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Comparison of the Pore Structure of Ultralow-Permeability Reservoirs Between the East and West Subsags of the Lishui Sag Using Constant-Rate Mercury Injection

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Journal of Ocean University of China 2021年第2期20卷 315-328页

作者： WANG Jinkai ZHANG Jinliang shen wenlong LIU Hengyi Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China College of Geological Science and Engineering Shandong University of Science and TechnologyQingdao 266590China CNOOC Ltd. Shanghai BranchShanghai 200335China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

In this study, the differences in reservoir parameters, such as pore radius, throat radius, and pore-throat ratio, between the east and west subsags of the Lishui Sag are analyzed by using data obtained from a constant-rate mercury injection experiment. Furthermore, the quality of the reservoirs in the two subsags is systematically evaluated. Results show that the throat radius of the Lishui west subsag is larger than that of the east subsag, and this parameter has a positive correlation with reservoir quality. However, the pore-throat ratio of the east subsag is larger than that of the west subsag, which has an inverse relationship with reservoir quality. The main reasons for this reservoir difference can be attributed to sedimentation and diagenesis. The sedimentary facies types of the Lishui east subsag are the fan delta, shore lake, shallow lake, and shore shallow lake;their sandstone composition maturity is low;the clay mineral content is high;and the rock has undergone strong diagenesis. Therefore, the physical conditions of the reservoir are poor. However, the sandstones in the Lishui west subsag have weak cementation and compaction, mainly with an intergranular pore structure type, which leads to good connectivity between pores. Therefore, the storage performance and seepage capacity of the Lishui west subsag are better than those of the east subsag;the west subsag is the main area of oil and gas accumulation, as confirmed in the process of exploration and development.

关键词： Lishui Sag constant-rate mercury injection sedimentary facies diagenesis rock pore structure

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Influence of abnormal stress under a residual bearing coal pillar on the stability of a mine entry

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International Journal of Mining Science and Technology 2017年第6期27卷 945-954页

作者： Kang Jizhong shen wenlong Bai Jianbiao Yan Shuai Wang Xiangyu Li Wenfeng Wang Ruofan School of Mines China University of Mining & Technology School of Energy Science and Engineering Henan Polytechnic University Mewbourne School of Petroleum and Geological Engineering University of Oklahoma

Mine entries close to residual bearing coal pillars(RBCPs) will suffer large deformation that may cause rock burst. To better understand the deformation mechanism and develop safe and practical guidelines for entry design, most studies focus on the absolute size of the stress field in and around the pillar. In this paper, we present a new approach to analyze the abnormal stress field close to a RBCP that uses the stress concentration coefficient(SCC), stress gradient(SG), and coefficient of lateral pressure(CLP) to describe the stress state induced by the RBCP. Based on elastic theory and a mathematical model for the abutment stress in the RBCP, an analytical solution for the abnormal stress in the strata below the RBCP was derived and the characteristics of the abnormal stress for a case study of a coal mine in China were analyzed. The results show that the abnormal stress field around the pillar is characterized by four distinct zones: a zone of high SCC, high SG, and CLP less than 1, a zone of high SCC, low SG, and CLP less than 1, a zone of low SCC, SG close to 0, and CLP greater than 1, and a zone of SCC close to 1, SC close to 0, and CLP close to 1. Based on this zoning pattern, a numerical model was established to study the combined effects of the abnormal stress on the stability of the entry. The most stable zone was determined based on a model of the Xinrui coal mine and verified by field measurements at the mine. Our conclusions can be used as guidelines for designing safe entry layouts in similar geological and mining settings.

关键词： Residual bearing coal pillar Abnormal stress Entry layout Mechanical analysis Numerical computation

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Recovery of the Erosion Thickness and Characterization of the Paleogeomorphology in the Southern Lishui Sag, East China Sea Shelf Basin

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Journal of Ocean University of China 2020年第2期19卷 320-330页

作者： LI Na ZHANG Jinliang shen wenlong LIU Yang LIU Huaishan WANG Jinkai XIE Jun Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China CNOOC China Ltd. Shanghai 200335China School of Earth Sciences China University of GeosciencesWuhan 430074China College of Marine Geosciences Ocean University of ChinaQingdao 266100China College of Geological Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

The restoration of the denudation thickness is the basis for quantitatively analyzing the basin burial history,thermal evolution history and hydrocarbon accumulation conditions.The well data is not sufficient to do this in the southern Lishui Sag with only 5 wells,so the new,high-quality three-dimensional(3D)seismic data is essential.The methods employed to determine the eroded thicknesses of key unconformities in the study area are the mudstone acoustic time difference(AC)method,vitrinite reflectance(Ro%)method and stratigraphic trend comparison method.On the basis of the structural evolution,the restoration of the paleogeomorphology is carried out.The results show that the Wenzhou formation(E2 w)in the entire study area has been all denuded.The denudation thickness is in the range of 0–550 m,and decreases gradually from west,thicker than 200 m,to east.The erosion of the upper Lingfeng formation(E1l)are mainly occurred in the N-P-1 structural trap(N-P-1),the N-P-2 structural trap(N-P-2)and the N-P-3 structural trap(N-P-3).Among them,the eroded area in N-P-1(near well S-1)and N-P-2 is 200–230 km^2,and the denudation thickness is 0–600 m,which increases from south to north,even up to 200–400 m in the region around well S-1.In N-P-3,the extent of denudation is 30–50 km^2,and the denudation thickness is 0–400 m.In the early stage of the upper E1 l,one north-south strike slip fault began to develop in the southern study area.Affected by this fault,the southern Lingfeng bulge was offset,forming a gorge,and the eastern and western sides of the concave belt connected to each other.On the basis of the paleo-geomorphological characteristics,it is shown that the sedimentary center of the west subsag began to migrate to the south.

关键词： Oil and gas denudation thickness paleogeomorphology stratigraphic trend Lishui Sag

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酸性压裂液对无烟煤动态断裂行为及能量耗散规律影响研究

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岩石力学与工程学报 2024年第5期43卷 1152-1175页

作者：龚爽张寒松赵毅鑫孙世毅周永恒神文龙河南理工大学能源科学与工程学院河南焦作454003 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454003 中国矿业大学(北京)能源与矿业学院北京100083

为探究冲击荷载作用下酸性压裂液对无烟煤断裂行为及能量耗散规律的影响,利用分离式霍普金森压杆(SHPB)冲击加载系统对酸性压裂液和水基压裂液处理后的直切槽半圆弯曲(NSCB)无烟煤试样开展不同冲击气压下I型动态断裂韧性试验,采用高速... 详细信息

为探究冲击荷载作用下酸性压裂液对无烟煤断裂行为及能量耗散规律的影响,利用分离式霍普金森压杆(SHPB)冲击加载系统对酸性压裂液和水基压裂液处理后的直切槽半圆弯曲(NSCB)无烟煤试样开展不同冲击气压下I型动态断裂韧性试验,采用高速摄像装置记录煤样裂纹扩展过程,结合Image J图像分析软件及PCAS图像识别系统定量分析煤样宏观裂纹扩展轨迹特征及断面细观孔隙概率熵值。通过对比不同冲击气压和压裂液作用下无烟煤样的入射能、吸收能、断裂能和残余动能,得出冲击荷载下酸蚀煤样动态断裂过程的能量耗散规律。研究表明:自然状态煤样的动态断裂韧度最大,酸性压裂液作用煤样在冲击气压高于0.35 MPa后表现出较水基压裂液更低的断裂韧度值,在更高加载气压条件下酸性压裂液处理后煤样的预制裂纹更易起裂。酸性压裂液处理后煤样所需断裂能与水基压裂液组煤样所需断裂能的差值随加载气压的增大不断增加,加载气压越高,酸性压裂液处理后煤样所需断裂能较水基压裂液更少。煤样断面孔隙概率熵值随冲击气压增加而不断增大,酸性压裂液作用使得煤样的断面形貌由致密整齐向疏松多孔转变。针对不同加载速率下压裂液对煤岩断裂行为的弱化和增强双重作用机制进行探讨,基于压裂液的双重性质与线弹性断裂力学理论,建立考虑加载速率的细观断裂力学模型。研究成果可为酸化压裂无烟煤裂纹起裂与扩展机制研究提供试验支撑,为煤层酸化压裂设计及压裂改造中复杂缝网形成机制及调控方法提供理论指导。

关键词：岩石力学无烟煤断裂韧度酸性压裂液裂纹扩展能量耗散

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Numerical modeling of entry position design:A field case

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International Journal of Mining Science and Technology 2018年第6期28卷 985-990页

作者： wenlong shen Tongqiang Xiao Meng Wang Jianbiao Bai Xiangyu Wang School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo 454000China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&TechnologyXuzhou 221116China Collaborative Innovation Center of Coal Work Safety Henan Province Jiaozuo 454000China

In coal mining, roof collapse and support body failure during entry excavation are a common problem.During excavation, entry positions may be subjected to separation, shear-slip, support body failure,and roof collapse. Weak coal-rock interfaces allow for shear-slip between layers, causing anchor bolts and cables to fail. Six entry position models are created to evaluate the failure process and determine the best entry position. Results indicate that roof rocks experience bending and shear-slip along the coal-rock interface. Nearby mining activity causes asymmetric deformation of the entry and shear-slip at the roof corners. When anchor cables and bolts in the roof are insufficient to limit separation and shear-slip, support bodies are subjected to tension, shear, and bending. Once the support body fractures,the entry roof experiences progressive deformation resulting in collapse. We determine the optimal entry position in which shear-slip and residual coal are minimized.

关键词： Entry position Roof failure process Field test Numerical simulation

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Hydrodynamic Characteristics of Undular Tidal Bores in the Qiantang River Based on Field Observations

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China Ocean Engineering 2024年第3期38卷 505-518页

作者： ZHANG Shu-yu PAN Cun-hong ZHANG shen-yang LI Ruo-hua CHENG wenlong XIE Dong-feng Zhejiang Tongji Vocational College of Science and Technology Hangzhou 311231China Zhejiang Institute of Hydraulics and Estuary Hangzhou 310020China

Understanding the undular tidal bores in the Qiantang River is essential for effective river management and maintenance.While breaking tidal bores have been studied extensively, reports on undular tidal bores in the Qiantang Riverremain limited. Furthermore, observed data on undular tidal bores fulfilling the requirements of short measurementtime intervals, and spring, medium, and neap tide coverage, and providing detailed data for the global vertical stratificationof flow velocity are quite limited. Based on field observations at Qige in the Qiantang estuary, we analyzedthe characteristics of undular tidal bores. The results showed that the flooding amplitude (a) of the first wave isalways larger than its ebbing amplitude (b). Moreover, the vertical distribution of the maximum flood velocity exhibitesthree shapes, influenced by the tidal range, while that of the maximum ebb velocity exhibites a single shape. Duringthe initial phase of the flood tide in the spring and medium tides, the upper water body experiences multiple oscillatingchanges along the flow direction, corresponding to the alternating process of the crest and trough of the tide levelupon the arrival of the tidal bore. The tidal range is a crucial parameter in tidal bore hydrodynamics. By establishingthe relationship between hydrodynamic parameters and tidal range, other hydrodynamic parameters, such as the tidalbore height, maximum flood depth–averaged velocity, maximum flood stratified velocity at the measurement points,and duration of the flood tide current, can be effectively predicted, thereby providing an important reference for rivermanagement and maintenance.

关键词： tidal bores Qiantang Estuary tidal bore height tidal bore velocity propagation speed

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Tomography of the dynamic stress coefficient for stress wave prediction in sedimentary rock layer under the mining additional stress

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International Journal of Mining Science and Technology 2021年第4期31卷 653-663页

作者： wenlong shen Guocang Shi Yungang Wang Jianbiao Bai Ruifeng Zhang Xiangyu Wang Henan Key Laboratory for Green and Efficient Mining&Comprehensive Utilization of Mineral Resources School of Energy Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000China Key Laboratory of Deep Coal Resource Mining Ministry of Education State Key Laboratory of Coal Resources and Safe MiningChina University of Mining and TechnologyXuzhou 221116China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Jiaozuo 454000China

In this study,the tomography of dynamic stress coefficient(TDSC)was established based on a mechanical model of stress wave propagation in bedding planes and a mathematical model of the stress wave attenuation in rock masses.The reliability of the TDSC was verified by a linear bedding plane model and field monitoring.Generally,the TDSC in the dynamic stress propagation of bedding planes increases with the following conditions:(1)the increase of the normal stiffness of the bedding plane,(2)the increase of the incident angle of the stress wave,(3)the decrease of the incident frequency of the stress wave,or(4)the growth of three ratios(the ratios of rock densities,elastic moduli,and the Poisson’s ratios)of rocks on either side of bedding planes.The additional stress weakens TDSC linearly and slowly during the stress wave propagation in bedding planes,and the weakening effect increases with the growth of the three ratios.Besides,the TDSC decreases exponentially in the rock mass as propagation distance increases.In a field case,the TDSC decreases significantly as vertical and horizontal distances increase and its wave range increases as vertical distance increases in the sedimentary rock layers.

关键词： Tomography of the dynamic stress coefficient Stress wave attenuation Mining additional stress Sedimentary rock layer

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Joint Bearing Mechanism of Coal Pillar and Backfilling Body in Roadway Backfilling Mining Technology

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Computers, Materials & Continua 2018年第2期54卷 137-159页

作者： Zhengzheng Cao Ping Xu Zhenhua Li Minxia Zhang Yu Zhao wenlong shen School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454000China School of Energy and Engineering Henan Polytechnic UniversityJiaozuo 454000China

In the traditional mining technology,the coal resources trapped beneath surface buildings,railways,and water bodies cannot be mined massively,thereby causing the lower coal recovery and dynamic disasters.In order to solve the aforementioned problems,the roadway backfilling mining technology is developed and the joint bearing mechanism of coal pillar and backfilling body is presented in this paper.The mechanical model of bearing system of coal pillar and backfilling body is established,by analyzing the basic characteristics of overlying strata deformation in roadway backfilling mining technology.According to the Ritz method in energy variation principle,the elastic solution expression of coal pillar deformation is deduced in roadway backfilling mining technology.Based on elastic-viscoelastic correspondence principle,combining with the burgers rheological constitutive model and Laplace transform theory,the viscoelastic solution expression of coal pillar deformation is obtained in roadway backfilling mining technology.By analyzing the compressive mechanical property of backfilling body,the time formula required for coal pillar and backfilling body to play the joint bearing function in roadway backfilling mining technology is obtained.The example analysis indicates that the time is 140 days.The results can be treated as an important basis for theoretical research and process design in roadway backfilling mining technology.

关键词： Roadway backfilling mining technology coal pillar backfilling body joint bearing mechanism energy variation principle

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Rock Stress Around Noncircular Tunnel:a New SimpleMathematicalMethod

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Advances in Applied Mathematics and Mechanics 2017年第6期9卷 1330-1346页

作者： wenlong shen Xiangyu Wang Jianbiao Bai Wenfeng Li Yang Yu School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo 454000HenanChina State Key Laboratory of Coal Resources and Mine Safety China University of Mining&TechnologyXuzhou 221116JiangsuChina Mewbourne School of Petroleum and Geological Engineering University of OklahomaNormanOK 73019USA School of Civil Engineering Xuzhou Institute of TechnologyXuzhou 221008JiangsuChina

Anewsimplemathematicalmethod has been proposed to predict rock stress around a noncircular tunnel and themethod is calibrated and validatedwith a numerical model.It can be found that the tunnel shapes and polar angles affect the applicable zone of the theoretical model significantly and the applicable zone of a rectangular tunnel was obtained using this method.The method can be used to predict the values of the concentrated stress,and to analyze the change rate of rock stress and back to calculate the mechanical boundary condition in the applicable zone.The results of the stress change rate indicate that the horizontal stress is negatively related to the vertical boundary load and positively related to the horizontal boundary load.The vertical stress is negatively related to the horizontal boundary load and positively related to the vertical boundary load.These findings can be used to explain the evolution of the vertical increment in stress obtained with field-based borehole stress monitoring.

关键词： Rock stress mathematical model noncircular tunnel applicable zone stress change rate numerical simulation

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Classification and Visualization of Surrounding Rock Mass Stability Based on Multi-Dimensional Cloud Model

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Energy Engineering 2021年第6期118卷 1799-1810页

作者： Liming Xue wenlong shen Zhixue Zheng Jiming Chen Hongtao Liu China University of Mining&Technology(Beijing) Beijing100083China Peking University Beijing100871China China Three Gorges Projects Development Co. Ltd.Chengdu610041China

The classification of the stability of surrounding rock is an uncertain system with multiple indices.The Multidimensional Cloud Model provides an advanced solution through the use of an improved model of One-dimensional Cloud Model.Setting each index as a one-dimensional attribute,the Multi-dimensional Cloud Model can set the digital characteristics of each index according to the cloud theory.The Multi-dimensional cloud generator can calculate the certainty of each grade,and then determine the stability levels of the surrounding rock according to the principle of maximum certainty.Using this model to 5 coal mine roadway surrounding rock examples and comparing the results with those of One-dimensional and Two-dimensional Cloud Models,we find that the Multi-dimensional Cloud Model can provide a more accurate solution.Since the classification results of the Multidimensional Cloud Model are difficult to be presented intuitively and visually,we reduce the Multi-dimensional Cloud Model to One-dimensional and Two-dimensional Cloud Models in order to visualize the results achieved by the Multi-dimensional Cloud Model.This approach provides a more accurate and intuitive method for the classification of the surrounding rock stability,and it can also be applied to other types of classification problems.

关键词： Multi-dimensional cloud model surrounding rock stability uncertain visualization

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