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fracture prediction in non-isothermal viscous pressure bulging of aluminum alloy sheet using ductile fracture criterion

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Journal of Central South University 2010年第3期17卷 449-453页

作者：王忠金刘建光李毅 School of Materials Science and Engineering Harb in Institute of Technology

The failure of AA3003 aluminum alloy sheet metal was predicted for non-isothermal viscous pressure bulging (VPB). Utilizing the coupled thermo-mechanical finite element method combined with ductile fracture criterion, the calculations were carried out for non-isotherm VPB at various temperatures and the influences of the initial temperature of viscous medium on failure mode of bulge specimens were investigated. The results show that the failure modes are different for the non-isothermal VPB with different initial temperatures of viscous medium. For the non-isothermal VPB of AA3003 aluminum alloy sheet with initial temperature of 250 ℃, when the initial temperature of viscous medium ranges from 150 to 180 ℃, the formability of sheet metal can be improved to a full extent. The validity of the predictions is examined by comparing with experimental results.

关键词： fracture prediction non-isothermal viscous pressure bulging aluminum alloy sheet finite element method

Forward modeling of fracture prediction based on seismic attribute modeling

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Earthquake Research Advances 2021年第S1期1卷 57-58页

作者： Rubing Deng Qi Chen Chengdu University of Technology ChengduChina

fractured reservoirs have always been a big favorable area for oil and gas reservoirs,so prediction of fractures is also a research hotspot in recent *** to the diversity of fracture development and the unclear development mechanism,fracture prediction has always been a major *** numerical simulation In this paper,seismic attribute is combined with numerical simulation,logging data and actual seismic profile are used as constraints,inversion impedance value and coherent attribute are combined,and finally a property model more in line with the actual geological conditions is *** wave equation calculation and migration processing were used to obtain the numerical simulation profile,and the actual seismic profile,fracture detection profile and numerical simulation profile were combined for analysis:①The numerical simulation section under this modeling method can greatly correspond to the actual seismic section,and the reflected results can better reflect the changes of response characteristics.②The reliability and applicability of the fracture detection technology can be determined by comparing the forward simulation profile with the fracture detection profile.

关键词： fracture prediction seismic attribute modeling

Seismic identification and characterization of complex storage space oil and gas reservoirs

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Applied Geophysics 2024年第3期21卷 606-615,620页

作者： XiaoYu-Jiang Tao Song Li Deng-Gan Xiao Yue-Zhou Jing Liang Lele-Wei Ming Zhang Xiaofeng-Dai Research Institute of Petroleum Exploration&Development Beijing100083China

To predict complex reservoir spaces(with developed caves,pores,and fractures),based on the results of full-azimuth depth migration processing,we adopted reverse weighted nonlinear inversion to improve the accuracy of porous reservoir *** imaging three-parameter wavelet transform technology was used to accurately predict small-scale cave *** joint inversion method of velocity and amplitude anisotropy was developed to improve the accuracy of small and medium-sized fracture *** results of multiscale fracture modeling and characterization,interwell connectivity analysis,and connection path prediction are consistent with the production ***,based on the above prediction findings,favorable reservoir development areas were *** above ideas and strategies have great application value for the efficient exploration and development of complex storage space reservoirs and the optimization of high-yield well locations.

关键词： complex storage space fracture prediction reservoir prediction cave prediction

Quantitative prediction of fracture Distribution of the Longmaxi Formation in the Dingshan Area, China using FEM Numerical Simulation

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1662-1672页

作者： XIE Jiatong QIN Qirong FAN Cunhui State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Collaborative Innovation Center of shale gas resources and environment Southwest Petroleum UniversityChengdu 610500China

fracture prediction is a technical issue in the field of petroleum exploration and production *** there are many approaches to predict the distribution of cracks underground,these approaches have some *** resolve these issues,we ascertained the relation between numerical simulations of tectonic stress and the predicted distribution of fractures from the perspective of geologic genesis,based on the characteristics of the shale reservoir in the Longmaxi Formation in Dingshan;the features of fracture development in this reservoir were considered.3 D finite element method(FEM)was applied in combination with rock mechanical parameters derived from the acoustic *** paleotectonic stress field of the crack formation period was simulated for the Longmaxi Formation in the Dingshan *** splitting factor in the study area was calculated based on the rock breaking *** coefficient of fracture development was selected as the quantitative prediction classification criteria for the *** results show that a higher coefficient of fracture development indicates a greater degree of fracture *** the basis of the fracture development coefficient classification,a favorable area was identified for the development of fracture prediction in the study *** prediction results indicate that the south of the Dingshan area and the DY3 well of the central region are favorable zones for fracture development.

关键词： FEM numerical simulation structural stress field fracture prediction Longmaxi Formation

The application study on the multi-scales integrated prediction method to fractured reservoir description

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Applied Geophysics 2016年第1期13卷 80-92,219页

作者：陈双全曾联波黄平孙绍寒张琬璐李向阳中国石油大学(北京)油气资源与探测国家重点实验室北京102249 中国石油大学(北京)CNPC物探重点实验室北京102249 中国石油西南油气田研究院成都641500 中石油东方地球物理公司研发中心涿州072751 英国联邦地质调查局爱丁堡EH9 3AZ

In this paper,we implement three scales of fracture integrated prediction study by classifying it to macro-（ 1/4/λ）,meso-（ 1/100λ and 1/4λ） and micro-（ 1/100λ） *** on the multi-scales rock physics modelling technique,the seismic azimuthal anisotropy characteristic is analyzed for distinguishing the fractures of ***,by integrating geological core fracture description,image well-logging fracture interpretation,seismic attributes macro-scale fracture prediction and core slice micro-scale fracture characterization,an comprehensive multi-scale fracture prediction methodology and technique workflow are proposed by using geology,well-logging and seismic ***,utilizing the geology core slice observation（fractures description） and image well-logging data interpretation results,the main governing factors of fracture development are obtained,and then the control factors of the development of regional macro-scale fractures are carried out via modelling of the tectonic stress *** the meso-scale fracture description,the poststack geometric attributes are used to describe the macro-scale fracture as well,the prestack attenuation seismic attribute is used to predict the meso-scale ***,by combining lithological statistic inversion with superposed results of faults,the relationship of the meso-scale fractures,lithology and faults can be reasonably interpreted and the cause of meso-scale fractures can be *** micro-scale fracture description is mainly implemented by using the electron microscope scanning of ***,the development of fractures in reservoirs is assessed by valuating three classes of fracture prediction *** integrated fracture prediction application to a real field in Sichuan basin,where limestone reservoir fractures developed,is *** application results in the study area indicates that the proposed multi-scales integrated fracture prediction method and the technique pr

关键词： Multi-scales fracture prediction Heterogeneity Reservoir characterization Sweet-spots prediction

Predicting gas-bearing distribution using DNN based on multi-component seismic data: Quality evaluation using structural and fracture factors

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Petroleum Science 2022年第4期19卷 1566-1581页

作者： Kai Zhang Nian-Tian Lin Jiu-Qiang Yang Zhi-Wei Jin Gui-Hua Li Ren-Wei Ding College of Earth Sciences and Engineering Shandong University of Science and TechnologyQingdaoShandong266590China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong266237China

The tight-fractured gas reservoir of the Upper Triassic Xujiahe Formation in the Western Sichuan Depression has low porosity and permeability. This study presents a DNN-based method for identifying gas-bearing strata in tight sandstone. First, multi-component composite seismic attributes are *** strong nonlinear relationships between multi-component composite attributes and gas-bearing reservoirs can be constrained through a DNN. Therefore, we identify and predict the gas-bearing strata using a DNN. Then, sample data are fed into the DNN for training and testing. After optimized network parameters are determined by the performance curves and empirical formulas, the best deep learning gas-bearing prediction model is determined. The composite seismic attributes can then be fed into the model to extrapolate the hydrocarbon-bearing characteristics from known drilling areas to the entire region for predicting the gas reservoir distribution. Finally, we assess the proposed method in terms of the structure and fracture characteristics and predict favorable exploration areas for identifying gas reservoirs.

关键词： Multi-component seismic exploration Tight sandstone gas reservoir prediction Deep neural network(DNN) Reservoir quality evaluation fracture prediction Structural characteristics

Study of the relationship between fractures and highly productive shale gas zones, Longmaxi Formation, Jiaoshiba area in eastern Sichuan

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Petroleum Science 2018年第3期15卷 498-509页

作者： Yu-Feng Li Wei Sun Xi-Wu Liu Dian-Wei Zhang Yan-Chun Wang Zhi-Yuan Liu School of Geophysics and Information Technology China University of Geoscience Research Institute of Petroleum Exploration and Development Sinopec

Shale fractures are an important factor controlling shale gas enrichment and high-productivity zones in the Longmaxi Formation, Jiaoshiba area in eastern Sichuan. Drilling results have, however, shown that the shale fracture density does not have a straightforward correlation with shale gas productivity. Based on logging data, drilling and seismic data, the relationship between shale fracture and shale gas accumulation is investigated by integrating the results of experiments and geophysical methods. The following conclusions have been drawn：（1） Tracer diffusion tests indicate that zones of fracture act as favorable channels for shale gas migration and high-angle fractures promote gas accumulation.（2） Based on the result of azimuthal anisotropy prediction, a fracture system with anisotropy strength values between 1 and 1.15 represents a moderate development of high-angle fractures, which is considered to be favorable for shale gas accumulation and high productivity, while fracture systems with anisotropy strength values larger than 1.15 indicate over-development of shale fracture, which may result in the destruction of the shale reservoir preservation conditions.

关键词： Azimuthal anisotropy fracture prediction Shale Shale gas Shale reservoir preservation conditions