UNUSUAL DISTRIBUTION OF TRITERPANE AND STERANE TERRESTRIAL BIOMARKERS IN YACHENG CONDENSATES FROM YING-QIONG BASINS, SOUTH CHINA SEA   总被引：1，自引：0，他引：1  

周毅  盛国英  傅家膜  耿安松  陈军红  张启明  潘贤庄  黄保家 《中国海洋湖沼学报》2002,20(2):182-190

The condensates from the Yacheng Gas Field, Ying-Qiong Basins, have unusual chemical characteristics, with distribution dominated by terpanes and steranes derived from higher-plants. Pr/Ph ratios (6- 11 ) are very high. Drimane, cadinanes and homocadinanes exist in high concentration. Anomalously abundant 18α(H)-oleanane and remarkably abundant bicadinanes are present in Yacheng condensates, while 17α( H)-hopanes are in extremely low concentration. Taraxastane and significantlyabundant 17α(H)-diabopanes occur in the condensates. In addition, a number of C29 and C30 unknown pentacyclic triterpanes were monitored in the condensates, some of which are abundant. The unknown compounds may be terrestrial biomarkers or their occurrence may suggest a sub-oxic (dyacrobic) clay-rich depositional environment. C29 homologues are relatively predominant in regular and rearranged steranes. The concentration of diasteranes is markedly higher than that of regular steranes. The characteristics of Yacheng condensates are indicative of terrestrial source input. Based on condensate-condensate and con-densate-rock correlations, combined with results of studies on sedimentary facies. Yacheng condensates may be sourced from Yacheng and Lingshui Formations in the Qiongdongnan Basin. The maturity of Yacheng condensate is relatively high, at late oil window stage ( corresponding to 0.9 % - 1.3 % R0 ),based on sterane and terpane maturity parameters.  相似文献   

The Formation, Movement and Evolution Pattern of Jurassic Terrestrial Deposit Basin in Daqingshan Region     

Peng Xiangdong  XU Zhongyuan  LIU Zhenghong 《世界地质(英文版)》2001,4(2)

The authors have reconstructed the original shape of Jurassic basin in Daqingshan region and discussed the movement and evolution pattern of the basin. The basin developed between Paleozoic strata sliver and metamorphic rock sliver in late stage of Early Jurassic and extended in latitude direction. The palco - terrene of the basin is higher in north and west than south and east. The boundary of basin is largest in Changhangou stage of Middle Jurassic. After middle Jurassic, the region took place Yenshan movement, and then the basin changed obviously from weakly extending environment of Early and Middle Jurassic to extruding environment of late Jurassic, and the paleoclimate of the basin changed from warmth and wetness to dry. The basin finished the evolution history in the late stage of Late Jurassic with the development of thrust.  相似文献   

The Formation, Movement and Evolution Pattern of Jurassic Terrestrial Deposit Basin in Daqingshan Region     

《东北亚地学研究》2001,(2)

  相似文献   

An estimation of groundwater storage variations from GRACE gravity satellites in the Heihe River Basin, northwestern China     

YanPing Cao  ZhuoTong Nan  XingLin Hu 《寒旱区科学》2014,6(6):0577-0586

There are only limited surface water resources available in the Heihe River Basin （HRB）, a typical inland river basin in the arid region of northwestern China, where groundwater overexploitation is a serious problem. Groundwater has become one of main resources of fresh water in the HRB. In this paper, temporal and spatial variations of groundwater in the HRB are estimated by the Gravity Recovery and Climate Experiment （GRACE） satellites. Our analysis shows that groundwater storage in the HRB reaches its highest in the summer of 2005, and then begins to decline in the following years and reaches steady status in 2008. Spatially, groundwater shows a decline in the upper HRB in the first two years and a slight increase in the following years, while this phenomenon is reversed in the middle HRB where groundwater slightly increases in 2005 and then declines in the following three years. In the lower HRB, GRACE detects a continual increase in the full six-year period. This approach is proven successful when employed in the HRB and thus offers a new insight into monitoring groundwater variations in a river basin with limited or even without any observed data.  相似文献   

工业遗址风貌三维景观精细化测绘关键技术研究     

文衍宁 《测绘与空间地理信息》2017,40(9)

以广钢新城地块工业遗址风貌区测绘为试点,将GZCORS、地面Li DAR、轻型无人机Li DAR等先进快速测绘设备有效组合,地空一体化快速测绘,实现遗址风貌区构筑物数字化快速采集、建模,丰富了测绘信息表达内容与形式,为规划决策提供新型智力支持。本文针对工业遗址历史风貌区构筑物快速数字化提供了一套完整的技术方案。  相似文献   

北极海冰与赤道东太平洋海温的相互影响及其与El Nino的联系   总被引：6，自引：0，他引：6  

钱步东  范钟秀  彭公炳  周恩济 《热带气象学报》1994,10(4):325-334

对北极海冰面积与赤道东太平洋海温作了交叉相关分析，揭示了北极海冰与赤道东太平洋海温间相互影响的关系及其时空特点，并讨论了Ｅｌ Ｎｉｎｏ与北极海冰间的联系。结果表明，北极Ⅴ－Ⅵ区冬季海冰面积能够对以后冬季的赤道东太平洋海温产生持续的影响，而北极Ⅶ区夏秋季的海冰面积能够影响来年夏秋季的海温；赤道东太平洋海温对海冰的影响表现为前期海温能够影响北极Ｉ区春季海冰的消融。此外，前期北极海冰状况对Ｅｌ Ｎｉｎｏ  相似文献   

Comparison of airsea fluxes of CO₂ in the Southern Ocean and the western Arctic Ocean   总被引：1，自引：0，他引：1  

CHEN Liqi  GAO Zhongyong  YANG Xulin  WANG Weiqiang 《海洋学报(英文版)》2004,23(4):647-653

The data were collected during Chinese Arctic and Antarctic Expeditions in the western Arctic Ocean and the marginal sea ice zone (MSIZ) of the Southern Ocean, respectively in the boreal summer from July to September of 1999 and in the austral summer from December of 1999 to January of 2000. The concentrations of CO2 in surface water of the survey regions would mostly present lower than those in the atmosphere. A significant biological driving force could also been observed in summer waters in both of the above oceans. Air to sea CO2 fluxes were also calculated to compare oceanic uptake capacity of CO2 in both oceans with the world oceans using Liss, Wanninkhof, and Jacobs‘s methods. The averaged CO2 fluxes of air to sea in the western Arctic Ocean or in the MSIZ of the Southern Ocean doubled that in the world oceans.  相似文献   

东亚夏季风年际变率及其与中、高纬度大气环流以及外强迫异常的联系   总被引：8，自引：2，他引：6  

武炳义  张人禾 《气象学报》2011,69(2):219-233

利用欧洲中心35年(1968-2002年)月平均再分析资料(ERA-40),通过矢量经验正交分析方法,研究了东亚夏季风年际变率的第2、3优势模态及其与中、高纬度大气环流和外强迫异常之间的联系.这两个优势模态均与北半球中、高纬度大气环流异常有密切的关系,累计解释协方差超过了东亚夏季风的第1模态.东亚夏季风变率的第2模态解...  相似文献   

Searching for travertines, calcretes and speleothems in deep time: Processes, appearances, predictions and the impact of plants   总被引：2，自引：0，他引：2  

A.T. Brasier 《Earth》2011,(4):213-239

Common models for modern calcite precipitation in and around caves, soils, springs and streams involve CO₂ supplied by thick, high pCO₂ biogenic soils which were probably thin or non-existent before vascular plants. Indeed plant-influenced chemical weathering might have caused accelerated terrestrial carbonate production from the Devonian onwards. However terrestrial carbonates have also been documented from the Archaean, Proterozoic, Cambrian, Ordovician and Silurian. Mechanisms which could have caused non-marine carbonates to precipitate without organic-rich soils are described, and some geological events likely to have influenced non-marine carbonate precipitation up to the origin of vascular plants are highlighted. As organisms have evolved, so have the petrographic characteristics of non-marine carbonates; some examples of this are also given here.  相似文献   

北极海冰数值预报的初步研究——基于海冰—海洋耦合模式MITgcm的模拟试验   总被引：4，自引：0，他引：4  

杨清华  刘骥平  张占海 《大气科学》2011,35(3):473-482

利用最近发展的MITgcm(麻省理工学院通用环流模式)海冰-海洋耦合模式,以NCEP(美国国家环境预测中心)再分析资料为大气强迫场进行了1992年1月至2009年12月北极海冰数值模拟.结果表明,此模式能很好地模拟卫星观测的北极海冰季节和年际变化,具备很好的北极海冰数值模拟能力.以此为基础,对2009年7月和10月北极...  相似文献