井控地震资料处理技术及其在LS地区的应用
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摘要
在塔里木盆地LS地区,泥盆系和志留系的地层圈闭和岩性圈闭是重要的勘探目标。然而,受地震资料分辨率的限制,这类圈闭的落实程度较低。为此,在LS地区开展了提高分辨率VSP井控地震资料处理技术研究。通过分析VSP资料,求取球面扩散振幅补偿因子;对VSP走廊叠加剖面与地震资料进行匹配分析。优选反褶积参数;通过分析零偏VSP资料,计算时变Q因子;对地震资料进行时空变Q分析,并由VSP资料进行校正,得到时变Q补偿因子。通过井控地震资料处理技术处理后的资料,分辨率有了较大提高,对砂岩尖灭点和志留系内幕的描述更加准确。
The strata and lithological traps of Devonian and Silurian are the exploration targets in LS area,Tarim Basin.However,the traps were poorly located due to the resolution limitation of seismic data.Therefore,VSP well control seismic data processing was in- vestigated and applied for improving resolution in LS area.By using VSP data,spherical spreading amplitude compensation factor was estimated.Matching analysis was carried out on the VSP corridor stack profiles and the seismic data to obtain optimum processing parameters for deconvolution.Time variant Q was calculated by analyzing zero-offset VSP data.Moreover,spatial-time variant Q analysis was applied in seismic data and the VSP data was used to correct it to get time variant Q compensation factor.The resolution of data after processed by well driven technology has been greatly improved and the sandstone pinch-out points and Silurian internal episode were described more accurately.
The strata and lithological traps of Devonian and Silurian are the exploration targets in LS area,Tarim Basin.However,the traps were poorly located due to the resolution limitation of seismic data.Therefore,VSP well control seismic data processing was in- vestigated and applied for improving resolution in LS area.By using VSP data,spherical spreading amplitude compensation factor was estimated.Matching analysis was carried out on the VSP corridor stack profiles and the seismic data to obtain optimum processing parameters for deconvolution.Time variant Q was calculated by analyzing zero-offset VSP data.Moreover,spatial-time variant Q analysis was applied in seismic data and the VSP data was used to correct it to get time variant Q compensation factor.The resolution of data after processed by well driven technology has been greatly improved and the sandstone pinch-out points and Silurian internal episode were described more accurately.
引文
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3云美厚，丁伟．地震子波频率浅析[J]．石油物探，2005，44(6)：578～581
4 Guo J,Wang Y H.Recovery of a target reflection un- derneath coal seams[J].Journal of Geophysics and En- gineering,2004,1(1):46～50
5 Wang Y H.Inverse Q-filter for seismic resolution en- hancement[J].Geophysics,2006,71(3):51～60
6郭建，王成彬，胡中平，等．Q补偿技术在提高地震分辨率中的应用——以准噶尔盆地Y1井区为例[J]．石油物探，2007，46(5)：509～513
7凌云．大地吸收衰减分析[J]．石油地球物理勘探，2001，36(1)：1～8
8赵殿栋，郭建，王咸彬．沙漠区低降速带地震波的吸收补偿方法研究与应用[J]．中国西部油气地质，2006，2 (3)：241～244
9周光泉，刘孝敏．粘弹性理论[M]．合肥：中国科学技术大学出版社，1996．1～234
10刘学伟，邰圣宏．用面波反演风化层Q值[J]．石油物探，1996，35(2)：89～95
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