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| 1 | Progress in China's Unconventional Oil & Gas Exploration and Development and Theoretical Technologies显示文摘The new century has witnessed a strategic breakthrough in unconventional oil & gas.Hydrocarbon accumulated in micro-/nano-scale pore throat shale systems has become an important domain that could replace current oil & gas resources.Unconventional oil & gas plays an increasingly important role in our energy demand.Tight gas,CBM,heavy oil and asphaltic sand have served as a key domain of exploration & development,with tight oil becoming a 'bright spot' domain and shale gas becoming a 'hotspot' domain.China has made great breakthroughs in unconventional oil & gas resources,such as tight gas,shale gas,tight oil and CBM,and great progress in oil shale,gas hydrate,heavy oil and oil sand.China has an estimated(223-263)×10~8t of unconventional oil resources and(890-1260)×l0^(12)m^3 of gas resources.China has made a breakthrough for progress in unconventional oil & gas study.New progress achieved in fine-grained sedimentary studies related to continental open lacustrine basin large-scale shallow-water delta sand bodies,lacustrine basin central sandy clastic flow sediments and marine-continental fine-grained sediments provide a theoretical basis for the formation and distribution of basin central reservoir bodies.Great breakthroughs have been made in unconventional reservoir geology in respect of research methodology & technology,multi-scale data merging and physical simulation of formation conditions.Overall characterization of unconventional reservoirs via multi-method and multi-scale becomes increasingly popular and facilitates the rapid development of unconventional oil & gas geological theory,method and technology.The formation of innovative,continuous hydrocarbon accumulation theory,the establishment of the framework of the unconventional oil & gas geological theory system,and the determination of the implications,geological feature,formation mechanism,distribution rule and core technology of unconventional oil& gas geological study lays a theoretical foundation for extensive unconventional oil & gas exploration and development.Theories and technologies of unconventional oil & gas exploration and development developed rapidly,including some key evaluation techniques such as 'sweet spot zone' integrated evaluation and a six-property evaluation technique that uses hydrocarbon source,lithology,physical property,brittleness,hydrocarbon potential and stress anisotropy,and some key development &engineering technologies including micro-seismic monitoring,horizontal drilling & completion and 'factory-like' operation pattern, 'man-made reservoir' development,which have facilitated the innovative development of unconventional oil & gas.These breakthroughs define a new understanding in four aspects:①theoretical innovation;② key technologies;③ complete market mechanism and national policy support;and ④ well-developed ground infrastructure,which are significant for prolonging the life cycle of petroleum industry,accelerating the upgrade and development of theories and technologies and altering the global traditional energy structure. | ZOU Caineng YANG Zhi ZHU Rukai ZHANG Guosheng HOU Lianhua WU Songtao TAO Shizhen YUAN Xuanjun DONG Dazhong WANG Yuman WANG Lan HUANG Jinliang WANG Shufang | 2015 | Acta Geologica Sinica(English Edition)2015，89，3： | 27 |
| 2 | Geologic Characteristics of Volcanic Hydrocarbon Reservoirs and Exploration Directions in China显示文摘Volcanic rocks are distributed widely in China, which are important exploration targets. By analyzing many discovered volcanic hydrocarbon reservoirs all over the world, the authors summarized the geologic characteristics of the formation of volcanic hydrocarbon reservoirs in China, and gave further exploration directions and advices. (1) There are mainly Carboniferous-Permian, Jurassic-Cretaceous, Paleogene-Neogene volcanic rocks in oil- and gas-bearing basins in China, which are mainly distributed in the Junggar Basin, Songliao Basin, Bohai Bay Basin, etc. There are mainly intermediate rocks and acidic rocks in east China, and intermediate rocks and basic rocks in west China. They primarily develop in intracontinental rift settings and island arc environments. (2) Pore- fissure reservoirs are distributed widely in basins, which are volcanic rocks mainly in explosive and effusive facies. (3) Volcanic hydrocarbon reservoirs are chiefly near-source lithostratigraphic hydrocarbon reservoirs, and the oil and gas accumulation is predominantly controlled by lithotypes, faults and structural positions. (4) Deep-seated oil and gas reservoirs in the Songliao Basin and Carboniferous volcanic hydrocarbon reservoirs in the Junggar Basin are potential giant volcanic gas provinces, the volcanic hydrocarbon reservoirs in the Bohai Bay Basin and Santanghu Basin are favorable for oil and gas reserves increase, and volcanic rocks in the Turpan Basin, Sichuan Basin, Tarim Basin have exploration potentiality. (5) The technology series of oil and gas exploration in volcanic rocks have been preliminarily formed. | ZOU Caineng ZHU Rukai ZHAO Wenzhi JIA Chengzao ZHANG Guangya YUAN Xuanjun ZHAO Xia WEN Baihong | 2010 | Acta Geologica Sinica(English Edition)2010，84，1： | 10 |
| 3 | Hydrocarbon accumulation mechanism and structure of largescale volcanic weathering crust of the Carboniferous in northern Xinjiang,China显示文摘上面在北 Xinjiang 含碳,中国在 post-collisional 消沉被形成并且折叠结构的设定。在一个宽区域上在上面的含碳的、暴烈的岩石和来源岩石以内轮流出现。在结束含碳,这些层被板碰撞高举并且随后捱过并且沥滤。暴烈的捱过并且沥滤导致了能被划分成五层的捱过的外壳的建立。腐蚀并且在这些层形式弄碎地区有利水库。在亚在空中形成的暴烈的捱过外壳暴露了 paleogeomorphic 区域;五相对连续的层通常在 paleogeomorphic 低地和斜坡区域被保存,但是上面的土壤层在岩石的更高的部分记录的在结构上通常是不在的。捱过的层的厚度有一种积极非线性的指数的关系到捱过并且沥滤的持续时间,并且捱过的外壳的动态平衡时间是大约 36.3 妈。最厚的捱过的层(450 m ) 位于破裂地区。捱过的外壳从有不同岩性学的暴烈的岩石的一个范围是可能的,捱过并且沥滤的给定的足够的时间。暴烈的捱过的外壳和来源岩石的联合导致烃累积模型的三种类型:(1 ) 与来源岩石暴烈的捱过的外壳 interbedded 定序,(2 ) 一个伪分层的捱过的暴烈的核心定位了上面的来源岩石,并且(3 ) 暴烈的岩石与邻近的梳状的不顺从联系了采购岩石。每这三种类型有潜力形成暴烈的捱过的外壳的一座巨大的 stratigraphic 水库。这知识改变了在暴烈的岩石中寻找有利 lithologic 和岩相地区的传统的探索模型,并且改变了观点含碳没有基因潜力是在北 Xinjiang 的盆的地下室。这里开发的概念为在暴烈的捱过的外壳上集中油和煤气的探索具有大科学意义和申请。因此,在中国的 midwestern 部分的古生代的暴烈的捱过的外壳可以可能包含大规模 stratigraphic 水库并且以后能因此是新油和煤气的探索目标。 | ZOU CaiNeng HOU LianHua TAO ShiZhen YUAN XuanJun ZHU RuKai JIA JinHua ZHANG XiangXiang LI FuHeng PANG ZhengLian | 2012 | Science China Earth Sciences2012，55，2： | 8 |
| 4 | Structure of weathered clastic crust and its petroleum potential显示文摘Weathered clastic crust can be subdivided into weathered clay and leached zone in terms of variable weathering of different minerals and mobility of weathered products.On the basis of clastic outcrops and well cores in the Junggar Basin,the dark red Fe-rich weathered clay is formed in an arid environment,whereas the light blue Al-rich weathered clay under humid conditions.According to the geochemical analysis,a new weathering index for weathered clastic crust is built mainly on Fe and Al contents,accurately indicating the weathered clay,sandy leached zone,and muddy leached zone in the Junggar Basin.The breaking pressure of weathered clay is rather large,the same as that of normal muddy cap,effectively to seal oil or gas.The porosity of underlying leached zone is greatly enhanced by weathering and leaching,but its permeability is a function of clay mineral content,i.e.,the higher the clay content,the worse the permeability.Weathered crust provides effective sealing conditions for both top and bottom layers of a petroleum reservoir,and is important in the clastic hydrocarbon exploration. | ZOU CaiNeng HOU LianHua YANG Fan YANG Chun TAO ShiZhen YUAN XuanJun ZHU RuKai | 2014 | Science China Earth Sciences2014，57，12： | 6 |
| 5 | Conglomerate Reservoir Pore Evolution Characteristics and Favorable Area Prediction: A Case Study of the Lower Triassic Baikouquan Formation in the Northwest Margin of the Junggar Basin, China显示文摘This study examines the characteristics and pore evolution of the Baikouquan conglomerate reservoir in the Mahu sag of the Junggar Basin from original sedimentation and diagenesis.Analysis is based on core observation,thin section,X-ray diffraction,cathodoluminescence and image analysis,and combined with physical property and well log data.The results show that conglomerate reservoir in the Baikouquan Formation can be divided into three lithofacies types:TypeⅠis argillaceous filling conglomerate facies,in which cementation and dissolution are not developed,and the interstitial material is mainly argillaceous;TypeⅡis tuffaceous filling in fine conglomerate facies,in which volcanic rock debris,illite and dissolution are developed;TypeⅢis sandstone filling conglomerate facies,in which cementation and dissolution are developed.The reservoir undergoes complex diagenesis,and the diagenetic sequence is:compaction→early chlorite film→early calcite cementation→detritus,feldspar and tuffaceous dissolution→quartz secondary enlargement→late calcite cementation→oil invasion→forming illite.Quantitative study of pore evolution shows that dissolution and calcite cementation are relatively developed in lithofacies Type III,and that compaction has a great influence on lithofacies TypeⅠand II.According to comprehensive evaluation of lithofacies,diagenesis and pore structure characteristics,the reservoir space type is mainly the dissolution pore.It is mainly primarily mainly composed of lithofacies Type III,thickness of the gravel body is more than 25 m,porosity is generally more than 12%,which represents favorable conditions for the distribution of favorable reservoir. | Meng Xiao Songtao Wu Xuanjun Yuan Zongrui Xie | 2021 | Journal of Earth Science2021，32，4： | 2 |
| 6 | Paleo-Environment Reconstruction of the Middle Permian Lucaogou Formation,Southeastern Junggar Basin,NW China:Implications for the Mechanism of Organic Matter Enrichment in Ancient Lake显示文摘The Middle Permian Lucaogou Formation is the source rock and the main oil shale producing formation in the southeastern Junggar Basin.This study focused on the Lucaogou Formation exposed in two outcrop sections on the northern flank of the Bogda Mountain,namely the Jingjingzigou and Dalongkou sections.Here,we present integrated analysis of the sedimentology,major and trace elements,mineral components and total organic carbon contents.The paleo-environment was reconstructed including provenance,redox conditions,paleo-salinity,chemical weathering intensity and primary organic matter productivity.The results showed that the upper and lower units were deposited in distinct depositional environments with different organic matter accumulation mechanisms.The lower unit was characterized by low lake level,dry climate,fresh-brackish and well-oxygenated water.While during the deposition of the upper unit the lake level rose,climate turned wetter and the bottom water became less oxidized and much saltier.The mechanism of the organic matter accumulation is different for these two units.The preserved organic matters were mainly controlled by the primary productivity in the lower unit and by the redox conditions in the upper unit. | Dawei Cheng Chuanmin Zhou Zhijie Zhang Xuanjun Yuan Yinhe Liu Xingyu Chen | 2022 | Journal of Earth Science2022，33，4： | 1 |
| 7 | Fluid Mobility Evaluation of Tight Sandstones in Chang 7 Member of Yanchang Formation, Ordos Basin显示文摘Fluid mobility has been important topic for unconventional reservoir evaluation.The tight sandstones in Chang 7 Member of the Ordos Basin has been selected to investigate the fluid mobility based on the application of core flooding-NMR combined method and core centrifugation-NMR combined method,and the porous structure is studied using optical microscope,field emission scanning electron microscope(FE-SEM),CT and mercury injection.Our results include:(i)Feldsparrock fragments dissolution pores,calcite dissolution pores,clay mineral dissolution pores,intergranular dissolution expansion pores,inter-granular pores,intra-kaolinite pores,and intra-illite/smectite mixed layer pores are developed in Chang 7 tight sandstones;3D CT pore structure shows that the pore connectivity is positively related to physical properties,and the overall storage space is connected by the throat with diameter between 0.2 and 0.3μm.The percentage of storage space connected by throats with diameter less than 100 nm can reach more than 35%.(ii)Movable fluid saturation of Chang 7 tight sandstones is between 10%and 70%,and movable oil saturation is between 10%and 50%.Movable fluid saturation may cause misunderstanding when used to evaluate fluid mobility,so it is recommended to use movable fluid porosity in the evaluation of fluid mobility.The porosity ranging from 5%to 8%is the inflection point of the fluidity and pore structure.For samples with porosity less than 8%,the movable fluid porosity is generally less than 5%.Moreover,the movable fluid is mainly concentrated in the storage space with a throat diameter of 0.1 to 1μm.For samples with porosity greater than 8%,the porosity of the movable fluid is more than 5%,and the movable fluid is mainly concentrated in the storage space with a throat diameter of 0.2 to 2μm.(iii)The movable fluid saturation measured by core flooding-NMR combined method is generally higher than that measured by core centrifugation-NMR combined method.The former can evaluate the mobility of the oil-water two-phase fluid in samples,while the latter can better reflect the pore structure and directly evaluate the movable fluid in the pore system controlled by different throat diameters.All these results will provide valuable reference for fluid mobility evaluation in tight reservoirs. | Songtao Wu Shixiang Li Xuanjun Yuan Zhi Yang Aifen Li Jingwei Cui Songqi Pan Zhiguo Mao Ling Su You Zhou | 2021 | Journal of Earth Science2021，32，4： | 1 |
| 8 | Rock Types and Reservoir Characteristics of Shahejie Formation Marl in Shulu Sag, Jizhong Depression, Bohai Bay Basin显示文摘Due to the complicated lithology in the ES3 Member of the Shahejie Formation in the Shulu sag,Jizhong depression,it is difficult to classify the rock types and characterize the reservoirs at the marl intervals.In this paper,a four-element classification method has been proposed,and seven rock types have been identified by analyzing the mineral composition.The primary rock types are medium-high organic carbonate rocks and medium-high organic shaly-siliceous carbonate rocks.With the methods of field emission scanning electron microscopy,high-pressure mercury intrusion,nitrogen adsorption,and nano-CT,four types of reservoir spaces have been identified,including intra-granular pores,intergranular pores(inter-crystalline pores),organic pores,and micro-fractures.By combining the method of high-pressure mercury intrusion with the method of the nitrogen adsorption,the porosity of the marl has been measured,ranging from 0.73%to 5.39%.The distribution of the pore sizes is bimodal,and the pore types are dominated by micron pores.Through this study,it has been concluded that the sag area to the east of Well ST1H is the favorable area for the development of self-sourced and self-reservoired shale oil.According to the results of geochemical and reservoir analysis,the III Oil Group may have sweet spot layers. | Jingwei Cui Xuanjun Yuan Songtao Wu Ruifeng Zhang Song Jin Yang Li | 2021 | Journal of Earth Science2021，32，4： | 1 |
| 9 | Formation mechanism, geological characteristics and development strategy of nonmarine shale oil in China显示文摘 | Caineng ZOU Zhi YANG Jingwei CUI Rukai ZHU Lianhua HOU Shizhen TAO Xuanjun YUAN Songtao WU Senhu LIN Lan WANG Bin BAI Jingli YAO | 2013 | Petroleum Exploration and Development Online2013，，1： | 1 |
| 10 | Mesh model building and migration and accumulation simulation of 3D hydrocarbon carrier system显示文摘Migration and accumulation simulation of oil and gas in carrier systems has always been a difficult subject in the quantitative study of petroleum geology. In view of the fact that the traditional geological modeling technology can not establish the interrelation of carriers in three dimensional space, we have proposed a hybrid-dimensional mesh modeling technology consisting of body(stratum), surfaces(faults and unconformities), lines and points, which provides an important research method for the description of geometry of sand bodies, faults and unconformities, the 3 D geological modeling of complex tectonic areas, and the simulation of hydrocarbon migration and accumulation. Furthermore, we have advanced a 3 D hydrocarbon migration pathway tracking method based on the hybrid-dimensional mesh of the carrier system. The application of this technology in western Luliang Uplift of Junggar Basin shows that the technology can effectively characterize the transport effect of fault planes, unconformities and sand bodies, indicate the hydrocarbon migration pathways, simulate the process of oil accumulation, reservoir adjustment and secondary reservoir formation, predict the hydrocarbon distribution. It is found through the simulation that the areas around the paleo-oil reservoir and covered by migration pathways are favorable sites for oil and gas distribution. | GUO Qiulin LIU Jifeng CHEN Ningsheng WU Xiaozhi REN Hongjia WEI Yanzhao CHEN Gang GONG Deyu YUAN Xuanjun | 2018 | Petroleum Exploration and Development2018，45，6： | 0 |
| 11 | Alkaline-lacustrine deposition and paleoenvironmental evolution in Permian Fengcheng Formation at the Mahu sag, Junggar Basin,NW China显示文摘Alkaline-lacustrine deposition and its evolution model in Permian Fengcheng Formation at the Mahu sag, Junggar Basin were investigated through core and thin-section observation, geochemical and elemental analysis, logging response and lithofacies identification. Six lithofacies are developed in the Fengcheng Formation. The Feng 2 Member(P1 f2) is dominated by lithofacies with alkaline minerals, while the upper part of the Feng 1 Member(P1 f1) and the lower part of the Feng 3 Member(P1 f3) are primarily organic-rich mudstones that are interbedded with dolomite and dolomitic rock. Paleoenvironment evolution of Fengcheng Formation can be divided into 5 stages, which was controlled by volcanic activity and paleoclimate. The first stage(the early phase of P1 f1) was characterized by intensive volcanic activity and arid climate, developing pyroclastics and sedimentary volcaniclastic rocks. The secondary stage(the later phase of P1 f1) had weak volcanic activity and humid climate that contributed to the development of organic-rich mudstone, forming primary source rock in the Fengcheng Formation. The increasing arid climate at the third stage(the early phase of P1 f2) resulted in shrinking of lake basin and increasing of salinity, giving rise to dolomite and dolomitic rocks. The continuous aird climate, low lake level and high salinity at the fourth stage(the later phase of P1 f2) generated special alkaline minerals, e.g., trona, indicating the formation of alkaline-lacustrine. The humid climate made lake level rise and desalted lake water, therefore, the fifth stage(P1 f3) dominated by the deposition of terrigenous clastic rocks and dolomitic rocks. | ZHANG Zhijie YUAN Xuanjun WANG Mengshi ZHOU Chuanmin TANG Yong CHEN Xingyu LIN Minjie CHENG Dawei | 2018 | Petroleum Exploration and Development2018，45，6： | 0 |
| 12 | Types,characteristics and geological significance of event deposits of Chang 9 Member of Triassic Yanchang Formation in southwestern Ordos Basin,NW China显示文摘Through core observation,thin section identification,and logging and testing data analysis,the types and characteristics of event deposits in the ninth member of Yanchang Formation of Triassic(Chang 9 Member)in southwestern Ordos Basin,China,are examined.There are 4 types and 9 subtypes of event deposits,i.e.earthquake,gravity flow,volcanic and anoxic deposits,in the Chang 9 Member in the study area.Based on the analysis of the characteristics and distribution of such events deposits,it is proposed that the event deposits are generally symbiotic or associated,with intrinsic genetic relations and distribution laws.Five kinds of sedimentary microfacies with relatively developed event deposits are identified,and the genetic model of event deposits is discussed.Seismites are mainly developed in the lake transgression stage when the basin expands episodically,and commonly affected by liquefaction flow,gravity action and brittle shear deformation.Gravity flow,mainly distributed in the high water level period,sandwiched in the fine-grained sediments of prodelta or semi-deep lake,or creates banded or lobate slump turbidite fan.It is relatively developed above the seismites strata.The volcanic event deposits are only seen in the lower part of the Chang 9 Member,showing abrupt contact at the top and bottom,which reflects the volcanic activity at the same time.Anoxic deposits are mostly formed in the late stage of lake transgression to the highstand stage.Very thick organic-rich shales are developed in the highstand stage of Chang 9 Member,and the event deposits in the depositional period of these shales are conducive to potential reservoirs. | WANG Ziye MAO Zhiguo YUAN Xuanjun DENG Xiuqin HUI Xiao ZHANG Zhongyi CUI Jingweil | 2023 | Petroleum Exploration and Development2023，50，3： | 0 |
| 13 | Theory, Technology and Practice of Unconventional Petroleum Geology显示文摘0 INTRODUCTION The breakthroughs in unconventional petroleum have a great impact on world petroleum industry and innovation in petroleum geology(Dou et al,2022;Jia,2017;Zou et al.,2015b,2014a;Yerkin,2012;Pollastro,2007;Schmoker,1995).The exploration and development evolution from conventional petroleum to unconventional petroleum and more and more frequent industrial activities of exploring petroleum inside sources kitchen have deepened theoretical understanding of unconventional petroleum geology and promoted technical research and development(Jia et al.,2021,2017;Jin et al.,2021;Zhao W Z et al.,2020;Ma Y S et al.,2018,2012;Zou et al.,2018b,2016,2009;Dai et al.,2012).We have introduced and extended the theory of continuous hydrocarbon accumulation since 2008 and published several papers/books(in Chinese and English)with respect to unconventional petroleum geology since 2009,basically forming the theoretical framework for this discipline(Yang et al.,2022a,2021a,2019a,,2015a;Zou et al.,2019c,2017b,2014a,,2013a).In this paper,we present the background of unconventional petroleum geology,review the latest theoretical and technological progress in unconventional petroleum geology,introduce relevant thinking and practices in China,and explore the pathway of unconventional petroleum revolution and multi-energy coordinated development in super energy basins,hopefully to promote the unconventional petroleum geology and industry development. | Caineng Zou Zhi Yang Guosheng Zhang Rukai Zhu Shizhen Tao Xuanjun Yuan Lianhua Hou Dazhong Dong Qiulin Guo Yan Song Qiquan Ran Zhen Qiu Songtao Wu Feng Ma Bin Bai Lan Wang Bo Xiong Songqi Pan Hanlin Liu Xiaoni Wang | 2023 | Journal of Earth Science2023，34，4： | 0 |
| 14 | A PIID-DTBT based semi-conducting polymer dots with broad and strong optical absorption in the visible-light region: Highly effective contrast agents for multiscale and multi-spectral photoacoustic imaging显示文摘作为一种混合成像技术, photoacoustic 成像(白族) 能提供纸巾的多尺度的词法信息,并且多光谱的白族(MSPAI ) 的使用能恢复兴趣的色基的空间分发,例如在纸巾以内的血红素。此处,我们开发了能很有效地为复杂生物纸巾的更全面的描述把多尺度的白族与 MSPAI 相结合的一个对比代理人。明确地,我们开发了新奇 PIID-DTBT 在可见光的区域(500-700 nm ) 显示出宽广、强壮的光吸收的基于的半导体的聚合物点(Pdots ) 。金 nanoparticles (GNP ) 和金 nanorods (GNR ) 的表演,作为优秀 photoacoustic 对比代理人被验证了,基于多尺度的白族系统与 Pdots 的相比。两前 vivo 并且在 vivo,实验比有在在一样的 700 nm 的 GNR 的 GNP 和显示出的类似的 photoacoustic 性能集中的证明 Pdots 在 532 nm 有更好的 photoacoustic 变换效率集中。Photostability 和毒性测试证明 Pdots 是 photostable 和 biocompatible。更重要地,一在里面 vivo MSPAI 实验显示 Pdots 比血有更好的 photoacoustic 性能,因此,信号能精确地从脉管富人的纸巾的背景被提取。我们的工作基于多尺度的白族和 MSPAI 相对血容器为损害的精确本地化作为高度有效的对比代理人表明 Pdots 的大潜力。 | Jian Zhang Haobin Chen Ting Zhou Limei Wang Duyang Gao Xuanjun Zhang Yubin Liu Changfeng Wu Zhen Yuan | 2017 | Nano Research2017，10，1： | 0 |
| 15 | Sequence structure, sedimentary evolution and their controlling factors of the Jurassic Lianggaoshan Formation in the East Sichuan Basin, SW China显示文摘Based on the data of outcrops, seismic sections, thin sections, heavy mineral assemblages and detrital zircon U-Pb dating, the sedimentary characteristics, lake level fluctuation and provenance characteristics of the Middle Jurassic Lianggaoshan Formation(J_(2)l) in eastern Sichuan Basin, SW China, were investigated to reveal the control of tectonic movements of the surrounding orogenic belts on the sedimentary systems. The J_(2)lmainly developed a delta–lake sedimentary system, which contained a complete third-order sequence that was subdivided into four lake level up-down cycles(fourth-order sequence).The lake basins of cycles Ⅰ and Ⅱ were mainly distributed in eastern Sichuan Basin, while the lake basins of cycles Ⅲ and Ⅳ migrated to central Sichuan Basin, resulting in the significant difference in sedimentary characteristics between the north and the south of eastern Sichuan Basin. The provenance analysis shows that there were three types of provenances for J_(2)l. Specifically, the parent rocks of Type Ⅰ were mainly acidic igneous rocks and from the proximal northern margin of the Yangtze Plate;the parent rocks of Type Ⅱ were intermediate-acid igneous rocks and metamorphic rocks and from the central parts of the southern and northern Qinling orogenic belts;the parent rocks of Type Ⅲ were mainly metamorphic rocks followed by intermediate–acid igneous rocks, and from the North Daba Mountain area. It is recognized from the changes of sedimentary system and provenance characteristics that the sedimentary evolution of J_(2)lin eastern Sichuan Basin was controlled by the tectonic compression of the Qinling orogenic belt. In the early stage, the lake basin was restricted to the east of the study area, and Type Ⅰ provenance was dominant. With the intensifying north-south compression of the Qinling orogenic belt, the lake basin expanded rapidly and migrated northward, and the supply of Type Ⅱ provenance increased. In the middle and late stages, the uplift of the North Daba Mountain led to the lake basin migration and the gradual increase in the supply of Type Ⅲ provenance. | CHENG Dawei ZHANG Zhijie HONG Haitao ZHANG Shaomin QIN Chunyu YUAN Xuanjun ZHANG Bin ZHOU Chuanmin DENG Qingjie | 2023 | Petroleum Exploration and Development2023，50，2： | 0 |
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