薄互层油气藏AVO特征模拟分析
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摘要
通过求解基于点震源的完全弹性和粘弹性波动方程获取地震波场完全解(包括了一次反射波、多次反射波和转换波信息),有效消除了高阻抗条件和临界角条件下基于射线追踪计算反射系数的误差。利用该方法研究了薄层厚度、层间多次波和衰减等因素对薄互层油气藏地震AVO变化规律的影响,其结论与认识可为利用地震AVO进行薄互层油气藏识别提供理论依据。
The whole solutions of seismic wave field(including primary wave,multiple reflected wave and converted wave) can be obtained through solving the equations of full elastic and viscoelastic waves based on a point source,which effectively eliminates the reflection coefficient error from ray-traceing calculation under a high impedance and the critical angle.This method has been used to probe into the impacts of several factors such as thin bed thickness,interbed multiples and attenuation on AVO patterns in thin-interbedded reservoirs,the results and conceptions from which can provide a theoretical evidence for recognizing thin-interbedded reservoirs by seismic AVO.
The whole solutions of seismic wave field(including primary wave,multiple reflected wave and converted wave) can be obtained through solving the equations of full elastic and viscoelastic waves based on a point source,which effectively eliminates the reflection coefficient error from ray-traceing calculation under a high impedance and the critical angle.This method has been used to probe into the impacts of several factors such as thin bed thickness,interbed multiples and attenuation on AVO patterns in thin-interbedded reservoirs,the results and conceptions from which can provide a theoretical evidence for recognizing thin-interbedded reservoirs by seismic AVO.
引文
[1]云美厚,丁伟,王新红.陆相薄互层油藏四维地震监测存在的问题与建议[J].石油地球物理勘探,2005,40(4):444-450.
[2]LI J,CHEN X,ZHAO W.Study on time-lapse seism ic AVO of finelayering porous unconsolidated reservoir[C].SEG InternationalExposition and74thAnnualMeeting,2004:2299-2302.
[3]赵伟,陈小宏,李景叶.薄互层调谐效应对AVO的影响[J].石油物探,2006,45(6):570-573.
[4]OSTRANDER W.P lane-wave reflection coefficients for gas sandsat nonnormal angles of incidence[J].Geophysics,1984,49(6):1637-1648.
[5]徐仲达,屠浩敏,邬庆良.平面波反射系数与AVO技术[J].石油物探,1991,30(3):1-20.
[6]MARTIN T,SERGE I A,PETER H.AVO correction for scalerwaves in the case of a th in ly layered reflector overburden[J].Geophysics,1996,61(2):520-528.
[7]LIU Y,SCHM ITT D R.Amplitude and AVO responses of a singleth in bed[J].Geophysics,2003,68(4):1161-1168.
[8]MARMALYEVSKYY N,ROGANOV Y.Frequency depend ingAVO for a gas-saturated period ical th in-layered stack[C].SEGInternational Exposition and76thAnnual M eeting,2006:274-278.
[9]ELLISON S J,IMHOFM G,CORUH C,et al.Modeling offset-de-pendent reflectivity for tim e-lapse mon itoring of water-flood pro-duction in th in-layered reservoirs[J].Geophysics,2005,69(1):25-36.
[10]KENNETT B.Reflections,rays and reverberations[J].Bu lletin ofthe Seismological Society ofAm erica,1974,64(6):1685-1696.
[11]KENNETT B.Theoretical reflection seismogram s for elastic m ed ia[J].Geophysical Prospecting,1979,27:301-321.
[2]LI J,CHEN X,ZHAO W.Study on time-lapse seism ic AVO of finelayering porous unconsolidated reservoir[C].SEG InternationalExposition and74thAnnualMeeting,2004:2299-2302.
[3]赵伟,陈小宏,李景叶.薄互层调谐效应对AVO的影响[J].石油物探,2006,45(6):570-573.
[4]OSTRANDER W.P lane-wave reflection coefficients for gas sandsat nonnormal angles of incidence[J].Geophysics,1984,49(6):1637-1648.
[5]徐仲达,屠浩敏,邬庆良.平面波反射系数与AVO技术[J].石油物探,1991,30(3):1-20.
[6]MARTIN T,SERGE I A,PETER H.AVO correction for scalerwaves in the case of a th in ly layered reflector overburden[J].Geophysics,1996,61(2):520-528.
[7]LIU Y,SCHM ITT D R.Amplitude and AVO responses of a singleth in bed[J].Geophysics,2003,68(4):1161-1168.
[8]MARMALYEVSKYY N,ROGANOV Y.Frequency depend ingAVO for a gas-saturated period ical th in-layered stack[C].SEGInternational Exposition and76thAnnual M eeting,2006:274-278.
[9]ELLISON S J,IMHOFM G,CORUH C,et al.Modeling offset-de-pendent reflectivity for tim e-lapse mon itoring of water-flood pro-duction in th in-layered reservoirs[J].Geophysics,2005,69(1):25-36.
[10]KENNETT B.Reflections,rays and reverberations[J].Bu lletin ofthe Seismological Society ofAm erica,1974,64(6):1685-1696.
[11]KENNETT B.Theoretical reflection seismogram s for elastic m ed ia[J].Geophysical Prospecting,1979,27:301-321.
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