断层自动拾取技术在大布苏地区地震资料解释中的应用

Application of automatic fault extraction technique on seismic data interpretation in Dabusu area

传统三维地震资料断层解释是从三维地震资料中抽取数条二维测线进行单线解释,同时参考时间切片,利用测线与切片相互闭合这一关系,进行人工断层解释。断层自动拾取技术立足于三维相干数据体,根据相干数据体中断层倾角和方位角的变化,采用线性处理和断层矢量加强处理方法消除噪声,突出断层特征。通过水平和垂直断层矢量的自动组合,在三维可视化环境下实现断层自动拾取。应用断层自动拾取技术对松辽盆地南部大布苏地区的三维地震数据进行了断层解释,确定了断层的展布形态和断层之间的接触关系。

Traditional 3-D seismic data interpretation is a 2D interpretation based on 3D seismic data.Faults are picked from seismic sections along inline or crossline,in the mean time take time-slices as reference.Coherence data is just used to verify fault interpretation result.Automatic Fault Extraction is a process designed to automatically interpret fault surfaces from 3-D seismic discontinuity volumes according to its dip & azimuth changes in coherence data. Several processing steps are applied to the discontinuity volume to improve the imaging of fault surfaces,followed by processes to automatically track the fault lineaments on vertical and horizontal slices through the volume.Fault Extraction technique is applied to fault interpretation at Dabusu complex structure zone in southern SongLiao basin.Tiny faults are identified exactly,faults shape and faults contact is also ascertained clearly,fracture system is analysed rightly under 3D Visualization environment.That availably directs petroleumn exploration and deployment in Dabusu zone.