首页|流体饱和周期性层状孔隙介质模型平行层面传播的纵波频散和衰减研究

流体饱和周期性层状孔隙介质模型平行层面传播的纵波频散和衰减研究

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孔隙介质中的地震波传播一直是油气地震勘探领域的研究热点和难点问题.该科学难题源 自不同尺度的裂隙、孔隙、溶洞与岩石骨架之间的耦合作用,导致地震波场特征复杂.目前相关的研究主要集中于探索孔隙介质中地震波的传播机制及地震响应的特征与变化规律,包括对地震波在复杂孔隙介质中传播,进行比较精确的数学物理描述以及数值实现.地球物理学家们集中于研究垂直于地层层面方向入射的地震波频散和衰减,而忽略了实际地球介质中的地震波是以任意角度(方向)入射并进行传播的普遍性情况.在前人的研究基础上,本文的创新之处在于将纵波的入射方向扩展到平行于流体饱和的周期性层状孔隙介质模型层面方向.针对流体饱和的周期性层状孔隙介质模型,提出 了 介观波致流(Wave-induced Fluid Flow,WIFF)对流体饱和孔隙层状介质中平行于层面方向入射的纵波频散、衰减及频变各向异性的新模型.利用准静态Biot孔弹性方程推导出了模型的孔隙压力、流体流动速度、平均应力和平均应变等物理量的解析表达式,进而得到流体饱和的周期性层状孔隙介质复纵波模量的精确解析解.然后,利用复纵波模量讨论了纵波速度频散、衰减和频变各向异性特征,讨论了背景介质孔隙度和渗透率对纵波速度频散和逆品质因子的影响,理论研究及数值试验厘清了纵波在该类型介质中平行于层面方向入射传播时的地震响应特征及传播规律.
Research on P-wave dispersion and attenuation of propagating in the direction of paralleling to a periodically layered fluid saturated porous medium model
Seismic wave propagation in porous media has always been a research hotspot and difficult problem in the field of oil and gas seismic exploration.This scientific problem stems from the coupling between fractures,pores,caves and rock skeletons at different scales,resulting in complex seismic wave field characteristics.At present,the relevant research mainly focuses on exploring the propagation mechanism of seismic waves in porous media and the characteristics and changes of seismic response,including the more accurate mathematical physical description and numerical realization of seismic wave propagation in complex porous media.Most geophysicists have focused on the seismic wave dispersion and attenuation of seismic waves incident perpendicular to the stratigraphic level,ignoring the prevalence of seismic waves in the real Earth medium being incident at any angle(direction)and propagating.On the basis of the previous research,the innovation of this paper is to extend the incidence direction of P-wave to parallel to the plane direction of the periodically layered porous medium model with the fluid saturation.Aiming at the periodically layered porous medium model of fluid saturation,a new model of Mesoscopic Wave-Induced Fluid Flow(WIFF)on P-wave dispersion,attenuation and frequency-dependent anisotropy incident parallel to the plane direction in fluid saturated porous layered media is proposed.The quasi-static Biot porous elastic equation is used to derive the analytical expressions of the physical quantities such as pore pressure,fluid flow velocity,average stress and average strain of the model,and then the accurate analytical solution of the complex P-wave modulus of the periodically layered porous medium saturated by fluid saturation is obtained.Then,the characteristics of P-wave velocity dispersion,attenuation and frequency-dependent anisotropy are discussed by using complex P-wave modulus,and the effects of background porosity and permeability on P-wave velocity dispersion and inverse quality factors are discussed,and theoretical research and numerical experiments clarify the seismic response characteristics and propagation rules of P-wave when it propagate parallel to the plane direction in this type of medium.

Mesoscopic Wave-Induced Fluid Flow(WIFF)Periodically layered porous medium model with fluid saturationP-wave dispersion and attenuationP-wave frequency-dependent anisotropy

马媛、廖建平、文萍、刘和秀、周林、张学娟

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湖南科技大学地球科学与空间信息工程学院,湘潭 411201

中国石化地球物理重点实验室,中石化石油物探技术研究院有限公司,南京 211103

重庆科技大学非常规油气开发研究院,重庆 401331

介观波致流 流体饱和的周期性层状孔隙介质模型 纵波频散和衰减 纵波频变各向异性

国家自然科学基金项目国家自然科学基金项目湖南省自然科学基金中石化地球物理重点实验室开放基金中石化地球物理重点实验室开放基金湖南省普通高等学校教学改革研究项目重庆科技大学科研项目重庆科技大学科研项目

42074167418741562023JJ3023433550006-22-FW0399-002733550006-20-ZC0699-0012-ZR01HNJG-2021-0652ckrc20231101ckrc20231102

2024

10.6038/pg2024HH0141

地球物理学进展
中国科学院地质与地球物理研究所 中国地球物理学会

地球物理学进展

CSTPCD北大核心
影响因子：1.761
ISSN：1004-2903
年,卷(期)：2024.39(1)
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