石油物探2018，Vol.57Issue(2)：302-311,10.DOI:10.3969/j.issn.1000-1441.2018.02.016
基于广义弹性阻抗的流体识别因子反演方法研究与应用
Fluid identification factor inversion based on generalized elastic impedance
摘要
Abstract
It is difficult to predict tight sandstone reservoirs using conventional elastic impedance (EI) inversion for fluid identification.Therefore,a generalized elastic impedance (GEI) approximation equation was derived as a formula of two parameters,namely a parameter of the P-and S-wave velocity ratio and a parameter of a new fluid factor (i.e.,the ratio of the Gassmann fluid term to S-wave velocity).The two parameters can be directly calculated by inversion,avoiding cumulative errors inherent to indirect calculations.The P-and S-wave velocity ratio parameter can be used to obtain Poisson's ratio.A forward modeling test revealed that the GEI formula had a higher precision than the EI formula for tight sandstone reservoir prediction.From a comparative analysis of multiple parameters from logging data in the research area,Poisson's ratio is the most sensitive parameter for lithological identification,and the new fluid factor is the most sensitive parameter for fluid identification.Field seismic data inversion in the Sulige gas field in the Ordos Basin,China,verified the reliability of the new fluid factor for fluid identification at a tight sandstone reservoir,and indicated that the new fluid factor exhibited a degree of anti-noise properties.关键词
广义弹性阻抗反演/致密砂岩/岩性识别/流体因子/弹性阻抗/流体项/泊松比Key words
GEI inversion/tight sandstone/lithological identification/fluid factor/elastic impedance/fluid item/Poisson's ratio分类
天文与地球科学引用本文复制引用
贾凌云,李琳,王千遥,马劲风,王浩璠,王大兴..基于广义弹性阻抗的流体识别因子反演方法研究与应用[J].石油物探,2018,57(2):302-311,10.基金项目
国家高技术研究发展计划(863计划)(2012AA050103)资助.This research is financially supported by the National High-tech R & D Program of China (863 Program) (Grant No.2012AA050103). （863计划）
