摘要
地震曲率分析法能根据致密脆性岩石的地震反射同相轴的弯曲程度(曲率),预测裂缝发育程度。曲率在数学上可以通过倾角与倾角的导数表示,由此利用地震数据体的二次倾角计算就可以获得地震曲率体。目前基于倾角的地震曲率体计算方法适应于连续反射面的曲率计算,但在错断与中断等不连续部位,由于在时窗内不能扫描到精确的倾角而导致曲率计算的模糊,从而降低断层两盘地段曲率的准确预测。本文提出基于直平面与曲界面相结合的二次倾角扫描方法,结合保持边缘的多窗口扫描技术,实现连续反射、错断反射两类同相轴弯曲程度的准确检测,进而实现高精度地震曲率体的计算。实际资料的检测结果表明,文中所提方法提取的曲率异常能更加准确地反映微起伏构造,精细检测与刻画断裂带细节。
Seismic curvature attribute analysis is a new method for fracture prediction based on the bend degree of seismic reflected events on the interface of compact and brittleness stratum.Curvature can be expressed in term of mathematics as dip and the derivation of dip,so seismic curvature cube can be obtained by two time derivations on original seismic cube.We put forward a new twice scan method respectively on plane and curve plane combining with multi-windows scan technology which possess the edge preservation characteristic,to obtain higher precision curvature cube.This method can extract the bend degree of seismic reflected events both continuity with little strain and discontinuity with faults.Example results of real data prove that our method shows better low relief structures from seismic reflections,and highlights details of fault edges and fractures.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2012年第6期965-972,1024+842,共8页
Oil Geophysical Prospecting
基金
国家重点基础研究计划(973)项目(2011CB201002)
国家重大专项课题(2011ZX05014-001)
中国石化科技部项目(P11034)共同资助
关键词
地震曲率体
倾角属性
扫描技术
边缘保持
裂缝检测
seismic curvature cube,dip attribution,scan technology,edge preservation,fracture prediction
