优势角度叠加数据在复杂断块油田地震解释中的应用

Application of advantage angle stack data to seismic interpretation of complicated fault oil field

利用优势角度叠加的高分辨率数据,识别复杂断块油田储集层的隔层,与敏感角度相结合进行广义弹性阻抗反演。复杂断块油田储集层连通性复杂,叠前道集上的大角度资料由于受地震信号传播、处理等因素的影响,资料品质、波形特征常常发生较大的改变,全叠加地震资料受大角度资料的干扰,不利于地震特征分析及储层预测。为此,对叠前偏移距道集品质进行分析,利用入射角与偏移距的关系获得叠前道集上的入射角信息,并有效利用目的层最佳成像角度带,完成优势角度叠加。克服了大角度数据影响的优势角度叠加数据具有更高的分辨率,可以识别出储集层的隔层。优势角度与敏感角度相结合的广义弹性阻抗反演结果可以有效地对砂体分布进行预测。

Using high-resolution data obtained by advantage angle stack,the authors recognize the restraining barrier of the complicated fault oil field reservoir,and carry on the generalized elastic impedance inversion combined with the sensitive angles.The connectivity of the complicated fault oil field reservoir is complicated.Due to effects of the seismic signal propagation,processing and other factors,the quality and waveform characteristics of the large-angle data of the pre-stack gather often change greatly.The full stack seismic data are interfered by the large-angle data.This is not favorable for the seismic characteristics analysis and reservoir prediction.To this end,by the pre-stack offset gather quality analysis and using the relationship between the angle of incidence and offset,the authors get the information of the angle of incidence,and complete the advantage angle stack by effectively use of the best imaging angle range of the target layer.The data of the advantage angle stack which overcome effects of the large-angle data have higher resolution and can recognize the restraining barrier of the reservoir.The results of the generalized elastic impedance inversion by combining the advantage angle with the sensitive angle can effectively predict the distribution of sand bodies.