滨5区块井间地震资料处理及效果
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摘要
滨5区块的沙三段主要含油层系为砂砾岩体岩性油藏,砂体横向变化快、层间物性差异大,储层描述难度大,由于常规三维地震资料分辨能力难以满足砂体精细描述的要求,因此在该区实施了高分辨率的井间地震技术来提高砂体描述精度。针对原始资料特点,利用高精度层析成像和基于映射叠加的叠前深度偏移成像等关键处理技术获取了高分辨率的偏移成像剖面,对井间地震成果剖面进行解释,落实了井间低序级断层和储层横向连通性,建立了更加精细的油藏地质模型,提高了储层描述精度。
The oil reservoir of the Es3 in Bin 5 block is dominated by sandstone and conglomerate.The sandstone varies rapidly in horizontal direction.Large differences occur in physical properties between layers that made the reservoir description very difficult.Since the resolution of conventional 3D surface seismic data does not allow the fine description of the sand body,we have to apply the cross-well seismic technique with high resolution ratio to improve the precision of sandbody description in this block.According to the characteristics of field data,we adopted some key processing technology,such as the high precision tomography and pre-stack depth migration based on mapping to obtain high-resolution cross-well imaging profiles.Interpretation was made for the cross-well seismic profiles to reveal the low-grade faults and the lateral reservoir connectivity between two wells.Upon the basis,we establish a better reservoir geological model to improve the precision of reservoir description.
The oil reservoir of the Es3 in Bin 5 block is dominated by sandstone and conglomerate.The sandstone varies rapidly in horizontal direction.Large differences occur in physical properties between layers that made the reservoir description very difficult.Since the resolution of conventional 3D surface seismic data does not allow the fine description of the sand body,we have to apply the cross-well seismic technique with high resolution ratio to improve the precision of sandbody description in this block.According to the characteristics of field data,we adopted some key processing technology,such as the high precision tomography and pre-stack depth migration based on mapping to obtain high-resolution cross-well imaging profiles.Interpretation was made for the cross-well seismic profiles to reveal the low-grade faults and the lateral reservoir connectivity between two wells.Upon the basis,we establish a better reservoir geological model to improve the precision of reservoir description.
引文
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[2]陈世军,周建宇,王延光,等.井间地震技术在樊124井区的应用[J].石油物探,2003,42(3):369-373.
[3]孔庆丰,王延光,左建军,等.垦71区块井间地震资料处理研究与应用[J].物探与化探,2008,32(2):175-179.
[4]左建军,林松辉,孔庆丰,等.井间地震技术在永新地区的应用[J].物探与化探,2009,33(5):556-561.
[5]左建军.Wavetracing层析成像方法及其在井间地震中的应用[J].勘探地球物理进展,2005,29(5):329-332.
[6]魏国华.井间地震POSTMAP偏移成像研究及应用[J].勘探地球物理进展,2005,29(5):322-325.
[7]曹辉,唐金良,郭全仕,等.井间地震反射波场分离及应用研究[J].石油物探,2004,43(6):518-522.
[8]郭全仕,邬达理,唐金良,等.井间地震反射波成像技术探讨[J].石油物探,2005,44(5):439-444.
[9]Lazaratos S K,Marion B P.Crosswell seismic imaging ofreservoir changes caused by CO2injection[J].The LeadingEdge,1997,16(9):1 300-1 306.
[10]Byun J,Rector J W,Nemeth T.Postmap migration of cr-osswell reflection seismic data[J].Geophysics,2002,67(1):135-136.
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