西秦岭文县地区关家沟组海底扇沉积体系

对西秦岭南部文县地区关家沟组的成因，学者之间的认识存在较大分歧，长期以来被看作是可与南沱组对比的冰碛层。关家沟组形成于新元古代末期(晚震旦世)，沿扬子板块西北边缘分布。根据地层剖面和扇地质体的平面填网研究表明，关家沟组存在两种沉积体系——海底扇沉积体系和盆地沉积体系；海底扇沉积体系中发育大量的各种类型的粒序层理及鲍玛层序；扇体的剖面结构相似于Walker(1979)提出的海底扇反旋回沉积序列，层理类型与Winn和Dott(1979)提出的海底扇的层理类型类似；扇体的平面结构(填图追索圈定)清楚地显示了海底扇砂砾岩与盆地相页岩、硅质岩之间的穿插相变关系。其剖面结构可划分出4个级别的不对称它旋回性韵律，显示出扇体向盆地推进和相对海平面的降低。研究表明关家沟组砂砾岩为海底扇沉积体系，而非冰碛层。     

东营凹陷永921-920区块沙四上亚段砂砾岩体沉积特征

砂砾岩体是断陷盆地陡坡带主要的油气储集体。结合地震、测井、录井、岩心、镜下薄片、粒度分析、孔渗化验等资料,对
山东省东营市盐家油田永921-920区块沙四上亚段砂砾岩体的沉积特征、成因机制及储层特征进行了研究。结果表明,该区块砂
砾岩体受控于北部边界断裂控制的近岸水下扇,岩石结构成熟度与成分成熟度均低,粒度概率曲线发育缓慢上拱形与低斜两段式
以及块状层理、反粒序层理、鲍马序列(Ta,Tb,Td段)、截切构造、泥岩撕裂屑、滑塌揉皱变形层理等均反映了重力流沉积特点,同
时也可见槽状交错层理、平行层理、沙纹层理及水平层理等反映牵引流的沉积构造;识别出4期砂砾岩扇体,早期叠置连片,晚期
孤立分散,呈退积型沉积复合体,第Ⅰ、Ⅱ及Ⅲ期上部砂砾岩体储层质量较好,其中扇中辫状水道物性最好,扇中前缘与内扇主水
道物性相对较差。      

东营凹陷王庄地区古近纪沙河街组三段扇三角洲砂砾岩体沉积特征分析

本文利用现代沉积学、测井学和地震勘探等手段,对王庄地区砂砾岩扇体特征进行了研究,认为该区在古近纪以形成古近系的较高水动力能砂砾岩扇体沉积体为主,其中扇三角洲砂砾岩体是本区最主要的砂砾岩扇体类型,并具有较好的储集性能,是本区最主要的油气储集体;王庄地区砂砾岩扇体沉积,强烈地受控于边界构造条件;砂砾岩扇体沉积及其形态均受沉积相的控制,并具有复杂多变的特征,从而导致了本区油气藏的聚集和分布具有复杂多变的特点。     

西非第三系深水扇沉积特征及发育演化规律

以西非主要深水油气产区——下刚果盆地和尼日尔三角洲盆地为样本,分析西非地区典型深水扇的沉积特征、发育演化规律及主控因素.结果表明:受物源供给类型、盆地结构、构造活动及地形、海平面升降等因素影响,两个盆地深水扇体系表现不同特征和演化模式,其中下刚果盆地深水扇体系表现为点物源河流直接供给的大型单扇模式,深水水道及溢岸沉积构成该类型深水扇的主要沉积单元;尼日尔三角洲盆地深水扇为线物源三角洲供给的中型群扇模式,深水沉积单元类型多样.由于沉积物流速和沉积物结构改变,控制重力流流体性质,导致深水扇体沉积特征及储层分布在平面和垂向上发生变化.     

渤海海域石南陡坡带多期砂砾岩扇体识别与展布特征

根据钻井、测井和三维地震等资料,建立渤海海域石南陡坡带多期砂砾岩扇体沉积成因模式,采用时频分析技术,结合井震识别标志,划分砂砾岩扇体沉积期次;利用瞬时相位处理和沉积演化模拟方法,精细刻画每期砂砾岩扇体展布特征。结果表明:石南陡坡带发育4期砂砾岩扇体,从早期到晚期总体具有持续性后退、范围缩小的特征。不同期次扇体展布规律存在差异,陡坡带中西部发育4期砂砾岩扇体,展布范围较大,东部发育3期扇体,展布范围较小。研究区西部、中部和东部的扇三角洲前缘没有叠置,砂砾岩扇体之间连通性较差。石南陡坡带有2个主力油层,分别为第3、第4期砂砾岩扇体。该结果为类似低勘探程度区油气勘探开发提供参考。     

沾化凹陷桩西地区沙三段-沙一段沉积相及其演化

沾化凹陷桩西地区沙三段-沙一段沉积时期构造复杂,沉积类型多样。在研究区17口取心井岩心观察和描述的基础上,结合地震、测井、录井等资料,对桩西地区沙三段-沙一段的扇三角洲、浊积岩和滩坝等沉积体特征及演化进行了系统分析。在沉积相研究的基础上,根据单因素分析多因素综合作图法,选取砂砾岩厚度、砂砾岩百分含量、碳酸盐岩厚度及生物灰岩百分含量分布等单因素,对桩西地区沙河街组不同层段的沉积相平面展布特征进行了深入研究,并探讨了其演化规律。结果表明:桩西地区沙三段沉积时期在靠近长堤断层的湖盆边缘沉积扇三角洲砂体,在湖盆中心同生断层下降盘沉积浊积岩砂体;沙二段沉积时期在靠近长堤断层的湖盆边缘沉积扇三角洲砂体,在桩西潜山周缘和研究区西北边缘处沉积互层的砂质滩坝和生物滩;沙一段沉积时期主要在靠近湖盆边缘沉积生物滩和湖相碳酸盐岩,在湖盆中心部位沉积泥岩和油泥岩。      

辽河盆地东部凹陷古近系沙河街组层序地层及沉积相研究

根据岩心、测井和地震资料综合分析结果,研究辽河盆地东部凹陷沙河街组层序地层划分、沉积相类型及展布特征,东部凹陷沙河街组层序地层格架中识别出3个三级层序界面(SB1、SB2和SB3),划分2个三级层序(SQ1和SQ2);识别出冲积扇相、扇三角洲相、辫状河三角洲相、浊积扇相和湖泊相等沉积相类型.基于层序地层格架的划分和层序格架沉积砂体的特征研究,结合岩心相、测井相及地震相分析,绘制东部凹陷沙河街组不同层序的沉积相平面展布图.根据东部凹陷沙河街组沉积相空间展布及演化规律,结合沉积相分布控制因素分析,提出东部凹陷沙河街组沉积相模式,盆地陡坡带短距离搬运的沉积物质在陆上堆积形成冲积扇,进入水体发育扇三角洲、浊积扇体等;缓坡带沉积物搬运距离相对较远,多发育辫状河—辫状河三角洲等远源沉积体系.     

鄂尔多斯盆地子长地区延长组深水砂岩露头精细解剖

鄂尔多斯盆地子长地区广泛出露延长组长1油层组深湖相浊积砂岩,在露头观测的基础上对其进行了构型单元分析。研究区长1油层组内可见7种岩相类型,分别为块状砂岩相(Sm)、具撕裂屑块状砂岩相(Smt)、平行层理砂岩相(Sh)、沙纹交错层理粉砂岩相(Fr)、同生变形构造粉砂岩相(Fd)、水平层理粉砂岩相(Fl)与块状泥岩相(Fm);识别出水道(CH)、堤岸(LV)和朵体(LB)3种不同类型的构型单元。根据水道构型单元垂向上的岩相组合和空间分布特点,将水道分为4类,对应于浊积扇体的不同部位:在上扇区域,主要发育Ⅰ类水道(Smt-Fm-Sm),砂体横向延伸有限;在中扇区域,主要发育Ⅱ类水道(Sm-Sh-Fr-Fl-Fm)与Ⅲ类水道(Sm-Fr-Fl-Fm),这两类砂体延伸性较好,是子长地区长1油层组深水砂体的主要组成部分;在下扇区域,发育Ⅳ类水道(Sm-Fl-Fm)。根据水道类型的差别探索提出子长地区长1油层组深水砂体沉积模式。     

贝尔凹陷南屯组钙质泥岩地质成因及其石油地质意义

根据测井、地震及实验分析数据,分析贝尔凹陷南屯组优质烃源岩-钙质泥岩层的识别特征和地质成因.结果表明,钙质泥岩层具有高自然伽马、高电阻率、高声波时差、低密度的"三高一低"响应,在地震剖面上为连续强反射;该层形成于广阔湖盆、微咸水、深水沉积环境,沉积稳定且范围广,是凹陷重要的地层对比标志层;岩性主要为灰黑色泥岩,局部夹杂油页岩和泥灰岩,富含钙质(主要为碳酸盐矿物,其次为介形虫等生物化石)和藻类,有机质类型为Ⅱ1-Ⅰ型,丰度高,是凹陷最优质的烃源岩层.该层与南屯组低水位域湖底扇和高水位域扇三角洲前缘进积扇体形成最有利的成藏组合,油气最为富集,其平面展布范围控制油气的平面分布,为贝尔凹陷等断陷盆地的油气勘探提供新认识.     

酒泉盆地营尔凹陷下沟组沉积特征及其控制因素

营尔凹陷白垩系下沟组是目前酒泉盆地油气勘探中寻找岩性油气藏最有利的层段之一,对其沉积体系展开系统的研究可为下一步勘探部署提供重要的指导。综合运用岩心、测井、录井等资料,对营尔凹陷下沟组的沉积体系展开了细致的鉴别和演化特征研究,结果表明,下沟组主要发育4种沉积体系:辫状河三角洲沉积体系、扇三角洲沉积体系、湖底扇沉积体系和湖泊沉积体系。辫状河三角洲主要发育于凹陷的西北部缓坡带,越过长2断层坡度变陡、湖盆加深,演化为湖底扇沉积体系。扇三角洲发育于研究区东北、东南和西南部的陡坡背景下,湖相沉积主要发育于北部次凹和南部次凹。沉积体系演化可以划分为3个阶段:下沟组一段沉积时期湖盆快速充填阶段;下沟组二段沉积时期湖盆扩张阶段;下沟组三段沉积时期稳定的三角洲沉积阶段。进一步研究表明,沉积体系类型及展布范围受到不同类型的同沉积断裂及其组合样式的控制,而物源发育和砂体展布样式则受到传递带的影响。      

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail     

Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Foreword

正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a