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苏北地区泥岩欠压实现象与油气保存的关系 总被引：2，自引：0，他引：2
泥岩欠压实现象是苏北地区，特别是苏北盆地东台陷下第三系地层中重要的地质特征之一。在对泥岩欠压实现象的研究中发现，东台坳陷的泥岩中压力封闭形成时间早于毛细管封闭的形成时间,而且封闭能力较强，对第三系油气的早期保存起着重要作用。另外，欠压实的存在说明断裂、裂隙系统尚未能打破“暂时”的压力不平衡现象，具有欠压实现象的地层可以作为具有封挡能力的区域性的或圈闭的纵向封隔层。在苏北地区用欠压实表示泥岩层的封挡能力显示：新生界盆地地区和下第三系古、始新统封存条件最为优越；中生界欠压实现象不很普遍，其油气封存条件具有局部性；上古生界欠压实现象较明显，为苏北地区海相中、古生界地层中具有最优越封存条件的层系；志留系高家边组欠压实现象相对较弱。 相似文献
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南黄海海域油气勘探近40年成果证实,南黄海盆地与相邻的苏北盆地具有相似的发育历史。目前,苏北已在中、古生界近50口钻井中见到油气显示,其中在下三叠统青龙组和上石炭统船山组发现了大量油气显示,在盐城朱家墩发现源于中、古生界的再生气田,在黄桥镇苏174井志留系坟头组以及泥盆系五通组砂岩中钻遇液态CO2及轻质油,证明下扬子中、古生界存在油气生成和运聚的成藏过程,具有良好的油气勘探前景。 相似文献
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在对南黄海盆地海相中、古生界烃源条件和后期保存条件研究的基础上,运用盆地模拟手段并结合前人研究成果,对海相地层烃源岩的排烃史进行了模拟,计算了海相地层油气资源量,从而进行了海相油气资源潜力的分析;同时通过对海相上构造层和下构造层两套含油气系统成藏条件的研究,预测了盆地内海相油气资源的有利运聚区,进而指出南黄海盆地海相油气勘探的有利区,为下一步南黄海盆地的勘探部署提供了依据。研究表明,南黄海盆地海相下构造层和海相上构造层栖霞组、龙潭组—大隆组烃源岩推测为好的烃源岩,海相上构造层青龙组烃源岩推测为中等—好的烃源岩;盆地海相地层具有一定的油气资源潜力,油气资源总量为35.37×10^8t,且在纵向上,油气资源主要来自海相下构造层烃源岩系,在平面上主要分布于南部坳陷;盆地海相地层存在两类油气资源勘探有利区,其中,最有利区位于中部隆起区南部、南部坳陷区和勿南沙隆起区北部。 相似文献
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东南亚地区发育100多个新生代沉积盆地，这些沉积盆地经历了不同程度的裂谷作用。为了指导东南亚油气勘探，通过对盆地构造-沉积演化进行分析，系统研究了东南亚地区盆地油气成藏组合的要素特征，并探讨了裂谷作用对油气成藏组合的影响。研究结果认为：东南亚地区盆地构造-沉积演化经历了同生裂谷早期、同生裂谷晚期、后裂谷早期和后裂谷晚期4个裂谷作用阶段。根据裂谷作用阶段和在相应裂谷作用阶段形成的储层类型，从深到浅划分出4套油气成藏组合：深部成藏组合、下部成藏组合、中部成藏组合和上部成藏组合。深部成藏组合发育同生裂谷早期湖相浊积砂岩、湖相冲积扇储层，下部成藏组合发育同生裂谷晚期海进时期河流-三角洲砂岩储层，中部成藏组合发育后裂谷早期海相碳酸盐岩储层，上部成藏组合发育后裂谷晚期海退时期河流-三角洲砂岩储层。其中，中部成藏组合发育的后裂谷早期海相碳酸盐岩储层勘探潜力最大。 相似文献
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南黄海中、古生界油气勘探前景 总被引：9，自引：2，他引：9
近几年少量的地球物理勘探工作表明，南黄海印支面以下存在厚达5000m以上的海相中，古生界，而且保存远比苏北陆区好，是南黄海新的勘探领域，中部隆起和勿南沙隆起稳定，面积大，有望找到大中型油气田，是具有远景的勘探新区。南黄海的油气勘探，中部隆起和勿南沙隆起应注意寻找与两个不整合面有关的，上有盖层封堵的非构造型内幕原生油气藏，在有利凹陷区以及隆起与坳陷接合部位应注意寻找中，上古生界再生油气藏；北部坳陷在注意寻找陆相中生界油气藏的同时还应注意寻找断块潜山型海相中，古生界再生油气藏。 相似文献
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Size-fractionated uranium isotopes in surface waters in the Jiulong Estuary in China 总被引：1，自引：1，他引：0
L&#; E ZHANG Lei CHEN Min QIU Yusheng XING N YANG Weifeng LI Yanping HUANG Yipu 《海洋学报(英文版)》2008,27(1):29-41
Surface water was collected from the Jiulong Estuary for determination of activity concentrations of uranium isotopes in different size fractions, namely, greater than 53, 10 -53, 2 - 10, 0.4 -2 μm, 10 000 u -0.4 μm and less than 10 000 u fractions by microfihration and cross-flow uhrafiltration technologies. Results indicated that most of the dissolved uranium （ 〈 0.4 μm） exis- ted in the low molecular mass fraction （ 〈 10 000 u）, and the colloidal uranium-238 （10 000 u -0.4 μm） only contributed less than 1% of the dissolved uranium-238. The fractions of colloidal uranium in the dissolved phases decreased with the increasing sa- linity. A positive linear relationship between uranium-238 activities and salinities was observed for the dissolved, colloidal and low molecular mass fractions, indicating a conservative behavior of uranium in the Jiulong Estuary. In the particulate phases （ 〉 0.4 μm）, the partitioning of uranium isotopes among different size fractions was controlled by the partitioning of particle concentrations. In the regions with salinities below 20, the partitioning of uranium-238 among different size fractions was as follows： 10 - 53 μm 〉 2 - 10 μm 〉 0.4 - 2 μm greater than above 53 μm. However, the order at the offshore station with salinities above 30 changed as follows ： 0.4 - 2 μm 〉 10 - 53 μm 〉 2 - 10 μm greater than above 53 μm. The fraction of the 0.4 - 2 μm particles increased at the offshore station, suggesting the increased contribution of the authigenic uranium. The activity ratio of uranium-234 to uranium-238 in the dissolved phases, including the low molecular mass fraction and the colloidal fraction, was larger than unity, showing the occurrence of excess uranium-234. In contrast, the activity ratio of uranium-234 to uranium-238 in all size fractions of the particulate phase was close to the equilibrium value （1.0）. The observed different values of the activity ratio of uranium-234 to uranium-238 in the dissolved phase and the partic 相似文献
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Much of the recent Canadian activity in marine technology has focused on development of capabilities in Arctic waters, and on the update and replacement of naval vessels. This paper describes some of the significant projects and programs now under way, and suggests future research and development requirements. 相似文献
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对一氧化氮在浮游植物中的研究进展进行了归纳,总结了一氧化氮对浮游植物生长的影响,探讨了浮游植物中一氧化氮的产生机制,并对今后的研究重点提出展望。 相似文献
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《Marine Policy》2013
Marine environment protection in Europe faces a number of challenges. One is the coordination of relevant sectoral policies — such as agricultural and fisheries policies — with regard to marine protection objectives. The question in the following is on how marine protection issues can be more closely integrated in sectoral policies under the conditions prevailing at present. In particular the strength and weaknesses of the Marine Strategy Framework Directive (MSFD) as the key instrument for marine environment protection in Europe are analyzed in this context. In particular, the MSFD does not adequately address all sectors and policies which are relevant to marine environment protection. One possible means of giving the MSFD greater influences on other policies of relevance to marine waters is to integrate the objectives established under the MSFD in the European maritime policy. The aim should be to require the further development of sectoral policies to take unrestricted account of the objectives of the MSFD implementation process. But also other instruments of marine policy such as maritime spatial planning and marine protected areas are crucial to advance the protection of European seas. 相似文献
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JIN Xianglong 《海洋学报(英文版)》2013,32(12):1-3
In China submarine geosciences represents a newly established discipline of oceanography, focusing on the oceanic lithosphere, and its interface with the hydrosphere and biosphere. Recently, supported by the National High Technology Research and Development Program and other high-tech development projects, significant progress has been made in the development of advanced technologies and equipment. This en- ables the scientists in China to carry out explorations of the international seabed area in the Pacific Ocean and on the Southwest Indian Ridge. In addition, they have been active in the research activities associated the mid-ocean ridges and western Pacific marginal seas. It is anticipated that this research field will continue to be highly fruitful in the near future. 相似文献
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湄洲湾夏季的初级生产力 总被引：2，自引：3，他引：2
湄洲湾１９９２年夏季的叶绿素ａ，三磷酸腺苷，碳比积累速率，初级生产力的变化范围和均值分别为０．４５－４．７２，１．４９ｍｇ／ｍ＾３；０．１２－１．０７，０．３１μｇ／ｄｍ＾３；０．０６－０．５８，０．３４ｄ＾－１；０．０７－０．３４，０．２１ｍ／（ｍ＾２．ｄ）。叶绿素ａ与三磷酸腺苷之间。初级生产力与碳比积累速率之间均呈正相关关系。叶绿素ａ三磷本能腺苷的比值为４．８，湄洲湾夏季浮游植物的生长受氮不足 相似文献
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In order to investigate factors controlling nutrient cycling in the shallow and turbid coastal ecosystem of Galveston Bay, data from: (1) the Texas Water Commission (TWC) database 1980–1989, and (2) salinity transects in 1989 and 1993 are presented and analyzed. Statistical regression and time-series analysis were carried out on data acquired by TWC between 1980 and 1989, in an attempt to establish seasonally of nutrient and chlorophyll-a (chl.-a.) concentrations in the bay and to determine factors which regulate these concentrations.A strong seasonality was found for phosphorus and chl.-a. in the upper and mid-bay stations. A recurring maximum for phosphate occurred in September and a chl.-a. maximum occurred regularly in March–April. It is hypothesized that benthic regeneration of phosphorus at the end of summer is responsible for the phosphate maximum. The inverse correlation of the partition coefficient (Kd) for phosphate with the concentration of suspended particulate matter (SPM), coupled to a strong enrichment of phosphate in suspended particles at low SPM concentrations, indicates additional control by geochemical and physical processes such as particle sorting and/or particle-colloid interactions. Nitrate is inversely correlated with salinity at the upper and mid-bay stations, indicating the Trinity River is a major source.Nutrient concentrations in the lower bay (East and West Bay stations) are considerably lower and less predictable, as they are not correlated with salinity or temperature. Data from the 1989 and 1993 transects confirm the yearly maximum in phosphate concentration in late summer months, with peak concentrations in the upper Trinity Bay. It is concluded that despite possible phosphate buffering by physical and geochemical mechanisms, relatively large concentration maxima recur regularly every year during the summer, possibly caused by a benthic source of phosphate. 相似文献