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Earthquake Science 2011年第5期24卷 437-445页

作者： Guijuan Lai Fuqiong Huang hongkui ge Institute of geophysics China Earthquake Administration Beijing 100081 China China Earthquake Networks Center Beijing 100045 China

t Taking the M2 wave as calibration signals, we extract the phase shifts of the water level relative to the Earth tide in the Zhouzhi well by utilizing the cross-correlation function. And we further obtain the apparent permeability variation in the aquifer of the Zhouzhi well in 2008. Comparison with the commonly used tidal analysis software Baytap-G shows that phase shifts obtained by cross-correlation function are more stable. The resulting apparent permeability of the Zhouzhi well aquifer fluctuates with time, indicating it is a dynamically controlled parameter. The 2008 Wenchuan earthquake caused the apparent permeability increasing drastically, which is interpreted as the combination effects of effective stress changes and the barriers removing in the flow channel due to seismic wave pressure pulse. After the Wenchuan earthquake, the effective stress began to recover and the impurities deposited gradually, causing the apparent permeability to decrease a month later and almost recover to the pre-earthquake level in six months.

关键词： apparent permeability Zhouzhi well underground water Earth tide 2008 Wenchuanearth〈tuake

Semiannual velocity variations around the 2008 M_w 7.9 Wenchuan Earthquake fault zone revealed by ambient noise and ACROSS active source data

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Earthquake Science 2014年第5期27卷 529-540页

作者： Haichao Chen hongkui ge Fenglin Niu Key Laboratory of Seismic Observation and geophysical Imaging Institute of GeophysicsChina Earthquake Administration Unconventional Natural Gas Institute China University of Petroleum Department of Earth Science Rice University

We continuously monitor the long-term seismic velocity variation of one of the major ruptured faults of the devastating 2008 Mw7.9 Wenchuan earthquake in China from July 2009 to January 2012,jointly using accurately controlled routinely operated signal system active source and seismic noise-based monitoring *** measurements show that the temporal velocity change is not homogeneous and highly localized in the damaged fault zone and the adjacent *** variations from the active and passive methods are quite consistent,which both are characterized by ±0.2 % seasonal variation,with peak and trough at winter and summer,*** periodic velocity variation within fault zone exhibits remarkably positive correlation with barometric pressure with stress sensitivity in the order of 10-6Pa-1,suggesting that the plausible mechanism might be the crack density variation of the shallow subsurface medium of the damaged fault zone in response to the cyclic barometric pressure loading.

关键词： Velocity variation - 2008 WenchuanEarthquake ACROSS active source Ambient noise

A Numerical Study on Hydraulic Fracturing Problems via the Proper generalized Decomposition Method

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 703-720页

作者： Daobing Wang Sergio Zlotnik Pedro Díez hongkui ge Fujian Zhou Bo Yu School of Mechanical Engineering Beijing Key Laboratory of Pipeline Critical Technology and Equipment for Deepwater Oil&Gas DevelopmentBeijing Institute of Petrochemical TechnologyBeijing102617China. Laboratori de Càlcul Numèric(LaCàN) ETS de Ingeniero de CaminosCanales y PuertosUniversitat Politècnica de CatalunyaBarcelonaE-08034Spain. Research Institute of Unconventional Oil and Gas Science and Technology China University of PetroleumBeijing102249China. Department of Oil&Gas Transportation and Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China.

The hydraulic fracturing is a nonlinear,fluid-solid coupling and transient problem,in most cases it is always time-consuming to simulate this process *** recent years,although many numerical methods were proposed to settle this problem,most of them still require a large amount of computer *** it is a high demand to develop more efficient numerical approaches to achieve the real-time monitoring of the fracture geometry during the hydraulic fracturing *** this study,a reduced order modeling technique namely Proper generalized Decomposition(PGD),is applied to accelerate the simulations of the transient,non-linear coupled system of hydraulic fracturing problem,to match this extremely tight response time *** separability of the solution in space and time dimensions is studied for a simplified model *** solid and fluid equations are coupled explicitly by inverting the solid discrete problem,and a simple iterative procedure to handle the non-linear characteristic of the hydraulic fracturing problem is proposed in this *** validation illustrates that the results of PGD match well with these of standard finite element method in terms o f fracture opening and fluid pressure in the ***,after the off-line calculations,the numerical results can be obtained in real time.

关键词： Hydraulic fracturing proper generalized decomposition reduced order modeling numerical simulation.

页岩油储层压裂-提采一体化研究进展与面临的挑战

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石油钻探技术 2024年第1期52卷 84-95页

作者：张衍君王鲁瑀刘娅菲张佳亮周德胜葛洪魁西安石油大学石油工程学院陕西西安710065 香港理工大学土木及环境工程系中国香港999077 中国石油大学(北京)非常规油气科学技术研究院北京102249

页岩油储层压裂开发中,以远超地层吸收能力的注入速率向储层注入包含各类添加剂的工作液,基本完成了压裂介质一次注入、油井开发全生命周期受益的使命。其中,2个问题尤为关键:1)如何形成均匀展布的裂缝网络,增大裂缝和储层的接触面积、... 详细信息

页岩油储层压裂开发中,以远超地层吸收能力的注入速率向储层注入包含各类添加剂的工作液,基本完成了压裂介质一次注入、油井开发全生命周期受益的使命。其中,2个问题尤为关键:1)如何形成均匀展布的裂缝网络,增大裂缝和储层的接触面积、提高液体流动效率?2)在形成高效传压传质缝网的基础上,存地压裂液如何提高储层中原油的可动性?压裂和提采一体化是解决上述问题的重要思路。为此,阐述了页岩油储层压裂-提采一体化的内涵,归纳了实现压裂-提采一体化的模拟和试验技术;明确了页岩油储层压裂-提采一体化的科学问题:均衡应力压裂形成均匀展布的缝网,提高均布缝网中流体流动与传输的效率,强化基质孔隙中油气的动用。同时,指出了压裂-提采一体化面临的挑战:明确裂缝非均匀扩展导致的压裂井间干扰机理并建立控制方法,形成裂缝中高压流体高效作用于基质孔隙的途径,揭示压裂液-储层-原油相互作用提高原油可动性机理。研究结果表明:形成均布的裂缝网络是控制裂缝-基质传压传质及流体流动的基础,通过强化压裂液-储层-原油之间的相互作用动用赋存于微-纳米孔隙中的原油是核心,将压裂-提采一体化应用于页岩油储层开发是实现经济最大化的有效途径。贯彻和落实压裂-提采一体化的理念,对页岩油储层的高效开发具有重要意义。

关键词：页岩油压裂-提采一体化均衡应力压裂原油可动性流体流动

A new way to generate seismic waves for continental crustal exploration

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Chinese Science Bulletin 2007年第16期52卷 2264-2268页

作者： CHEN Yong ZHANG XianKang QIU XueLin ge hongkui LIU BaoJin WANG BaoShan Institute of geophysics China Earthquake Administration Beijing 100081 China geophysical Exploration Center China Earthquake Administration Zhengzhou 450002 China CAS Key Laboratory of Marginal Sea geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

An airgun experiment was conducted in a reservoir,with the total volume of the airgun array being 6000 cubic inch. The energy released by one excitation was estimated to be 6.68×106 J,which corresponded to a 3.4 kg TNT explosion. A 180 km long profile composed of 100 portable short period seismometers was deployed as a receiver system of the airgun signals. Two remarkable results can be drawn from the experiment: (1) the airgun explosion is harmless to the dam and the fish,and this kind of airguns can be regarded as a green and environmental protection seismic source on land; (2) seismic wave gener-ated by this airgun source can be recorded by permanent stations with offset larger than 200 km. And the wave amplitudes recorded by nearby and remote stations are equivalent to the wave generated by 800 kg dynamite explosion. The airguns can be used as a light to illuminate the continental crustal structure of an area of about 100000 km2.

关键词：地震波地壳探测环境保护震源

Monitoring the Modal Frequency and Velocity Variations of Bridges under Ambient Excitation

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Earthquake Research in China 2015年第4期29卷 554-566页

作者： Chen Haichao ge hongkui Meng Fanbao Wang Xiaoqiong Yang Wei Unconventional Natural Gas Institute China University of Petroleum-Beijing Institute of geophysics China Earthquake Administration

We conducted a long-term monitoring experiment on the Lutuanxilu Bridge located in Changping District of Beijing, employing our recently developed real-time bridge monitoring system based on the Guralp CMG-6TD broadband seismometer. We identified the modal parameters with the stochastic subspace identification( SSI) algorithm,and continuously monitored the temporal velocity variation with coda wave *** results show that:( 1) the highly sensitive Guralp CMG-6TD broadband seismometer,which records the three-component vibration signal within broad frequency range,is well suited for long-term bridge health monitoring.( 2) With the continuous vibration signal from ambient excitation,the stochastic subspace algorithm can robustly identify the low-order modal parameters and the coda wave interferometry can accurately monitor the tiny velocity variation.( 3) The elastic modulus of bridge materials changes significantly associated with varying temperature,leading to diurnal velocity variation with amplitude of approximately 1%. The velocity variation shows strong negative correlation with temperature fluctuation. Meanwhile,the modal frequencies remain quite stable,suggesting that the velocity variation may be a more sensitive quantitative damage index.( 4) While the modal frequencies reflect the integrated health status of the bridge,the velocity variation can be utilized to monitor the local elastic modulus. Therefore,it is crucial for bridge health monitoring to continuously monitor the two key damage indexes under ambient excitation.

关键词： Ambient excitation Stochastic subspace Identification Coda wave interferometry Modal frequency Velocity variation

Active source monitoring at the Wenchuan fault zone:coseismic velocity change associated with aftershock event and its implication

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Earthquake Science 2014年第6期27卷 599-606页

作者： Wei Yang hongkui ge Baoshan Wang Jiupeng Hu Songyong Yuan Sen Qiao Key Laboratory of Seismic Observation and geophysical Imaging Institute of Geophysics China Earthquake Administration Unconventional Natural Gas Institute China University of Petroleum

With the improvement of seismic observation system, more and more observations indicate that earthquakes may cause seismic velocity change. However, the amplitude and spatial distribution of the velocity variation remains a controversial issue. Recent active source monitoring carried out adjacent to Wenchuan Fault Scientific Drilling （WFSD） revealed unambiguous coseismic velocity change associated with a local M8 5.5 earthquake. Here, we carry out forward modeling using two-dimensional spectral element method to further investigate the amplitude and spatial distribution of observed velocity change. The model is well constrained by results from seismic reflection and WFSD coring. Our model strongly suggests that the observed coseismic velocity change is localized within the fault zone with width of ~ 120 m rather than dynamic strong ground shaking. And a velocity decrease of -2.0 % within the fault zone is required to fit the observed travel time delay distribution, which coincides with rock mechanical experiment and theoretical modeling.

关键词： Wenchuan fault zone Coseismic velocity change Accurately Controlled Routinely Operated Seismic Source (ACROSS) Active monitoring Forward modeling

Practices and Advances in Exploring the Subsurface Structure and Its Temporal Evolution with Repeatable Artificial Sources

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Earthquake Research in China 2016年第3期30卷 284-297页

作者： Wang Baoshan ge hongkui Wang Bin Wang Haitao Zhang Yuansheng CaiHuiteng Chen Yong Key Laboratory of Seismic Observation and geophysical Imaging Institute of Geophysics CEA Beijing 100081 China China Petroleum University (Beijing) Beijing 102249 China Earthquake Administration of Yunnan Province Kunming 650224 China Earthquake Administration of Xinjiang Uygur Autonomous Region Urumqi 830011 China Lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China Earthquake Administration of Fujian Province Fuzhou 350003 China

The earth's structure may change with time under natural or anthropogenic *** the subtle changes of the subsurface structure with repeatable seismic sources such as repeating earthquakes,ambient seismic noise and artificial sources has become one of the hot topics in seismological research. These studies provide important clues in understanding the physical process of hazardous events such as earthquakes and volcanic eruptions. In this review we introduce the practices and advances in exploring and monitoring the subsurface structure with artificial seismic sources. This review is orgainzed as follows. Firstly,we describe the studies on the characteristics of different types of seismic source( especially the airgun source). Then the advances on data processing and mechanical understanding are depicted. At the end of this review,we reveal the prospects of future study of exploration and monitoring of the subsurface structure and its temporal variations using artificial sources.

关键词： Artificial source Large volume airgun Subsurface changes

Experimental Study of the Main Influencing Factors in Mechanical Properties of Conglomerate

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Earthquake Research in China 2020年第3期34卷 430-451页

作者： ZHOU Bo ge hongkui ZHOU Wei WANG Jianbo HAO Hongyong WANG Xiaoqiong LIU Pengyu Research Institute of Experiment and Detection of Xinjiang Oilfield Company Karamay 834000China Xinjiang Laboratory of Petroleum Reserve in Conglomerate Karamay 834000China Unconventional Oil and Gas Technology Research Institute China University of PetroleumBeijing 102249China China University of Petroleum-Beijing At Karamay Karamay 834000China

In recent years,with the success of exploration and development of conglomerate reservoirs in Mahu Depression,Junggar Basin,China,it is urgent to study the mechanical properties and its influencing factors of conglomerate which is considered as a new oil and gas *** on the investigations of petrologic characteristics,heterogeneity and mechanical properties of conglomerate in Baikouquan formation,the content and geometric characteristics of gravel in conglomerate,the main factors in heterogeneity and the mechanical behavior in the triaxial compression experiment of conglomerate are analyzed in this *** results show that the size and content of gravel in conglomerate varies greatly,and conglomerate has strong heterogeneity under the influence of gravel content and *** analysis of mechanical properties of conglomerate shows that conglomerate is characterized by ***,the sphericity is negatively correlated to the gravel content,while the heterogeneity increases with the increase of conglomerate *** to the existence of heterogeneous gravel,local stress may concentrate in conglomerate when the stress is ***,a large number of micro-cracks appear at the edge of gravel,demonstrating the strong plasticity of *** paper is of referential significance to the study of rock mechanical properties and the evaluation of engineering properties in conglomerate development.

关键词： Conglomerate Petrological characteristics Heterogeneity Mechanical properties Plasticity

Study of the Reservoir Damage during Cyclic Injection and Extraction Process in the Hutubi Gas Storage

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Earthquake Research in China 2018年第2期32卷 288-300页

作者： Wang Jianbo ge hongkui Wang Xiaoqiong Liu Tongyuan Liu Dunqing Zhang Yanjun Wu Shan Unconventional Natural Gas Research Institute China University of PetroleumBeijing 102249China China University of Petroleum(Beijing)at Karamay Karamay 834000XinjiangChina

During the injection and extraction process in gas storage,cyclic loading stress is applied to the reservoir pore structure,affecting the capacity and service life of gas storage. To study the influence of cyclic injection and extraction on reservoir physical property,a finite-element model of reservoir elastoplastic damage under the effect of pore pressure is established based on elastoplastic mechanics and fatigue-damage mechanics. Considering the mechanical property of the Hutubi reservoir and the injection-extraction mode of gas storage,the finite-element model is used to study the pore pressure and porosity change,fault safety,and ground surface deformation. The results show that the change in pore pressure and porosity,the deformation of the Hutubi fault,as well as the uplift and sink of the grounds surface are controlled by the fatigue damage of the reservoir pore structure during the injection-extraction process. After a 6-year service life, the cumulative deformation of the reservoir pore reaches its limit,causing pore structure collapse and porosity decrease. As a result,storage capacity declines and the ground surface starts to sink. Through this study,the safety of the Hutubi gas storage is evaluated,and some suggestions for field operations are offered.

关键词： Gas storage Injected/extracted Fatigue damage Porosity