum Ex-ploration and Development,2004,31(2):90～92
[3]苏明军.声波、密度测井资料的环境影响分析及校正技术研究.天然气工业,2005,25(增刊B):101～103Su Ming-jun.Analysis and correction of ambiance in-fluence on sonic and density logging data.Natural GasIndustry,2005,25(Sup B):101～103
[4]谭茂金,范宜仁,张晋言.测井数据标准化方法研究及软件设计.物探化探计算技术,2006,28(3):219～223Tan Mao-jin,Fan Yi-ren,Zhang Jin-yan.Theory andsoftware design of log data normalization.ComputingTechniques for Geophysical and Geochemical Explo-ration,2006,28(3):219～223
[5]孟恩,徐刚,沈财余等.约束地震反演中测井数据的标准化及储层的精细标定.石油地球物理勘探,2005,40(2):226～232Meng En,Xu Gang,Shen Cai-yu et al.Standard oflogging data in constrained seismic inversion and finelabeling of reservoir.OGP,2005,40(2):226～232
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