摘要
采用同时考虑Biot流动和喷射流动机制的横向各向同性BISQ模型模拟横向各向同性孔隙地层,理论求解该地层中多极源激发的裸眼井孔导波声场,通过数值求解井孔复频散方程的复根获得最低阶导波的相速度和衰减系数,并考察了特征喷射流对充流体井孔中Stoneley波和弯曲波传播的影响.结果表明:考虑喷射流机制后,喷射流变化不影响Stoneley波和弯曲波的频散,但衰减均显著增大;其衰减随水平和垂直特征喷射流长度变化的趋势相反,其中弯曲波的衰减特性在低频段和高频段的变化规律还发生反转.
The.authors presented theoretical solution and numerical analysis of the acoustic field of Stoneney and flexural waves in a fluid-filled borehole surrounded by the transversely isotropic two-phase formation with the Biot-squirt mechanisms.The effects of the characteristic squirt-flow length on the dispersion and attenuation of fundamental guided waves were emphatically studied.The results show that the velocity dispersions are almost independent of characteristic quirt-flow length; attenuation coefficients of Stoneley wave and flexural wave based on BISQ model are obviously bigger than that based on Biot model only.The attenuation coefficient of stoneley wave tends to increase with the increase of horizontal characteristic squirt-flow length R_1,and decrease with the increase of vertical characteristic squirt-flow length R_3.The attenuation coefficient of flexural wave tends to increase with the increase of R_1 below a certain frequency and to decrease with the increase of R_1 above a certain frequency,while the variation tendency of attenuation coefficient due to R_3 is just opposite to above variation trend.
出处
《吉林大学学报（理学版）》
CAS
CSCD
北大核心
2013年第3期491-496,共6页
Journal of Jilin University:Science Edition
基金
国家自然科学基金重点项目基金(批准号:11134011)
声场声信息国家重点实验室开放课题研究项目基金(批准号SKLOA201108)
吉林大学科学前沿与交叉学科创新项目
