喇嘛甸油田3D3C地震资料的应用探索

喇嘛甸油田在高含水开发后期剩余油精细挖潜研究中,面临密井网条件下厚度2m以上砂体的边界识别问题,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.基于喇嘛甸工区三维三分量地震数据,本文由测井曲线分析得出,密度、LR和MR能够很好地反映储层岩性变化.在纵波层位约束下的纵横波层位精细匹配解释基础上,由纵横波联合反演求出这3种属性数据体.井-震结合,应用属性切片技术得到不同小层的砂体平面展布,与钻井绘制的沉积相图具有较高的一致性,并在气藏描述、砂体识别、河道刻画中见到显著的地质效果.该研究为喇嘛甸油田主力油层剩余油挖潜研究提供了基础资料,同时展示了该区扶余油层的良好勘探前景.     

PP-PS协同反演技术预测大庆深层火山岩含气储层

徐深气田深层火山岩含气储层含气检测尚缺乏有效的方法,传统的纵波反演由于反演过程中仅仅使用单个模型的波,反演结果存在多解性.PP、PS联合反演方法较好地解决了多解性难题,反演结果比较稳定,可信度较高.通过在大庆深层火山岩探区采集2D3C多波资料,并进行处理技术攻关,综合利用测井、VSP等资料,利用PP、PS联合反演技术进...     

气层在纵波和转换波谱分解中的特征

应用拟合追逐分解MPD(Matching pursuit decomposition)法对地震数据进行谱分解能够提供更好的分辨率,在时间分辨率和频率分辨率上到达一致,避免付氏变换方法中时窗大小选择和分析时间点不准确的问题。含气地层对纵波资料产生较大的频率衰减,在储层下方可能见到低频强振幅的低频阴影现象。而转换波资料受气藏影响小,在转换波剖面中不会出现同纵波类似的低频阴影区。因此,综合两种资料在分频剖面上的表现,可以进行含气性异常的预测。对已知气藏的实际多波地震资料,进行MPD分频处理,在不同波场的分频剖面上,分析气层响应特征。     

The gas reservoir response in PP- and PS-wave frequency sections

Spectral decomposition using the method of Matching Pursuit Decomposition （MPD） for PP- and PS-wave data has higher resolution and higher consistency over the entire time-frequency plane. The MPD algorithm avoids the problems of inaccurate analytic time point and the time window size choice that may occur during a Fourier transform. The PP-wave attenuation is greater than the PS-wave attenuation while propagating through gas reservoirs. There are some stronger amplitude low-frequency shadows on the PP-wave single frequency sections beneath gas reservoirs which are not seen on corresponding PS- wave single frequency sections. Therefore, hydrocarbons are predicted from comparing the behavior on both frequency sections. The time-frequency analysis for multi-component data is decomposed by MPD for data from northeast China containing rich gas reservoirs. The gas response character is analyzed on different wave mode single frequency sections. We describe the MPD algorithm, compare it to other spectral decomposition methods, and show some examples of detecting low-frequency shadows beneath gas reservoirs.