大庆油田M1井3D VSP成像方法与应用

Imaging approach and application of 3D VSP seismic data in well M1 in Daqing oilfield

3D VSP地震数据具有高分辨率和高信噪比的特点,常规的VSP成像方法在大庆油田资料的处理中一直未见到理想的效果.依据大庆油田VSP资料的特点,设计了3D VSP资料的处理流程,主要包括三分量波场逐点定向方法和Q补偿的子波反褶积等预处理方法,所设计的流程具有高分辨率、高保真性的特点.大庆油田M1井的实际资料处理结果显示,所形成的方法可将VSP资料的频带展宽约20 Hz,同时对地面地震也进行了反褶积处理,反褶积后,地面地震的分辨率得到有效提高,波组特征更加清楚.实际数据计算表明,所形成的方法具有很好的实用性,可实现地下介质的精细刻画,可在具有同类地质条件的研究区推广应用.

3D VSP seismic exploration has the characteristics of high resolution and high signal to noise ratio.There is no ideal effect of processing the VSP data with conventional image methods in Daqing Oilfield.According to the VSP data feature in Daqing oil field,we designed a process flow of 3D VSP data,mainly including rotation directional of three-component wavefield,Q compensation wavelet deconvolution method and other pre-process methods.The work flow we proposed has high resolution and high fidelity.The processing result of field data in well Ml in Daqing Oilflield showed that our method could broadening the VSP data band about 20 Hz.In the mean time,we also carried on the deconvolution processing on the ground seismic data.And after the deconvolution,the resolution had a effective improvement,wave group characteristics was more clear.The calculation of field data indicated that our method has good practicability,it can implement the fine features of underground medium,and the method can be extensively applied in the research areas which have the same kind geological conditions.