徐家围子断陷区二维三分量地震资料解释研究

2-D three-component seismic data interpretation in Xujiaweizi rift area

（中国石油大庆石油管理局钻探集团地球物理勘探公司，黑龙江大庆163357）

Daqing Geophysical Exploration Company, CNPC, Daqing 163357, China

松辽盆地北部徐家围子断陷区深层营城组砂砾岩层和火山岩层是大庆探区庆深气田的主力含气储层，但含气性的精确预测一直是一个难点。为此，开展了二维三分量地震资料解释研究，建立了适合本区的解释流程，联合应用纵波和转换波资料对营城组储层的含气性进行了预测。首先探讨了转换波的层位标定问题，制作了转换波合成记录，以VSP资料为辅佐，对转换波资料进行了层位标定；然后进行了层位对比解释，分析了储层在纵波和转换波剖面上的反射特征；最后，计算了对含气性敏感的绝对振幅平均能量加权平均比值（振幅比）和瞬时频率加权平均比值（频率比），得到了振幅比相对低、频率比变化剧烈时含气性好的认识。

The gravel-stone and volcanic rock strata of Yingcheng Group in Xujiaweizi rift area are the dominant gasbearing reservoirs in Qingshen gas field in the northern Songliao basin. However, the accurate prediction is always a difficulty. So, the three component seismic data was studied and the interpretation flow suitable to the area was built. The joint application of P and PS wave was used to predict the gas-bearing reservoirs in Yingcheng group. Firstly, the horizon calibration problem of PS wave was discussed and the synthetic seismogram of PS wave was created. The horizon calibration of PS wave was realized through the assistance of VSP data. Then, horizon comparison was carried out and the reflection characteristics of reservoirs in P and PS sections were analyzed. Finally, the amplitude ratio and the frequency ratio sensitive to the bearinggas characteristics were calculated, showing that the relatively low amplitude ratio and serious altered frequency ratio is the label of good gas bearing reservoir.