特征层位约束速度建模在HS地区的应用  

Application of characteristic layers constrained tomography velocity modeling in HS area

作　　者：玄长虹[1,2] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]中国石化胜利石油管理局物探研究院,东营257100

出　　处：《地球物理学进展》2013年第6期3197-3201,共5页Progress in Geophysics

基　　金：国家863课题"陆上非一致性时延地震;微地震油藏监测方法研究"(2011AA060303)

摘　　要：HS地区位于准噶尔盆地北缘山前带戈壁砾石区,地表起伏较大,地下构造复杂,速度建模困难.层析速度建模是叠前深度偏移常用的建模方法之一,但是对于构造特别复杂,地震资料信噪比低的山前带地区,仅仅依靠层析反演是不能解决精确建模的问题的.通过构建特征层位的方法,将具有相同或相近波场特性的地层划分成组,通过特征层位约束可以大大提高层析反演的效率,有效改善速度建模的精度.实际资料的处理结果也体现了这种方法的可行性和有效性.Piedmonts are widely distributed in the edge of Junggar basin.HS area is in the north edge piedmont.However,with the big surface elevation differences and complicated sub-surface structure, it is difficult to set up the velocity model.Tomography velocity modeling is a conventional method to be used in pre-depth migration processing.But for these piedmonts with complicated geological structure and low S/N ratio seismic data,tomography is not enough for precise velocity modeling.Using the characteristic layers,it is easy to divide stratums with the same or similar wave field characteristics into formations.By constrainting with characteristic layers,the efficiency and the precision of tomographic inversion can be improved enormously.The actual data application indicates the flexible and effectiveness of the method.

关 键 词：山前带 层析速度建模 叠前深度偏移 特征层位 

分 类 号：P631[天文地球—地质矿产勘探]