摘要
利用交叉偶极声波数据可以提取出快慢弯曲波曲线,在此基础上利用加权频谱相干法可以稳定的提取出快慢弯曲波频散曲线.利用快慢弯曲波频散曲线的形态能够区分各向异性的类型.若产生交叉现象,则证明应力作用明显.若两者重合,则证明该点地层属于各向同性地层.当地层中存在页岩、裂缝等地层固有的各向异性特征时,快慢弯曲波曲线在整个频段分开,并在低频处逼近地层真实慢度.
Fast and slow flexural-wave curves can dispersion curves can be drawn based on weighted be abstracted from crossed dipole acoustic data. Flexural-wave spectral semblance method. Flexural-wave dispersion curves can classify formation anisotropy. The phenomenon of two flexural-wave dispersion curves cross is a result of near- wellbore stress concentration. The coincidence of two flexural-wave dispersion curves indicates an isotropic formation. In cases of intrinsic anisotropy, such as shales or fractured formations, the fast and slow shear-wave dispersion curves are separate everywhere and tend to the true slowness at low frequency.
出处
《地球物理学进展》
CSCD
北大核心
2013年第3期1425-1431,共7页
Progress in Geophysics
基金
国家重大专项"复杂储层油气测井解释理论方法与处理技术"(2011ZX05020-008)
关键词
各向异性
频谱加权相干法
频散曲线
裂缝
anisotropy, weighted spectral semblance method, dispersive curves, fracture
