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Application of geophysical well logs in solving geologic issues:Past,present and future prospect

Geoscience Frontiers 2024年第3期15卷 85-118页

作者： Jin Lai Yang Su Lu Xiao Fei Zhao Tianyu Bai Yuhang Li Hongbin Li Yuyue Huang Guiwen Wang Ziqiang Qin National Key Laboratory of petroleum Resources and engineering China University of Petroleum(Beijing)Beijing 102249China College of geosciences China University of Petroleum(Beijing)Beijing 102249China department of petroleum engineering University of WyomingLaramieWY 82071USA

Geophysical well logs are widely used in geological fields,however,there are considerable incompatibilities existing in solving geological issues using well log *** review critically fills the gaps between geology and geophysical well logs,as assessed from peer reviewed papers and from the authors’personal experiences,in the particular goal of solving geological issues using geophysical well *** origin and history of geophysical logging are *** follows a review of the state of knowledge for geophysical well logs in terms of type of specifications,vertical resolution,depth of investigations and demonstrated *** the current status and advances in applications of geophysical well logs in fields of structural geology,sedimentary geology and petroleum geology are *** logs are used in structural and sedimentary geology in terms of structure detection,in situ stress evaluation,sedimentary characterization,sequence stratigraphy division and fracture *** logs can also be applied in petroleum geology fields of optimizing sweet spots for hydraulic fracturing in unconventional oil and gas *** well logs are extending their application in other fields of geosciences,and geological issues will be efficiently solved via well logs with the improvements of advanced well log *** work is required in order to improve accuracy and diminish uncertainties by introducing artificial *** review provides a systematic and clear descriptions of the applications of geophysical well log data along with examples of how the data is displayed and processed for solving geologic problems.

关键词： Geophysical well logs Sequence stratigraphy Source rock Unconventional oil and gas resources Artificial intelligence

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Sand control mechanism of radial well filled with phase change material in hydrate reservoir

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petroleum Science 2024年第4期21卷 2571-2582页

作者： Xiao-Qiang Liu Zhong-Xi Han Zhi-Lin Luo Hai-Long Lu Ying Sun Qing You Tian-Kui Guo Zhan-Qing Qu School of Energy Resources China University of Geosciences (Beijing) Beijing Key Laboratory of Unconventional Natural Gas geological Evaluation and Development engineering China University of Geosciences (Beijing) China Research Institute of petroleum Exploration and Development engineering Technology Research Institute of Southwest Oil & Gas Field Company PetroChina Beijing International Center for Gas Hydrate School of Earth and Space Sciences Peking University School of Advanced Material Peking University Shenzhen Graduate School School of petroleum engineering China University of Petroleum (East China)

Radial well filled with phase change material has been proposed as a novel sand control method for hydrate exploitation. In order to reveal the sand control mechanism, CFD-DEM coupling method is applied to simulate the migration, settlement, and blockage processes of sand particles in the radial *** obtained results indicate that three scenarios have been recognized for sand particles passing through sand control medium, based on the diameter ratio of sand control medium to sand particle（Dd）:fully passing（Dd= 8.75-22.5）, partially passing and partially blocked（Dd= 3.18-5.63）, and completely blocked（Dd= 2.18-3.21）. After being captured by the sand control medium, sand particles can block pores, which increases fluid flow resistance and causes a certain pressure difference in the radial *** pressure in the radial well should be lower than the hydrate phase equilibrium pressure during sand control design, for the purpose of promoting hydrate decomposition, and sand capture. The length of the radial well should be optimized based on the reservoir pore pressure, production pressure difference,bottom hole pressure, and the pressure gradient in the radial well. It should be noticed that the sand control medium leads to a decrease in permeability after sand particles captured. Even the permeability is reduced to several hundred millidarcy, it is still sufficient to ensure the effective flow of gas and water after hydrate decomposition. Increasing fluid velocity reduces the blocking capacity of the sand control medium, mainly because of deterioration in bridging between sand particles.

关键词： Hydrate reservoir Sand control Radial well CFD-DEM

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Weight Analysis of Impact Factors of Interbedded Anti-Inclined Slopes Block-Flexure Toppling Based on Support Vector Regression

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Journal of Earth Science 2024年第2期35卷 568-582页

作者： Bocheng Zhang Huiming Tang Yibing Ning Kun Fang Ding Xia department of engineering Geology and Geotechnical engineering Faculty of EngineeringChina University of GeosciencesWuhan430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan430074China College of geological engineering and Geomatics Chang’an UniversityXi’an710054China

Block-flexure toppling failure is frequently encountered in interbedded anti-inclined rock(IAR)slopes,and seriously threatens the construction of hydropower *** this study,we first investigated the Lean Reservoir area’s geological setting and the Linda landslide’s ***,uniform design and random design were used to design 110 training datasets and 31 testing datasets,***,the toppling response was obtained by using the discrete element ***,support vector regression was used to obtain the influence weights of 21 impact *** results show that the influence weight of the slope angle and rock formation dip angle on the toppling deformation among tertiary impact factors is 25.96%and 17.28%,respectively,which are much greater than the other 19 impact factors within the research *** the primary impact factors,the influence weight is sorted from large to small as slope geometry parameters,joints parameters,and rock mechanics *** parameters,especially the geometric parameters,cannot be ignored when evaluating the stability of IAR *** numerical simulation,it was qualitatively determined that failure surfaces of slopes were controlled by cross joints and that the rocks in the slope toe play a role in preventing slope deformation.

关键词： interbedded anti-inclined slopes block-flexure toppling impact factors numerical simulation support vector regression engineering geology

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An efficient data-driven global sensitivity analysis method of shale gas production through convolutional neural network

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petroleum Science 2024年第4期21卷 2475-2484页

作者： Liang Xue Shuai Xu Jie Nie Ji Qin Jiang-Xia Han Yue-Tian Liu Qin-Zhuo Liao State Key Laboratory of petroleum Resources and engineering China University of Petroleum (Beijing) department of Oil-Gas Field Development engineering College of Petroleum Engineering China University of Petroleum (Beijing) Chuanqing Drilling engineering Co.Ltd. China National Petroleum Corporation

The shale gas development process is complex in terms of its flow mechanisms and the accuracy of the production forecasting is influenced by geological parameters and engineering parameters. Therefore, to quantitatively evaluate the relative importance of model parameters on the production forecasting performance, sensitivity analysis of parameters is required. The parameters are ranked according to the sensitivity coefficients for the subsequent optimization scheme design. A data-driven global sensitivity analysis(GSA) method using convolutional neural networks(CNN) is proposed to identify the influencing parameters in shale gas production. The CNN is trained on a large dataset, validated against numerical simulations, and utilized as a surrogate model for efficient sensitivity analysis. Our approach integrates CNN with the Sobol' global sensitivity analysis method, presenting three key scenarios for sensitivity analysis: analysis of the production stage as a whole, analysis by fixed time intervals, and analysis by declining rate. The findings underscore the predominant influence of reservoir thickness and well length on shale gas production. Furthermore, the temporal sensitivity analysis reveals the dynamic shifts in parameter importance across the distinct production stages.

关键词： Shale gas Global sensitivity Convolutional neural network Data-driven

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Role of high-density brines in reservoir development stages:A review

Energy Geoscience

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Energy Geoscience 2024年第3期5卷 13-23页

作者： Arshad Raza Mohamed Mahmoud Saad Alafnan Muhammad Arif Farzain Ud Din Kirmani Muhammad Shahzad Kamal Mobeen Murtaza Azeem Rana College of petroleum engineering and geosciences(CPG) Petroleum Engineering DepartmentKing Fahd University of Petroleum&Minerals(KFUPM)DhahranSaudi Arabia petroleum engineering department Khalifa UniversityAbu Dhabi127788United Arab Emirates department of petroleum and Gas engineering N.F.C.Institute of Engineering&TechnologyMultanPakistan Center for Integrative petroleum Research King Fahd University of Petroleum&Minerals31261DhahranSaudi Arabia department of Chemistry University of Management and TechnologyLahorePakistan

High-density brines have been recognized beneficial for oilfield applications,with various key areas such as drilling,completion and formation ***-density brines can play a critical role in the development and production of oil and gas reservoirs during the primary,secondary,and tertiary recovery ***-density brines can enhance the mobility and recovery of the oil in the reservoir by controlling the density and ***,a less attention has been given to the application of high-density brine in the area of reservoir *** review is shedding light on a concise overview of reservoir development stages in association with the recovery *** addition,most possible applications of high-density fluids have also been reviewed in the field of the reservoir *** summary,this review state that high-density brines can be used to stimulate reservoirs by hydraulic fracturing during the primary recovery ***,the risk of increased interfacial tension,which relies on the density difference of two fluids,can trap more residual oil relative to conventional water *** addition,high-density brines are effective in decreasing the mobility ratio and facilitating favorable displacement during polymer ***,they can be least effective in alkaline flooding due to the high IFT related to large density ***,it is suggested to consider the utilization of sustainable high-density brines by taking into account effective factors in petroleum engineering aspects such as stimulation,secondary recovery and polymer flooding.

关键词： Reservoir development Brine High density Environment Sustainability

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Partitioning Anatolian Kinematics into Tectonic Escape and Slab Rollback Dominated Domains

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Journal of Earth Science 2024年第3期35卷 758-768页

作者： Jiannan Meng Timothy M.Kusky Erdin Bozkurt Hao Deng Ozan Sinoplu State Key Laboratory of geological Processes and Mineral Resources Center for Global TectonicsSchool of Earth SciencesChina University of GeosciencesWuhan 430074China Badong National Observatory and Research Station for Geohazards China University of GeosciencesWuhan 430074China department of geological engineering Middle East Technical University06800 AnkaraTurkey department of geosciences Auburn UniversityAuburn AL 36849USA

Anatolia is the global archetype of tectonic escape,as witnessed by the devastating 2023 Kahramanmaraş Earthquake sequence,and the 2020 Samos Earthquake,which show different kinematics related to the framework of the escape *** Positioning System(GPS)motions of the wedge-shaped plate differ regionally from northwestwards to southwestwards(from east to west).Anatolia was extruded westward from the Arabian-Eurasian collision along the North and East Anatolian fault systems,rotating counterclockwise into the oceanic free-faces of the Mediterranean and Aegean,with dramatic extension of western Anatolia in traditional ***,which is the dominant mechanism for this change in kinematics,extrusion related to the Arabia/Eurasia collision or rollback of the African slab beneath western Anatolia is still *** assess the dominant driving mechanisms across Anatolia,we analyze recent GPS velocity datasets,and decomposed them into N-S and E-W components,revealing that westward motion is essentially constant across the whole plate and consistent with the slip rates of the North and East Anatolia fault zones,while southward components increase dramatically in the transition area between central and western Anatolia,where a slab tear is *** phenomenon is related to different tectonic driving *** ArabiaEurasia collision drives the Anatolian Plate uniformly westwards while western Anatolia is progressively more affected by the southward retreating African subducting slab west of the Aegean/Cypriot slab tear,which significantly increases the southward component of the velocity field and causes the apparent curve of the whole modern velocity *** 2020 and 2023 earthquake focal mechanisms also confirm that the northward colliding Arabian Plate forced Anatolia to the west,and the retreating African slab is pulling the upper plate of western Anatolian apart in *** propose that the Anatolian Plate is moving westwards as

关键词： tectonics neotectonics tectonic escape slab rollback Anatolian Plate GPS velocity field geodynamics.

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Evaluating reservoir suitability for large-scale hydrogen storage:A preliminary assessment considering reservoir properties

Energy Geoscience

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Energy Geoscience 2024年第4期5卷 198-211页

作者： Chinedu J.Okere James J.Sheng Chinedu Ejike Bob L.Herd department of petroleum engineering Texas Tech UniversityLubbockTX79409United States Mewbourne School of petroleum and geological engineering University of OklahomaOK73019United States

With rising demand for clean energy,global focus turns to finding ideal sites for large-scale underground hydrogen storage(UHS)in depleted petroleum reservoirs.A thorough preliminary reservoir evaluation before hydrogen(H_(2))injection is crucial for UHS success and *** criteria for UHS often emphasize economics and chemistry,neglecting key reservoir *** study introduces a comprehensive framework for the reservoir-scale preliminary assessment,specifically tailored for long-term H_(2) storage within depleted gas *** evaluation criteria encompass critical components,including reservoir geometry,petrophysical properties,tectonics,and formation *** illustrate the practical application of this approach,we assess the Barnett shale play reservoir *** assessment unfolds through three key stages:(1)A systematic evaluation of the reservoir's properties against our comprehensive screening criteria determines its suitability for H_(2) storage.(2)Using both homogeneous and multilayered gas reservoir models,we explore the feasibility and efficiency of H_(2) *** phase involves an in-depth examination of reservoir behavior during the injection stage.(3)To enhance understanding of UHS performance,sensitivity analyses investigate the impact of varying reservoir dimensions and injection/production *** findings reveal the following:(a)Despite potential challenges associated with reservoir compaction and aquifer support,the reservoir exhibits substantial promise as an H_(2) storage site.(b)Notably,a pronounced increase in reservoir pressure manifests during the injection stage,particularly in homogeneous reservoirs.(c)Furthermore,optimizing injection-extraction cycle efficiency can be achieved by augmenting reservoir dimensions while maintaining a consistent *** ensure a smooth transition to implementation,further comprehensive investigations are advised,including experimental and numerical studies to address

关键词： Site selection Underground hydrogen storage Preliminary evaluation Depleted petroleum reservoirs Reservoir assessment

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Pore-scale water-gas distribution and gas permeability of natural gas hydrate reservoirs in the South China Sea

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Geoscience Frontiers 2024年第4期15卷 315-329页

作者： Yuxuan Xia Derek Elsworth Jianchao Cai Cheng Lu Chao Ma National Key Laboratory of petroleum Resources and engineering China University of PetroleumBeijing 102249China department of Energy and Mineral engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity Park 16802PAUnited States Guangzhou Marine geological Survey China Geological SurveyGuangzhou 510075China Center of Oil&Natural Gas Resource Exploration China Geological SurveyBeijing 100083China

Challenges in water drainage within natural gas hydrate reservoirs in the Shenhu area of the South China Sea,characterized by high clay content and strong hydrophilicity,significantly hinder natural gas *** the effects of gas pressure and liquid/gas saturation on gas permeability reveals essential insights for increasing gas production *** report gas displacement experiments on clayey-silt sediment samples,alongside X-ray computed tomography imaging,that reveal critical findings:a notable increase in flow rate and permeability as displacement pressure nears compaction pressure,highlighting the role of pressure management in enhancing recovery;water displacement from varying pore sizes under different pressures,highlighting the influence of pore size on fluid dynamics,and structural changes,including microfracture formation and a significant fracture that enlarges total pore space by about 15%,which collectively suggest methods to improve gas flow and ***,our analysis identifies average throat length,fractal dimension,and succolarity as principal controls on gas permeability,indicating the substantial impact of microstructural properties on extraction *** outcomes offer valuable strategies for optimizing natural gas hydrate reservoir development in the South China Sea,emphasizing the need for meticulous pressure and saturation control and in applying a deep understanding of microstructural dynamics.

关键词： Natural gas hydrate Clayey-silt sediments Gas saturation Gas permeability Microstructure

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An application of a genetic algorithm in co-optimization of geological CO_(2)storage based on artificial neural networks

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Clean Energy 2024年第1期8卷 111-125页

作者： Pouya Vaziri Behnam Sedaee Institute of petroleum engineering Chemical Engineering DepartmentCollege of EngineeringUniversity of TehranTehranIran

Global warming,driven by human-induced disruptions to the natural carbon dioxide(CO_(2))cycle,is a pressing *** mitigate this,carbon capture and storage has emerged as a key strategy that enables the continued use of fossil fuels while transitioning to cleaner energy *** saline aquifers are of particular interest due to their substantial CO_(2)storage potential,often located near fossil fuel *** this study,a deep saline aquifer model with a saline water production well was constructed to develop the optimization *** to the time-consuming nature of each realization of the numerical simulation,we introduce a sur-rogate aquifer model derived from extracted *** novelty of our work lies in the pioneering of simultaneous optimization using machine learning within an integrated *** previous studies,which typically focused on single-parameter optimiza-tion,our research addresses this gap by performing multi-objective optimization for CO_(2)storage and breakthrough time in deep sa-line aquifers using a data-driven *** methodology encompasses preprocessing and feature selection,identifying eight pivotal *** metrics include root mean square error(RMSE),mean absolute percentage error(MAPE)and R^(2).In predicting CO_(2)storage values,RMSE,MAPE and R^(2)in test data were 2.07%,1.52%and 0.99,respectively,while in blind data,they were 2.5%,2.05%and *** the CO_(2)breakthrough time,RMSE,MAPE and R^(2)in the test data were 2.1%,1.77%and 0.93,while in the blind data they were 2.8%,2.23%and 0.92,*** addressing the substantial computational demands and time-consuming nature of coup-ling a numerical simulator with an optimization algorithm,we have adopted a strategy in which the trained artificial neural network is seamlessly integrated with a multi-objective genetic *** this framework,we conducted 5000 comprehensive experi-ments to rigorously validate the development of the Pareto f

关键词： carbon capture and storage deep saline aquifer artificial neural network multi-objective optimization genetic algorithm breakthrough time geological storage

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Effect of thermal maturation and organic matter content on oil shale fracturing

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International Journal of Coal Science & Technology 2024年第2期11卷 16-34页

作者： Fatemeh Saberi Mahboubeh Hosseini‑Barzi department of Geology and geological engineering University of North Dakota264 Centennial DriveGrand ForksNDUSA department of Geology and petroleum Basins Shahid Beheshti University of TehranTehranTehran ProvinceIran

The Pabdeh Formation represents organic matter enrichment in some oil fields,which can be considered a source *** study is based on the Rock–Eval,Iatroscan,and electron microscopy imaging results before and after heating the *** discovered this immature shale that undergoes burial and diagenesis,in which organic matter is converted into *** migration is the process that transports hydrocarbons in the source *** investigated this phenomenon by developing a model that simulates hydrocarbon generation and fluid pressure during kerogen-to-hydrocarbon *** initially formed at the tip/edge of kerogen and were filled with hydrocarbons,but as catagenesis progressed,the pressure caused by the volume increase of kerogen decreased due to hydrocarbon *** transformation of solid kerogen into low-density bitumen/oil increased the pressure,leading to the development of damage zones in the source *** Pabdeh Formation’s small porethroats hindered effective expulsion,causing an increase in pore fluid pressure inside the initial *** stress accumulated due to hydrocarbon production,reaching the rock’s fracture strength,further contributed to damage zone *** the expansion process,microfractures preferentially grew in low-strength pathways such as lithology changes,laminae boundaries,and pre-existing *** the porous pressure created by each kerogen overlapped,individual microfractures interconnected,forming a network of microfractures within the source *** research sheds light on the complex interplay between temperature,hydrocarbon generation,and the development of expulsion fractures in the Pabdeh Formation,providing valuable insights for understanding and optimizing hydrocarbon extraction in similar geological settings.

关键词： Oil shale Microfracture Hydrocarbon generation Organic matter Thermal maturation Primary migration

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