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Application of mapping and dating techniques in the study of ancient carbonate reservoirs: A case study of Sinian Qigebrak Formation in northwestern Tarim Basin, NW China

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Petroleum Exploration and Development 2020年第5期47卷 1001-1013页

作者： YANG Hanxuan HU Anping ZHENG Jianfeng LIANG feng LUO Xianying feng yuexing SHEN Anjiang PetroChina Hangzhou Research Institute of Geology(HIPG) Hangzhou 310023China Key Laboratory of Carbonate Reservoirs CNPCHangzhou 310023China Radiogenic Isotope Facility School of Earth and Environmental SciencesThe University of QueenslandBrisbaneQLD 4072Australia

Ancient marine carbonates experienced complex modifications,making it difficult to identify reservoir genesis and effective porosity before hydrocarbon *** solve these issues,we used element mapping and carbonate mineral laser U-Pb radiometric dating techniques to study the diagenetic environments based on geochemistry and diagenesis-porosity evolution based on geochronology of the dolomite reservoir of the Sinian Qigebrak Formation,northwest Tarim *** major understandings were obtained as follows:(1)Supported by petrographic observations,the element mapping,stable isotopes,strontium isotope,and cathodoluminescence tests were performed on different phases of dolomite cements precipitated in vugs and dissolved *** results show that the dolomite reservoirs of the Qigebrak Formation went through freshwater,marine,extremely shallow burial,burial and hydrothermal diagenetic environments after synsedimentary dolomitization;the reservoir spaces were mainly formed in the synsedimentary period(primary pores)and freshwater environment(supergene dissolution pores)before burial;whereas the marine,burial and hydrothermal environments caused the gradual filling of reservoir space by dolomite cements.(2)Based on the above understandings,each phase of dolomite cement precipitated in the reservoir space was dated by the U-Pb radiometric dating technique,and the diagenesis-porosity evolution curves constrained by geochronology were *** loss of reservoir porosity mainly occurred in the early Caledonian,and during the peak period of hydrocarbon generation of Yuertusi Formation source rock,the reservoirs still maintained at a porosity of 6%?10%.The above understandings provide a certain basis for the evaluation of accumulation effectiveness of the Sinian Qigebrak Formation,northwestern Tarim Basin,and provide a case for the application of mapping and dating techniques in the study of ancient carbonate reservoirs.

关键词： U-Pb dating mapping Sinian Qigebrak Formation northwestern Tarim Basin diagenetic environment diagenesis-porosity evolution

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Laser ablation in situ U-Pb dating and its application to diagenesis-porosity evolution of carbonate reservoirs

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Petroleum Exploration and Development 2019年第6期46卷 1127-1140页

作者： SHEN Anjiang HU Anping CHENG Ting LIANG feng PAN Wenqing feng yuexing ZHAO Jianxin Key Laboratory of Carbonate reservoirs CNPCXihu DistrictHangzhou 310023China PetroChina Hangzhou Research Institute of Geology(HIPG) Xihu DistrictHangzhou 310023China Radiogenic Isotope Facility School of Earth and Environmental SciencesThe University of QueenslandBrisbaneQLD 4072Australia Beijing SHRIMP Center Institute of GeologyChinese Academy of Geological Sciences(CAGS)Haidian DistrictBeijing 100037China Research Institute of Exploration and Development PetroChina Tarim OilfieldKorla 841000China

Through the development and calibration of a reference material which is 209.8 Ma old using a newly-developed Laser Ablation(LA)Multi-Collector Inductively Coupled Plasma Mass Spectrometry(MC-ICP-MS)technique,we successfully overcome the difficulty in sampling and dating ultra-low U-Pb ancient marine carbonates,which was previously untenable by isotope dilution(ID)*** developed the LA-MC-ICP-MS in situ U-Pb dating technique for ancient marine carbonates for the study of diagenesis-porosity evolution history in Sinian Dengying Formation,Sichuan *** systematically dating of dolomitic cements from vugs,matrix pores and fractures,we found that the burial and diagenetic process of dolomite reservoirs in Sinian Dengying Formation was characterized by progressive filling-up of primary pores and epigenic dissolution *** filling of vugs happened in three stages,early Caledonian,late Hercynian-Indosinian and Yanshanian-Himalayan,while the filling of matrix pores mainly took place in early *** unfilled residual vugs,pores and fractures constitute the main reservoir *** on the above knowledge,we established the diagenesis-porosity evolution history of the dolomite reservoir in Sinian Dengying Formation,Sichuan *** findings are highly consistent with the tectonic-burial and basin thermal histories of the study *** study confirmed the reliability of this in situ U-Pb dating technique,which provides an effective way for the investigation of diagenesis-porosity evolution history and evaluation of porosity in ancient marine carbonate reservoirs before hydrocarbon migration.

关键词： laser ablation in-situ U-Pb dating Sichuan Basin Sinian Dengying Formation diagenesis-porosity evolution carbonates

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Syn-Faulting Calcite Ages:Constraint for the Late Mesozoic Deformation of the Ningzhen Mountain,Eastern China

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Journal of Earth Science 2021年第6期32卷 1485-1495页

作者： Jinbao Su Hongbing Tan yuexing feng Guoxing Qin College of Oceanography Hohai UniversityNanjing210098China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China School of Earth Sciences The University of QueenslandBrisbaneQLD4072Australia

It is difficult to date a brittle fault because of the absence of effective dating ***,calcite U-Pb dating has drawn the attention of many researchers and has been successfully applied to constrain the age of brittle *** South China Block(SCB)has experienced multiphase deformations characterized by widespread brittle faults and folds,which has led to significant debate on the Mesozoic dynamic mechanism and deformational phases.A syn-faulting calcite vein that occurred in the Permian limestones of the Ningzhen Mountain region was analyzed using U-Pb dating and geochemistry techniques in this *** U-Pb dating results display multiphase activities with two mixed ages of 109.9±5.8 Ma(MSWD=46,n=231)and 117.2±2.4 Ma(MSWD=3.6,n=150).The age of 117.2±2.4 Ma likely represents the timing of the brittle *** elements and rare earth elements data indicate that these fault-related calcites are mainly derived from host limestones and unrelated to Cretaceous magmatic *** faults formed in a tectonic reactive period and dormant time of the adakitic magma in the Lower Yangtze region.

关键词： U-Pb dating calcite South China Block brittle fault adakitic rock

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Degree of Brine Evaporation and Origin of the Mengyejing Potash Deposit：Evidence from Fluid Inclusions in Halite

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 175-185页

作者： SHEN Lijian LIU Chenglin WANG Licheng HU Yufei HU Mingyue feng yuexing MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China National Research Center for Geoanalysis Beijing 100037 China Radiogenic Isotope Facility School of Earth Sciences the University of Queensland Brisbane 4072 QLDAustralia

The Mengyejing potash deposit is located in the southern port of the Simao Basin, Yunnan Province, and is hosted in mid-Cretaceous strata. The chemical compositions of fluid inclusions in halite crystals, collected from the level-610 adit in the deposit, were analysed by laser ablation inductively coupled plasma mass spectrometry（LA-ICP-MS）. The results show that the brine is of the Na-K-Mg-Ca-Cl type and has K concentrations that are distinctly higher than those of Mg and Ca, unlike normal brines associated with Cretaceous halite. The high K concentrations indicate that the degree of evaporation of the ancient Mengyejing saline lake was very high, reaching the sylvite deposition stage but rarely reaching the carnallite deposition stage. The trajectory of the H and O isotopic compositions of the brines in the halite-hosted fluid inclusions corresponds to intense evaporation, indicating that the net evaporation exceeded the net inflow of brines. These brine compositions in halite-hosted fluid inclusions were likely formed by the dissolution of previously deposited K-bearing minerals by fresh continental and/or seawater, forming a type of modified seawater, with deep hydrothermal fluids potentially supplying additional potassium. The basin likely experienced multiple seawater incursion, dissolution and redeposition events in a high-temperature environment with high evaporation rates.

关键词： Cretaceous halite fluid inclusions H and O isotopic compositions brine chemical compositions Mengyejing potash deposit Yunnan Province

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A Paleozoic mercury mineralisation event in South China:In situ U-Pb dating and chemical compositions of calcite from the Jianyan Hg deposit

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Science China Earth Sciences 2023年第8期66卷 1877-1891页

作者： Kai LUO Jiaxi ZHOU Alexandre CUGERONE Meifu ZHOU yuexing feng Zhongguo JIN Jianxin ZHAO Key Laboratory of Critical Minerals Metallogeny in Universities of Yunnan Province School of Earth SciencesYunnan UniversityKunming 650500China School of Earth and Environmental Sciences The University of QueenslandBrisbane QLD 4072Australia State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Department of Earth Sciences University of GenevaGeneva 1205Switzerland Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou Guiyang 550005China

The ages of hydrothermal Hg deposits are difficult to constrain because of the lack of suitable minerals for *** South China low-temperature metallogenic domain hosts numerous Hg deposits,including the Jianyan Hg deposit that is composed mainly of cinnabar and *** are two stages of calcite in the deposit:syn-ore calcite(Cal-Ⅰ)and post-ore/barren calcite(Cal-Ⅱ).Cal-Ⅰis mainly euhedral-subhedral and fine-grained,has homogeneous grey luminescence,and is associated with ***-anhedral Cal-Ⅱcrosscuts Cal-Ⅰand is relatively *** syn-ore Cal-Ⅰhas high U contents(0.1–1.3 ppm)and U/Pb ratios(up to 4.2),and is thus suitable for U-Pb *** a laser ablation-inductively coupled plasma-mass spectrometer equipped with ion counters,we obtained a U-Pb age of 426.3±5.7 Ma(MSWD=1.5)for *** age is interpreted to represent the timing of Hg mineralisation at Jianyan and is similar to ages of 440–400 Ma reported for many carbonate-hosted Pb-Zn and Ba-F deposits in South *** on the present results in combination with existing geochemical and geochronological data,we infer that these deposits belong to a Paleozoic Hg-Pb-Zn-Ba-F mineralisation system that was controlled by Caledonian tectonism.

关键词： In situ calcite U-Pb dating Paleozoic Hg mineralisation Caledonian tectonism Jianyan Hg deposit South China

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Testing coral paleothermometers(B/Ca, Mg/Ca, Sr/Ca, U/Ca and δ^(18)O) under impacts of large riverine runoff

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Acta Oceanologica Sinica 2015年第8期34卷 20-26页

作者： CHEN Tianran YU Kefu ZHAO Jianxin YAN Hongqiang SONG Yinxian feng yuexing CHEN Tegu Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Radiogenic Isotope Laboratory School of Earth Sciences The University of Queensland

Sea surface temperature （SST） proxies including B/Ca, Mg/Ca, St/Ca, U/Ca and δ180 were analyzed in the skeleton of a Porites coral collected from the Zhujiang River （Pearl River） Estuary （ZRE）. These geochemical proxies are influenced by river runoff and this area of the northern South China Sea is strongly affected by seasonal freshwater floods. We assessed the robustness of each SST proxy through comparison with the local instrumental SST. Coral St/Ca shows the highest correlation with SST variations （r2=0.59）, suggesting St/Ca is the most robust SST proxy. In contrast, coral δ180 （r2=0.46）, B/Ca （r2=0.43） and U/Ca （r2=0.41） ratios were only moderately correlated with SST variations, suggesting that they are disturbed by some other factors in addition to SST. The poor correlation （r2=0.27） between SST and Mg/Ca indicates that Mg/Ca in coral skeletons is not a simple function of SST variations. This may ultimately limit the use of Mg/Ca as a coral paleothermometer.

关键词： Porites coral SST proxies coral paleothermometers riverine runoff Zhujiang River (Pearl River) Estuary northern South China Sea

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Trace metal anomalies in bleached Porites coral at Meiji Reef, tropical South China Sea

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Chinese Journal of Oceanology and Limnology 2017年第1期35卷 115-121页

作者： LI Shu YU Kefu ZHAO Jianxin feng yuexing CHEN Tianran Key laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Radiogenic lsotope Laboratory School of Earth Sciences The University of Queensland Brisbane QLD 4072 Australia

Coral bleaching has generally been recognized as the main reason for tropical coral reef degradation, but there are few long-term records of coral bleaching events. In this study, trace metals including chromium(Cr), copper(Cu), molybdenum(Mo), manganese(Mn), lead(Pb), tin(Sn), titanium(Ti), vanadium(V), and yttrium(Y), were analyzed in two Porites corals collected from Meiji Reef in the tropical South China Sea(SCS) to assess differences in trace metal concentrations in bleached compared with unbleached coral growth bands. Ti, V, Cr, and Mo generally showed irregular fluctuations in both corals. Bleached layers contained high concentrations of Mn, Cu, Sn, and Pb. Unbleached layers showed moderately high concentrations of Mn and Cu only. The different distribution of trace metals in Porites may be attributable to different selectivity on the basis of vital utility or toxicity. Ti, V, Cr, and Mo are discriminated against by both coral polyps and zooxanthellae, but Mn, Cu, Sn, and Pb are accumulated by zooxanthellae and only Mn and Cu are accumulated by polyps as essential elements. The marked increase in Cu, Mn, Pb, and Sn are associated with bleaching processes, including mucus secretion, tissue retraction, and zooxanthellae expulsion and occlusion. Variation in these trace elements within the coral skeleton can be used as potential tracers of short-lived bleaching events.

关键词： trace metals Porites zooxanthellae coral bleaching Meiji Reef South China Sea

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LA-ICPMS in-situ U-Pb Geochronology of Low-Uranium Carbonate Minerals and Its Application to Reservoir Diagenetic Evolution Studies

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Journal of Earth Science 2021年第4期32卷 872-879页

作者： Entao Liu Jian-Xin Zhao Hua Wang Songqi Pan yuexing feng Qianglu Chen Faye Liu Jiasheng Xu State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590China Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan 430074China Radiogenic Isotope Facility School of Earth and Environmental Sciencesthe University of QueenslandBrisbane Qld 4072Australia PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China

Reconstruction of the diagenetic evolution of reservoirs is one of the most significant tasks in oil and gas exploration and *** the accurate timing of diagenetic events is critical to better understand the process of reservoir evolution,but the isotope dating of diagenetic events is technically *** paper uses three case studies in the sedimentary basins in China to demonstrate the promising application of recently developed LA-(MC)-ICPMS in-situ U-Pb *** results show that the new U-Pb dating method provides a reliable and efficient chronological approach to determine the absolute ages of diagenetic *** example,the U-Pb age data of the Cambrian carbonate reservoir in the Tarim Basin reveals three diagenetic events at 526±14,515±21,and 481±4.6 Ma,*** is worth noting that microscopic observations are particularly important for improving the success rate of U-Pb *** addition,the recent progress and future prospects in the in-situ U-Pb dating method are also discussed in this study,suggesting that this method is currently hindered by the lack of international carbonate standards for data correction.

关键词： LA-ICPMS U-Pb geochronology carbonate minerals diagenetic evolution reservoir sedimentary basin

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低铀碳酸盐矿物的LA-MC-ICPMS微区原位U-Pb定年方法

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科学通报 2020年第2期65卷 150-154页

作者：程婷 Jianxin Zhao yuexing feng 潘文庆刘敦一中国地质科学院地质研究所北京离子探针中心北京100037 Radiogenic Isotope Facility School of Earth and Environmental Sciencesthe University of QueenslandBrisbaneQld 4072Australia 中国石油塔里木油田公司库尔勒841000

碳酸盐矿物的同位素年代学研究具有广阔的应用前景,但理想样品少、定年难度大(尤其是低铀样品)等因素限制了该方法的发展.本研究利用激光剥蚀多接收电感耦合等离子体质谱技术(LA-MC-ICPMS),建立了针对低铀碳酸盐矿物的微区原位U-Pb同位... 详细信息

碳酸盐矿物的同位素年代学研究具有广阔的应用前景,但理想样品少、定年难度大(尤其是低铀样品)等因素限制了该方法的发展.本研究利用激光剥蚀多接收电感耦合等离子体质谱技术(LA-MC-ICPMS),建立了针对低铀碳酸盐矿物的微区原位U-Pb同位素定年方法.通过LA-ICPMS预扫描,可以快速筛选出适合定年的样品和最佳剥蚀点,再借助为实现低铀含量的精确测量而对接收器配置优化设计的Nu Plasma Ⅱ MC-ICPMS进行碳酸盐矿物的U-Pb年龄测定.此外,通过两种已报道的碳酸盐矿物标样ASH15和WC-1,标定出一种更加均一且适用对象更广的实验室内部标样AHX-1a,其与国际标样长期对比测量获得的年龄加权平均值为209.8±1.3Ma(2S总,n=21,MSWD=2.7).此年龄结果是在半年内不同时期对样品靶不同部位21次独立标定的年龄结果的加权平均值,每一次对测约有50~150组数据点,总共2000多组数据点.与此同时,为了继续寻找其他理想碳酸盐矿物标样,更进一步的同位素稀释法标定工作还有待开展.

关键词：碳酸盐矿物 U-Pb 年龄 LA-MC-ICPMS 矿物标样

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方解石原位U-Pb测年结合磷灰石裂变径迹方法约束鄂尔多斯盆地西南部构造演化

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石油与天然气地质 2021年第5期42卷 1189-1201页

作者：杨鹏任战利 Jianxin Zhao Ai Duc Nguyen yuexing feng 祁凯王琨页岩油气富集机理与有效开发国家重点实验室北京102206 中国石化油气成藏重点实验室江苏无锡214126 西北大学大陆动力学国家重点实验室陕西西安710069 西北大学地质学系陕西西安710069 Radiogenic Isotope Facility School of Earth and Environmental SciencesThe University of QueenslandBrisbaneQLD 4072Australia

鄂尔多斯盆地下古生界油气资源丰富,盆地西南部下古生界海相碳酸盐岩地层沉积厚度大、有机质丰度较高,烃源岩热演化达到过成熟生干气阶段,但是构造演化缺乏深入研究,早期构造事件具体时限是一个亟待解决的关键科学问题。在详细的野外调... 详细信息

鄂尔多斯盆地下古生界油气资源丰富,盆地西南部下古生界海相碳酸盐岩地层沉积厚度大、有机质丰度较高,烃源岩热演化达到过成熟生干气阶段,但是构造演化缺乏深入研究,早期构造事件具体时限是一个亟待解决的关键科学问题。在详细的野外调查、显微结构特征、原位微量元素分析和区域沉积-埋藏演化历史的约束下,结合下古生界碳酸盐岩地层及其断裂破碎带内次生方解石原位U-Pb测年与磷灰石裂变径迹时间-温度曲线模拟结果,揭示了鄂尔多斯盆地西南部晚奥陶世、晚三叠世、晚侏罗世和早白垩世末期—新生代以来的4期构造事件。结果表明研究区晚奥陶世(452±13)Ma存在一期热液改造事件,可能与加里东期原特提斯洋俯冲闭合密切相关;印支期(214±22)Ma的断裂活动是引起区域构造-热事件的重要原因,印支期构造事件规模有限;燕山期和喜马拉雅期构造活动强烈,造成鄂尔多斯盆地西南部大幅度隆升和强烈剥蚀。盆地西南部多阶段复杂的构造演化历史导致油气保存条件破坏严重,对寻找古生界天然气藏不利,应重视盆地天然气保存条件的研究。研究结果对鄂尔多斯盆地古生界油气勘探工作有重要指导意义。将低温热年代学与断裂带方解石原位U-Pb定年相结合分析构造演化的新思路,为解析复杂叠合盆地盆缘带构造演化及其后期改造过程的研究提供了新途径。

关键词：方解石U-Pb定年裂变径迹构造演化下古生界鄂尔多斯盆地

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