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Stress dependence of elastic wave dispersion and attenuation in fluid-saturated porous layered media

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Science China Earth Sciences 2023年第11期66卷 2622-2634页

作者： Fubin CHEN zhaoyun zong Xingyao YIN Alexey STOVAS National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China Laoshan Laboratory Qingdao 266580China Centre for Exploration Geophysics Curtin UniversityGPO Box U1987PerthWA 6845Australia Department of Geoscience and Petroleum Norwegian University of Science and Technology(NTNU)Trondheim 7031Norway

The fluid-saturated porous layered(FSPL)media widely exist in the Earth's subsurface and their overall mechanical properties,microscopic pore structure and wave propagation characteristics are highly relevant to the in-situ stress.However,the effect of in-situ stress on wave propagation in FSPL media cannot be well explained with the existing theories.To fill this gap,we propose the dynamic equations for FSPL media under the effect of in-situ stress based on the theories of poroacoustoelasticity and anisotropic elasticity.Biot loss mechanism is considered to account for the stress-dependent wave dispersion and attenuation induced by global wave-induced fluid flow.Thomsen's elastic anisotropy parameters are used to represent the anisotropy of the skeleton.A plane-wave analysis is implemented on dynamic equations yields the analytic solutions for fast and slow P waves and two S waves.Modelling results show that the elastic anisotropy parameters significantly determine the stress dependence of wave velocities.Vertical tortuosity and permeability have remarkable effects on fast and slow P-wave velocity curves and the corresponding attenuation peaks but have little effect on S-wave velocity.The difference in velocities of two S waves occurs when the FSPL medium is subjected to horizontal uniaxial stress,and the S wave along the stress direction has a larger velocity,which implies that the additional anisotropy other than that induced by the beddings appears due to horizontal stress.Besides,the predicted velocity results have the reasonable agreement with laboratory measurements.Our equations and results are relevant to a better understanding of wave propagation in deep strata,which provide some new theoretical insights in the rock physics,hydrocarbon exploration and stress detection in deep-strata shale reservoirs.

关键词： Fluid-saturated porous layered(FSPL)media In-situ stress Theory of poroacoustoelasticity Wave equation Wave dispersion and attenuation

Facies-constrained prestack seismic probabilistic inversion driven by rock physics

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Science China Earth Sciences 2020年第6期63卷 822-840页

作者： Kun LI Xingyao YIN zhaoyun zong School of Geosciences China University of Petroleum(East China)Qingdao 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

Seismic Rock physics plays a bridge role between the rock moduli and physical properties of the hydrocarbon reservoirs.Prestack seismic inversion is an important method for the quantitative characterization of elasticity,physical properties,lithology and fluid properties of subsurface reservoirs.In this paper,a high order approximation of rock physics model for clastic rocks is established and one seismic AVO reflection equation characterized by the high order approximation(Jacobian and Hessian matrix)of rock moduli is derived.Besides,the contribution of porosity,shale content and fluid saturation to AVO reflectivity is analyzed.The feasibility of the proposed AVO equation is discussed in the direct estimation of rock physical properties.On the basis of this,one probabilistic AVO inversion based on differential evolution-Markov chain Monte Carlo stochastic model is proposed on the premise that the model parameters obey Gaussian mixture probability prior model.The stochastic model has both the global optimization characteristics of the differential evolution algorithm and the uncertainty analysis ability of Markov chain Monte Carlo model.Through the cross parallel of multiple Markov chains,multiple stochastic solutions of the model parameters can be obtained simultaneously,and the posterior probability density distribution of the model parameters can be simulated effectively.The posterior mean is treated as the optimal solution of the model to be inverted.Besides,the variance and confidence interval are utilized to evaluate the uncertainties of the estimated results,so as to realize the simultaneous estimation of reservoir elasticity,physical properties,discrete lithofacies and dry rock skeleton.The validity of the proposed approach is verified by theoretical tests and one real application case in eastern China.

关键词： Prestack seismic inversion Seismic rock physics Physical properties estimation Bayesian inference Probabilistic mixture model Markov chain Monte Carlo

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基于固体声弹理论的地震反射透射研究进展

地球与行星物理论评（中英文） 2024年第3期55卷 344-357页

作者：陈阜斌宗兆云印兴耀深层油气全国重点实验室(中国石油大学(华东)) 青岛266580 崂山实验室青岛266580 澳大利亚科廷大学勘探地球物理中心珀斯6845

多期沉积埋深及成岩过程使地下储层介质具有复杂初始地应力,应力范围跨度大且分布方向复杂.初始地应力对储层介质岩石物理与地震波传播响应具有显著影响.地震反射透射系数方程可以量化储层性质与地球物理观测数据的关系,构建考虑初始地... 详细信息

多期沉积埋深及成岩过程使地下储层介质具有复杂初始地应力,应力范围跨度大且分布方向复杂.初始地应力对储层介质岩石物理与地震波传播响应具有显著影响.地震反射透射系数方程可以量化储层性质与地球物理观测数据的关系,构建考虑初始地应力作用的地震反射透射系数方程有利于更好理解深部储层界面处地震波传播特征,为深层油气勘探奠定理论基础,正逐渐受到国内外学者的关注.当前已提出的相关理论模型主要从固体声弹理论出发,考虑初始应力与地震波扰动引起的微小固体应变,聚焦岩石物理与地震反射透射参数化的理论方法研究,在应力诱导各向异性参数反演、地应力预测、油气储层识别等方面开展了初步实际应用探索.本文首先介绍固体声弹理论核心内容,然后介绍了基于声弹理论的地震反射透射模型、基本假设及其阶段性应用进展,讨论了方程的局限性以及在地震勘探领域的发展方向.

关键词：地震反射透射系数固体声弹理论初始地应力深部储层

Improving seismic interpretation: a high-contrast approximation to the reflection coefficient of a plane longitudinal wave

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Petroleum Science 2013年第4期10卷 466-476页

作者： Yin Xingyao zong zhaoyun Wu Guochen China University of Petroleum

Linearized approximations of reflection and transmission coefficients set a foundation for amplitude versus offset（AVO） analysis and inversion in exploration geophysics.However,the weak properties contrast hypothesis of those linearized approximate equations leads to big errors when the two media across the interface vary dramatically.To extend the application of AVO analysis and inversion to high contrast between the properties of the two layers,we derive a novel nonlinearized high-contrast approximation of the PP-wave reflection coefficient,which establishes the direct relationship between PPwave reflection coefficient and P-wave velocities,S-wave velocities and densities across the interface.（A PP wave is a reflected compressional wave from an incident compressional wave（P-wave）.） This novel approximation is derived from the exact reflection coefficient equation with Taylor expansion for the incident angle.Model tests demonstrate that,compared with the reflection coefficients of the linearized approximations,the reflection coefficients of the novel nonlinearized approximate equation agree with those of the exact PP equation better for a high contrast interface with a moderate incident angle.Furthermore,we introduce a nonlinear direct inversion method utilizing the novel reflection coefficient equation as forward solver,to implement the direct inversion for the six parameters including P-wave velocities,S-wave velocities,and densities in the upper and lower layers across the interface.This nonlinear inversion algorithm is able to estimate the inverse of the nonlinear function in terms of model parameters directly rather than in a conventional optimization way.Three examples verified the feasibility and suitability of this novel approximation for a high contrast interface,and we still could estimate the six parameters across the interface reasonably when the parameters in both media across the interface vary about 50%.

关键词： High-contrast interface,reflection coefficient,amplitude variation with angle,multiparameter estimation,artificial neural network inversion

Seismic wave scattering inversion for fluid factor of heterogeneous media

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Science China Earth Sciences 2014年第12期57卷 542-549页

作者： YIN XingYao zong zhaoyun WU GuoChen School of Geosciences China University of Petroleum (Huadong)

Elastic wave inverse scattering theory plays an important role in parameters estimation of heterogeneous media.Combining inverse scattering theory,perturbation theory and stationary phase approximation,we derive the P-wave seismic scattering coefficient equation in terms of fluid factor,shear modulus and density of background homogeneous media and perturbation media.With this equation as forward solver,a pre-stack seismic Bayesian inversion method is proposed to estimate the fluid factor of heterogeneous media.In this method,Cauchy distribution is utilized to the ratios of fluid factors,shear moduli and densities of perturbation media and background homogeneous media,respectively.Gaussian distribution is utilized to the likelihood function.The introduction of constraints from initial smooth models enhances the stability of the estimation of model parameters.Model test and real data example demonstrate that the proposed method is able to estimate the fluid factor of heterogeneous media from pre-stack seismic data directly and reasonably.

关键词：非均匀介质地震波散射地震反演流体因子模型参数估计散射理论剪切模量

Nicotinamide reverses liver fibrosis in a thioacetamide induced mouse model

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Nicotinamide reverses liver fibrosis in a thioacetamide indu...

Non-linear inversion of fundamental-mode surface waves

2018年中国质谱学术大会（CMSC2018）

作者： zhaoyun zong Jing Liu Jie Jin Haiteng Deng MOE Key Laboratory of Bioinformatics School of Life SciencesTsinghua University

Liver fibrosis is a common liver disease mainly due to chronic viral hepatitis, high fat diet and alcoholism. Previous studies have shown that reactive oxygen species(ROS) are produced during this process. Nicotinamide adenine dinucleotide(NAD+) as a vital hydrogen carrier for redox enzymes plays important roles in redox reactions of cells. As a major NAD+ precursor, nicotinamide(NAM) can synthesize NAD+ by salvage pathway. This study investigates the therapy roles of NAM in liver fibrosis by using a thioactamide induced mouse model. The results show that NAM reverses liver fibrosis in a mouse model induced by thioacetamide. Furthermore, metabolomics and proteomics analysis reveals that NAM suppresses the activation of hepatic stellate cells via maintaining vitamin A content and inhibiting the expression of SMAD2 in hepatic stellate cells. In conclusion, these findings provide new insights into a potential treatment against liver fibrosis.

关键词： NAD+ nicotinamide liver fibrosis

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Non-linear inversion of fundamental-mode surface waves

2019年中国地球科学联合学术年会

作者： Hongli Zhao Concettina Nunziata Chengyu Sun zhaoyun zong China University of Petroleum (East China) University of Napoli Federico Ⅱ

1. Introduction Surface waves are composed of finite numbers of modes, including the fundamental mode and the higher modes(also named overtones). The fundamental mode, however, dominates the shallow part of the Earth. In order to obtain the properties of the subsurface, I focus on the fundamental mode of the surface wave and utilize the Frequency-time analysis

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含流体复杂孔隙介质地震波衰减与频散

地球物理学报 2022年第10期65卷 4012-4027页

作者：宗兆云宋琉璇印兴耀中国石油大学(华东) 青岛266580

含流体孔隙介质中地震波的速度频散和衰减在指导复杂储层含油气性识别领域具有重要意义.本文构建了包含微观挤喷流与介观层间流影响的跨尺度模型,并使用求解介质等效模量的方式得到了模型中地震波的频散速度与衰减因子,克服了前人在高... 详细信息

含流体孔隙介质中地震波的速度频散和衰减在指导复杂储层含油气性识别领域具有重要意义.本文构建了包含微观挤喷流与介观层间流影响的跨尺度模型,并使用求解介质等效模量的方式得到了模型中地震波的频散速度与衰减因子,克服了前人在高频段计算结果出现异常值以及不同尺度衰减峰无法分离的缺陷.在该双尺度模型的基础上,本文又综合考虑宏观尺度Biot流,将三种地震波衰减理论耦合,建立了相对统一的三尺度地震波衰减岩石物理模型.在Biot理论框架下,分析了非均匀性流体、孔裂隙结构、微观挤喷流以及介观层间流对流体压力与弹性模量的影响,得到了该三尺度模型中地震波的波动方程,并求解得到了相应的地震波衰减与频散曲线,分析了不同介质参数对衰减与频散曲线的影响.我们推导了在该模型上覆均匀各向同性介质情况下,分界面处各类极性波的反射、透射系数特征方程,并得到了随频率以及入射角变化的反射、透射系数三维曲面.

关键词：含流体孔隙介质地震波衰减速度频散反射透射系数

地震岩石物理驱动的裂缝预测技术研究现状与进展(Ⅰ)——裂缝储层岩石物理理论

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石油物探 2022年第2期61卷 183-204页

作者：印兴耀马正乾向伟宗兆云中国石油大学(华东)地球科学与技术学院山东青岛266580 海洋国家实验室海洋矿产资源评价与探测技术功能实验室山东青岛266071

从裂缝储层等效各向异性岩石物理理论和五维地震数据裂缝预测技术两个方面对岩石物理驱动的裂缝预测方法研究现状与进展进行了评述。第一部分(Ⅰ)主要介绍裂缝储层等效各向异性岩石物理理论的研究现状。首先从地震波诱导孔缝流体的3种... 详细信息

从裂缝储层等效各向异性岩石物理理论和五维地震数据裂缝预测技术两个方面对岩石物理驱动的裂缝预测方法研究现状与进展进行了评述。第一部分(Ⅰ)主要介绍裂缝储层等效各向异性岩石物理理论的研究现状。首先从地震波诱导孔缝流体的3种不同状态出发,总结了6种典型的等效各向异性岩石物理理论及其扩展,然后基于Hudson理论、Thomsen模型和Gurevich模型分析了宏观地震反射对微观因素的响应特征,发现裂缝密度、流体类型及孔缝连通性对地震方位反射特征影响较大,总结认为:对于发育垂直裂缝的含气页岩或含油水砂岩,可将背景孔隙度先验值(甚至常数值)直接代入反演流程;对于孔喉发育良好的含气储层,可直接设置裂缝横纵比为常数进行反演。未来研究面临着目标储层复杂程度更大、地震描述精度要求更高等挑战,应从强各向异性岩石物理建模、裂缝实际形态数学表征、多尺度多频带复杂裂缝介质定量描述等方面开展研究。五维地震数据裂缝预测技术研究现状与进展将在第二部分(Ⅱ)阐述。

关键词：裂缝预测五维地震数据地震岩石物理各向异性频散与衰减地震反射特征