五号桩洼陷沙二段储层叠前地震识别

The research of the prestack seismic identification of the reservoirs in Es_2 of Wuhaozhuang sag

五号桩洼陷沙二段储层在地震成果剖面上包含在T2强反射轴中,受T2强反射的"屏蔽"影响表现为弱反射特征,无法利用常规储层描述方法对其进行描述。本文通过地震岩石物理基础分析,在明确T2强反射轴地质意义的基础上,计算不同岩性组合界面的AVO曲线,从理论上证实,通过利用部分角叠加剖面,T2反射轴的变化可以实现对沙二段储层的地震识别,并通过对五号桩高精度三维地震资料的部分角叠加处理实现了利用实际地震道集的部分角叠加剖面对沙二段储层的地震识别。

The reservoirs in Es2 of Wuhaozhuang sag are included in T2 strong reflection on the final seismic result sections, the reservoirs can not be described by conventional reservoir description methods as they showed poor reflections affected by T2 strong reflection. It is theoretically confirmed that the reservoirs in Es2 can be indentified by the changes of partial angle stack section based on the analysis of seismic rock physics and different lithologic association interfacial AVO curve calculation. The reservoirs in Es2 were identified by partial angle stack sections of the real seismic gathering through the processing of the partial angle stack of the high precision 3D seismic data acquired from Wuhaozhuang.