论文详情
受采集因素制约,实际海底电缆地震数据覆盖次数是不均匀的,需要进行规则化处理。海洋地震数据的规则化处理通常在共偏移距数据体上进行,会丢失方位角信息,如果使用扇区划分的方式保留方位角信息,则面临覆盖次数不足的问题。海底电缆数据方位较宽,不适合使用这种方法进行规则化,为此将海底电缆数据划分成共炮检距矢量数据体进行数据规则化,共炮检距矢量数据体是在offset-x和offset-y两个方向按照矩形划分的数据体,这种划分方式在限定偏移距和方位角范围条件下定义了地下面元的一次覆盖。相对于共偏移距数据体和分扇区划分,共炮检距矢量体面元内覆盖次数更均匀,方位角更接近,对共炮检距矢量数据体进行面元中心化处理,能有效保留方位信息,同时插值精度更高。乌石工区三维海底电缆数据COV插值实际应用结果证明了该方法对海底电缆数据插值的可靠性。
Because of the acquisition factors,the fold of ocean bottom cable (OBC) seismic data is uneven,and it needs to be regularized.Conventional regularization of marine seismic data was processed in common offset volume,but which will lose azimuth information;if the sector division was used to keep azimuth information,the fold is lacking.The azimuth of OBC seismic data is wider,and is not suitable to be regularized by the above conventional method.Therefore,we propose a new method which should divide the OBC seismic data into common offset vector (COV) volume and then to be regularized.The division of COV volume is according to the rectangle in offset-x and offset-y,common offset vector domain defined one fold of subsurface covering bin under the condition of limited offset and azimuth range.Relative to the common offset data volume and sector division,the fold of this method is more even and the azimuth angle is more approximate.Our method can effectively keep the azimuth information to be regularized by common offset vector volume,and has highly interpolating accuracy.The application of COV interpolation in Wushi 3D OBC seismic data shows that the new method is suitable for OBC seismic data.
国家科技重大专项(20011ZX05023-003-002)和中海油总公司科研项目(C/KJF JDCJF 006-2009)共同资助。