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1.
Well S provides a good opportunity to investigate the petroleum filling history in Tazhong North Slope. Petrographic investigations suggest that bitumen, oil, and petroleum inclusions coexist in Silurian sandstones from well S, reflecting a complicated reservoir filling history in the study area. Integration of organic geochemistry and fluid inclusion analysis shows that the Silurian reservoir has experienced three episodes of petroleum charge, that is from the late Silurian to the early Devonian, the early-middle Triassic and the Paleogene, respectively. The present-day reservoir fluids in the Silurian are the mixtures generated in multiple （ at least two） episodes of petroleum charge. The oil charging into Silurian resevior in the early period had experienced considerable degradation, and was mixed with later non-degraded oil. 相似文献
2.
Jérémie Soldner 《国家科学评论(英文版)》2023,(2):7-8
<正>The Central Asian Or ogenic Belt(CAOB) [1],which includes the Altaids in Central and Northern Asia [2],is the largest accretionary orogen formed during the subduction of the Paleo-Asian Ocean and the Panthalassa Ocean in the period of the Late Proterozoic to Late Paleozoic [3].Closure of the Paleo-Asian Ocean is attributed to the northward drift of the North China and Tarim cratons leading to the massive shortening and oroclinal buckling of the CAOB accretionary system in the Permian [4... 相似文献
3.
Kingsley Burlinson 《中国科技期刊研究》2007,23(1):65-71
The acoustic decrepitation method heats a small monomineralic sample and counts pressure impulses as the inclusions burst when they develop high internal pressures. For aqueous fluids, the decrepitation temperature is correlated with the homogenisation temperature, but gas rich fluids give a distinct and characteristic low temperature decrepitation peak which can be used to recognize gas rich fluid inclusions. This information is useful in exploration for Au deposits, which are frequently associated with CO2 rich and sometimes CH4 rich fluids. This distinctive decrepitation occurs because the CO2 rich inclusion fluids expand according to the gas law and develop internal pressures high enough to burst the host mineral grain at temperatures well below their homogenisation temperatures. In contrast, aqueous fluids condense to a liquid and vapour phase during post-entrapment cooling. Upon subsequent heating their internal pressures do not increase significantly until after homogenisation to a single phase occurs and hence they do not decrepitate ＂prematurely＂ as gas rich inclusions do. This behaviour is usually regarded as an annoyance in conventional microthermometric homogenisation studies, but can readily be used as an exploration aid to find mineralisation deposited from such gas rich fluids. Decrepitation results on samples from Cowra Ck, NSW, Australia, which have also been microthermometrically measured for CO2 content, show that amounts of less than 5 mole % CO2 are easily distinguished by decrepitation and amounts as low as 1 mole % CO2 may be determinable. Examples of the use of acoustic decrepitation in the study of 6 gold mines in the Shandong and Hebei provinces of China are discussed. 相似文献
4.
《国家科学评论(英文版)》2015,(4)
The impact of the Tibetan Plateau uplit on the Asian monsoons and inland arid climates is an important but also controversial question in studies of paleoenvironmental change during the Cenozoic. In order to achieve a good understanding of the background for the formation of the Asian monsoons and arid environments, it is necessary to know the characteristics of the distribution of monsoon regions and arid zones in Asia before the plateau uplit. In this study, we discuss in detail the paterns of distribution of the Asian monsoon and arid regions before the plateau uplit on the basis of modeling results without topography from a global coupled atmosphere–ocean general circulation model, compare our results with previous simulation studies and available biogeological data, and review the uncertainties in the current knowledge. Based on what we know at the moment, tropical monsoon climates existed south of 20?N in South and Southeast Asia before the plateau uplit, while the East Asian monsoon was entirely absent in the extratropics. hese tropical monsoons mainly resulted from the seasonal shits of the Inter-Tropical Convergence Zone. here may have been a quasi-monsoon region in central-southern Siberia. Most of the arid regions in the Asian continent were limited to the latitudes of 20–40?N, corresponding to the range of the subtropical high pressure year-around. In the meantime, the present-day arid regions located in the relatively high latitudes in Central Asia were most likely absent before the plateau uplit. he main results from the above modeling analyses are qualitatively consistent with the available biogeological data. hese results highlight the importance of the uplit of the Tibetan Plateau in the Cenozoic evolution of the Asian climate patern of dry–wet conditions. Future studies should be focused on efects of the changes in land–sea distribution and atmospheric CO2 concentrations before and ater the plateau uplit, and also on cross-comparisons between numerical simulations and geological evidence, so that a comprehensive understanding of the evolution of the Cenozoic paleoenvironments in Asia can be achieved. 相似文献
5.
Shuya Guo Jingrou Tan Hengbin Zhang Jinguang Wang Tianhao Ji Labao Zhang Xiaolong Hu Jian Chen Jun Xie Kai Zou Yun Meng Xiaomin Bei Ling-An Wu Qi Chen Hao Wang Xuecou Tu Xiaoqing Jia Qing-Yuan Zhao Lin Kang Peiheng Wu 《国家科学评论(英文版)》2024,(1):194-203
Precisely acquiring the timing information of individual X-ray photons is important in both fundamental research and practical applications. The timing precision of commonly used X-ray single-photon detectors remains in the range of one hundred picoseconds to microseconds. In this work, we report on high-timing-precision detection of single X-ray photons through the fast transition to the normal state from the superconductive state of superconducting nanowires. We successfully demonstrate a free... 相似文献
6.
This essay is intended to explore some of the elements which bring about the tragic destiny of the heroine, Eustacia. She is a beautiful and romantic woman with violent passions. In her dark beauty, Hardy has painted one of his most memorable portraits. This essay attempts to deal with the topic question primarily from two aspects, the inner world of Eustacia herself and the external world around her. In Hardy＇ s work, human existence is usually depicted as a tragedy determined by powers beyond the individual＇ s command the external pressures of society and the internal compulsions of character. 相似文献
7.
《中国科学院院刊(英文版)》2015,(4)
<正>The hominin record from southern Asia for the early Late Pleistocene epoch is scarce.Well-dated and well-preserved fossils older than 45.000 years that can be unequivocally attributed to H.sapiens are lacking.In a paper published October 15 online in Nature,Dr.LIU Wu from Institute of Vertebrate Paleontology and Paleoanthropology(IVPP).CAS,and his international team announced the discovery of human teeth between 80.000 and120,000 years old from the newly excavated Fuyan Cave in Daoxian.southern China,and provided the earliest evidence 相似文献
8.
Daffodils are popular among people around the world.The daffodil is made the top ten in flowers in China In English and Chinese literature, it is a popular theme glorified by poets and writers. This essay is to present different symbolic images of daffodils in Chinese and English poems so as to help Chinese readers understand the meaning of daffodils in English literature. 相似文献
9.
李中明 《中国科学院研究生院学报》1983,21(2):153-160
The genus Palaeosmunda was established by R. E. Gould in 1970 based upon some
Late Permian Osmundaceous trunks with well-developed leaf gaps and rhomboidal
sclerotic ring within petiolar base seen in cross section. As he thinks that the latter
character is more important than the former, this genus could not be assigned to any
subfamily of Osmundaceae.
However, the leaf gap is one of the most important characters in the structure of the fern stem, so the author suggests that this genus should be assigned to subfamily
Osmundoideae and its diagnosis must be emended as follows:
The genus Palaeosmunda is represented by some rhizomes (or trunks), roots and
leaf bases of ferns which structurally are preserved, resembling Osmundacaulis but
which can’t be assigned to any group of this genus.
Stem containing an ectophloic dictyoxylic siphonostele; if tracheids present in
the pith, they being multiseriate scalariform pitted; pith or cortex sometimes contain-
ing groups of secretory cells or sclerenchyma; number of leaf traces seen in a tran-
sverse section of cortex more than 30; leaf traces adaxially curvature, rarely oblong-
shaped; petiolar bases with or without stipular expansion, containing a C-shaped
vascular strand; root diarch.
Type species——Palaeosmunda williamsii.
According to this diagnosis some primitive osmundaceous species with the leaf
gaps, which have already found in Upper Permian and Lower Triassic, could be assigned
to this genus. Two of them are P. williamsii Gould and P. playfordii Gould, and
Osmundacaulis beardmorensis, which was from Lower Triassic of Antarctica in 1978,
should be assigned to the genus Palaeosmunda.
In this paper two osmundaceous new species: P. primitiva and P. plenasioides were
found in the coal balls of Upper Permian age from Wangjiazhai of Shuicheng of
Guizhou Province, China.
P. primitiva is represented by two trunks; stem about 4 cm in diameter; stele
actophloic dictyoxylic siphonostele; pith cavity about 3—4 mm in diameter, contianing
parenchyma and tracheids; xylem cylinder thin, less than 10 tracheids in radial thick-
ness, dissected by leaf gaps. Inner cortex about 1.5 cm thick, mainly parenchymatous,
but sometimes containing a few sclerenchymatous; number of leaf traces seen in a
transverse section about 50—60; leaf traces departing at 35—45º,open C-shaped at
point of departure, gradually becoming shallow C-shaped or V-shaped in different
parts; protoxylem in base of leaf traces single, endarch; when leaf traces pass through
inner cortex, protoxylem biturcating. Petiole bases without stipular expansion, probablyloosely embracing the stem; xylem strand of potiole trace shallow C-shaped, surrounded by selerenchyma; sclerotic ring round, connected with single sclerenchyma mass in the concavity of the petiole trace. Root arising singly from leaf trace, diarch, with inner and outer cortex.
P. plenasioides is represented by a rhizome; stem more than 4 cm in diameter;
stele actophloic dictyoxylic siphonostele; xylem cylider with about 20 tracheids in
radial thickness, dissected by leaf gaps; xylem bundle U-, O-, or crosier- (i.e. query-)
shaped; pith and inner cortex parenchymatous, with many groups of secretory cells;
leaf trace C-shaped, its base containing two endarch protoxylem groups; root diareh,with inner and outer cortex, arising singly from leaf trace or its base. 相似文献
10.
This paper discusses the INAA results of REE in clays atand near some Permian/Triassic boundaries of South China.It showsthat the REE patterns of boundary clays differ from those of non-boundary clays.One difference is that the boundary clays are moreenriched in LREE,with steeper slope of REE and a smaller Eu nega-tive anomaly than the non-boundary clays.Another difference is that theboundary clays show a small Ce negative anomaly,but no Ce anomalyoccurs in the non-boundary clays.From these REE patterns and some other experimental facts,it isproposed that the P/T boundary clay may be a mixed product consistingof the acidic-intermediate ash and the upper crust substance representingsputtering component,and the calculated fraction of the former andlatter is 7/3. 相似文献
11.
欧佩克(OPEC)是一个稳定的、政府间石油供应组织,其石油政策的核心是制定符合其自身经济和政治利益的石油政策。影响欧佩克石油政策的因素很多且非常复杂。本文在对欧佩克成立以来石油政策进行全面回顾的基础上,根据国际石油市场新形势和新情况,结合欧佩克石油中长期发展战略等,提出了影响欧佩克石油政策的7个主要因素:世界石油供需形势,世界经济发展状况,市场投机炒作,欧佩克成员国派别、政治体制和外交政策,石油进口国及消费国能源政策,非欧佩克对欧佩克的竞争博弈以及替代能源。这些因素并非是单一的和独立的,其互相联系,互相促进,共同影响和推动欧佩克未来石油政策的走向。未来欧佩克以全球石油供需形势为基础,统筹考虑世界经济发展状况、市场投机炒作等因素,实施一种使油价逐步接近和达到替代能源的价格水平的比较适中的油价政策。欧佩克未来石油政策更趋理性和合理。 相似文献
12.
石油市场的金融支持体系研究 总被引：3，自引：0，他引：3
国际石油市场价格不断攀升,中国作为第二大消费国深受影响。国际石油市场供求基本面背后活跃着各类金融资本,基金、银行、跨国石油公司等作用强大,推动石油衍生品远高于现货规模的巨额成交量,并使衍生品的定价和避险功能在国际石油市场得到广泛运用。并且石油与外汇、基金的紧密关系也表明石油市场的金融化特性必须得到正视。同时,国内石油价格市场化过程中由于不合理的定价机制出现利润转移矛盾,深受价格波动之苦的石油相关产业也迫切需要价格避险的市场和工具,石油企业“海外寻油”也需要金融支持。因此借鉴国际市场发展,构建我国石油市场的金融支持体系顺应趋势和需求。核心是建设国内多层次的石油市场,创新各类石油衍生品交易品种,提供市场交易平台。石油基金、石油外汇和石油银行的运作是石油市场发展的动力,并通过石油金融支持的法律法规、部门规章程序加以保障。 相似文献
13.
构建石油金融体系：中国石油安全的战略选择 总被引：14，自引：1，他引：14
目前,中国已进入重化工业阶段,是完成工业化过程的关键时期,作为"工业血液"的石油无疑已成为事关全局的战略资源.2004年以来,国际石油价格大幅上涨.同时,中国石油消费和需求增长强劲,国内石油供给严重短缺,对外依存度高达40%以上.综观当前石油市场的形势,世界并不缺油.因此,中国石油安全的真正问题并不是供给不足,而是国际市场上的价格风险.而国际石油市场的发展趋势是石油与金融的联系日益紧密,期货价格已成为国际石油价格的重要基准,金融已成为国际石油价格的重要影响因素.要确保国家的石油安全,中国迫切需要把建立石油金融体系提高到战略的高度,以加强在国际石油市场上的话语权,合理规避石油价格风险,维持中国经济的持续发展.为此,中国应该建立有关石油的货币金融政策、建立石油产业发展基金、建立和做大石油衍生品市场. 相似文献
14.
在不同工况下,通过对制冷剂以及冷冻油在多联机组管路中流动的特点分析,总结出影响多联机组回油的因素,并提出保证多联机正常回油的措施。 相似文献
15.
中国石油进口参与国际定价的现状、趋势及策略分析 总被引：8，自引：0，他引：8
目前,中国是世界上石油、铜、大豆等许多大宗原材料的大买家,也是世界大宗原材料贸易需求的强大拉动者。据统计从2003年五月份起,中国石油消费量己经超过日本,成为仅次于美国的世界第二大石油消费国;据巴黎国际能源机构预测,中国的能源需求总量还将继续增加。但这种地位,丝毫没有为中国赢得石油大宗进口的国际定价话语权,中国的石油进口量占世界石油供应总量的2%,但在影响石油定价的权重上却不到0.1%。这一现象正威胁着中国的经济和金融安全,成为中国经济进一步发展的瓶颈。为此,中国应以争取应有的石油进口国际定价权为根本出发点,借鉴发达国家的经验,着重从发展自己的石油期货市场,和组建价格联盟入手,实施中国获取石油定价权以及进一步建立自己的国际定价中心的策略安排。 相似文献
16.
石油衍生产品及其价格风险管理 总被引：1，自引：0，他引：1
石油是现代工业的血液,重要的战略物质。20世纪70年代末,石油价格的自由波动使风险管理成为石油企业的核心。衍生产品因其独特的优势非常适合石油价格风险的管理而被引入石油市场,使世界石油市场交易方式发生了重大变革。世界石油衍生品市场,包括:纽约商品交易所、伦敦国际石油交易所、新加坡交易所,得到了极大的发展,成为国际石油市场的重要组成部分。目前,石油衍生产品市场围绕着两个互补的轴线发展:大公司石油价格风险的套期保值和石油行业的金融性操作。石油远期、期货、期权、互换都发挥着各自的作用,尤其是一些特有的石油衍生产品:油价顶、裂解基差交易、裂解基差期权、跨期价差期权、体积产量支付合同等,为适应石油行业的需要而产生。石油市场的国际化以及石油市场形式的多样性,使得石油衍生品的价格风险管理具有其它实物资产价格风险管理难以比拟的优势,实际情况表明石油行业成功地运用衍生品管理了价格风险。 相似文献
17.
旧油桶重新投入使用前,必须对油桶进行清洗及干燥。本文通过对清洗原理及待洗油桶内部油垢状况的研究,提出了一种油桶的清洗工艺流程。 相似文献
18.
高油价时代的国际石油地缘政治与中国石油贸易格局 总被引：6，自引：0，他引：6
近年来,世界各国对石油资源的争夺愈演愈烈,油价也一路攀高。高油价的背后,反映的是国际石油地缘政治格局以及世界石油市场格局正在发生着重大变化。当前国际石油地缘政治格局是美国主导、供给方(OPEC、俄罗斯为代表的Non-OPEC、非洲)三分天下的局面。其特点是:除政治、军事手段外,各国还通过争夺石油定价权、进口多元化、石油民族主义、建立战略储备、石油期货等方式来保证石油安全。目前中国每年进口石油的数量与金额不断增加,屡创新高。2005年原油进口达到1.27×108t,对外依存度达到45%,已成为世界第二大石油进口国,并且进口数量与对外依存度在未来还将进一步增加,到2030年有可能达到60%。如何保障石油安全已成为国家层面的战略问题。通过对历年来进口石油的数据统计分析,作者认为要保证中国的石油战略安全,应着重处理好3方面的地缘政治关系:与俄罗斯和中亚的关系;与美国的关系;与日本和东南亚各国的关系。并从国家战略层面这一角度提出化解石油安全的具体措施。包括:①发挥上海合作组织的地缘政治优势;②构建多元化的石油供应战略格局;③建立石油战略储备;④利用石油期货等金融工具规避价格风险。 相似文献
19.