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Thermal and exhumation history of the Songnan Low Uplift,Qiongdongnan Basin:constraints from the apatite fission-track and zircon(U-Th)/He thermochronology

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Acta Oceanologica Sinica 2024年第4期43卷 40-49页

作者： Xiaoyin Tang Kaixun Zhang shuchun yang Shuai Guo Xinyan Zhao Zhizhao Bai Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China Key Laboratory of Petroleum Geomechanics China Geological SurveyBeijing 100081China China National Offshore Oil Corporation(CNOOC)Research Center Beijing 100028China

Significant advancements have been made in the study of Mesozoic granite buried hills in the Songnan Low Uplift(SNLU)of the Qiongdongnan *** findings indicate that the bedrock buried hills in this basin hold great potential for *** samples taken from the granite buried hills in the SNLU were analyzed using apatite fission track(AFT)and zircon(U-Th)/He data to unravel the thermal history of the basement *** information is crucial for understanding the processes of exhumation and alteration that occurred after its *** modeling of a sample from the western bulge of the SNLU revealed a prolonged cooling event from the late Mesozoic to the Oligocene period(~80-23.8 Ma),followed by a heating stage from the Miocene epoch until the present(~23.8 Ma to present).In contrast,the sample from the eastern bulge experienced a more complex thermal *** underwent two cooling stages during the late Mesozoic to late Eocene period(~80-36.4 Ma)and the late Oligocene period(~30-23.8 Ma),interspersed with two heating phases during the late Eocene to early Oligocene period(~36.4-30 Ma)and the Miocene epoch to recent times(~23.8-0 Ma),*** differences in exhumation histories between the western and eastern bulges during the late Eocene to Oligocene period in the SNLU can likely be attributed to differences in fault *** typical passive continental margin basins,the SNLU has experienced accelerated subsidence after the rifting phase,which began around 5.2 Ma *** possible mechanism for this abnormal post-rifting subsidence may be the decay or movement of the deep thermal source and the rapid cooling of the ***-term and multi-episodic cooling and exhumation processes play a key role in the alteration of bedrock and contribute to the formation of *** the other hand,rapid post-rifting subsidence(sedimentation)promotes the formation of cap rocks.

关键词： granite buried hills (U-Th)/He dating fission-track dating exhumation Songnan Low Uplift

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Application of C_(30)tetracyclic polyprenoids as effective biomarker in oil-to source rock correlation in the ZhuⅢdepression,Zhujiangkou Basin,northern South China

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Acta Oceanologica Sinica 2024年第8期43卷 37-46页

作者： Lei Lan Youchuan Li shuchun yang yang Ouyang Wenjing Ding Qing Lin Shanshan Zhou CNOOC Research Institute Co. Ltd.Beijing 100028China

The northern South China Sea,including the Zhujiangkou Basin and the Beibuwan Basin,developed high-quality lacustrine source rocks during the Eocene rifting *** source rocks are vital for hydrocarbon generation in the northern South China *** ZhuⅠdepression in the Zhujiangkou Basin and the Beibuwan Basin typically exhibit high abundance of C_(30)4-methyl ***,shales in the Eocene Wenchang Formation in the ZhuⅢdepression of the Zhujiangkou Basin contains lower quantities of high-quality lacustrine source rocks with 4-methyl steranes,which often co-elute with some pentacyclic triterpanes in gas chromatography-mass spectrometry(GC-MS).Therefore,the single 4-methylsterane parameter based on GC-MS cannot accurately distinguish organic source in the deep to semi-deep water lacustrine source rocks of the Wenchang Formation from other source rocks,thus impeding the recognition of their contributions to petroleum *** this study,GC-MS of aliphatic hydrocarbons,palynofacies and algal identification,as well as stable carbon isotope data of organic matter were used to identify the algal species and construct the paleoclimate during deposition of the Wenchang Formation source rocks in the ZhuⅢdepression of the Zhujiangkou *** is suggested that during the Wenchang Formation period,freshwater green algae prevailed in the lake,which is likely account for the relatively low content of 4-methyl steranes in the high-quality lacustrine source *** by the algal species,it is proposed that the content of C_(30)tetracyclic polyprenoids(TPP)can better indicate the quality of the Wenchang source rocks than C_(30)4-methyl ***,a relationship between the TPP index and the quality of the lacustrine source rocks in the Wenchang Formation of the ZhuⅢdepression was established.A higher TPP index indicates higher organic matter abundance and hydrogen index of the lacustrine source *** applied to the origin analysis of oils

关键词： lacustrine source rocks C_(30)tetracyclic polyprenoids green algae Zhujiangkou Basin

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渤海湾盆地烃源岩有机-无机相互作用对生烃的影响

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同济大学学报（自然科学版） 2024年第1期52卷 137-144页

作者：李威李友川郭刚杨树春中海油研究总院有限责任公司北京100028

以渤中19-6气田为例,以烃源岩为研究对象,开展有机-无机相互关系研究,厘清渤中19-6构造带烃源岩特征及有机-无机相互作用对生烃成气的影响。30余口井泥岩样的有机地球化学、无机地球化学、古生物等分析结果表明,渤中19-6构造带及周缘次... 详细信息

以渤中19-6气田为例,以烃源岩为研究对象,开展有机-无机相互关系研究,厘清渤中19-6构造带烃源岩特征及有机-无机相互作用对生烃成气的影响。30余口井泥岩样的有机地球化学、无机地球化学、古生物等分析结果表明,渤中19-6构造带及周缘次洼古生物以被子类和裸子类高等植物为主,形成了以腐殖型无定形体占绝对优势的Ⅱ2型烃源岩;渤中19-6构造带黏土矿中伊利石占绝对优势,在黏土矿表面通过物理吸附和化学键作用富集了大量腐殖型无定形体并经加氢改造,后期在伊利石的影响下,烃源岩主要发生脱羧反应,热裂解形成大量短链烃类,产烃量大大增加,进而富集形成现今凝析油气广泛分布的特征。

关键词：渤中凹陷烃源岩类型伊利石有机-无机相互作用

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渤海盆地秦南凹陷新生代以来构造-热演化史

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地质力学学报 2024年第4期30卷 622-632页

作者：高玉飞唐晓音杨树春赵欣妍胡圣标中海油研究总院北京100027 中国地质科学院地质力学研究所北京100081 自然资源部古地磁与古构造重建重点实验室北京100081 中国地质调查局油气地质力学重点实验室北京100081 中国科学院地质与地球物理研究所北京100029

构造-热演化史是认识盆地形成及其动力学机制的重要窗口,也是烃源岩成熟生烃研究的核心问题。随着能源需求的增长以及陆地油气发现难度的增加,海域逐渐成为中国油气勘探的重要接替区与国家能源战略研究的重要领域。秦南凹陷位于渤海海... 详细信息

构造-热演化史是认识盆地形成及其动力学机制的重要窗口,也是烃源岩成熟生烃研究的核心问题。随着能源需求的增长以及陆地油气发现难度的增加,海域逐渐成为中国油气勘探的重要接替区与国家能源战略研究的重要领域。秦南凹陷位于渤海海域西北部,勘探前景良好,但勘探程度低,构造-热演化研究尚属空白。文章选取秦南凹陷3条地震剖面,建立25口人工井,进行了构造沉降史和热史模拟,恢复了秦南凹陷构造-热演化历史。研究结果表明:秦南凹陷新生代以来于孔店组—沙河街组四段沉积时期(65~42 Ma)、沙河街组三段沉积时期(42~38 Ma)以及东营组三段沉积时期(32.8~30.3 Ma)分别经历了3期裂陷拉张,总拉张系数为1.27~2.05;对应这3期拉张作用,秦南凹陷基底热流经历3期升高,在东营组三段沉积末期(30.3 Ma)基底热流达到峰值64.0~89.0 mW/m^(2),之后逐渐降低至今;秦南凹陷构造-热演化过程与断裂活动具有良好的耦合关系。研究获得的拉张系数、基底热流等参数对于了解渤海盆地构造演化的深部动力学机制以及指导研究区油气勘探具有重要意义。

关键词：渤海盆地秦南凹陷构造沉降热史演化新生代

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Thermal-history reconstruction of the Baiyun Sag in the deep-water area of the Pearl River Mouth Basin, northern South China Sea

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Frontiers of Earth Science 2018年第3期12卷 532-544页

作者： Xiaoyin TANG shuchun yang Shengbiao HU Geothermal and Environmental Research Laboratory Xi'an Jiaotong University Xi'an 710049 China CNOOC Research Institute Beijing 100027 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

The Baiyun Sag, located in the deep-water area of the northern South China Sea, is the largest and deepest subbasin in the Pearl River Mouth Basin and one of the most important hydrocarbon-accumulation depression areas in China. Thermal history is widely thought to be of great importance in oil and gas potential assessment of a basin as it controls the timing of hydrocarbon generation and expulsion from the source rock. In order to unravel the paleo-heat flow of the Baiyun Sag, we first analyzed tectonic subsidence of 55 pseudo-wells constructed based on newly interpreted seismic profiles, along with three drilled wells. We then carried out thermal modeling using the multi-stage finite stretching method and calibrated the results using collected present-day vitrinite reflectance data and temperature data. Results indicate that the first and second heating of the Baiyun Sag after 49 Ma ceased at 33.9 Ma and 23 Ma. Reconstructed average basal paleo- heat flow values at the end of the rifting periods are -57.7- 86.2 mW/m2 and -66.7-97.3 mW/m2, respectively. Following the last heating period at 23 Ma, the study area has undergone a persistent thermal attenuation phase, and basal heat flow has cooled down to ～64.0-79.2 mW/m2 at present.

关键词： thermal history tectonic subsidence Baiyun Sag deep-water area South China Sea

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Zircon U-Pb geochronology,Hf isotopes,and geochemistry constraints on the age and tectonic affinity of the basement granitoids from the Qiongdongnan Basin,northern South China Sea

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Acta Oceanologica Sinica 2023年第3期42卷 19-30页

作者： Lijun Mi Xiaoyin Tang Haizhang yang shuchun yang Shuai Guo China National Offshore Oil Corporation(CNOOC)Research Center Beijing 100028China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China Key Laboratory of Petroleum Geomechanics China Geological SurveyBeijing 100081China

Studies in the northern South China Sea(SCS)basement remain important for understanding the evolution of the Southeast Asian continental *** to a thick cover of sediments and scarce borehole penetration,little is known about the age and tectonic affinity of this *** this study,an integrated study of zircon U-Pb geochronology,Hf isotopes,and whole-rock major and trace elements on seven basement granitoids from seven boreholes of Qiongdongnan Basin has been carried *** zircon U-Pb results for these granitoids present middle-late Permian((270.0±1.2)Ma;(253±3.4)Ma),middle to late Triassic((246.2±3.4)Ma;(239.3±0.96)Ma;(237.9±0.99)Ma;(228.9±1.0)Ma)and Late Cretaceous ages((120.6±0.6)Ma).New data from this study,in combination with the previous dataset,indicates that granitoid ages in northern SCS basement vary from 270 Ma to 70.5 Ma,with three age groups of 270–196 Ma,162–142 Ma,and 137–71 Ma,*** for the late Paleozoic-Mesozoic rocks in the basement of the northern SCS,a few old zircon grains with the age of(2708.1±17)Ma to(2166.6±19)Ma provide clues to the existence of the pre-Proterozoic *** geochemical signatures indicate that the middle Permian-early Cretaceous granitoids from the Qiongdongnan Basin are I-type granites formed in a volcanic arc environment,which were probably related to the subduction of the Paleo-Pacific Plate.

关键词： Qiongdongnan Basin basement granitoids geochemistry U-Pb and Hf isotopes Paleo-Pacific Plate subduction

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Biomarkers reveal the terrigenous organic matter enrichment in the late Oligocene-early Miocene marine shales in the Ying-Qiong Basin,South China Sea

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Acta Oceanologica Sinica 2023年第3期42卷 31-53页

作者： Wenjing Ding Youchuan Li Lan Lei Li Li shuchun yang Yongcai yang Dujie Hou China National Offshors Oil Corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China School of Natural Sciences Macquarie UniversitySydney 2109Australia School of Energy Resources China University of GeosciencesBeijing 100083China CNOOC International Limited Beijing 100028China

The increase of total organic carbon content of the late Oligocene-early Miocene terrigenously-dominated marine shales in the shallower depth intervals was reported in the Ying-Qiong Basin,South China *** organic enriched lower Sanya Formation shales(early Miocene)have biomarker characteristics of tropical/subtropical plants,with abundant high molecular weight n-alkanes,angiosperm-derived oleanane,rearranged oleananesⅠ,Ⅱ,Ⅱ,tricyclic/tetracyclic terpanes including des-A-oleanane,X,*,Y,Z,Z1 and bicadinanes W,T,T1,*** biomarker characteristics are suggestive of larger influx of the dominant tropical/subtropical angiosperms in flora under a warming and more humid climate during depositions of the lower Sanya Formation(early Miocene)than the older Lingshui Formation(late Oligocene).The tropical/subtropical angiosperm input was thought as the prime control of terrigenous organic matter enrichment relative to the redox condition,and the coeval sea level changes and seafloor spreading in the South China *** of the terrigenous organic matter in the early Miocene shales is likely in association with the coeval peak East Asian summer monsoon intensity in the South China Sea.

关键词： total organic carbon higher plant-derived biomarkers tropical/subtropical plants East Asian monsoonal climate

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上海城区大气OH自由基反应活性的连续测量及其组成解析

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环境科学学报 2024年第9期44卷 103-114页

作者：杨舒春周文鑫黄聪艳吴宇航景盛翱周俊袁斌楼晟荣暨南大学环境与气候研究院广州511443 粤港澳环境质量协同创新联合实验室广州511443 上海环境科学研究院国家环境保护城市大气复合污染成因与防治重点实验室上海200233 上海理工大学能源与动力工程学院上海200093

OH自由基反应活性(k_(OH))是判断大气氧化性的重要指标之一.本研究采用基于激光光解-激光诱导荧光技术(LP-LIF)的k_(OH)测量系统,于2023年春夏季在上海城区进行了k_(OH)测量,并同步测量无机痕量气体、甲烷以及挥发性有机物(VOCs)以探究k... 详细信息

OH自由基反应活性(k_(OH))是判断大气氧化性的重要指标之一.本研究采用基于激光光解-激光诱导荧光技术(LP-LIF)的k_(OH)测量系统,于2023年春夏季在上海城区进行了k_(OH)测量,并同步测量无机痕量气体、甲烷以及挥发性有机物(VOCs)以探究k_(OH)变化特征及主要组成成分,并分析活性缺失的可能来源.研究结果表明,观测期间OH自由基反应活性平均测量值为13.1 s^(-1),日变化特征显著,平均存在27%的活性缺失.无机化合物和一次排放的VOCs对k_(OH)的贡献较大,其次是以甲醛和乙醛作为优势物种的含氧挥发性有机物(OVOCs),贡献占比最高可达到17.9%.通过结合光化学盒子模型,发现未测量的OVOCs物种是造成活性缺失的主要物种,其中乙二醛和甲基乙二醛占据k_(OH)模拟值的11.5%~12.5%.同时利用多元线性回归模型对4月和6月的活性缺失来源进行探究后,发现工业排放及溶剂使用对活性缺失的影响显著,影响占比分别为50.62%和29.1%.

关键词： OH自由基反应活性激光闪光光解-激光诱导荧光技术活性缺失挥发性有机物大气氧化性

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The influence of organic sources and environments on source rock deposition during the periods of Cretaceous–Eocene and Oligocene–Miocene,northern Kalimantan

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Acta Oceanologica Sinica 2023年第3期42卷 54-64页

作者： Lei Lan Youchuan Li Zhigang Zhao shuchun yang Qing Lin Weilai Zhang China National Offshore Oil Corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and Environment China University of PetroleumBeijing 102249China

The sedimentary system of Kalimantan has undergone significant development since the *** research have largely ignored the capacity of the Cretaceous–Eocene sediments to produce hydrocarbons,focusing instead primarily on the Oligocene–Miocene coal as the principal source *** and coals from the outcrops in the northern margin of Kalimantan were analyzed with palynological and geochemical methods to characterize the palaeoenvironmental and palaeoecological differences between the Cretaceous–Eocene and the Oligocene–Miocene *** high proportion of Cheirolepidoaceae,Schizaeoisporites and Ephedripites in the pollen assemblage from the Cretaceous–Eocene outcrops reflects an arid tropical/subtropical *** relatively low abundances of gymnosperm-derived biomarkers including isopimarane,β-phyllocladane,β-kaurane,suggest the gymnosperm features in *** C_(27)/C_(29)ααα20R sterane ratios,(C_(19)–C_(29))tricyclic terpanes/C_(30)αβhopane and extremely low oleanane/C_(30)αβhopane,bicadinane T/C_(30)αβhopane,and diterpenoid abundance indicate that there was a dominance of algae relative to higher plants in the organic *** gymnosperm-derived biomarkers,including isopimarane,β-phyllocladane,β-kaurane,suggest that palaeovegetation during this period was dominated by *** saline and reducing conditions in the bathyal and abysmal sea,evidenced by rather low Pr/Ph and high Gammarerane index,are beneficial for the preservation of hydrogen-rich organic *** is presumed that the Cretaceous–Eocene shales had great hydrocarbon generation potential in the southern South China *** the period of Oligocene to Miocene in the Zengmu Basin and the Baram-Sabah Basin,the climate changed to a dominant humid and warm condition,which is corroborated by abundant pollen of Florschuetzia and Magnastriatites *** C_(27)/C_(29)ααα20R sterane ratios,(C_(19)–C_(29))tricyclic terpanes/C_(30)αβhopane,and high oleanane/C_(30)αβhopane

关键词： biomarkers source rocks palynological records palaeoclimate South China Sea

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Tectono-thermal evolution of the Liwan Sag, deepwater area in the Zhujiang River Mouth Basin, northern South China Sea

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Acta Oceanologica Sinica 2018年第2期37卷 66-75页

作者： TANG Xiaoyin HUANG Shaopeng yang shuchun JIANG Guangzheng JI Mo HU Shengbiao Geothermal and Environmental Research Laboratory Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100049 China CNOOC Research Institute Beijing 100027 China

The Liwan Sag, with an area of 4 000 km-2, is one of the deepwater sags in the Zhujiang River（Pearl River） Mouth Basin, northern South China Sea. Inspired by the exploration success in oil and gas resources in the deepwater sags worldwide, we conducted the thermal modeling to investigate the tectono-thermal history of the Liwan Sag,which has been widely thought to be important to understand tectonic activities as well as hydrocarbon potential of a basin. Using the multi-stage finite stretching model, the tectonic subsidence history and the thermal history have been obtained for 12 artificial wells, which were constructed on basis of one seismic profile newly acquired in the study area. Two stages of rifting during the time periods of 49–33.9 Ma and 33.9–23 Ma can be recognized from the tectonic subsidence pattern, and there are two phases of heating processes corresponding to the *** reconstructed average basal paleo-heat flow values at the end of the rifting events are -70.5 and -94.2 mW/m^2 respectively. Following the heating periods, the study area has undergone a persistent thermal attenuation phase since 23 Ma and the basal heat flow cooled down to -71.8–82.5 mW/m^2 at present.

关键词： tectono-thermal evolution thermal history heat flow deepwater area Liwan Sag

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