摘要
考虑到裂缝介质的双重孔隙特征,将Thomsen等效孔隙裂缝模型与线性滑动模型进行等价对比,得出Thomsen裂缝模型的广义各向异性参数并将其引入到HTI介质的纵波、转换横波弹性阻抗公式中,最终得到对应Thomsen裂缝介质的弹性阻抗公式,建立裂缝参数、岩性参数以及物性参数与弹性阻抗的直接函数关系,对弹性阻抗归一化后进行数值模拟。模拟结果表明,裂缝型油气藏弹性阻抗对裂缝填充物性质极其敏感,且在不同流体饱和条件下对基岩的横纵波速度平方比、基质孔隙度的响应程度差异显著。在此基础上,将各向同性介质流体因子定义延伸,建立适用于各向异性介质的广义流体因子。数值模拟和实际数据处理结果表明,优选的因子能够更好地识别等效孔隙裂缝介质中的流体。
Considering double porosity features of fracture media, generalized anisotropic parameters obtained in the Thomsen e-quivalent porous media model,equivalent to linear slip model are introduce into P-wave and P-SV-wave elastic impedance equations in HTI media,and the elastic impedance formula corresponded to Thomsen fracture media is obtained.The direct function relation between fracture,lithology, physical property parameters and elastic impedance is established.Numerical simulation show that the elastic impedance of fractured reservoirs is very sensitive to the properties of fracture fillings,its response degree to (vs/vp)2 and equant matrix porosity is significantly different.Based on this,a generalized fluid factor suitable for the anisotropic media is estab-lished by extending the isotropic media fluid factor. The test results of numerical simulation and actual data processing results indi-cate that the generalized fluid factor can accurately identify the fluid in equivalent porous fracture media
出处
《石油物探》
EI
CSCD
北大核心
2017年第2期192-202,共11页
Geophysical Prospecting For Petroleum
基金
中国地震局兰州地震研究所地震科技发展基金项目(2016050)
中国石油天然气股份有限公司科学研究与技术开发项目(2015B-3712)共同资助~~
关键词
裂缝介质
弹性阻抗
流体识别因子
各向异性参数
柔量
fracture media,elastic impedance,fluid identification factor,anisotropic parameter,weaknesses