南鄱阳坳陷乐探1井原油树皮煤成油的地球化学特征   总被引：1，自引：1，他引：1  

杨斌  马孝祥  周松源  覃军  唐协华 《海相油气地质》2005,10(3):31-35

南鄱阳坳陷二甲村凹陷乐探1井在上白垩统周家店组发现油气显示。其原油的地球化学特征与新疆非树皮煤成因的煤成油对比表明,它既具有煤成油的一般特征(如原油物性、族组分、姥植比、碳同位素特征),又有树皮煤的特殊性(如轻烃甲基环己烷指标、规则甾烷和萜烷的组成特征等),由此认为该井原油主要是由树皮煤形成的煤成油,它与本区广泛分布的海相二叠系龙潭组树皮煤有亲缘关系。  相似文献   

长江源各拉丹冬地区上三叠统结扎群双壳类组合与古环境   总被引：1，自引：0，他引：1  

汤朝阳  王新昆  姚华舟  牛志军  段其发  赵小明  王建雄 《新疆地质》2006,24(3):239-243

在长江源各拉丹冬地区雀莫错一带上三叠统结扎群采获大量双壳类化石,根据产出层位,建立了Quemocuomegalodon orientus-Neomegalodon boeckhi、Halobia superbescens-Halobia disperseinsecta、Amonotis togtonheensis-Cardium(Tulongocardium)xizangensis3个组合.这一生物组合反映的地质时代为诺利期,依据双壳类化石的外部形态和内部构造特征及围岩岩石化学分析,说明垂向上双壳类生活的结扎群具浅—深—浅的古地理变化特征,为区域上地层对比及生物生存环境提供了基础资料.  相似文献   

滇东岩溶区表层岩溶水源地特征及其开发利用   总被引：1，自引：0，他引：1  

彭淑惠  李继红 《云南地质》2006,25(2):249-255

表层岩溶水源地是解决分散农村生活用水困难的重要水源，而且分布广泛，水质较好。但水源地含水介质的富水性不均匀，岩溶水动态变幅大，脆弱性突出，易受污染和生态环境变化的影响。由此，表层岩溶水源地生态环境建设及保护尤为重要。表层泉以池、管调蓄系统开发最为有效。表层富水块段适宜打浅井开发，建设庭院式供水工程。采用地质雷达验证地质认识，确定井位，是经济有效的技术手段。  相似文献   

西藏达金海相碎屑岩的组成、地球化学特征及其构造背景     

闫臻方爱民  潘裕生李继亮刘小汉  俞良军 《岩石学报》2006,22(4):949-960

达金海相碎屑岩出露于西藏冈仁波齐峰山脚下,长期以来,该套岩石与冈底斯砾岩一起被视为印度-亚洲板块碰撞形成的陆相磨拉石.该套岩石组合是由凝灰质粉砂岩、杂砂岩、含砾杂砂岩和砾岩组成的一套深海-浅海相沉积组合.杂砂岩、砾岩碎屑组成与地球化学组成研究表明,该套岩石组合的形成与岛弧的发展密切相关,源区大地构造背景以岛弧为主,但也存在被动大陆边缘和碰撞构造带（蛇绿混杂带）两个不同构造背景的源区.区域上,在该套岩石组合的北侧存在着冈底斯岛弧带,南侧为雅鲁藏布蛇绿混杂带.这些特征共同表明,达金海相碎屑岩是西藏雅鲁藏布缝合带与冈底斯岛弧带之间的日喀则弧前盆地的一部分.  相似文献   

南陵—无为地区下三叠统海相烃源岩评价与标定   总被引：3，自引：0，他引：3  

曾艳涛  文志刚  宋换新 《海相油气地质》2006,11(4):34-38

南陵—无为地区包括无为盆地和南陵盆地两个主要构造单元,下三叠统为其重要的烃源岩层位之一,自下而上划分为殷坑组、和龙山组以及南陵湖组。在巢湖平顶山剖面共采集三个组的样品74块。分析结果表明有机质丰度整体偏低(<0.4%),但有三个层段达到了中等—好的烃源岩标准,累计厚度25～30m。该区有机质类型以腐泥型占绝对优势,且烃源岩整体处在成熟热演化阶段。  相似文献   

The impact of radio source structure on European geodetic VLBI measurements     

V. Tornatore  P. Charlot 《Journal of Geodesy》2007,81(6-8):469-478

European geodetic very long baseline interferometry (VLBI) sessions (also known as EUROPE sessions) have been carried out on a regular basis for the past 15 years to study relative crustal motions within Europe. These sessions are based on observations of extragalactic radio sources, which serve as distant fiducial marks to establish an accurate and stable celestial reference frame for long-term geodetic measurements. The radio sources, however, are not always point-like on milliarcsecond scales, as VLBI imaging has revealed. In this work, we quantify the magnitude of the expected effect of intrinsic source structure on geodetic bandwidth synthesis delay VLBI measurements for a subset of 14 sources regularly observed during the EUROPE sessions. These sources have been imaged at both X-band (8.4 GHz) and S-band (2.3 GHz) based on dedicated observations acquired with the European VLBI Network (EVN) in November 1996. The results of this calculation indicate that the reference source 0457+024 causes significant structural effects in measurements obtained on European VLBI baselines (about 10 picoseconds on average), whereas most of the other sources produce effects that are only occasionally larger than a few picoseconds. Applying the derived source structure models to the data of the EUROPE5-96 session carried out at the same epoch as the EVN experiment shows no noticeable changes in the estimated VLBI station locations.  相似文献   

近几十年黄河源区气候与植被变化及相关分析   总被引：4，自引：5，他引：4  

柳媛普  吕世华  李锁锁  尚伦宇 《高原气象》2007,26(5):1045-1051

通过对黄河源区气温、降水量、NDVI指数变化以及NDVI指数与气温、降水量的相关性进行分析,结果表明:黄河源区气温近50年呈升高趋势;源区近34年年降水量呈减少趋势,20世纪80年代源区降水量较多,比较湿润。近20年黄河源区及源区东北部植被覆盖较差,且不容易保持,达日及源区东南部植被覆盖相对较好,且容易保持;源区植被覆盖与气温、降水量均呈正相关关系,降水量对植被覆盖的影响比气温的影响大。  相似文献   

伽师强震群震源特征及震源机制力学成因分析   总被引：32，自引：10，他引：22       下载免费PDF全文

周仕勇  许忠淮  陈晓非 《地球物理学报》2001,44(5):654-662

应用改进的主地震相对定位法对17年伽师强震群3级以上地震进行了精确定位,根据较强地震的空间分布和震源机制解推断出伽师震群的发震构造为北北西向的雁行断裂.根据伽师震群地震的2177个P波初动方向记录,计算了伽师震群的平均震源机制解.基于Silver的震源模型,由震源谱推断了伽师震群主要地震的破裂方向,破裂尺度及应力降.文中最后用右阶雁行断裂的数值模型计算了伽师震群的发震构造所产生的扰动应力场的空间分布图像,用其解释了序列地震震源机制的多样性和低应力降现象,并认为特定的雁行发震构造与强震的多发性有关.  相似文献   

羌塘盆地中生代古油藏油源问题探讨   总被引：3，自引：1，他引：2  

汪双清  沈斌  龚迎莉  孙玮琳 《海相油气地质》2008,13(3)

对羌塘盆地中生界共242个露头烃源岩样品以及6个油苗样品进行了正构烷烃碳数分布模式,多环芳烃系列相对含量组成,甾烷组成,甾、萜系列相对含量等多项测试对比研究。岩样分布于侏罗系索瓦组、夏里组、布曲组、色哇组、曲色组以及上三叠统肖查卡组这六套主要烃源岩层系,油样分布于雪山组、索瓦组、夏里组以及布曲组。布曲组烃源岩是多个不同地层古油藏的主要贡献者,是羌塘盆地的主力烃源岩层系之一;雪山组古油藏很可能另有主力油源层,它与所述的六套烃源岩均无可比性。  相似文献   

Characterization of Aquatic Dissolved Organic Matter by Spectral Analysis： From Watershed to Deep Ocean     

Weidong Guo  Chao Wang  Yan Li  Liyin Qu  Muchen Lang  Yongbin Deng  Qinglong Liang 《地球科学进展》1986,35(9):933-947

Since 1990s， spectral analysis has become an important technique to characterize the properties of chromophoric and fluorescent dissolved organic matter （CDOM and FDOM） from various aquatic systems and a series of spectral indices have been suggested to trace the sources of DOM and their biogeochemical regulation processes. DOM samples were collected from an aquatic continuum from watershed to deep ocean， i.e. Zhangjiang River and Estuary， Dongshan Bay， Taiwan Strait， Northeast basin of the South China Sea， Luzon Strait and the vertical profile of the Kuroshio region of the West Pacific Ocean. This continuum covered many critical interfaces （land-ocean， shelf-basin， marginal sea basin-open ocean and euphotic and aphotic layer）. The spatial distribution and variation of various qualitative and quantitative parameters along the continuum were clearly revealed. Combined with literature review， the sources and sinks of CDOM/FDOM and their inherent regulation processes under significant hydrological and biogeochemical gradient variation were systematically summarized. The geochemical differentiation of the quantitative DOM spectral index in various aquatic systems was discussed. The tracing ability of the qualitative DOM spectral index was commented. The coupling study of soil-river organic matter systems， mechanism of mineralization-related microbial production of CDOM/FDOM， quantified geochemical framework concept and perturbation of global change on CDOM/FDOM dynamics were suggested as future key topics.  相似文献