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Paleoenvironment evolution and organic matter enrichment mechanisms in the first member of the Qingshankou Formation,Songliao Basin,China

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Frontiers of Earth Science 2024年第2期18卷 364-383页

作者： Ying LI Min WANG Yu YAN Xin WANG Jinyou ZHANG Xuefeng BAI Yuchen ZHANG Jiaheng XUE Junsheng FEI Lianbin ZHANG Guojun WANG School of Geoscience China University of Petroleum(East China)Qingdao 266580China Shandong Provincial Key Laboratory of Deep Oil and Gas Qingdao 266580China exploration and development research institute of Daqing Oilfield Co Ltd. Daqing 163712China exploration Division PetroChina Daqing Oilfield CompanyDaqing 163453China Department of Physics Xiamen University MalaysiaBandar Sunsuria 43900Malaysia

Organic matter is the basis for oil and gas generation,and the depositional environment controls its *** first member of the Qingshankou Formation(K_(2)qn^(1))in Songliao Basin has a thick organic-rich shale and so is an important target section for shale oil exploration and *** the Gulong Sag,shale samples from this unit were collected over the full length of the *** characterization of the environments of deposition(EOD)of K_(2)qn^(1)was improved by utilizing lithological characteristics,thin section observations,elemental compositions,and organic carbon *** with the normalization coefficients proposed in this paper,an organic matter correlation model was established to elucidate the factors that influence organic matter *** the bottom to the top of K2qn1,the lake depth gradually becomes shallower,the primary productivity first decreases and then increases,the reducing conditions become stronger and then weaker,the water salinity gradually decreases,the climate first becomes semi-humid and then warm and humid,and the input of terrigenous debris first decreases and then increases.A major marine transgression at the base of the K_(2)qn^(1)᾽s brought in nutrients to increase primary productivity,and the density-stratified reducing environment preserved and enriched organic *** primary productivity occurred during the middle of the deposition of the K_(2)qn^(1),while terrigenous input is *** matter is preserved in reduced deep lake environments,resulting in organic matter-rich black *** lake became shallower,and the salinity decreased in the upper part of K_(2)qn^(1).Benthic organisms rapidly multiplied,consuming large amounts of oxygen and destroying the previously depositional environment,resulting in a reducing environment disturbed by benthic organisms with poor preservation conditions and the lowest organic matter content.

关键词： major and trace elements paleoenvironment evolution OM enrichment mechanism lacustrine shale Songliao Basin Qingshankou Formation

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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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Fault characteristics and their control on oil and gas accumulation in the southwestern Ordos Basin

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Energy Geoscience 2024年第1期5卷 162-171页

作者： Yongtao Liu Shuanghe Dai Yijun Zhou Fufeng Ding Mingjie Li Xingyun Li Yu Zhao Binhua Guo Tong Li Junan Han research institute of Oriental Geophysical Company CNPCXi'an710021China State Key Laboratory of Continental Dynamics Northwest UniversityXi'an710069China exploration Department of petrochina Changqing Oilfield Company Xi'an710018China

3D seismic data recently acquired from the Ordos Basin shows three sets of regularly distributed fault systems,which overrides previous understanding that no faults were developed in this *** interpretation suggests that the faults in the southwestern Ordos Basin have three basic characteristics,namely extreme micro-scale,distinct vertical stratification,and regularity of planar *** NS-,NW-,and NE-trending fault systems developed in the Meso-Neoproterozoic e Lower Ordovician *** these,the NS-trending fault system mainly consists of consequent and antithetic faults which show clear syndepositional *** fault systems in the Carboniferous e Middle-Lower Triassic strata are not clear on seismic reflection *** NW-and NE-trending fault systems are developed in the Upper Triassic e Middle Jurassic *** these,the NW-trending fault system appears as a negative flower structure in sectional view and in an en echelon pattern in plan-view;they show transtensional deformation.A NE-trending fault system that developed in the Lower Cretaceous e Cenozoic strata shows a Y-shaped structural style and tension-shear properties.A comprehensive analysis of the regional stress fields at different geologic times is essential to determine the development,distribution direction,and intensity of the activity of fault systems in the Ordos *** exploration suggests three aspects in which the faults within the Ordos Basin are crucial to oil and gas ***,these faults serve as vertical barriers that cause the formation of two sets of relatively independent petroleum systems in the Paleozoic and Mesozoic strata respectively;this is the basis for the‘upper oil and lower gas’distribution ***,the vertical communication of these faults is favorable for oil and gas migration,thus contributing to the typical characteristics of multiple oil and gas fields within the basin,*** and gas reservoirs with multiple

关键词： Coherent attribute Strike-slip fault Flower structure Shale oil Ordos basin

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Sedimentary characteristics and lithofacies paleogeography of the Cambrian in Sichuan basin,Southwest China

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Petroleum 2024年第2期10卷 224-242页

作者： Lin Xie Xuefei Yang Yanhong Zhang Yan Xu Deming Zeng Ruifeng Tang Yao Du Xingzhi Wang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500China Schlumberger China S.A. Beijing100016China research institute of exploration and development PetroChina Southwest Oil&Gas Field CompanySichuan Chengdu610041China

Cambrian in Sichuan basin developed thick black shale,varies carbonate and clastic rock,which deposited in different sedimentary *** basin in the upper Yangtze platform contained a record of environment during the *** facies analyses of Cambrian enable us to discuss the sedimentary environment and palaeogeographic *** commenced in the Early Cambrian with the deposition of shelf facies(Qiongzhusi Formation and Canglangpu Formation).At this stage,thick shale and clastic rock deposited in Sichuan *** the end of the Early Cambrian,a carbonate platform developed in upper Yangtze platform,and Sichuan basin was located in restricted platform(Longwangmiao Formation).In the Middle Cambrian,tidal flat and restricted platform developed in Sichuan basin(Douposi Formation),because of continuous *** the Late Cambrian,Sichuan basin was located in carbonate platform again(Xixiangchi Formation).There are three types of sedimentary system in the Cambrian of Sichuan basin:clastic sedimentary system,clastics-carbonate mixed sedimentary system and carbonate sedimentary ***,the basin shows the evolutionary character of clastic-carbonate sedimentary *** three sedimentary systems correspond to three“transgression-regression”cycles of the *** transgression in the initial period of the Early Cambrian led to the formation of clastic sedimentary system in the Qiongzhusi Formation of Lower *** transgression in the later period of the Early Cambrian led to the formation of clasticcarbonate mixed sedimentary system in the Middle-Lower *** transgression in the initial period of the Late Cambrian led to the formation of carbonate sedimentary system in the Xixiangchi Formation of Upper *** the end of Late Sinian continental rifting ended,Sichuan basin entered a stable evolutionary stage of the craton basin,while the paleo-land developed in the north and *** Qiongzhusi-

关键词： Sichuan basin Cambrian Sedimentary characteristics Lithofacies paleogeography

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Multi-spherical interactions and mechanisms of hydrocarbon enrichment in the Southeast Asian archipelagic tectonic system

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Science China Earth Sciences 2024年第2期67卷 566-583页

作者： Rixiang ZHU Hongjun WANG Huajian WANG Xiaomei WANG Bo WAN Wang ZHANG Houqin ZHU Yuke LIU Junlai LIU Qingren MENG Fang HAO Zhijun JIN State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Enhanced Oil and Gas Recovery PetroChina Research Institute of Petroleum Exploration and DevelopmentBeijing100083China School of Earth Sciences and Resources China University of GeosciencesBeijing100083China State Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580China institute of Energy Peking UniversityBeijing100871China

Global cooling began since 50 Ma,but a warm climate was maintained in the archipelagic tectonic system in Southeast Asia where a wealth of Cenozoic oil and gas resources was formed and *** the perspective of Earth system,this study analyzes Cenozoic tectonic activities,climatic and environmental evolution,and petroleum enrichment in Southeast Asia,and provides the following insights:(1)Subduction of oceanic plates and the extension of overlying continental lithosphere resulted in widespread volcanic eruptions as well as the formation of rift basins and shallow marine shelves,leading to complex interactions between deep tectonic processes and Earth’s surface including mountains,basins,and seas.(2)Microcontinental accretion and prolonged stay in equatorial low-latitude regions have changed trade winds into monsoons,altered ocean current pathways and flow rates,and profoundly affected rainfall and climate.(3)The archipelagic tectonic system,coupled with a hot and rainy climate,fostered tropical rainforests,mangroves,and phytoplankton,providing abundant organic matter and promoting the development of petroleum resources.(4)Combinations of rift basin development and marine transgression and regression led to an effective superposition of source-reservoir-seal combinations from multiplepetroleum *** deep burial of organic matter and high geothermal gradients facilitated the generation and large-scale accumulation of oil and gas.(5)Multi-spherical(such as atmosphere,biosphere,hydrosphere and lithosphere)interactions on the Earth,which resulted from the convergence of multiple tectonic plates,are believed as the primary driver for exceptional enrichments of Cenozoic oil and gas resources in Southeast *** understandings are significant for developing theories of oil and gas enrichment under the guidance of Earth System *** order to continue making significant oil and gas exploration discoveries in the deep-layers,deep-waters,and unconventio

关键词： Southeast Asia Archipelagic tectonic system Interactions of Earth’s spheres Oil and gas resources Cenozoic

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Influence of shale reservoir properties on shale oil mobility and its mechanism

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Energy Geoscience 2024年第4期5卷 212-223页

作者： Jijun Li Hang You Xinwen Zhang Suping Zhao Fujie Jiang Guoqi Feng Yue Su Yinwu Zhang Jiaheng Xue Shandong Provincial Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580China School of Geosciences China University of Petroleum(East China)Qingdao266580China exploration&development research institute of Henan Oilfield Company Zhengzhou450000China petrochina research institute of Petroleum exploration&development Beijing100083China State Key Laboratory of Petroleum Resources and Prospecting Beijing102249China College of Geoscience China University of Petroleum(Beijing)Beijing102249China Department of Physics Xiamen University MalaysiaBandar Sunsuria43900 SepangSelangorMalaysia

Given the tremendous potential for continental shale oil in China,many oilfields in the central and eastern parts of the country are involved in the exploration and development of shale oil *** engineering factors,shale oil mobility is the key to determining its commercial *** study explores the Hetaoyuan Formation in the Biyang Depression as an example to determine the influence of reservoir properties on the movable oil volume and its *** techniques were used,including displacement nuclear magnetic resonance(NMR),low-temperature nitrogen adsorption(LTNA),X-ray diffraction(XRD)bulk mineral analysis,and scanning electron microscopy(SEM),and the results suggest that large average pore diameter,high throat to pore ratio,single pore morphology,and small specific surface area can weaken the boundary layer effect and reduce the amount of adsorbed *** observations reveal that compared to the dissolution pores and intergranular pores in brittle minerals,the intercrystalline pores in terrigenous clastic clay minerals are more affected by ***,authigenic clay minerals notably block the intergranular pores in the interbedded *** minerals are identified as the main contributor to the specific surface area,with high clay mineral content enhancing the pore heterogeneity of the ***,positive shale oil mobility occurs in shale with a weak boundary layer effect,which is attributed to the high brittle mineral content,large average pore diameter,small specific surface area,single pore morphology,and reservoir homogeneity.

关键词： Biyang depression Hetaoyuan formation Shale oil Mobility Nuclear magnetic resonance

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Scale Economy development Strategies for Deep Shale Gas in China

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China Oil & Gas 2024年第4期31卷 40-45页

作者： Huang Shihong Lu Yanlin Tang Jian Xiong Jie Hu Xi Fu Bin Yu Zhibo Sichuan Shale Gas exploration and development Co. Ltd. development Division PetroChina Southwest Oil&Gasfield Company research institute of Natural Gas Economy PetroChina Southwest Oil&Gasfield Company

China has rich deep shale gas resources,which will be an important source for an increase in China’s natural gas production in a certain period in the *** its large-scale efficient development is of strategic importance in ensuring national energy *** article analyses and summarizes the opportunities and challenges in China’s scale economy development of shale ***:China’s natural gas market has immense potential,and the prospects for shale gas development are broad;the national and local governments value and support the exploration and development of shale gas;there is a rich resource base that allows for rapid production increase and stable output of deep shale gas;technological advancements will accelerate the pace of scale economy development of deep gas resources.

关键词： shale advancement strategic

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Evaluation and Application of Flowback Effect in Deep Shale Gas Wells

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Fluid Dynamics & Materials Processing 2024年第10期20卷 2301-2321页

作者： Sha Liu Jianfa Wu Xuefeng Yang Weiyang Xie Cheng Chang Shale Gas research institute PetroChina Southwest Oil&Gas field CompanyChengdu610051China

The pivotal areas for the extensive and effective exploitation of shale gas in the Southern Sichuan Basin have recently transitioned from mid-deep layers to deep *** challenges such as intricate data analysis,absence of effective assessment methodologies,real-time control strategies,and scarce knowledge of the factors influencing deep gas wells in the so-called flowback stage,a comprehensive study was undertaken on over 160 deep gas wells in Luzhou block utilizing linear flow models and advanced big data analytics *** research results show that:(1)The flowback stage of a deep gas well presents the characteristics of late gas channeling,high flowback rate after gas channeling,low 30-day flowback rate,and high flowback rate corresponding to peak production;(2)The comprehensive parameter AcmKm1/2 in the flowback stage exhibits a strong correlation with the Estimated Ultimate Recovery(EUR),allowing for the establishment of a standardized chart to evaluate EUR classification in typical shale gas wells during this *** enables quantitative assessment of gas well EUR,providing valuable insights into production potential and performance;(3)The spacing range and the initial productivity of gas wells have a significant impact on the overall effectiveness of gas ***,it is crucial to further explore rational well patterns and spacing,as well as optimize initial drainage and production technical strategies in order to improve their performance.

关键词： Deep shale gas flowback characteristic EUR forecast effect evaluation main controlling factors

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Intricate Fault Systems in Longmenshan Structural Belt's Northern End: Exploring Structural Evolution and Seismic Rupture Behavior in the Eastern Tibetan Plateau

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Journal of Earth Science 2024年

作者： Hanyu Huang Renqi Lu Dengfa He Jinliang Gao Weikang Zhang Lingyu Kang State Key Laboratory of Earthquake Dynamics， institute of Geology China Earthquake Administration State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， institute of Sedimentary Geology， Chengdu University of Technology College of Energy Resources， China University of Geosciences petrochina research institute of Petroleum exploration and development

The Longmenshan Structural Belt on the eastern edge of the Tibetan Plateau experienced the impactful Mw 7.9 2008 Wenchuan earthquake， causing a 350 km surface rupture. Traditional models attribute this to the Beichuan and Pengguan faults， but our research reveals a complex fault system at the northern end， with inconsistencies in surface rupture， aftershock distribution， and focal mechanisms. We integrates shallow geology， active source seismic reflection， and magnetotelluric profiling to establish a deep structural model for the northern end of the Longmenshan Structural Belt. This area exhibits dominant reverse thrust nappe tectonics， and analyzing the tectonic evolution history provides insights into deformation propagation from the orogenic belt toward the Sichuan Basin. Focal mechanism analysis and relocated aftershock data reveals two distinct types of seismogenic structures in the northern end of the Longmenshan Structural Belt. In the middle to northern segments， the reverse fault type is attributed to reactivated pre-existing faults. Conversely， at the northern end， the strike-slip fault type originates from high-angle co-seismic rupture cutting through pre-existing reverse faults. This study enhances our understanding of fault complexity and seismic mechanisms in the northeastern Longmenshan Structural Belt， providing new insights into regional tectonics.

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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

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