利用测井技术评价松辽盆地南部油页岩   总被引：9，自引：1，他引：8  

贺君玲  邓守伟  陈文龙  贾裕鲲  高金琦 《吉林大学学报(地球科学版)》2006,36(6):909-914

为了利用松辽盆地南部已有钻井的测井资料评价油页岩,分析了松辽盆地南部嫩二段油页岩的测井响应特征,充分利用测井资料连续性的优势,采用5口井93块油页岩岩心的有机碳、含油率化验分析数据和测井响应特征,建立嫩二段油页岩的有机碳含量与含油率之间定量关系式T^a=0.548 6TOC+0.18和△logR、自然伽玛与有机碳含量之间的定量关系式TOC=6.262 8×△logR+1.05,进而建立利用测井资料定量评价油页岩含油率模型T^a=0.546 8a×△logR＋0.548 6×△TOC＋0.18。通过模型计算出的油页岩段的含油率与油页岩实测含油率数据基本一致,而且计算出的含油率值连续。  相似文献   

白云鄂博赋矿白云岩与微晶丘和碳酸岩墙的碳氧同位素对比研究   总被引：26，自引：7，他引：19  

杨晓勇  章雨旭  郑永飞  杨学明  徐宝龙  赵彦冰  彭阳  郝梓国 《地质学报》2000,74(2):169-180

本文通过方解石和白云石的碳和氧同位素分析,对比研究了白云鄂博赋矿白云岩、黑脑包微晶丘、北京西山微晶丘、宽沟北正常沉积灰岩和白云鄂博碳酸岩墙,从而探讨了赋矿白云岩的成因及其与超大型Fe-Nb-REE矿床的成因关系。结果为:①黑脑包腮林忽洞群顶部微晶丘和北京西山寒武系顶部微晶丘碳酸盐的δ~(13)C值都在0±2‰左右,δ~(18)O值为18.3‰～25.1‰,均具有典型海相沉积碳酸盐岩的特点;②白云鄂博东矿采场δ~(13)C值为-7.9‰～-1.1‰,δ~(18)O值为9.1‰～20.9‰;矿区东西两端δ~(13)C值-7.9‰～-0.6‰,δ~(18)O值8.6‰～25.7‰;均介于地幔流体与典型沉积碳酸盐岩之间。部分赋矿白云岩样品中白云石与方解石之间的碳氧同位素分馏△~(13)C和△~(18)O值均小于0‰,表明其受到过次生蚀变作用,低δ~(18)O值白云石样品所对应的负△~(18)O值反映了地幔镁质流体对沉积碳酸盐岩的强烈交代作用;③矿区—富稀土碳酸岩墙的δ~(13)C值为-7.2‰～-4.7‰,δ~(18)O价值为11.9‰～16.4‰,表明其碳酸岩岩浆并非原始地幔来源,而可能与俯冲板块携带的沉积碳酸盐岩与地幔流体在深部的高温混合熔融有关。碳酸岩墙中白云石与方解石之间的碳和氧同位素分馏均小于0‰,说明该碳酸岩墙中的白云石与方解石并非同成因矿物,至少其中之一为  相似文献   

植物中单体烷烃碳同位素组成与其生长环境的关系   总被引：3，自引：0，他引：3  

李玉梅  陈践发 《地质学报》2000,74(3):273-278

用色谱一同位素质谱议对青藏高原东北部高寒草甸生态系统中的两种高等模特一火绒草（Ｌｅｏｎｔｏｐｏｄｉｕｍ ｌｅｏｎｔｏｐｏｄｉｏｉｄｉｅｓ）和蒲公英（Ｔａｒａｘａｃｕｍ ｍｏｎｇｏｌｉｕｍ）的烷烃进行分析,讨论环境因素对植物单体烷烃碳同位素组成（δ＾１３Ｃｉａ）的影响。研究发现,两种植物奇碳数正构烷烃的δ＾１３Ｃｉａ值都比较小,且有随海拔高度的增加而增大的趋势,而偶碳数正构烷烃的δ＾１３Ｃｉａ值可能  相似文献   

Methane exchange between coal-bearing basins and the atmosphere: the Ruhr Basin and the Lower Rhine Embayment, Germany   总被引：1，自引：0，他引：1  

Thomas Thielemann  Andreas Lücke  Gerhard H. Schleser  Ralf Littke   《Organic Geochemistry》2000,31(12):121

A precise knowledge of methane exchange processes is required to fully understand the recent rise of atmospheric methane concentration. Three of these processes take place at the lithosphere/atmosphere boundary: bacterial consumption of methane and emission of bacterial or thermogenic methane. This study was initiated to quantify these processes on a regional scale in the Ruhr Basin and the Lower Rhine Embayment. Since these areas are subject to bituminous coal and lignite mining, natural and anthropogenically-induced methane exchange processes could be studied. The methane emission and consumption rates and their carbon isotope signal were measured at the lithosphere/atmosphere boundary using flux chambers. On most of the soils studied, methane consumption by bacteria was identified. Thermogenic methane was released only at some of the natural faults examined. In active and abandoned bituminous coal mining areas methane emissions were restricted to small areas, where high emission rates were measured. The carbon isotope composition of methane at natural faults and in mining subsidence troughs was typical of thermogenic methane (−45 to −32 ‰ δ¹³C). Methane exchange balancing revealed that natural methane emissions from these two basins represent no source of atmospheric importance. However, methane release by upcast mining shafts dominates the methane exchange processes and is by about two orders of magnitude greater than methane consumption by bacterial oxidation in the soils.  相似文献   

Binary gas adsorption/desorption isotherms: effect of moisture and coal composition upon carbon dioxide selectivity over methane   总被引：6，自引：0，他引：6  

C. R. Clarkson  R. M. Bustin 《International Journal of Coal Geology》2000,42(4)

The effect of coal moisture content and composition upon methane/carbon dioxide mixed gas adsorption characteristics is investigated. Separation factors are used to quantify the relative adsorption of carbon dioxide and methane. Experimental data indicate that carbon dioxide separation factors vary slightly between coal lithotypes, but the effects of variable coal composition and moisture upon selective adsorption are difficult to isolate. Model predictions based upon single-component isotherms show that although some variability in carbon dioxide selectivity exists for different coal types, there is no clear relationship between coal composition and carbon dioxide selectivity. Model predictions also indicate that coal moisture decreases carbon dioxide selectivity. The ideal adsorbed solution (IAS) theory and the extended Langmuir model differ substantially in their ability to predict binary gas adsorption behaviour. Comparison of model predictions to experimental data demonstrates that IAS theory, in conjunction with the Dubinin–Astakhov single-component isotherm equations are more accurate for the prediction of mixed gas desorption isotherms collected in this study than the extended Langmuir. IAS predictions, however, are strongly dependent upon the choice of pure gas isotherm equation.  相似文献   

Is there a stable isotope evidence for the CO2 fertilization effect?     

R. V. Krishnamurthy  M. Machavaram 《Journal of Earth System Science》2000,109(1):141-144

It has been suggested that part of the so-called “missing sink” of carbon dioxide introduced into the atmosphere by anthropogenic activities, that is the imbalance between estimated anthropogenic carbon dioxide emissions and oceanic uptake, may be stored in the vegetation in midlatitudes. Precise mechanisms of abstraction of additional carbon dioxide by vegetation, also known as the “fertilization effect”, are poorly understood. Stable carbon and hydrogen isotope ratios of cellulose extracted from annual growth rings (covering the time period 1980–1993) in an oak tree from Kalamazoo, SW Michigan provide a basis to investigate at a physiological level how the fertilization effect may operate. The carbon isotope ratios show that the intercellular concentration of carbon dioxide increased due to an increase in stomatal opening. Although increased intercellular concentration of carbon dioxide translated to increased Water Use Efficiency and assimilation rates, it also resulted in increased transpiration rate as shown by higher D/H of the fixed carbon. The two-fold significance of the isotope data are: first, they provide the first field evidence based on isotope studies for excess CO₂ induced biomass production and second, they suggest that this mechanism is likely to operate only in limited environments. Vegetation in regions where moisture availability is not restricted so that there can be a gain in water use efficiency despite increased leaf evaporation are best suited to sequester excess carbon from the atmosphere.  相似文献   

白云鄂博富稀土元素碳酸岩墙的 碳和氧同位素特征   总被引：7，自引：0，他引：7  

杨学明  杨晓勇  郑永飞  郭范  张兆峰  张培善  M.J. Le Bas 《高校地质学报》2000,6(2):205-209

重点解剖了一条距白云鄂博超大型REE-Nb-Fe矿床东矿北东方向2 k m、切割白云鄂 博群H1及H3岩性段的细粒方解石碳酸岩岩墙的碳和氧同位素地球化学特征。结果表明,碳酸 岩的碳同位素组成变化范围较小(δ13C值为－6.6‰ ～ －4.6‰),与正常地幔碳δ 13C值－5±2‰一致;而氧同位素组成变化范围较大(δ18O值为11.9‰～17.7‰ ),显著高于地幔的δ18O值5.7±1.0‰,表明碳酸岩浆在结晶过程中或之后曾与 低 温热液流体发生了同位素交换。碳酸岩墙中白云石与方解石之间的碳和氧同位素分馏均小于 0‰,处于不平衡状态,说明该碳酸岩墙中的白云石与方解石并非同成因矿物,白云石可能 为次生成因的。  相似文献   

湖北宜昌地区寒武系—下奥陶统的碳氧同位素记录   总被引：10，自引：0，他引：10  

冯洪真  刘家润  施贵军 《高校地质学报》2000,6(1):106-115

对宜昌地区寒武系和下奥陶统的碳酸盐碳、氧同位素进行测定,所得δ18O大 于－10‰且与δ13C不相关,表明研究区碳酸盐样品基本上保存了碳、氧同位素的初 始比值。δ18O在白云岩样品中呈现正漂移而在非白云岩样品中呈现负漂移,认为δ 18O反映海水古盐度变化,即δ18O随着古盐度升高而增大;δ13 C在缺氧沉积物中呈现负漂移,但负漂移的δ13C却不限于缺氧沉积物,推测δ13 C可能反映古海洋的初级生产力,即δ13C随着初级生产力的提高而降低。研究还指 出,由于Z值与δ13C密切正相关（相关系数为0.99）,综合运用δ18O和δ 13C的经典盐度公式不适用于研究区古盐度环境的重建。  相似文献   

CO2-rich thermomineral groundwater in the Betic Cordilleras, southeastern Spain: Genesis and tectonic implications     

J. C. Cerón  M. Martín-Vallejo  L. García-Rossell 《Hydrogeology Journal》2000,8(2):209-217

The CO₂-rich thermal groundwater in the Betic Cordilleras in Spain has been studied with regard to the geological and hydrogeological setting, physical and chemical characteristics, and ¹³C-isotope content. The study area is about 60 km northeast of Almería city, in southeastern Spain. The thermomineral waters are plentiful and are related to regional geothermal anomalies. Temperatures of 20 −41°C, high bicarbonate concentrations (183–1824 mg/L), and high amounts of PCO₂ (<1.1 bar) characterize the groundwater. CO₂ spatial variations are related to proximity to the Carboneras, Palomares, and Guadalentín fault systems, which may be the surface representation of the zone of crustal thinning and magmatism. δ ¹³C values probably indicate a deep source for the CO₂, either the mantle or perhaps carbonate rocks in the metamorphic substratum. The high amount of CO₂ in the groundwater causes problems in wells and severely restricts water usage. The hydrothermal features of this area are probably related to neotectonic activity. Received, September 1998/Revised, June 1999, September 1999/Accepted, December 1999  相似文献   

RESPONSES OF A GLOBAL CGCM TO CO₂ INCREASE          下载免费PDF全文

LI Qingquan  Scott B. POWER 《Acta Meteorologica Sinica》2000,14(1):46-60

The responses of the climate system to increase of atmospheric carbon dioxide(CO₂)arestudied by using a new version of the Bureau of Meteorological Research Centre(BMRC)globalcoupled general circulation model(CGCM).Two simulations are run:one with atmospheric CO₂concentration held constant at 330 ppm,the other with a tripling of atmospheric CO₂(990 ppm).Results from the 41-year control coupled integration are applied to analyze the mean state,seasonal cycle and interannual variability in the model.Comparisons between the greenhouseexperiment and the control experiment then provide estimations of the influence of increased CO₂on climate changes and climate variability.Especially discussed is the question on whether theclimate changes concerned with CO₂ inerease will impact interannual variability in tropical Pacific,such as ENSO.  相似文献