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Petroleum Science 2024年第2期21卷 1171-1189页

作者： Kun-Peng Zhang Mian Chen Chang-Jun Zhao Su Wang Yong-Dong Fan State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China MOE Key Laboratory of Petroleum Engineering in China University of Petroleum Beijing102249China Beijing International Center for Gas Hydrate School of Earth and Space SciencesPeking UniversityBeijing100871China

A method for in-situ stress measurement via fiber optics was proposed. The method utilizes the relationship between rock mass elastic parameters and in-situ stress. The approach offers the advantage of long-term stress measurements with high spatial resolution and frequency, significantly enhancing the ability to measure in-situ stress. The sensing casing, spirally wrapped with fiber optic, is cemented into the formation to establish a formation sensing nerve. Injecting fluid into the casing generates strain disturbance, establishing the relationship between rock mass properties and treatment ***, an optimization algorithm is established to invert the elastic parameters of formation via fiber optic strains. In the first part of this paper series, we established the theoretical basis for the inverse differential strain analysis method for in-situ stress measurement, which was subsequently verified using an analytical model. This paper is the fundamental basis for the inverse differential strain analysis method.

关键词： in-situ stress Fiber optic Orthotropic elastic Differential evolution ABAQUS

in-situ stress distribution and coalbed methane reservoir permeability in the Linxing area, eastern Ordos Basin, China

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Frontiers of Earth Science 2018年第3期12卷 545-554页

作者： Wei JU Jian SHEN Yong QIN Shangzhi MENG Chao LI Guozhang LI Guang YANG Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of Education China University of Mining and Technology Xuzhou 221008 China School of Resources and Geosciences China-University of Mining and Technology Xuzhou 221116 China China United Coalbed Methane Corporation Ltd. Beijing 100011 China

Understanding the distribution of in-situ stresses is extremely important in a wide range of fields such as oil and gas exploration and development, CO2 sequestration, borehole stability, and stress-related geohazards assessment. In the present study, the in-situ stress distribution in the Linxing area of eastern Ordos Basin, China, was analyzed based on well tested parameters. The maximum horizontal principal stress （SHmax）, minimum horizontal principal stress （Shmin）, and vertical stress （Sv） were calculated, and they were linearly correlated with burial depth. In general, two types of in-situ stress fields were determined in the Linxing area：（i） the in-situ stress state followed the relation Sv 〉 Snmax 〉 Shmin in shallow layers with burial depths of less than about 940 m, indicating a normal faulting stress regime; （ii） the Snmax magnitude increased conspicuously and was greater than the Sv magnitude in deep layers with depths more than about 940 m, and the in-situ stress state followed the relation Snmax 〉 Sv 〉 Shmin, demonstrating a strike-slip faulting stress regime. The horizontal differential stress （Snmax-Shmtn） increased with burial depth, indicating that wellbore instability may be a potentially significant problem when drilling deep vertical wells. The lateral stress coefficient ranged from 0.73 to 1.08 with an average of 0.93 in the Linxing area. The coalbed methane （CBM） reservoir permeability was also analyzed. No obvious exponential relationship was found between coal permeability and effective in-situ stress magnitude. Coal permeability was relatively high under a larger effective in-situ stress magnitude. Multiple factors, including fracture development, contribute to the variation of CBM reservoir permeability in the Linxing area of eastern Ordos Basin.

关键词： in-situ stress coalbed methane permeability lateral stress coefficient Linxing area Ordos Basin

in-situ stress inversion in Liard Basin, Canada, from caliper logs

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Petroleum 2020年第4期6卷 392-403页

作者： Hongxue Han Shunde Yin Civil and Environmental Engineering University of WaterlooONN2L 3G1Canada

This paper proposes an integrated method of analytical calculation,artificial intelligence,and probabilistic analysis to cost-effectively determine geomechanical properties and in-situ stresses from borehole deformation via caliper ***'s also demonstrated in this paper that the actual borehole size can not be simply taken as the bit size by default,and adjusted borehole size has to be used to find the reasonable borehole *** the proposed method,an artificial neural network(ANN)is applied to map the relationship among in-situ stress,adjusted borehole size,geomechanical properties,and borehole *** genetic algorithm(GA)searches for the set of unknown stresses and geomechanical properties that match the objective borehole deformation *** analysis is conducted after ANN-GA modeling to estimate the most possible ranges of the *** hybrid method has been demonstrated by a field case study to estimate the adjusted borehole size,Young's modulus,and the two horizontal in-situ stresses using borehole deformation information reported from four-arm caliper logs of a vertical borehole in Liard Basin in Canada.

关键词： Adjusted borehole size in-situ stress Caliper log Borehole deformation Artificial neural network Genetic algorithm Probabilistic analysis

in-situ stress of coal reservoirs in the Zhengzhuang area of the southern Qinshui Basin and its effects on coalbed methane development

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能源地球科学(英文) 2023年第2期4卷 17-27页

作者： Peng Zhang Ya Meng Chaoying Liu Yuanling Guo Xiangbin Yan Lixue Cai Zhe Cheng Petroleum Exploration and Development Research Institute SINOPECBeijing100083China Science and Technology Department SINOPECBeijing100728China School of Energy Resources China University of Geosciences(Beijing)Beijing100083China

in-situ stress is a critical factor influencing the permeability of coal reservoirs and the production capacity of coalbed methane(CBM)*** prediction of in-situ stress and investigation of its influence on coal reservoir permeability and production capacity are significant for CBM *** study investigated the CBM development zone in the Zhengzhuang area of the Qinshui *** to the low mechanical strength of coal reservoirs,this study derived a calculation model of the in-situ stress of coal reservoirs based on the multi-loop hydraulic fracturing method and analyzed the impacts of initial fractures on the calculated ***,by combining the data such as the in-situ stress,permeability,and drainage and recovery data of CBM wells,this study revealed the spatial distribution patterns of the current in-situ stress of the coal reservoirs and discussed the impacts of the insitu stress on the permeability and production *** results are as follows.(1)Under given fracturing pressure,longer initial fractures are associated with higher calculated maximum horizontal principal stress ***,ignoring the effects of the initial fractures will cause the calculated values of the in-situ stress to be less than the actual values.(2)As the burial depth increases,the fracturing pressure,closure pressure,and the maximum and minimum horizontal principal stress of the coal reservoirs in the Zhengzhuang area constantly *** average gradients of the maximum and minimum horizontal principal stress are 3.17 MPa/100 m and 2.05 MPa/100 m,respectively.(3)Coal reservoir permeability is significantly controlled by the magnitude and state of the current in-situ *** coal reservoir permeability decreases exponentially with an increase in the effective principal ***,a low lateral pressure coefficient(less than 1)is associated with minor horizontal compressive effects and high coal reservoir permeability.(4)Under simil

关键词： in-situ stress Coal reservoir Multi-loop hydraulic fracturing method Permeability Production capacity

Comparison between double caliper,imaging logs,and array sonic log for determining the in-situ stress direction:A case study from the ultra-deep fractured tight sandstone reservoirs,the Cretaceous Bashijiqike Formation in Keshen8 region of Kuqa depress

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Petroleum Science 2022年第6期19卷 2601-2617页

作者： Song Wang Gui-Wen Wang Dong Li Xing-Neng Wu Xu Chen Qi-Qi Wang Jun-Tao Cao Yi-Lin Zhang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum BeijingBeijing102249China College of Geosciences China University of Petroleum BeijingBeijing102249China Research Institute of Petroleum Exploration and Development Tarim Oilfield CompanyCNPCKorla841000XinjiangChina Department of Geological Sciences University of Texas at Austin2275 Speedway Stop C9000AustinTX78712USA

The tight sandstone in the Tarim Basin has the characteristics of large burial depth and development of nature fractures due to concentrated in-situ stress. Identifying the present-day in-situ stress orientation is important in hydrocarbon exploration and development, but also a key scientific question in understanding naturally fractured reservoirs. This paper presents a case study where we integrate various methods using wireline and image-log data, to identify present-day in-situ stress direction of ultra-deep fractured tight sandstone reservoirs, in the Kuqa depression. We discuss the formation mechanism of the elliptical borehole, compares the advantages and applicable conditions of the double caliper method,resistivity image logs and array sonic logs method. The well borehole diameter is measured orthogonally,then the ellipse is fitted, and the in-situ stress orientation is identified by the azimuth of the short-axis borehole, but it fails in the borehole expansion section, the fracture development section and the borehole collapse section. The micro-resistivity image logs method reveals the borehole breakouts azimuth, and also the strike of induced fractures, which are used to determine the orientation of in-situ stress. However, under water-based mud conditions, it’s hard to distinguish natural fractures from induced fractures by image logs. Under oil-based mud conditions, the induced fractures are difficult to identify due to the compromised image quality. As for the sonic log, shear waves will split when passing through an anisotropic formation, shear waves will split during propagation, and the azimuth of fast shear waves is consistent with the orientation of in-situ stress. However, it is usually affected by the anisotropy caused by the excessively fast rotation of the well log tools, so that the azimuth of fast shear wave cannot effectively reflect the orientation of the in-situ stress. Based on comprehensive assessment and comparison, in this paper we

关键词： Fractured tight sandstone in-situ stress Orientation Well logs

Influence of mountain-valley morphology on in-situ stress distribution

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Journal of Mountain Science 2021年第9期18卷 2447-2459页

作者： ZHANG Chuan-qing CUI Guo-jian ZHOU Hui YANG Fan-jie LU Jing-jing State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

The in-situ stress field is a key factor controlling the successful construction of a large number of underground structures in mountainous areas,and is intensively affected by the mountainvalley *** effects of mountain-valley morphology(the width of the mountain top platform,mountain height,slope angle,and width of the valley bottom)on the distribution of the in-situ stress field were analyzed and interpreted using numerical modeling techniques,where the spatial distribution and maximum values of the horizontal and vertical stresses were *** results showed that there existed a critical value of the topographic influence depth,where the in-situ stress distribution varied significantly as mountain-valley morphology,after which the influence *** action has a more remarkable influence on the in-situ stress distribution than gravitational action under the same mountain-valley ***,the relationships between the magnitudes of these stress components and the morphology variables are described using empirical formulas,which can be directly applied to different topographies to rapidly achieve a rational *** findings of this study can be very useful for quickly understanding the in-situ stress distribution and as stress measurement guidelines.

关键词： in-situ stress Mountain-valley morphology Gravitational action Tectonic action

DDM regression analysis of the in-situ stress field in a non-linear fault zone

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International Journal of Minerals,Metallurgy and Materials 2012年第7期19卷 567-573页

作者： Ke Li Ying-yi Wang Xing-chun Huang School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200240 China Chinese Underwater Technology Institute Shanghai Jiaotong University Shanghai 200231 China

A multivariable regression analysis of the in-situ stress field, which considers the non-linear deformation behavior of faults in practical projects, is presented based on a newly developed three-dimensional displacement discontinuity method （DDM） program. The Bar- ton-Bandis model and the Kulhaway model are adopted as the normal and the tangential deformation model of faults, respectively, where the Mohr-Coulomb failure criterion is satisfied. In practical projects, the values of the mechanical parameters of rock and faults are restricted in a bounded range for in-situ test, and the optimal mechanical parameters are obtained from this range by a loop. Comparing with the traditional finite element method （FEM）, the DDM regression results are more accurate.

关键词： displacement discontinuity method (DDM) in-situ stress regression analysis faults rock

Estimation of the horizontal in-situ stress magnitude and azimuth using previous drilling data

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Petroleum 2023年第3期9卷 352-363页

作者： Masoud Ziaie Mohammad Fazaelizadeh Abbas Ayatizadeh Tanha Ali Sharifzadegan Department of Petroleum Engineering Tarbiat Modares UniversityTehranIran Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran Department of Petroleum Engineering Faculty of PetroleumGas and Petrochemical EngineeringPersian Gulf UniversityBushehrIran

Oil exploration and production,well stability,sand production,geothermal drilling,waste-water or CO_(2) sequestration,geohazards assessment,and EOR processes such as hydraulic fracturing,require adequate information about in-situ *** are several methods for analyzing the magnitude and direction of in-situ *** evaluation of tensile fractures and shear fractures in vertical oil and gas wellbores using image logs is one of these ***,when image logs are run in boreholes,they can be extremely costly and possibly stop the *** data for this study were gathered from seven directional wells drilled into a strike-slip fault reservoir in southern *** stress,minimum horizontal stress,pore pressure,Poisson's ratio of formations,and 233 mud loss reporting points make up the entire *** is the first time maximum horizontal stress direction has been calculated without referring to image log *** addition,the points of lost circulation were categorized into natural and induced *** results revealed that,the maximum horizontal stress direction of the reservoir was calculated at 65*** error rate is roughly 10when comparing the results of this investigation to those obtained from the image *** maximum horizontal stress direction is calculated *** terms of tensile fracture pressure,the in-situ stress ratio identifies the safest as well as the most critical inclination and azimuth for each well.

关键词： Well instability Lost circulation Drilling induced tensile fracture Image log in-situ stress Horizontal stress direction

Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling

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Underground Space 2023年第4期11卷 96-115页

作者： Xudong Li Kewei Liu Jiacai Yang Yanyan Sha Ruitao Song School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavanger 4021Norway

In the present study,a numerical model is first calibrated against the crack networks and pressure attenuation data in laboratory blasting ***,based on the calibrated numerical model,two-hole plane models are developed and used to perform a series of sim-ulations of smoothwall blasting in deep tunnelling subjected to in-situ *** evolutions of rock fracture and excavation damage zone in the roof/floor and sidewalls under different far-field hydrostatic pressure and anisotropic in-situ stress conditions are numerically *** findings in numerical modelling are also analytically interpreted with the stress distributions around the designed tunnel perimeter and perimeter *** numerical and analytical results show that the variations of rock cracking and excavation dam-aged zone induced by smoothwall blasting with in-situ stress are mainly attributed to the high tangential compressive stress concentration around the remaining rock after inner primary blasts and the tensile stress acting on the wall of perimeter hole,which control the crack propagation and initiation *** last,the implications of findings for practical smoothwall blasting in deep tunnelling are discussed.

关键词： Smoothwall blasting in-situ stress Crack propagation Excavation damaged zone stress distribution Numerical simulation

Time-sensitivity of the Kaiser effect of acoustic emission in limestone and its application to measurements of in-situ stress

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Petroleum Science 2009年第2期6卷 176-180页

作者： Jin Yan Qi Zili Chen Mian Zhang Guangqing Xu Guangqiang Key Laboratory of Petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China

Measuring in-situ stress by using the Kaiser effect in rocks has such advantages as timeefficiency, low cost and little limitation, but the precision of the method is dependent on rock properties and delay time of the measurement. In this paper, experiments on the Kaiser effect in limestones were performed, and it was found that the limestones had good ability to retain a memory of their recent stress history and high time-sensitivity. The longer the experiment was delayed from the extraction of the stone, the larger the Felicity ratio was. As the Felicity ratio approached l, significant Kaiser effect was observed. in-situ stress should be determined by the limestone measurements when the delay time was 40-120 days. Finally, the in-situ stress in a limestone formation could be successfully measured in practice.

关键词： in-situ stress Kaiser effect limestone time sensitivity