柴达木盆地东台吉乃尔盐湖盐类沉积特征及成盐年代的初步研究   总被引：3，自引：0，他引：3  

张辉  韩凤清  梁青生 《化工矿产地质》2001,23(2):83-85

东台吉乃尔盐湖经过长期的成盐演化和成矿过程 ,最终形成了以氯化钠化学沉积为主的蒸发盐 ,晶间卤水富含B、Li等多种元素卤水矿床 ,根据 1998年对该湖干盐滩中部所打的CK1孔钻孔剖面( 12m)及测试的几个14 C年龄 ,初步证实该盐湖上部盐层是在约 10 0 0 0aBP形成 ,未经碳酸盐和硫酸盐成盐阶段 ,盐湖形成初期即进入氯化物成盐阶段。  相似文献   

判断水淹程度的碳氧比能谱测井方法研究   总被引：5，自引：2，他引：5  

王祝文  刘菁华  李舟波  陆敬安  张建民  郭淑梅  王永成  赵志宇 《物探与化探》2001,25(1):37-39,44

碳氧比能谱测井方法是在套管井中用于划分油水层、确定含油水饱和度及岩性的一种有效方法。根据碳氧比能谱测井的原始谱线资料,提出了一种判断油层水淹程度的指数-水淹指数。通过实际资料验证,该指数对水淹程度有很好的判断作用,具有良好的应用前景。  相似文献   

Fluid-rock history of granulite facies humite-marbles from Ambasamudram, southern India.   总被引：1，自引：0，他引：1  

M. Satish-Kumar  H. Wada  M. Santosh  M. Yoshida 《Journal of Metamorphic Geology》2001,19(4):395-410

An extensive humite‐bearing marble horizon within a supracrustal sequence at Ambasamudram, southern India, was studied using petrological and stable isotopic techniques to define its metamorphic history and fluid characteristics. At peak metamorphic temperatures of 775±73°C, based on calcite‐graphite carbon isotope thermometry, the mineral assemblages suggest layer‐by‐layer control of fluid compositions. Clinohumite + calcite‐bearing assemblages suggest X_CO2 < 0.4 (at 700°C and 5 kbar), calcite + forsterite + K‐feldspar‐bearing assemblages suggest X_CO2>0.9 (at 790°C); and local wollastonite + scapolite + grossular‐bearing zones formed at X_CO2 of c. 0.3. Retrograde reaction textures such as scapolite + quartz symplectites after feldspar and calcite and replacement of dolomite + diopside or tremolite+dolomite after calcite+forsterite or calcite+clinohumite are indicative of retrogression under high X_CO2 conditions. Calcite preserves late Proterozoic carbon and oxygen isotopic signatures and the marble lacks evidence for extensive retrograde fluid infiltration, while during prograde metamorphism the possible infiltration of aqueous fluids did not produce significant isotopic resetting. Isotopic zonation of calcite and graphite grains was likely produced by localized CO₂ fluid infiltration during retrogression. Contrary to the widespread occurrence of humite‐marbles related to retrograde aqueous fluid infiltration, the Ambasamudram humite‐marbles record a prograde‐to‐peak metamorphic humite formation and retrogression under conditions of low X_H2O.  相似文献   

钢筋混凝土框架砖填充墙结构抗震性能的研究   总被引：12，自引：5，他引：12  

关国雄  夏敬谦 《地震工程与工程振动》1996,16(1):87-99

本文介绍了一个１／３比例框架填充墙结构模型模拟地震振动台试验，研究了结构动力特性与反应特征，提出了钢筋混凝土框架砖填充墙结构层间刚度与抗力的简化估计方法和公式，同时进行了多层框架填充墙结构的弹塑性动力反应分析并结合试验模型将计算结果与试验结果进行比较。  相似文献   

三江平原沼泽地碳循环初探   总被引：35，自引：1，他引：35  

马学慧  吕宪国 《地理科学》1996,16(4):323-330

在三江平原多年考察与研究的基础上，通过典型沼泽的定位观测，估算了三江平原沼泽土壤中的碳储量，探讨了沼泽植物对大气ＣＯ２的固定，碳素自沼泽土壤向大气的转移，沼泽近地气层ＣＯ２流，以及沼泽植物－土壤－大气之间的碳素流动。  相似文献   

吉黑东部斑岩型-浅成热液型铜金矿床多重成矿模型   总被引：5，自引：0，他引：5  

芮宗瑶  张洪涛  王龙生  陈仁义 《矿床地质》1995,14(2):174-184

通过四个典型矿床（小西南岔、闹枝、五凤和刺猬沟）的对比，发现它们在形成时间-空间一成因上既相互联系，又相互区别。小西南岔和闹枝矿床存在三个成矿流体系统：加热天水系统(A)、排放流体系统(B)、蒸气缕(steam plume)反应系统(C)；五凤和刺猬沟矿床只有一个成矿流体系统，即排放流体系统(B)。前者的成矿流体由浅成岩浆房的补给；后者的成矿流体主要为循环天水，浅成岩浆房的补给不明显。小西南岔金铜矿床产于中生代火山岩盆地边缘的隆起带，属于斑岩型矿床；闹枝金（铜）矿床产于中生代火山岩盆地内的断隆块，属于斑岩-浅成热液过渡型矿床；五凤和刺猬沟金（银）矿床产于中生代火山岩盆地内断裂带，属于浅成热液型矿床。在区域成矿上，由浅入深，浅成热液型斑岩-浅成热液过渡型和斑岩型构成多重成矿模型。  相似文献   

吉黑东部斑岩型－浅成热液型铜金矿床多重成矿模型   总被引：9，自引：2，他引：9  

芮宗瑶  张洪涛  王龙生  陈仁义 《矿床地质》1995,(2)

通过四个典型矿床（小西南岔、闹枝、五凤和刺猬沟）的对比，发现它们在形成时间－空间－成因上既相互联系，又相互区别。小西南岔和闹枝矿床存在三个成矿流体系统：加热天水系统（Ａ）、排放流体系统（Ｂ）、蒸气缕（ｓｔｅａｍｐｌｕｍｅ）反应系统（Ｃ）；五凤和刺猬沟矿床只有一个成矿流体系统，即排放流体系统（Ｂ）。前者的成矿流体由浅成岩浆房的补给；后者的成矿流体主要为循环天水，浅成岩浆房的补给不明显。小西南岔金铜矿床产于中生代火山岩盆地边缘的隆起带，属于斑岩型矿床；闹枝金（铜）矿床产于中生代火山岩盆地内的断隆块，属于斑岩－浅成热液过渡型矿床；五凤和刺猬沟金（银）矿床产于中生代火山岩盆地内断裂带，属于浅成熟液型矿床。在区域成矿上，由浅入深，浅成热液型斑岩－浅成热液过渡型和斑岩型构成多重成矿模型。  相似文献   

Elucidation of the Alum Shale kerogen structure using a multi-disciplinary approach     

Sunil Bharati  Richard L. Patience  Steve R. Larter  Guy Standen  Iain J. F. Poplett 《Organic Geochemistry》1995,23(11-12)

The significance and validity of integrating data obtained from a variety of analytical techniques to understand, elucidate and model kerogen's complex chemical structure is reported here using degradative (open and closed system pyrolysis, chemical oxidation), non-degradative (¹³C CP/MAS NMR) and optical (incident white light and blue light) methods. Seven Cambrian Alum Shale samples, ranging in maturity from immature to post-mature with respect to petroleum generation, were studied and were chosen for their simple geological history, uniform organic matter type and high organic carbon content. The Alum Shale kerogens, which primarily consist of algal organic matter, liberate low molecular weight gaseous and aromatic compounds on pyrolysis and give mostly branched dicarboxylic acids on chemical oxidation. ¹³C NMR spectroscopy shows that the Alum Shale kerogens are anomalously rich in oxygen-bearing functional groups (such as C = O, ArCO, CHO, CH_xO), most of which apparently remain intact within the kerogen macro-molecule (KMM) through the diagenetic and catagenetic stages. Fragments released by different degradative techniques are quantified and the aromaticity (f_a), O/C and relative proportions of various carbon types estimated by ¹³C NMR. A synthesis of these data has allowed us to better understand the chemistry of the Alum Shale kerogen.  相似文献   

生油岩评价专家系统研究     

丑晓伟  胡晓娥等 《甘肃地质》1993,2(2):75-83

生油岩评价专家系统(SREES)的建立是将有关地质学家的理论方法和经验知识进行系统总结,以先进的人工智能技术在计算机上实现,使生油评价分析工作达到专家水平,从而提高评价结果的置信度,更好地指导油气勘探工作。整个系统采用了自顶向下、面向目标的程序设计方法,使用C语言在Micro VAX机上实现,系统选择了民和盆地作为实验区,验证了系统的评价性能,在计算机系统支持下的陆相油气资源评价方法上作了一次偿试。  相似文献   

Global synchroneity of a positive carbon isotope excursion at the Cenomanian/Turonian boundary: Validation by calcareous microfossil biostratigraphy of the Yezo Group, Hokkaido, Japan     

Takashi  Hasegawa Tsunemasa  Saito 《Island Arc》1993,2(3):181-191

Abstract Isotopic analyses of organic carbon from the mid-Cretaceous sequence in Hokkaido, Japan, revealed a 2‰ positive excursion of δ¹³C values at the biostratigraphically defined Cenomanian/Turonian (C/T) boundary recognized in the Yezo Group. The planktonic foraminiferal Whiteinella archaeocretacea Zone, which is known to bracket the Cenomanian/Turonian boundary elsewhere in the world, was recognized in the Oyubari area of central Hokkaido based on the distribution of commonly occurring planktonic foraminifera. In the Tappu area of northwestern Hokkaido, where diagnostic planktonic foraminifera are rare but calcareous nannoplankton occur commonly, the interval coeval with the W. archaeocretacea Zone can also be established by recognizing the conjoined last appearance levels of Corollithion kennedyi and Axopodorhabdus albianus, both calcareous nannoplankton species. Carbon isotope profiles exhibit a similar pattern with comparable peaks and troughs occurring in the same stratigraphic position in the sequences. A prominent, positive 2‰ shift of δ¹³C values, here called ‘δ¹³C spike’ occurs in the middle of the W. archaeocretacea Zone in the Oyubari area and just above the conjoined last appearances of the two above-mentioned nannoplankton taxa in the Tappu area. The Cenomanian/Turonian boundary can be drawn just above the peak position of the spike in both sections. The Rock Eval analyses and biomarker analyses of organic carbon indicate that organic carbon subjected to our isotope analyses is of terrestrial origin. Therefore, the observed 2%o shift should reflect changes in the isotopic composition of the atmospheric CO₂. A unique layer composed predominantly of sand-grain sized spumellarian Radiolaria is present immediately above the δ¹³C spike both in the Oyubari and Tappu areas, suggesting an increasing availability of both nutrients and silica in surface waters.  相似文献