地震DNA地层超剥点线识别技术及应用

Stratigraphic pitching-out point and line identification technology based on seismic DNA and its application

地层油藏超剥点线的地球物理精细描述有利于提高含油气储层识别的可靠性和钻井成功率,但在地震描述中根据地震反射特征追踪的超剥点线与实际地层油藏的超剥点线往往存在较大的误差。介绍了地震DNA地层超剥点线识别技术的方法原理与实现步骤,通过将地震反射数据和蚂蚁体属性数据转换成相应的字符数据,采用地震DNA搜索方法将对应字符所表示的地震数据体中的超剥点识别出来。在此基础上,应用聚类算法将超剥点进行合理连线得到地层超剥线。模型合成地震记录的超剥点识别结果表明,地震DNA地层超剥点识别技术能够有效识别出超剥点,与传统瞬时相位识别的超剥点相比,该方法的识别精度更高。东营凹陷草桥地区的实际应用表明,该技术可以更加有效地描述超剥点线,实现了该区低序级不整合超剥边界的精细刻画,比基于瞬时相位属性描述的超剥线的识别精度明显提高。

The geophysical description of pitching-out point and line in stratigraphic reservoir is beneficial to improve the reliability of oil and gas reservoir recognition and success rate of well drilling.The pitching-out point and line is traced by seismic reflection characteristics.There is a large difference between the pitching-out point and line and the actual point and line.In this paper we introduce the method principle and implementation steps of stratigraphic pitching-out point and line identification technology based on seismic DNA.The seismic reflection data and ant-attribute data is converted into the corresponding character data,and then the pitching-out point from the character data indicated corresponding seismic data is identified using seismic DNA.On the basis,stratigraphic pitching-out points are reasonably linked to be the pitching-out line by using clustering.Model simulated records show that stratigraphic pitching-out point and line identification technology based on seismic DNA can effectively identify pitching-out point,and can improve the identification precision compared with the result of conventional instantaneous phase.The application result of actual data in Caoqiao area,Dongying depression shows that this technology can effectively describe pitching-out line and the fine description of the unconformity pitching-out boundary for thin layer is realized.