In the South Yellow Sea Basin,Mesozoic–Paleozoic marine strata are generally well developed with large thickness,and no substantial breakthroughs have been made in hydrocarbon exploration.Through research,it is belie...In the South Yellow Sea Basin,Mesozoic–Paleozoic marine strata are generally well developed with large thickness,and no substantial breakthroughs have been made in hydrocarbon exploration.Through research,it is believed that the Upper Permian–Lower Triassic can be regarded as a long-term base-level cycle.Based on drilling data,characteristics of the lithology–electric property combination cyclicity,and the special lithology,the long-term base-level cycle was divided into five medium-term base-level cycles(MC1–MC5).On this basis,the Permian–Triassic sedimentary systems and their filling model were analyzed in accordance with the change of base-level cycle and transition of sedimentary environment,as well as characteristics of the drilling sedimentary facies and seismic facies.The results show that there were six sedimentary systems(fluvial,delta,tidal flat,open platform,restricted platform,and continental shelf)developed in the Upper Permian–Lower Triassic,the sedimentary systems were distributed such that the water was deep in the northwest and shallow in the southeast,and there were two base-level cycle filling models(a relatively stable tidal flat facies and a rapidly transgressive continental shelf facies to stable platform facies)developed in the Upper Permian–Lower Triassic.These models can provide a basis for evaluation of the Mesozoic–Paleozoic hydrocarbon geology in the South Yellow Sea Basin.展开更多
This paper deals with the hydrographic condition and variability in the Yellow Sea and East China Seas during winter. It is based on data obtained from the joint Chinese(Norwegian surveys during the period 1984 to 199...This paper deals with the hydrographic condition and variability in the Yellow Sea and East China Seas during winter. It is based on data obtained from the joint Chinese(Norwegian surveys during the period 1984 to 1995. The results indicated that:(1) From November to March, the water temperature there was decreasing, the Yellow Sea Cold Water, the Yellow Sea Warm Current and Yellow Sea Coastal Current mainly dominated the survey areas;(2) The vertical distribution of hydrographic factors varied through the winter. From November to March the thickness of upper homogeneous layer became thicker and the thermocline, halocline and Yellow Sea Cold Water less pronounced, in January March, these features disappeared and the hydrographic conditions were almost homogenous through the whole water column from surface to bottom;(3) The Yellow Sea Cold Water mass and Yellow Sea Warm Current showed strong clear inter annual variation. The temperature and salinity of Yellow Sea Cold Water were more stable. However, its relative volume in the stronger year(November, 1986) was 4 44 times that in the weaker year(Novemner, 1985). The Yellow Sea Warm Current’s speed in the stronger year(January, 1986) was 1.21 times that in the weaker year(January, 1992);(4) Anchovy was mainly distributed in the warm or cold water tongue areas formed by Yellow Sea Warm Current or Yellow Sea Coastal Current with temperature of 11 13℃.The thermocline had apparent effects on their vertical migration and they tended to stay above it most of the day.展开更多
【目的】陆架—边缘海作为海陆相互作用的关键区域,其沉积物蕴含着气候、海平面变化、生物地球化学循环和人类活动等重要信息。探讨末次冰消期以来沉积环境演化背景下南黄海中部泥质区有机碳埋藏的阶段性特征和影响因素具有重要意义。...【目的】陆架—边缘海作为海陆相互作用的关键区域,其沉积物蕴含着气候、海平面变化、生物地球化学循环和人类活动等重要信息。探讨末次冰消期以来沉积环境演化背景下南黄海中部泥质区有机碳埋藏的阶段性特征和影响因素具有重要意义。【方法】对取自该区东侧的H12岩心进行了AMS^(14)C测年、粒度、总有机碳(TOC)、总氮(TN)及稳定碳同位素(δ^(13)C)进行分析。【结果】相对低海平面时期(17~12.6 ka B.P.)发育硬质黏土层,TOC埋藏通量较高,以陆源有机质输入为主。海侵期(12.6~7.8 ka B.P.)受潮流侵蚀等动力作用影响,TOC来源为海陆混合源,陆源TOC埋藏通量在8 ka B.P.左右出现明显高值,对应沉积速率显著升高,可能反映季风驱动下沉积物供应和输送方式变化;高海平面时期(7.8 ka B.P.以来)以海源贡献为主;其中,5~2 ka B.P.,TOC含量在百年尺度上变化幅度较大,与黑潮强度减弱的阶段基本一致,TOC含量的高值整体对应于东亚冬季风的强盛期,可能反映冬季风驱动下黄海暖流的增强导致海洋初级生产力、水体环境的变化,进而对TOC埋藏的影响;~2 ka B.P.以来TOC变化幅度减小,海源有机质贡献整体增加,可能与ENSO(厄尔尼诺—南方涛动)活动的加强有关。【结论】海平面变化是末次冰消期以来南黄海中部有机碳埋藏演化的主控因素,而高海面以来TOC沉积记录阶段性变化可能跟东亚冬季风等影响下黄海暖流的变化及ENSO活动有关。展开更多
基金Projects(41506080,41702162)supported by the National Natural Science Foundation of ChinaProjects(DD20160152,DD20160147,GZH200800503)supported by China Geological Survey+1 种基金Projects(XQ-2005-01,2009GYXQ10)supported by China Ministry of Land and ResourcesProject(201602004)supported by the Postdoctoral Innovation Foundation of Shandong Province,China
文摘In the South Yellow Sea Basin,Mesozoic–Paleozoic marine strata are generally well developed with large thickness,and no substantial breakthroughs have been made in hydrocarbon exploration.Through research,it is believed that the Upper Permian–Lower Triassic can be regarded as a long-term base-level cycle.Based on drilling data,characteristics of the lithology–electric property combination cyclicity,and the special lithology,the long-term base-level cycle was divided into five medium-term base-level cycles(MC1–MC5).On this basis,the Permian–Triassic sedimentary systems and their filling model were analyzed in accordance with the change of base-level cycle and transition of sedimentary environment,as well as characteristics of the drilling sedimentary facies and seismic facies.The results show that there were six sedimentary systems(fluvial,delta,tidal flat,open platform,restricted platform,and continental shelf)developed in the Upper Permian–Lower Triassic,the sedimentary systems were distributed such that the water was deep in the northwest and shallow in the southeast,and there were two base-level cycle filling models(a relatively stable tidal flat facies and a rapidly transgressive continental shelf facies to stable platform facies)developed in the Upper Permian–Lower Triassic.These models can provide a basis for evaluation of the Mesozoic–Paleozoic hydrocarbon geology in the South Yellow Sea Basin.
文摘This paper deals with the hydrographic condition and variability in the Yellow Sea and East China Seas during winter. It is based on data obtained from the joint Chinese(Norwegian surveys during the period 1984 to 1995. The results indicated that:(1) From November to March, the water temperature there was decreasing, the Yellow Sea Cold Water, the Yellow Sea Warm Current and Yellow Sea Coastal Current mainly dominated the survey areas;(2) The vertical distribution of hydrographic factors varied through the winter. From November to March the thickness of upper homogeneous layer became thicker and the thermocline, halocline and Yellow Sea Cold Water less pronounced, in January March, these features disappeared and the hydrographic conditions were almost homogenous through the whole water column from surface to bottom;(3) The Yellow Sea Cold Water mass and Yellow Sea Warm Current showed strong clear inter annual variation. The temperature and salinity of Yellow Sea Cold Water were more stable. However, its relative volume in the stronger year(November, 1986) was 4 44 times that in the weaker year(Novemner, 1985). The Yellow Sea Warm Current’s speed in the stronger year(January, 1986) was 1.21 times that in the weaker year(January, 1992);(4) Anchovy was mainly distributed in the warm or cold water tongue areas formed by Yellow Sea Warm Current or Yellow Sea Coastal Current with temperature of 11 13℃.The thermocline had apparent effects on their vertical migration and they tended to stay above it most of the day.
文摘【目的】陆架—边缘海作为海陆相互作用的关键区域,其沉积物蕴含着气候、海平面变化、生物地球化学循环和人类活动等重要信息。探讨末次冰消期以来沉积环境演化背景下南黄海中部泥质区有机碳埋藏的阶段性特征和影响因素具有重要意义。【方法】对取自该区东侧的H12岩心进行了AMS^(14)C测年、粒度、总有机碳(TOC)、总氮(TN)及稳定碳同位素(δ^(13)C)进行分析。【结果】相对低海平面时期(17~12.6 ka B.P.)发育硬质黏土层,TOC埋藏通量较高,以陆源有机质输入为主。海侵期(12.6~7.8 ka B.P.)受潮流侵蚀等动力作用影响,TOC来源为海陆混合源,陆源TOC埋藏通量在8 ka B.P.左右出现明显高值,对应沉积速率显著升高,可能反映季风驱动下沉积物供应和输送方式变化;高海平面时期(7.8 ka B.P.以来)以海源贡献为主;其中,5~2 ka B.P.,TOC含量在百年尺度上变化幅度较大,与黑潮强度减弱的阶段基本一致,TOC含量的高值整体对应于东亚冬季风的强盛期,可能反映冬季风驱动下黄海暖流的增强导致海洋初级生产力、水体环境的变化,进而对TOC埋藏的影响;~2 ka B.P.以来TOC变化幅度减小,海源有机质贡献整体增加,可能与ENSO(厄尔尼诺—南方涛动)活动的加强有关。【结论】海平面变化是末次冰消期以来南黄海中部有机碳埋藏演化的主控因素,而高海面以来TOC沉积记录阶段性变化可能跟东亚冬季风等影响下黄海暖流的变化及ENSO活动有关。
文摘南黄海盆地构造层由陆相中、新生界和震旦系至中、下三叠统(青龙灰岩)海相碳酸盐岩沉积层构成,高速碳酸盐岩地层对地震波形成强屏蔽作用,导致地震反射成像不清晰,因而目前对南黄海中-古生界海相地层发育特征和结构认识还存在分歧.本文利用海洋可控源电磁(CSEM)探测技术对南黄海中部隆起区海相碳酸盐岩地层进行电阻率成像,分析与海水运动相关的电磁噪声特征,探讨海水运动对观测系统的影响.研究结果显示由海水运动造成的发射源方位变化可以解释电磁场振幅曲线的震荡现象.通过海洋CSEM数据二维反演获得了研究区电阻率结构,电阻率结构和地震反射剖面具有一致性,浅部低阻与第四系和新近系未固结沉积层以及破碎带的分布具有较好的对应关系;深部高阻可能揭示了海相碳酸岩盐地层的分布,结合地震、测井和电阻率反演结果,推测海相碳酸盐岩厚度超过6 km.
