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The Relationship between Fractures and tectonic stress field in the Extra Low-Permeability Sandstone Reservoir at the South of Western Sichuan Depression

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Journal of China University of Geosciences 2007年第3期18卷 223-231页

作者：曾联波漆家福李跃纲 Key Laboratory for Hydrocarbon Accumulation in China University of Petroleum Ministry of Education Faculty of Resource and Information China University of PetroleumBeijing 102249China Northwest Sichuan Gas field Southwest Oil and Gas Field BranchPetroChina Company Limited

The formation and distribution of fractures are controlled by paleotectonic stress field, and their preservative status and effects on development are dominated by the modern stress field. Since Triassic, it has experienced four tectonic movements and developed four sets of tectonic fractures in the extra low-permeability sandstone reservoir at the south of western Sichuan depression. The strikes of fractures are in the S-N, NE-SW, E-W, and NW-SE directions respectively. At the end of Triassic, under the horizontal compression tectonic stress field, for which the maximum principal stress direction was ***, the fractures were well developed near the S-N faults and at the end of NE-SW faults, because of their stress concentration. At the end of Cretaceous, in the horizontal compression stress fields of the NE-SW direction, the stress was obviously lower near the NE-SW faults, thus, fractures mainly developed near the S-N faults. At the end of Neogene-Early Pleistocene, under the horizontal compression tectonic stress fields of E-W direction, stress concentrated near the NE-SW faults and fractures developed at these places, especially at the end of the NE-SE faults, the cross positions of NE-SW, and S-N faults. Therefore, fractures developed mostly near S-N faults and NE-SW faults. At the cross positions of the above two sets of faults, the degree of development of the fractures was the highest. Under the modern stress field of the NW-SE direction, the NW-SE fractures were mainly the seepage ones with tensional state, the best connectivity, the widest aperture, the highest permeability, and the minimum opening pressure.

关键词： fracture tectonic stress field extra low-permeability reservoir south of western Sichuan depression

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Evolution of 3D tectonic stress field and fault movement in North China

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Acta Seismologica Sinica(English Edition) 2001年第4期14卷 371-383页

作者：陈连旺陆远忠郭若眉许桂林张杰 Institute of Crustal Dynamics China Seismological Bureau Seismological Bureau of Beijing

Based on data of fault movement surveying, we simulate the evolution process of three dimensional stress field in North China by three dimensional finite element method. Evolutional patterns in one-year time scale from 1986 to 1997 have been illustrated and the evolution characteristics of stress field have been analyzed. In comparison with the seismic activity among that time interval in North China, we have primarily discussed the relationship between the evolution of stress field and seismic activity.

关键词： North China fault displacement tectonic stress field evolutional pattern 3D finite element model

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End Late Paleozoic tectonic stress field in the southern edge of Junggar Basin

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Geoscience Frontiers 2012年第5期3卷 707-715页

作者： Wei Ju Guiting Hou Le Li Fangfeng Xiao The Key Laboratory of Orogenic Belts and Crustal Ew~lution Ministry of Education School of Earth and Space Science PekingUniversity Beijing 100871 China Institute of Oil and Gas Research Peking University Beijing 100871 China

This paper presents the end Late Paleozoic tectonic stress field in the southern edge of Junggar Basin by interpreting stress-response structures （dykes, folds, faults with slickenside and conjugate joints）. The direction of the maximum principal stress axes is interpreted to be NW-SE （about 325°）, and the accommodated motion among plates is assigned as the driving force of this tectonic stress field. The average value of the stress index Rt is about 2.09, which indicates a variation from strike-slip to compressive tectonic stress regime in the study area during the end Late Paleozoic period. The reconstruction of the tectonic field in the southern edge of Junggar Basin provides insights into the tectonic deformation processes around the southern Junggar Basin and contributes to the further understanding of basin evolution and tectonic settings during the culmination of the Paleo- zoic.

关键词： tectonic stress field Junggar Basin End Late Paleozoic stress-response structures stress regime

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Tensile Fractures and in situ stress Measurement Data Constraints on Cretaceous-Present tectonic stress field Evolution of the Tanlu Fault Zone in Shandong Province,North China Craton

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Acta Geologica Sinica(English Edition) 2023年第6期97卷 1616-1624页

作者： YANG Chengwei WANG Chenghu National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China

tectonic stress fields are the key drivers of tectonic events and the evolution of regional *** tectonic stress field evolution of the Tanlu fault zone in Shandong Province,located in the east of the North China Craton(NCC),may have preserved records of the NCC’s tectonic *** television survey and hydraulic fracturing were conducted to analyze the paleo and present tectonic stress *** groups of tensile fractures were identified via borehole television,their azimuths being NNW-SSE,NW-SE and NE-SW,representing multiple stages of tectonic *** fracturing data indicates that the study region is experiencing NEE-SWW-oriented compression and nearly-N-Soriented extension,in accordance with strike-slip and *** the Cretaceous,the orientation of the extensional stress has evolved counterclockwise and sequentially from nearly-NW-SE-oriented to NE-SW-oriented and even nearly N-S-oriented,the stress state having transitioned from strike-slip-extension to strike-slip-compression,in association with the rotating and oblique subduction of the Pacific Plate beneath the NCC,with the participation of the Indian Plate.

关键词： borehole television tectonic stress field hydraulic fracturing Tanlu fault zone North China Craton

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Acoustic emission-based numerical simulation of tectonic stress field for tectoclase prediction in shale reservoirs of the northern Guizhou area, China

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Energy Geoscience 2022年第4期3卷 436-443页

作者： Zhonghu Wu Motian Tang Yujun Zuo Yili Lou Wentao Wang Hao Liu Wenjibin Sun College of Civil Engineering Guizhou UniversityGuiyangGuizhou550025China School of Qilu Transportation Shandong UniversityJinanShandong250002China Geotechnical and Structural Engineering Research Center Shandong UniversityJinanShandong250061China Mining College Guizhou UniversityGuiyangGuizhou550025China

Natural fractures,like tectoclases,are essential in the formation of shale gas reservoirs and have been the focus of study for shale gas *** provide most storage space for gas and are largely controlled by the paleo-tectonic stress field in shale reservoirs of the Niutitang Formation,northern Guizhou area,*** accurate prediction of the development and distribution of tectoclases in the reservoirs is of great significance to exploring and developing shale gas sweet spots in the *** on geological structure evolution and fracture characterization,this study is focused on factors that control the fracture development in the Niutitang Formation shale reservoirs in northern Guizhou through characterization and modeling of geomechanisms and tectonic movements.A geomechanical model is formulated for the shale reservoirs against the geological background of the *** this basis,the fractures are predicted by using the acoustic emission *** simulation results show that the development and distribution of tectoclase is controlled by fault zones,some of which have no obvious turning points with tectoclase in the middle sections being more developed and fragmented than those at the two *** of these have obvious S-shaped turning points where tectoclases are the most developed and fragmented.

关键词： Shale reservoir tectonic stress field Numerical simulation Tectoclase Acoustic emission

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The seismicity and tectonic stress field characteristics of the Longmenshan fault zone before the Wenchuan M_S8.0 earthquake

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Earthquake Science 2009年第2期22卷 119-128页

作者： Zhiwei Zhang Wanzheng Cheng Xiang Ruan Peng Wu Lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China Earthquake Administration of Sichuan Province Chengdu 610041 China

The seismicity of Longrnenshan fault zone and its vicinities before the 12 May 2008 Wenchuan Ms8.0 earthquake is studied. Based on the digital seismic waveform data observed from regional seismic networks and mobile stations, the focal mechanism solutions are determined. Our analysis results show that the seismicities of Longmenshan fault zone before the 12 May 2008 Wenchuan earthquake were in stable state. No obvious phenomena of seismic activity intensifying appeared. According to focal mechanism solutions of some small earthquakes before the 12 May 2008 Wenchuan earthquake, the direction of principal compressive stress P-axis is WNW-ESE. The two hypocenter fault planes are NE-striking and NW-striking. The plane of NE direction is among N50°-70°E, the dip angles of fault planes are 60°-70° and it is very steep. The faultings of most earthquakes are dominantly characterized by dip-slip reverse and small part of faultings present strike-slip. The azimuths of principal compressive stress, the strikes of source fault planes and the dislocation types calculated from some small earthquakes before the 12 May 2008 Wenchuan earthquake are in accordance with that of the main shock. The average stress field of micro-rupture along the Longmenshan fault zone before the great earthquake is also consistent with that calculated from main shock. Zipingpu dam is located in the east side 20 km from the initial rupture area of the 12 May 2008 Wenchuan earthquake. The activity increment of small earthquakes in the Zipingpu dam is in the period of water discharging. The source parameter results of the small earthquakes which occurred near the initial rupture area of the 12 May 2008 Wenchuan earthquake indicate that the focal depths are 5 to 14 km and the source parameters are identical with that of earthquake.

关键词： Wenchuan earthquake Longmenshan fault zone focal mechanism solution tectonic stress field

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Numerical calculations of tectonic stress field of Chinese mainland and its neighboring regions and their applications to explanation of seismic activity

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Acta Seismologica Sinica(English Edition) 1999年第2期12卷 137-147页

作者：焦明若张国民车时刘杰 Center for Analysis and Prediction China Seismological Bureau Beijing China

This paper made a numerical simulation to the basic tectonic stress field of Chinese mainland and its neighboringregion using the visco-elasticity finite element model and the new published displacement rate result. Main contents include the simulation of maximum shear stress and its varying rate, the maximum shear strain and its varyingrate, the shear strain energy density and its varying rate. In view of the high inhomogeneous distribution characterof seismicity in space and time in Chinese mainland and its neighboring area, the normalized background energyvalue was given by means of normalized treatment to the earthquake energy release in the eastern and westernparts of Chinese mainland. And the comparison of the simulation result with the actual seismicity was made. Thefesults show that the simulation values can explain well the earthquake distribution character of Chinese mainlandand its neighboring area.

关键词： tectonic stress field numerical simulation seismic activity Chinese mainland

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Three dimensional tectonic stress field in North China

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Acta Seismologica Sinica(English Edition) 1999年第2期12卷 155-164页

作者：陈连旺陆远忠张杰许桂林郭若眉 Institute of Crustal Dynamics China Seismological Bureau Beijing China

According to the latest data of geological structure, geophysics, in-situ stress measurement and focal mechanism,3-D tectonic stress field model in North China is built and 3-D tectonic stress field pattern of North China aresimulated by finite element method. Then the overall characteristics and regional specific feature of North Chinaare studied. Finally, the influences of the valid dynamic boundary conditions of North China Block, active faultsand the inhomogeneity of crustal medium on tectonic stress field of North China are investigated.

关键词： North China tectonic stress field three dimensional pattern numerical simulation by finite element method

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Evolution characteristics of Quaternary tectonic stress field in the north and east margin of Qinghai-Xizang plateau

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Acta Seismologica Sinica(English Edition) 1999年第5期12卷 550-561页

作者：谢富仁张世民窦素芹崔效锋舒塞兵 Institute of Crustal Dynamics China Seismological Bureau Beijing China

By inversion of fault slip data for Quaternary tectonic stress field and the analysis of crustal deformation after lateTeriary. we explaincd the evolution of crustal dynamic about the north and east margin of Qinghai-Xizang (Tibet)plateau since Miocenc. From middle or late Miocene to early Pleistocene, the tectonic stress field was featured by amaximum principal compression which was coming from the collision of india Plate continued to the boundaryof the plateau. and was basically of reverse faulting type. Since the late period of early Pleistocene, Pleistocene continuedto push northward and the compressional deformation of the plateau interior increased continuously, meanwhile,N W-SE extension appeared on the east side of the plateau. This formed a favorable condition for the interior block offoe plateau to slide towards east and southeast, causing the faults surrounding the plateau to change from thrust tostrike-slip. -The contemporary tectonic stress field was formed from the late period of early Pleistocene and continuedto present. The direction of maximum principal compressional stress rotated clockwise with respect to the previoustectonic stress held. the stress field was mainly of strike-slip type.

关键词： Qinghai-Xizang plateau tectonic stress field crustal deformation

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The　characteristics　of　tectonic　stress　field　about　strike　slip　earthquake－generating　structure　in　the　Chinese　mainland

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Acta Seismologica Sinica(English Edition) 1994年第4期7卷 567-575页

作者：环文林汪素云宋昭仪 Institute of Geophysics State Seismological Bureau Beijing China

This paper is one of the series papers about the study on strike-slip earthquake-generating structure in the Chinese mainland. In the first part of this paper, based on the large amount of data from large earthquake investigation and the latest results of focal mechanism, the earthquake-generating structure in the Chinese mainland interior and its neighbouring region is discussed. It is concluded that the absolutely predominated earthquake, not only in number, but also in intensity, as well as in distributing area, is strike slip earthquake, and it is further stressed that the study on the strike slip earthquake-generating structure is significant for seismic risk analysis. In the second part, the characteristics of tectonic stress field about strike slip earthquake-generating structure and the compiled distribution outline of strike slip earthquake-generating fault, normal fault, and thrust fault in the Chinese mainland interior and its neighbouring region, in the light of stress characteristics of fault plane solutions, are also discussed.

关键词： earthquake generating structure tectonic stress field strike slip earthquake

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