纵、横波联合反演方法在海拉尔盆地贝39井区的应用
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摘要
海拉尔贝39井区构造复杂,砂体边界识别难,常规纵波地震解释存在多解性,引入转换波信息可增加地震解释的可靠性.由测井曲线的岩石物理分析可知,在纵波阻抗-速度比双弹性空间可识别砂泥岩.本文根据海拉尔地区测井资料的特点,利用拟合方法重构横波测井曲线;基于海拉尔贝39井区三维三分量地震数据,采用放大比例尺层拉平的精细层位解释及纵波降频和转换波提频相结合的方法进行精细层位匹配,在此基础上,由纵、横波联合反演求出速度比属性,定性描述了储层的平面分布,与贝39井钻遇油层特征相符,解决了该地区的油水分布问题.应用属性切片技术得到油层组的砂体平面展布,砂体的展布特征与区域地质认识的物源沉积方向具有较好的吻合程度,并对贝39井区的油藏类型进行了重新认识.
The structure in Bei39 zone of Hailar basin is complicated,it is difficult to identify the sand boundary,the conventional P-wave interpretation with multiple solutions,and the introduction of converted-wave seismic interpretation can increase the reliability of the seismic interpretation.The sand and shale can be distinguished in Zp-Vp/Vs double elastic spaces via the rock physics analysis.With the 3D3C data in Bei39 zone,based on the fine matching of PP and PS wave,the Vp/Vs attribute is obtained by joint inversion of PP and PS waves to characterize the reservoir qualitatively,which is accordance with the Bei39 reservoir as well as solving the problem how to recognize the Oil-water distribution.The sand planar distribution characteristic is obtained by using attribute slices,which has high similarity with the material deposition direction of the source via regional geological understanding,and the reservoir type of Bei39 zone is re-understood.
引文
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