利用地震资料估算地层速度的精度分析
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摘要
为了了解利用地震数据进行地层速度估算的适用性和可靠性,依据大港油田的测井数据和地质特征设计了一个典型地质模型。通过对正演模拟叠前地震波场的速度分析,讨论了地震速度分析误差对地层速度的影响,在此基础上,对实际地震速度与测井速度进行了分析对比。发现在将地震速度转换为层速度过程中,地震速度分析的误差被放大,这种放大效应会严重降低利用地震速度进行岩性检测的精度和可靠性。
In order to understand the applicability and reliability of formation velocity estimation by seismic data,a typical geologic model was designed according to logging data and geologic characteristics of Dagang Oilfield.The influence of seismic velocity analysis error on formation velocity was discussed by velocity analysis on the forward simulated pre-stack seismic wavefield.On the basis,the seismic velocity and logging velocity were analyzed and compared.It is found that,during conversing seismic velocity into layer velocity, the error of seismic velocity analysis is amplified,this kind of amplification seriously decreases the accuracy and reliability of lithologic detection by seismic velocity.
In order to understand the applicability and reliability of formation velocity estimation by seismic data,a typical geologic model was designed according to logging data and geologic characteristics of Dagang Oilfield.The influence of seismic velocity analysis error on formation velocity was discussed by velocity analysis on the forward simulated pre-stack seismic wavefield.On the basis,the seismic velocity and logging velocity were analyzed and compared.It is found that,during conversing seismic velocity into layer velocity, the error of seismic velocity analysis is amplified,this kind of amplification seriously decreases the accuracy and reliability of lithologic detection by seismic velocity.
引文
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2刘洪文.含油气地层地震响应特征分析[J].石油物探, 2008,47(6):577-582
3 Yang J H,Li G F,Liu Y,et al.The application of elastic impedance inversion in reservoir prediction at the Jinan area of Tarim Oilfield[J].Applied Geophysics, 2007,4(3):201-206
4牟永光,陈小宏,李国发,等.地震数据处理方法[M].北京:石油工业出版社,2007.140-142
5张敏,李振春.偏移速度分析与建模方法综述[J].勘探地球物理进展,2007,30(6):421-427
6潘宏勋,方伍宝.地震速度分析方法综述[J].勘探地球物理进展,2006,29(5):305-332
7胡英,张研,陈立康,等.速度建模的影响因素与技术对策[J].石油物探,2006,45(5):503-507
8李国发,廖前进,王尚旭,等.合成地震记录层位标定若干问题的探讨[J].石油物探,2008,47(2):145-149
9张保银,孙建国,黄伟传,等.塔中地区速度场建立及变速成图[J].石油物探,2004,43(6):608-611
10 Li G F,Xiong J L,Zhou H,et al.Seismic reflection characteristics of fluvial sand and shale interbedded layers[J].Applied Geophysics,2008,5(3):219-229
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