摘要
在岩石孔隙度和围限压力相同条件下,气饱和岩石的纵横波速度比小于水饱和岩石的纵横波速度比。本文以此为基础,提出一种直观指示气层的解释方法。用纵横波速度比测量值对比纵横波速度比背景值,当前者小于后者时,直观指示是气层,并用中子和密度孔隙度以及冲洗带和原状地层含水孔隙度作验证。应用效果表明,提高了直观指示气层的能力和准确性。文中给出了几个应用实例。
The velocity ratio of compressional and shear waves in gas saturated rocks is less than that in water saturated ones when their porosities and confining pressures are the same. this paper have proposed an interpre-tation technique for visually identifying gas formation in which measured velocity ratio of compressional and shear waves is shown by a contrast with its background value. A formation is indicated as gas producing when the measured velocity ratio is less than the background one. This method has been tested and verified with neutron and density porosities as well as flushed zone and initial water containing formation porosities. It enhances the ability and accuracy of visual indication gas formation. Field examples are demonstrated.
出处
《石油学报》
EI
CAS
CSCD
北大核心
1990年第3期41-49,共9页
Acta Petrolei Sinica
