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Influence of supercritical CO_(2)on the physical property of tight sandstone

Petroleum 2024年第3期10卷 520-526页

作者： Huan Peng Jian Yang Junliang Peng Huifen Han Xinghao Gou Yucheng Jia Yibo Li Valeriy Kadet Engineering Technology Research Institute of Southwest oil&gas Field Company PetroChinaChengdu610017China key laboratory of oil&gas Well Stimulation Technology of Southwest oil&gas Field Company Chengdu610017China State key laboratory of oil&gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Gubkin Russia State University of oil and gas Moscow119991Russia

In low-pressure gas reservoirs,water-based fracture fluid is difficult to flowback,which is unfavorable for several tight sandstone gas reservoirs in the Sichuan basin with low pressure and high permeability geological *** CO_(2)possesses a number of remarkable physical and chemical features,including a density near to water,a viscosity close to gas,and high *** CO_(2)fracturing is a new type of non-aqueous fracturing method that is favorable to fracturing flowback in low-pressure tight sandstone and has a wide range of *** discuss on whether supercritical CO_(2)fracturing with low pressure tight sandstone is *** sandstone cores from the Jinqiu gas field in the Sichuan basin were used to study the influence of supercritical CO_(2)on the physical properties of sandstone *** CO_(2)was used to interact with tight sandstone samples,and then the changes in porosity,permeability,and rock microstructure of tight sandstone were observed under various time,pressure,and temperature *** the interaction between tight sandstone and supercritical CO_(2),new dissolution pores will appear,or the original pores will be increased,and the width of some natural fractures will also be increased,and the porosity will increase by 1.09%-8.85%,and the permeability will increase by 2.34%-21.26%,quantifying the influence of supercritical CO_(2)on physical properties of tight sandstone,and further improving the interaction mechanism between supercritical CO_(2)and tight *** study improves in the understanding of the tight sandstone-supercritical CO_(2)interaction mechanism,as well as providing an experimental foundation and technological guarantee for field testing and use of supercritical CO_(2)in low-pressure tight sandstone gas reservoirs.

关键词： Supercritical CO_(2) Low pressure tight sandstone Porosity Permeability Microstructure

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Insights into in-situ imbibition behavior of fracturing fluid in propped shale fractures based on nuclear magnetic resonance:A case study from Longmaxi Formation shale,Sichuan basin,China

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Petroleum Science 2024年第1期21卷 410-429页

作者： Jing-Jing Guo Kai-Xiang Di Lie-Hui Zhang Yu-Long Zhao Hui-Ying Tang Rui-Han Zhang Ye Tian National key laboratory of oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina

Shale gas is an important component of unconventional oil and gas *** the imbibition behavior is helpful to optimize flowback parameters and enhance gas *** imbibition studies have focused on shale matrix,and the pressure conditions discussed were mostly *** initial imbibition behavior begins from propped fractures to matrix,but there are few studies working on explaining the imbibition behavior in propped fractures or the phenomenon of many shale wells exhibit higher productivity after a“soaking”***,propped fracture samples were designed for imbibition and migration *** order to accurately study the mechanism and main influencing factors of fracturing fluid imbibition and migration in propped and unpropped shale fractures under high temperature and high pressure,a series of experiments based on nuclear magnetic resonance(NMR)were carried *** showed that NMR T_(2) spectra of all samples exhibited a bimodal *** final imbibition volume of fracturing fluid was positively related to pressure and fracture *** imbibition effect of fracturing fluid was more evident in matrix pores under high *** the migration during soaking stage,the fracturing fluid gradually migrated from large pores to small pores and gradually displaced the shale gas from the matrix,thus allowing the water blocking in propped fractures to self-unlock to some *** permeability decreased in the imbibition stage,while it recovered in the migration stage to some extent.

关键词： Forced imbibition Migration Soaking NMR T_(2)spectra Propped fracture Permeability recovery

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Paleoenvironmental Evolution and Organic Matter Enrichment Genesis of the Late Turonian Black Shale in the Southern Songliao basin, NE China

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Acta Geologica Sinica(English Edition) 2024年第5期98卷 1338-1358页

作者： BAI Jing XU Xingyou LIU Weibin ZHAO Wenzhi JIANG Hang State key laboratory of Continental Shale oil key laboratory of Unconventional oil and gas China Geological Survey oil and gas Survey China Geological Survey Research Institute of Petroleum Exploration Development of PetroChina Strategic Research Center of oil and gas resources Ministry of Natural Resources

The Upper Cretaceous Qingshankou Formation black shales, deposited in the late Turonian(LTB shales), are the main source rocks of the Songliao basin. The origins of organic matter enrichment of the shales is a contentious subject fuelling many ongoing debates. This study investigates the genesis of the organic matter-rich shale by using molecular geochemistry. The LTB shales can be divided into three sections. The Section Ⅰ shales were deposited in saline, stratified and anoxic water conditions, which are related to seawater incursion events. At least three episodic and periodic seawater incursion events were recognized during Section Ⅰ shale deposition. The Section Ⅱ shales deposited in brackish to fresh and deep lake-level conditions with high primary productivity, which are related to lake-level transgression. The Section Ⅲ shales were deposited under fresh and slightly oxidized water conditions, which are related to lake-level regression. Two organic matter enrichment models for the LTB shales are identified, that is, the seawater incursion model and the maximum lake-level transgression sedimentation model, which act on different shale sections, both playing significant roles in the enrichment of organic matter.

关键词： Cretaceous enrichment genetics late Turonian organic matter-rich shale paleoenvironmental evolution Songliao basin

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Multi-spheric interactions driven differential formation and accumulation of hydrocarbon resources in the North Sea basin

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Science China Earth Sciences 2024年第11期67卷 3397-3420页

作者： Rixiang ZHU Shuichang ZHANG Huajian WANG Xiaomei WANG Yuke LIU Wang ZHANG Fang HAO Zhijun JIN key laboratory of Deep Petroleum Intelligent Exploration and Development Institute of Geology and Geophysics Chinese Academy of Sciences State key laboratory of Enhanced oil & gas Recovery Research Institute of Petroleum Exploration and Development China National Petroleum Corporation State key laboratory of Deep oil and gas China University of Petroleum (East China) Institute of Energy Peking University

The North Sea basin is the most important oil and gas producing area in Europe and the birthplace of many classic petroleum geological theories. From the perspective of multi-spheric interactions in the Earth, this study investigated the riftforeland-rift evolution process of the North Sea basin, which was controlled by the deep dynamic driving forces of the continental collision orogeny, mantle plume uplift, and intraplate deformation. The North Sea basin was found to have drifted northward since the Carboniferous and passed through the low-latitude Hadley and the mid-latitude Ferrel cells. Two sets of main hydrocarbon source rocks have formed, the coals and coal measures of the Upper Carboniferous Westphalian and the marine shale of the Upper Jurassic Kimmeridge Clay Formation. We propose that the deep processes, tectonic activity, and transgression-climate evolution jointly controlled the types and horizons of the source rocks, reservoirs, and seals in different regions of the North Sea basin. In the southern North Sea basin, a Carboniferous-Lower Triassic gas-rich petroleum system was formed,which is characterized by transitional coal measure source rocks, desert aeolian sandstone reservoirs, and evaporite cap rocks. In the northern North Sea basin, an Upper Triassic-Paleogene oil-rich petroleum system was formed, which is characterized by marine graben-type source rocks, deltaic sandstone and marine limestone reservoirs, and marine tight marl and shale cap *** late tectonic burial and uplift in the North Sea basin further controlled the processes of oil and gas generation and accumulation, ultimately leading to a differential distribution pattern which is oil rich in the northern part and gas rich in the southern part of the basin. In the future, there is an urgent need to re-examine the mechanisms for the petroleum generation and accumulation in large mature exploration areas(e.g., super basins such as the North Sea) and low exploration areas(e.g., the O

关键词： North Sea basin Multi-spheric interactions Petroleum system Okhotsk Sea region

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Low Resource Chinese Geological Text Named Entity Recognition Based on Prompt Learning

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Journal of Earth Science 2024年第3期35卷 1035-1043页

作者： Hang He Chao Ma Shan Ye Wenqiang Tang Yuxuan Zhou Zhen Yu Jiaxin Yi Li Hou Mingcai Hou State key laboratory of oil and gas Reservoir Geology and Exploitation Institute of Sedimentary GeologyCollege of Computer Science and Cyber SecurityChengdu University of TechnologyChengdu 610059China key laboratory of Deep-Time Geography and Environment Reconstruction and Applications of Ministry of Natural resources Chengdu University of TechnologyChengdu 610059China School of Information Engineering China University of Geosciences(Beijing)Beijing 100083China

Geological reports are a significant accomplishment for geologists involved in geological investigations and scientific research as they contain rich data and textual *** the rapid development of science and technology,a large number of textual reports have accumulated in the field of ***,many non-hot topics and non-English speaking regions are neglected in mainstream geoscience databases for geological information mining,making it more challenging for some researchers to extract necessary information from these *** Language Processing(NLP)has obvious advantages in processing large amounts of textual *** objective of this paper is to identify geological named entities from Chinese geological texts using NLP *** propose the RoBERTa-Prompt-Tuning-NER method,which leverages the concept of Prompt Learning and requires only a small amount of annotated data to train superior models for recognizing geological named entities in low-resource dataset *** RoBERTa layer captures context-based information and longer-distance dependencies through dynamic word ***,we conducted experiments on the constructed Geological Named Entity Recognition(GNER)*** experimental results show that the proposed model achieves the highest F1 score of 80.64%among the four baseline algorithms,demonstrating the reliability and robustness of using the model for Named Entity Recognition of geological texts.

关键词： Prompt Learning Named Entity Recognition(NER) low resource geological text text information mining big data geology.

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Uncovering the largest negative carbon isotope excursion in Earth history

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Science China Earth Sciences 2024年第3期67卷 885-889页

作者： Chao LI Haiyang WANG State key laboratory of oil and gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Institute of sedimentary Geology Chengdu University of TechnologyChengdu 610059China key laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural resources Chengdu University of TechnologyChengdu 610059China International Center for sedimentary Geochemistry and Biogeochemistry Research Chengdu University of TechnologyChengdu 610059China State key laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China

The carbon cycle plays a pivotal role in regulating Earth’s surface environment through atmospheric-oceanic acid-base and redox processes, functioning as the engine driving the evolution of our planet’s surface. A deep understanding of the carbon cycle’s evolution is thus essential for our understanding of the evolution of our planet’s habitability.

关键词： carbon planet evolution

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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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Three-dimensional structural models,evolution and petroleum geological significances of transtensional faults in the Ziyang area,central Sichuan basin,SW China

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Petroleum Exploration and Development 2024年第3期51卷 604-620页

作者： TIAN Fanglei GUO Tonglou HE Dengfa GU Zhanyu MENG Xianwu WANG Renfu WANG Ying ZHANG Weikang LU Guo School of Energy resources China University of Geosciences(Beijing)Beijing 100083China key laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of EducationBeijing 100083China Sinopec Southwest oil and gas Company Chengdu 610031China

With drilling and seismic data of Transtensional(strike-slip)Fault System in the Ziyang area of the central Sichuan basin,SW China plane-section integrated structural interpretation,3-D fault framework model building,fault throw analyzing,and balanced profile restoration,it is pointed out that the transtensional fault system in the Ziyang 3-D seismic survey consists of the northeast-trending F_(I)19 and F_(I)20 fault zones dominated by extensional deformation,as well as 3 sets of northwest-trending en echelon normal faults experienced dextral shear *** them,the F_(I)19 and F_(I)20 fault zones cut through the Neoproterozoic to Lower Triassic Jialingjiang Formation,presenting a 3-D structure of an“S”-shaped *** before Permian and during the Early Triassic,the F_(I)19 and F_(I)20 fault zones underwent at least two periods of structural ***,the 3 sets of northwest-trending en echelon normal faults are composed of small normal faults arranged in pairs,with opposite dip directions and partially left-stepped *** before Permian,they had formed almost,restricting the eastward growth and propagation of the F_(I)19 fault *** F_(I)19 and F_(I)20 fault zones communicate multiple sets of source rocks and reservoirs from deep to shallow,and the timing of fault activity matches well with oil and gas generation *** there were favorable Cambrian-Triassic sedimentary facies and reservoirs developing on the local anticlinal belts of both sides of the F_(I)19 and F_(I)20 fault zones,the major reservoirs in this area are expected to achieve breakthroughs in oil and gas exploration.

关键词： transtensional(strike-slip)fault three-dimensional structural model structural evolution petroleum geological significance Ziyang area Sichuan basin

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The formation and evolutionary characteristics of organic matter and pyrites in the continental shales of the 3^(rd)submember of Chang 7 Member,Yanchang formation,Ordos basin,China

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Energy Geoscience 2024年第2期5卷 31-39页

作者： Ruikang Bian State key laboratory of Shale oil and gas Enrichment Mechanisms and Effective Development Beijing 102206China key laboratory of Shale oil and gas Exploration&Production Technology SinopecBeijing 102206China SINOPEC Exploration&Production Research Institute Beijing102206China

Through microscopic analyses(e.g.,organic macerals,thin section observation,scanning electron microscope(SEM)imaging of fresh bedding planes via argon ion milling,and energy spectrum tests)combined with Rock-Eval analyses,this study systematically investigated the organic matter and pyrites in the continental shales in the 3^(rd)submember of the Chang 7 Member(Chang 7^(3)submember)in the Yanchang Formation,Ordos basin and determined their types and the formation and evolutionary *** results are as *** organic matter of the continental shales in the Chang 7^(3)submember is dominated by amorphous bituminites and migrabitumens,which have come into being since the early diagenetic stage and middle diagenetic stage A,*** formation and transformation of organic matter is a prerequisite for the formation of *** Ordos basin was a continental freshwater lacustrine basin and lacked sulphates in waters during the deposition of the Chang 7 ***,the syndiagenetic stage did not witness the formation of large quantities of *** the basin entered early diagenetic stage A,large quantities of sulfur ions were released as the primary organic matter got converted into bituminites and,accordingly,pyrites started to ***,this stage featured poorer fluid and spatial conditions compared with the syndepositional stage due to withdraw of water,the partial formation of bituminites,and a certain degree of *** a result,large quantities of pyrrhotite failed to transition into typical spherical framboidal pyrites but grew into euhedral monocrystal *** addition,pyrites are still visible in the migrabitumens in both microfractures and inorganic pores of mudstones and shales,indicating that the pyrite formation period can extend until the middle diagenetic stage A.

关键词： Organic matter Pyrite Formation and evolution Continental shale Chang 7^(3)submember Ordos basin

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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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