波阻抗反演技术在孤东地区馆陶组薄储层描述中的应用
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摘要
根据一维波动方程的拟合迭代法原理 ,给出了求解波阻抗σ(x)的算法。针对孤东地区馆陶组薄储层油藏存在的地层埋深浅、较疏松以及井径变化大泥岩中含有膨化矿物蒙脱石等引起的声波测井速度失真问题 ,采用分段函数法对其进行了校正。将校正后的声波资料进行反演 ,可得到高质量的资料 ,用该校正资料追踪描述的储层与录井结果吻合较好。应用结果表明 ,测井资料在反演中可以补充地震资料缺少的低频和高频分量 ,地震波阻抗反演技术是薄储层描述的有效方法
The principle of fitting iteration method for one-dimensional wave equation was discussed, and an algorithm for calculating wave impedance value was presented. The log data was used to compensate the low and high frequency components lacked in seismic data. The distortion of logging velocity in the thin reservoir of Guantao Group in Gudong area happened because of shallower buried depth of formation, relatively unconsolidated formation, larger variation in well diameter and mudstone mixed with montmorillonite (a kind of bulking mineral). A piecewise function method was adopted to correct the distortion of logging velocity, and the high-level sonic log data were obtained. The corrected logging data were applied to wave impedance inversion, the high-level data could be obtained, and the reservoir features traced and described by using corrected data were in good agreement with the logging results. The application example shows that the seismic wave impedance inversion is an efficacious method for describing the thin reservoir in this case.
The principle of fitting iteration method for one-dimensional wave equation was discussed, and an algorithm for calculating wave impedance value was presented. The log data was used to compensate the low and high frequency components lacked in seismic data. The distortion of logging velocity in the thin reservoir of Guantao Group in Gudong area happened because of shallower buried depth of formation, relatively unconsolidated formation, larger variation in well diameter and mudstone mixed with montmorillonite (a kind of bulking mineral). A piecewise function method was adopted to correct the distortion of logging velocity, and the high-level sonic log data were obtained. The corrected logging data were applied to wave impedance inversion, the high-level data could be obtained, and the reservoir features traced and described by using corrected data were in good agreement with the logging results. The application example shows that the seismic wave impedance inversion is an efficacious method for describing the thin reservoir in this case.
引文
[1] 李庆忠.走向精确勘探的道路高分辨率地震勘探系统工程剖析[M ].北京:石油工业出版社,1993.121-133.
[2] 张繁昌,印兴耀.用模拟退火神经网络技术进行波阻抗反演[J].石油大学学报(自然科学版),1997,21(6):16-18,23.
[3] 梁光河.多井约束随机逆波阻抗反演研究[J].石油地球物理勘探,1998,33(2),151-160.
[4] 张向君,李幼铭.地震道的井约束混沌控制反演[J].石油地球物理勘探,1999,34(1):8-13.
[5] 林小竹,钱绍新.波阻抗映射法外推[J].地球物理学报,1998,41(1):109-116.
[6] 宋传春,李来运.多井约束反演在车西洼陷薄层岩性油气藏勘探中的应用[J].勘探家(石油与天然气),1998,3(2):36-38.
[7] 陈刚,曲志浩.博士庄地区下第三系油藏描述与评价[J].石油学报,1998,19(4):30-34.
[2] 张繁昌,印兴耀.用模拟退火神经网络技术进行波阻抗反演[J].石油大学学报(自然科学版),1997,21(6):16-18,23.
[3] 梁光河.多井约束随机逆波阻抗反演研究[J].石油地球物理勘探,1998,33(2),151-160.
[4] 张向君,李幼铭.地震道的井约束混沌控制反演[J].石油地球物理勘探,1999,34(1):8-13.
[5] 林小竹,钱绍新.波阻抗映射法外推[J].地球物理学报,1998,41(1):109-116.
[6] 宋传春,李来运.多井约束反演在车西洼陷薄层岩性油气藏勘探中的应用[J].勘探家(石油与天然气),1998,3(2):36-38.
[7] 陈刚,曲志浩.博士庄地区下第三系油藏描述与评价[J].石油学报,1998,19(4):30-34.
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