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Bayesian seismic inversion for estimating fluid content and fracture parameters in a gas-saturated fractured porous reservoir

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Science China Earth Sciences 2019年第5期62卷 798-811页

作者： Xinpeng PAN guangzhi zhang School of Sciences China University of Petroleum (East China) Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology

Understanding the effects of in situ fluid content and fracture parameters on seismic characteristics is important for the subsurface exploration and production of fractured porous rocks. The ratio of normal-to-shear fracture compliance is typically utilized as a fluid indicator to evaluate anisotropy and identify fluids filling the fractures, but it represents an underdetermined problem because this fluid indicator varies as a function of both fracture geometry and fluid content. On the bases of anisotropic Gassmann's equation and linear-slip model, we suggest an anisotropic poroelasticity model for fractured porous reservoirs. By combining a perturbed stiffness matrix and asymptotic ray theory, we then construct a direct relationship between the PP-wave reflection coefficients and characteristic parameters of fluids(P-and S-wave moduli) and fractures(fracture quasi-weaknesses), thereby decoupling the effects of fluid and fracture properties on seismic reflection *** incorporating fracture quasi-weakness parameters, we propose a novel parameterization method for elastic impedance variation with offset and azimuth(EIVOA). By incorporating wide-azimuth observable seismic reflection data with regularization constraints, we utilize Bayesian seismic inversion to estimate the fluid content and fracture parameters of fractured porous rocks. Tests on synthetic and real data demonstrate that fluid and fracture properties can be reasonably estimated directly from azimuthal seismic data and the proposed approach provides a reliable method for fluid identification and fracture characterization in a gas-saturated fractured porous reservoir.

关键词： Fluid parameters Fracture parameters Fractured porous reservoir Poroelasticity theory Bayesian seismic inversion

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Azimuthally pre-stack seismic inversion for orthorhombic anisotropy driven by rock physics

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Science China Earth Sciences 2018年第4期61卷 425-440页

作者： Xinpeng PAN guangzhi zhang Xingyao YIN 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

Based on the long-wavelength approximation,a set of parallel vertical fractures embedded in periodic thin interbeds can be regarded as an equivalent orthorhombic medium. Rock physics is the basis for constructing the relationship between fracture parameters and seismic response. Seismic scattering is an effective way to inverse anisotropic parameters. In this study,we propose a reliable method for predicting the Thomsen's weak anisotropic parameters and fracture weaknesses in an orthorhombic fractured reservoir using azimuthal pre-stack seismic data. First, considering the influence of fluid substitution in mineral matrix, porosity, fractures and anisotropic rocks, we estimate the orthorhombic anisotropic stiffness coefficients by constructing an equivalent rock physics model for fractured rocks. Further, we predict the logging elastic parameters, Thomsen's weak parameters, and fracture weaknesses to provide the initial model constraints for the seismic inversion. Then, we derive the P-wave reflection coefficient equation for the inversion of Thomsen's weak anisotropic parameters and fracture ***-sparse and smoothing-model constraint regularization taken into account in a Bayesian framework, we finally develop a method of amplitude variation with angles of incidence and azimuth(AVAZ) inversion for Thomsen's weak anisotropic parameters and fracture weaknesses, and the model parameters are estimated by using the nonlinear iteratively reweighted least squares(IRLS) strategy. Both synthetic and real examples show that the method can directly estimate the orthorhombic characteristic parameters from the azimuthally pre-stack seismic data, which provides a reliable seismic inversion method for predicting Thomsen's weak anisotropic parameters and fracture weaknesses.

关键词： Orthorhombic anisotropy Fractures Rock physics AVAZ inversion

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Sorption of Triton X-100 on soil organic matter fractions:Kinetics and isotherms

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Journal of Environmental Sciences 2009年第6期21卷 795-800页

作者： zhang guangzhi HU Hao SUN Weiling NI Jinren Department of Environmental Engineering Peking University The Key Laboratory of Water and Sediment Sciences Ministry of Education Beijing 100871 China Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 China

Kinetics and isotherms of Triton X-100 sorption on soil,base-extracted soil（BE）,humic acid（HA） and humin（HM） were investigated respectively to get better understanding on characteristics of the surfactant sorption onto different soil organic matters（SOMs）.It was demonstrated that the kinetics results could be satisfactorily described by the pseudo-second order *** half of the time to reach equilibrium（t1/2） for different sorbents followed the sequence of soil 〉 HA 〉 BE 〉 ***,the calculated equilibrium sorption capacity（Ceq） was found in the sequence of HA 〉 BE 〉 HM 〉 soil,which agreed well with the experimental *** isotherms of Triton X-100 sorption on soil and HA could be well described by the S-type isotherm,but BE and HM by the *** isotherms of all the four sorbents were found reasonably fitted to the Langmuir *** Kd value,defined as the ratio of Triton X-100 in sorbent and in the equilibrium solution for given concentrations,generally followed the order of HM 〉 HA 〉 soil 〉 *** HM and HA showed high affnity for Triton X-100,but the HA and HM in soil and BE were tightly bounded by the ***,the HA on the soil surface might dominate the sorption,whereas the bounded HM would play a key role upon the surfactants being penetrated inside the soil.

关键词： Triton X-100 sorption soil organic matters nonionic surfactant kinetics isotherms

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Bayesian Markov chain Monte Carlo inversion for anisotropy of PP-and PS-wave in weakly anisotropic and heterogeneous media

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Earthquake Science 2017年第1期30卷 33-46页

作者： Xinpeng Pan guangzhi zhang Xingyao Yin School of Sciences China University of Petroleum (Huadong) Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology

A single set of vertically aligned cracks embedded in a purely isotropic background may be con- sidered as a long-wavelength effective transversely iso- tropy （HTI） medium with a horizontal symmetry axis. The crack-induced HTI anisotropy can be characterized by the weakly anisotropic parameters introduced by Thomsen. The seismic scattering theory can be utilized for the inversion for the anisotropic parameters in weakly aniso- tropic and heterogeneous HTI media. Based on the seismic scattering theory, we first derived the linearized PP- and PS-wave reflection coefficients in terms of P- and S-wave impedances, density as well as three anisotropic parameters in HTI media. Then, we proposed a novel Bayesian Mar- kov chain Monte Carlo inversion method of PP- and PS- wave for six elastic and anisotropic parameters directly. Tests on synthetic azimuthal seismic data contaminated by random errors demonstrated that this method appears more accurate, anti-noise and stable owing to the usage of the constrained PS-wave compared with the standards inver- sion scheme taking only the PP-wave into account.

关键词： Crack-induced anisotropy Seismic scattering theory HTI media PP- and PS-wave - Bayesian Markov chain Monte Carlo inversion

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An experimental and theoretical study on photoluminescence of Ce^(3+)-doped ZnS quantum dots and their application in Aspergillus oryzae

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Journal of Rare Earths 2024年第6期42卷 1020-1028,I0001页

作者： Yan Lei guangzhi zhang Yitong Yao Gaiqin Zhu Zhong Chen Jiangrong Dan Hua Liu Shuwang Duo School of Materials and Mechanical and Electrical EngineeringJiangxi Science and Technology Normal University Nanchang330013China

ZnS and ZnS:3.125%Ce^(3+)(ZSC)quantum dots(QDs)were synthesized by a low-temperature solid-phase *** crystal structure,photoluminescence(PL)properties of ZSC QDs,and their effects on the growth and kojic acid production of Aspergillus oryzae(***)were *** is found that both QDs have a cubic blend structure with the average particle size ranging of 2.75-6.14 ***^(3+)doping not only increases the band gap of ZnS QDs from 3.43 to 3.48 eV,but also increases the PL intensity by about 2.23 times,which is due to the fact that the electron carrier concentration is improved,and then the rate of radiative recombination is *** integral emission intensity,biomass,extracellular proteins yield,and kojic acid production of *** cultured with ZSC(ZnS)QDs are about 4.31(3.23),1.61(1.20),1.12(1.09),and 2.99(1.68)times higher than that of medium without QDs,respectively.

关键词： Zns Quantum dots Doping First-principles calculations Aspergllus oryzae Rare earths

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Seismic inversion for underground fractures detection based on effective anisotropy and fluid substitution

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Science China Earth Sciences 2015年第5期58卷 805-814页

作者： CHEN HuaiZhen YIN XingYao GAO JianHu LIU BingYang zhang guangzhi School of Geosciences China University of Petroleum Northwest Branch of Research Institute of Petroleum Exploration and Development

Underground fractures play an important role in the storage and movement of hydrocarbon fluid. Fracture rock physics has been the useful bridge between fracture parameters and seismic response. In this paper, we aim to use seismic data to predict subsurface fractures based on rock physics. We begin with the construction of fracture rock physics model. Using the model, we may estimate P-wave velocity, S-wave velocity and fracture rock physics parameters. Then we derive a new approximate formula for the analysis of the relationship between fracture rock physics parameters and seismic response, and we also propose the method which uses seismic data to invert the elastic and rock physics parameters of fractured rock. We end with the method verification, which includes using well-logging data to confirm the reliability of fracture rock physics effective model and utilizing real seismic data to validate the applicability of the inversion method. Tests show that the fracture rock physics effective model may be used to estimate velocities and fracture rock physics parameters reliably, and the inversion method is resultful even when the seismic data is added with random noise. Real data test also indicates the inversion method can be applied into the estimation of the elastic and fracture weaknesses parameters in the target area.

关键词： rock physics fractures seismic inversion anisotropy

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Predictors of re-hospitalization over a two-year follow-up period among patients with schizophrenia enrolled in a community management program in Chengdu, China

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上海精神医学 2012年第1X期24卷 30-37页

作者： Yinbo zhang guangzhi DAI Chengdu Mental Health Center Fourth People＇s Hospital Chengdu 610035 China

BACKGROUND:China has recently introduced a community-based service network for managing individuals with schizophrenia but there has been relatively little formal evaluation of the effectiveness of this approach.;OBJECTIVE:Assess the retention rate and the two-year re-hospitalization rate of patients who are enrolled in the community management network in Chengdu, China.;METHODS:Patients with a confirmed diagnosis of schizophrenia who had at least one prior hospitalization and who were enrolled in the service network at the community health clinics in 14 communities in the Jinniu District of Chengdu and 10 communities in the Qingyang District of Chengdu participated in the two-year prospective follow-up assessment. Detailed demographic and clinical information was obtained at the time of intake into the follow-up program and their hospitalization status was recorded during monthly evaluations over the subsequent two years.;RESULTS:Of the 1 027 participating patients, 963 (93.8%) remained in the program for the entire two-year period. Patients with a lower level of education and those who did not live with family members were more likely to drop-out of the network. Among the 963 patients who completed the follow-up 174 (18.1%) were re-hospitalized over the two-year period. Multivariate logistic regression identified factors related to re-hospitalization: not married or not living with family members, having more prominent positive and negative symptoms at the time of intake, and using medication less in the six months prior to intake.;CONCLUSIONS:The 94% two-year retention of patients in this urban community management network for individuals with schizophrenia was excellent and the two-year re-hospitalization rate of 18% is better than that reported in most similar programs in other countries. Patients not living with family members were at higher risk for dropping out of the network and for re-hospitalization so this is a high-risk group that deserves special atten

关键词：精神分裂症社区患者成都随访中国管理程序 Logistic回归

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Modern agriculture and One Health

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贫困所致传染病(英文) 2024年第5期13卷 1-5页

作者： zhang guangzhi Qiu Yu Boireau Pascal zhang Yinghui Ma Xin Jiang Hui Xin Ting zhang Maodun Tadesse Zelalem Wani Nisar Ahmad Song Junxia Ding Jiabo Institute of Animal Sciences Chinese Academy of Agricultural Sciences Beijing China Animal Production and Health Division Food and Agriculture Organization of the United Nations Rome Italy ANSES Laboratoire de Santé Animale Maisons-Alfort France Institute of Veterinary Drug Control Beijing China University of California Berkeley CA-3200 USA Reproductive Biotechnology Center Dubai UAE

Background The development of modern agriculture has significantly contributed to improving global food security and safety, alleviating poverty, and enhancing human health and livelihoods. However, the rapid advancement of modern agriculture has also brought about various challenges that limit its sustainable development. This commentary aims to discuss these issues through the One Health lens, and provide valuable insights for balancing modern agricultural activities with the need to protect and promote the health of all the *** text This commentary explores the multifaceted impacts of modern agriculture on social development, as well as the associated various health challenges and environmental impacts within the One Health framework. Key issues include ecosystem degradation, increased risk of interspecies disease transmission like zoonoses, reverse zoonoses, and vector-borne diseases, and the escalated threat of antimicrobial resistance due to intensified agricultural production and increased antimicrobial use. To address these challenges, this commentary outlines potential solutions anchored in the development and implementation of modern technologies and good agricultural practices, such as precision farming, integrated pest management, biosecurity measures, vaccination programs, as well as surveillance and early detection of health *** Good agricultural practices supported by scientific and technological advancements are essential for aligning productivity with the One Health vision, ensuring the health and resilience of all the sectors. Enhancing stakeholder education, strengthening regulatory frameworks, and providing supportive policies and infrastructure for farmers to adopt sustainable practices are crucial for the long-term viability of agrifood systems. The Food and Agriculture Organization of the United Nations plays a pivotal role in guiding this sustainable transformation through the One Health approach.

关键词： Modern agriculture One Health Ecosystem Interspecies disease transmission Antimicrobial resistance Sustainable agrifood systems transformation

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Prediction method of physical parameters based on linearized rock physics inversion

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Petroleum Exploration and Development 2020年第1期47卷 59-67页

作者： zhang Jiajia YIN Xingyao zhang guangzhi GU Yipeng FAN Xianggang School of Geosciences China University of Petroleum(East China)Qingdao 266580China Key Laboratory of Deep Oil and Gas Geology and Exploration Ministry of EducationQingdao 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

A linearized rock physics inversion method is proposed to deal with two important issues, rock physical model and inversion algorithm, which restrict the accuracy of rock physics inversion. In this method, first, the complex rock physics model is expanded into Taylor series to get the first-order approximate expression of the inverse problem of rock physics;then the damped least square method is used to solve the linearized rock physics inverse problem directly to get the analytical solution of the rock physics inverse problem. This method does not need global optimization or random sampling, but directly calculates the inverse operation, with high computational efficiency. The theoretical model analysis shows that the linearized rock physical model can be used to approximate the complex rock physics model. The application of actual logging data and seismic data shows that the linearized rock physics inversion method can obtain accurate physical parameters. This method is suitable for linear or slightly non-linear rock physics model, but may not be suitable for highly non-linear rock physics model.

关键词： rock physics inversion linearization physical parameters rock physics model Taylor expansion

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基于扩展方位弹性阻抗的裂缝参数及地应力参数预测方法

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地球物理学报 2022年第8期65卷 3172-3185页

作者：李林张广智中国石油大学(华东)深层油气重点实验室青岛266580 中国石油大学(华东)地球科学与技术学院青岛266580

裂缝参数及水平应力差异比(DHSR)的准确估测对于裂缝预测及水力压裂具有重要意义.扩展弹性阻抗是一种预测弹性参数及物性参数的有效方法,但其并未考虑各向异性的影响,本文将其推广到水平横向各向同性(HTI)介质中,提出一种基于扩展方位... 详细信息

裂缝参数及水平应力差异比(DHSR)的准确估测对于裂缝预测及水力压裂具有重要意义.扩展弹性阻抗是一种预测弹性参数及物性参数的有效方法,但其并未考虑各向异性的影响,本文将其推广到水平横向各向同性(HTI)介质中,提出一种基于扩展方位弹性阻抗的裂缝参数及DHSR预测方法.首先推导HTI介质中的扩展方位弹性阻抗方程及傅里叶系数方程,分析表明扩展方位弹性阻抗的二阶傅里叶系数与裂缝参数及DHSR相关性较好.其次,提出一种柯西稀疏约束和平滑模型约束正则化的贝叶斯地震反演来估测截距阻抗、梯度阻抗及曲率阻抗.最终,结合最优的旋转角和扩展方位弹性阻抗的二阶傅里叶系数实现裂缝参数及DHSR预测.模型测试和实际应用表明,该方法能够得到合理可靠的裂缝参数及DHSR预测结果,有助于指导裂缝发育区域及有利压裂区域的横向识别.

关键词：扩展方位弹性阻抗傅里叶系数裂缝参数水平应力差异比贝叶斯地震反演

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