松南海坨子—大布苏地区泉四段— 姚家组层序地层研究   总被引：2，自引：1，他引：1  

张永旺  曾溅辉  邓宏文  王红亮  高霞  陈冬  徐志伟 《沉积学报》2008,26(5):737-743

根据工区内现有的钻井、测井和地震资料,应用以多级次基准面旋回为参照面的高分辨层序地层学理论与研究方法,对松辽盆地南部海坨子—大布苏地区的泉四段—姚家组地层进行了详细的层序地层研究,共识别出5个长期基准面旋回（相当于三级层序）,9个中期基准面旋回（相当于四级层序）,建立了研究区的层序划分方案,在连井剖面的层序地层对比基础上,建立了该区的地层格架,并对层序构成特征进行了分析,研究了储集层在层序格架内的分布规律,揭示出浊积砂体和三角洲前缘相的分流河道形成于基准面上升期,三角洲前缘相的河口坝、远砂坝和席状砂沉积形成于基准面下降期,指出浊积砂体和三角洲前缘相的远砂坝、席状砂沉积是研究区形成岩性油气藏的有利储集体。  相似文献   

西沙群岛红藻研究Ⅲ     

张峻甫  夏邦美 《海洋科学集刊》1980,(17):49-70

本文继续报道我国西沙群岛产的十种红藻，其中梨形葡萄藻[Botryocladia pyriformis (Boergesen) Kylin]，聚集腔节藻(Coelarthrum coactum Okam. et Segawa)，渐狭下舌藻(Hypoglossum attenuatum Gardner)，棍棒内管藻[Endosiphonia clavigera (Wolny) Falkenberg],匍甸软骨藻(Chondria repens Boergesen)和扩展软骨藻(Chondria expansa Okam.)等六种为我国新记录；西沙软骨藻(Chondria xishaensis sp. nov.)为一新种;矮孔果藻和梨形葡萄藻的四分孢子囊均为首次记述。  相似文献   

Constraining the origin and evolution of confined turbidite systems: southern Cretan margin,Eastern Mediterranean Sea (34°30–36°N)     

Tiago M. Alves  Vasilios Lykousis  Dimitris Sakellariou  Stamatina Alexandri  Paraskevi Nomikou 《Geo-Marine Letters》2007,27(1):41-61

Bathymetric, 9.5-kHz long-range sidescan sonar (OKEAN), seismic reflection and sediment-core data are used in the analysis of two tectonic troughs south of Crete, Eastern Mediterranean Sea. Here, up to 1.2 s two-way travel time (TWTT) of strata have accumulated since the Middle Miocene in association with extension in the South Aegean region. The study area comprises >100-km- long by >25-km-wide basins filled by sediments subdivided into two seismic units: (1) an upper Unit 1 deposited in sub-basins which follow the present-day configuration of the southern Cretan margin; (2) a basal Unit 2, more than 500 ms (TWTT) thick, accumulated in deeper half-graben/grabens distinct from the present-day depocentres. Both units overlap a locally stratified Unit 3 comprising the pre-Neogene core complex of Crete and Gavdos. In this work, the interpreted seismic units are correlated with the onshore stratigraphy, demonstrating that denudation processes occurring on Crete and Gavdos in response to major tectonic events have been responsible for high sedimentation rates along the proximal southern Cretan margin. Consequently, topographically confined sedimentary units have been deposited south of Crete in the last 12 Ma, including turbidites and other mass-flow deposits fed by evolving transverse and axial channel systems. Surface processes controlling facies distribution include the direct inflow of sediment from alluvial-fan systems and incising mountain rivers onto the Cretan slope, where significant sediment instability processes occur at present. In this setting, seismic profiles reveal eight different types of stratigraphic contacts on basin-margin highs, and basinal areas show evidence of halokinesis and/or fluid escape. The acquired data also show that significant changes to the margin’s configuration occurred in association with the post-Alpine tectonic and eustatic episodes affecting the Eastern Mediterranean.  相似文献   

海洋古生产力重建初探──以南沙群岛海区NS90-103柱样为例     

吴时国  涂霞  罗又郎 《海洋科学》1996,20(2):47-51

以南沙海区ＮＳ９０－１０３柱样为例，利用各种古生产力指标物，如有机碳含量，有孔虫壳和有孔虫碳同位素，重建了２０００００ａ以来古生产力变化，并对结果予以讨论。  相似文献   

廉州湾及其邻近水域初级生产力研究     

吕瑞华  夏滨  毛兴华 《海洋科学进展》1995,(2)

１９９２～１９９３年，在对廉州湾及其邻近海域的环境调查中，首次对该海区叶绿素ａ与初级生产力进行了测定。获得叶绿素ａ的春季平均值为１．００ｍｇ·ｍ－３，秋季为０．２９ｍｇ·ｍ－３，初级生产力的平均值为３０１．５ｍｇ·ｍ－２·ｄ－１。文章对调查区初级生产力的分布特征及变化规律进行了探讨，并与北方沿海的初级生产力水平进行了比较。  相似文献   

天然水体中酚的降解动力学     

吴欣然  夏福兴  吴玲  陈邦林 《海洋科学》1992,16(1):33-37

本文报道了天然水体中低浓度酚的降解动力学;计算了它的降解速率常数、降解活化能等。降解半表期是t_(1/2)=1.5d~(-1)(10℃),t_(1/2)=O.74d~(-1)(30℃)。低浓度酚的降解动力学跟天然水体中酚的降解情况比较接近。本文的结果对环境评价、蓄水库工程设计等很有参考价值。  相似文献   

我国海洋软相底质底栖经济贝类的可持续利用探讨   总被引：1，自引：0，他引：1  

吴进锋  梁超愉  陈利雄  陈素文  李夏 《海洋湖沼通报》2005,(2):93-98

分析了海洋软相底质底栖贝类的资源特性和我国的资源利用现状及存在问题．并从规模化苗种生产、海区增殖、高效养殖模式开发及增养殖环境保障与产品无公害生产等方面对该资源的可持续利用进行了探讨。  相似文献   

热带气旋对黄、渤海影响的统计特征分析   总被引：3，自引：0，他引：3  

张晓慧  卢霞  颜梅 《海洋湖沼通报》2003,(2):11-16

本文统计分析了1949—2000年共52年影响黄、渤海的热带气旋时空分布特点及ENS0、西太平洋副热带高压与影响黄、渤海的热带气旋关系。结果表明，西太平洋热带气放以四种主要路径影响黄、渤海，其影响时间、频数及强度均有不同。ENSO和西太平洋副热带高压的强度、位置将影响热带气旋对黄、渤海影响的路径和频数。  相似文献   

摄食水平和性别对稀有鮈鲫生长和能量收支的影响   总被引：7，自引：0，他引：7  

朱晓鸣  解绶启  崔奕波  杨云霞  光寿红 《海洋与湖沼》2001,32(3):240-247

于1995年10月采集本所自繁有ju鲫（约1.03g/ind)，在30℃水温下进行摄食－生长实验，研究了从饥饿到饱食5个摄食水平对不同性别稀有ju鲫的生长和能量收支的影响，结果表明，鱼体干物和能量含量不受摄食率和性别的影响，随着摄食率的增加，雌鱼的湿重，干重和能量特定生长率均呈双对数增加，雄鱼湿重特定生长率呈双对数增加，而干物质和能量特定生长率呈指增加，雄鱼生长速度及摄食率低于雌鱼，随着摄食率的增加，食物能损失于粪便中的比例均呈上升趋势，损失于排泄物中的比例变化不大，呈下降趋势，用于代谢的比例呈下降趋势，用于生长的比例呈上升趋势，除饥饿组外，在各个摄食水平，雌鱼食物能用于代谢的比例较雄鱼低，而用于生长的比例较雄鱼高。  相似文献   

Mechanisms controlling the temporal variation of the sea ice edge in the Southern Ocean     

Noriaki Kimura 《Journal of Oceanography》2007,63(4):685-694

This paper examines the mechanism controlling the short time-scale variation of sea ice cover over the Southern Ocean. Sea ice concentration and ice velocity datasets derived from images of the Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager (SSM/I) are employed to reveal this mechanism. The contribution of both dynamic and thermodynamic processes to the change in ice edge location is examined by comparing the meridional velocity of ice edge displacement and sea ice drift. In the winter expansion phase, the thermodynamic process of new ice production off the ice edge plays an important role in daily advances of ice cover, whereas daily retreats are mostly due to southward ice drift. On the other hand, both advance and retreat of ice edges in the spring contraction phase are mostly caused by the dynamic process of the ice drift. Based on the above mechanism and the linear relation between the degree of ice production at the ice edge and northward wind speed, the seasonal advance of ice cover can be roughly reproduced using the meridional velocity of ice drift at the ice edge.  相似文献