加快南方油气勘探的几点认识     

谢展 《海相油气地质》1997,2(3):6-10

南方石油地质条件“先天国内第一，后天国内最差”。南方未变质的沉积岩自晚元古代的震旦纪至新生代的第三纪沉积齐全，厚度很大，油源丰富，油气苗遍布，含油气远景乐观。但由于印度、欧亚和太平洋三大板块的活动，受力交点在南方，且构造运动强烈、断层密集、强度又大，勘探条件极为困难，风险大，南方具有勘探价值的地区有十七块。即阜阳黄口、合肥、苏经－同、皖南、萍乡－乐平、弋阳－吉安、浙闽东部火山岩覆盖区、江汉、秭归、  相似文献   

矿产预测专家系统及其在新疆铜—镍硫化物矿床中的应用     

肖树建  武润亭 《地质论评》1997,43(2):210-216

系统地使用综合地质，地球物理、地球化学信息预测深部岩浆铜－镍硫化物矿床的找矿预测专家系统，已在新疆哈密地区香山岩体上就用并取得明显效果，设计的两个验证钻孔都已打到矿体。  相似文献   

Aeolian Facies Belts in the Taklimakan Desert   总被引：4，自引：0，他引：4  

Li Baosheng  Dong Guangrong  Zhang Jiasheng  Li Sen  Jin Heling  Chen Huizhong  Wen Xiangle  Wang Yao  Lanzhou Desert Research Institute  Chinese Academy of Sciences  Lamhou  Gansuand Zhu YizhiXi''an Open Laboratory of Loess  Quaternary Geology  Chinese Academy of Sciences  Xi''an  Gansu Fei Zhenbi 《《地质学报》英文版》1995,69(3)

At least at the beginning of the last glacial epoch, the facies belts of dune sand, sandy loam and loess formed by winds had existed in the Taklimakan desert and areas south of it. There were no appreciable changes in the NE and NW wind systems and their wind fqrces that deposited dune sand, sandy loam and loess in the global cold stage since the last glacial epoch (accordingly no marked shifts of the boundaries of these aeolian facies belts took place. In the global warm stage since then, the climate in the Taklimakan desert and areas south of it became warm and dry, resulting in ablation of substantial volumes of ice and snow in their surrounding mountains and thus forming alluvial and diluvial deposits in the region. The alluvial-diluvial actions, however, failed to change the general framework of aeolian facies belts.  相似文献   

THE MEANDER OF KUROSHIO AND OSCILLATION IN A COUPLED OCEAN-ATMOSPHERE MODEL   总被引：3，自引：0，他引：3       下载免费PDF全文

刘秦玉  徐启春  王志联  秦曾灏 《Acta Meteorologica Sinica》1993,(3)

A numerical experiment of an asynchronous coupled ocean-atmosphere model has been described in this paper.Atwo-layer global atmosphere general circulation model(OSU/IAP-AGCM)and a two-layer North Pacific Oceangeneral circulation model(NPOGCM)developed by Liu et al.(1992)are used in numerical experiment.The sea surfacetemperature anomaly(SSTA)corresponding to the meander of the Kuroshio is treated as the initial perturbation in thePacific Ocean and the abnormal phenomena caused by the disturbance and the interaction between atmosphere andocean,have been studied.The numerical experiment showed that the SST anomaly in the North Pacific could induce a new 30—60 dayoscillation through the coupling between atmosphere and ocean and the interaction between the meander of theKuroshio and atmosphere circulation is a positive feedback process.  相似文献   

两广大陆地区酸雨的时空分布规律和化学特点   总被引：3，自引：0，他引：3  

齐立文 《气象》1993,19(11):8-12

自１９８８年１月至１９８９年１２月，建立了一个包括７０个监测点的酸沉降测网，进行了常规的干，湿沉降同步观测，获得了大量的监测数据，结果表明：两广地区大面积出现酸雨，酸雨污染较严重地区是广东省粤北和珠江三角洲及广西的“汀桂走廊”。这些地区经济发展迅速，又是ＳＯ２，ＮＯｘ排放量较多的地区。降水酸度季节分布明显，即：春季＞冬季＞秋季＞夏季。降水中主要离子是Ｃａ＾２＋，ＮＨ＾＋４和ＳＯ＾２－４，化学组成以  相似文献   

中国几个盆地原油轻烃单体和正构烷烃系列分子碳同位素研究   总被引：11，自引：0，他引：11  

张文正  裴戈  关德师  程坤芳 《地质论评》1993,39(1)

本文采用最新的GC/C/MS在线碳同位素分析技术,分析研究了鄂尔多斯、四川、塔里木等盆地原油及凝析油轻烃单体和正构烷烃系列分子碳同位素特征及分布模式。探讨了不同结构烃分子及同结构不同碳数烃分子之间碳同位素分配的某些规律。研究了一些典型成因原油轻烃单体和正构烷烃系列分子碳同位素特征及分布模式,为该项新技术在油气研究与勘探中的应用奠定了基础。同时在一些原油的成因上取得了新认识。  相似文献   

甘肃临夏黄土剖面：15万年环境演变的良好记录   总被引：13，自引：1，他引：13  

康建成  李吉均 《地质论评》1993,39(2):165-175

历经15万年的甘肃临夏北塬黄土剖面,沉积速率大、古土壤序列完整。特别是在距今14—8万年的末次间冰期形成的三层古土壤,末次冰期间冰段形成的数层弱成土型古土壤,其特征优于其它黄土剖面。对北塬剖面磁化率、孢粉、粒度、地球化学特征的综合研究表明,该剖面完整地记录了15万年以来的环境变化,为检验以往从大陆冰盖和深海沉积中得出的环境变化模式提供了途径。  相似文献   

Qinling-Type Lead-Zinc Deposits     

Li Jianzhong  Gansu Institute of Geology for Non-Ferrous Metals  CNNC  Lanzhou  Gansu He Dianren North west Institute of Geology for Non-Ferrous Metals  CNNC  Xi''an  Shaanxi  Wu Jianmin Research Institute of Geology for Mineral Resources  CNNC  Guilin  Guangxi 《《地质学报》英文版》1993,67(1)

Qinling-type Pb-Zn deposits are located in the Qinling fold belt, occurring in the fine-clastic and carbonate rocks of the Devonian marine facies. They are reformed sedimentary deposits originating from hydrothermal waters, and may be subdivided into 2 subtypes: hydrothermal sedimentary deposits (Changba subtype) and reformed hydrothermal sedimentary deposits (Bijiashan-Qiandongshan subtype). In comparison with some of the famous Palaeozoic Pb-Zn deposits in the world, the Qinling-type Pb-Zn deposits constitute an independent type, which possesses some characteristics of both hydrothermal sedimentary deposits (Meggen type) and reformed hydrothermal deposits (Mississippi Valley type).  相似文献   

ADVANCES IN SECOND-ORDER CALIBRATION     

ODDS.BORGEN  BRUCER.KOWALSKI  FRANTSEK TURECEK 《地理学报(英文版)》1993,(2)

Several multivariate methods are now available for the calibration of second-order or hyphenatedinstruments(e.g.GC/MS).When applied to bilinear data,it has been shown that calibration can beperformed in the presence of unknown interferences-a significant advantage over first-order calibration.In this paper,non-bilinear rank annihilation(NBRA),a method which has the potential of handling,second-order non-bi-linear data,is studied through theoretical analysis and computer simulation.It isfound that the second-order advantage can be carried over to non-bilinear data if a property defined asnet analyte rank(NAR)holds for the analyte of interest.The net analyte signal(NAS)is definedaccordingly for second-order calibration and the analogy to and difference from lower-order calibrationare discussed.With NAS,some analytical figures of merit such as signal-to noise ratio,selectivity,sensitivity and limit of determination can be calculated for second order calibration.An application toMS/MS data is also given.  相似文献   

A TEST OF SIGNIFICANCE FOR PARTIAL LEAST SQUARES REGRESSION   总被引：1，自引：0，他引：1  

IAN N. WAKELING  JEFF J. MORRIS  AFRC Institute of Food Research  Earley Gate  Whiteknights Ro  Reading RG EF  U.K.Zeneca Pharmaceuticals  Mereside  Alderley Park  Macclesfiel  Cheshire SK TG  U.K. 《地理学报(英文版)》1993,(4)

Partial least squares (PLS) regression is a commonly used statistical technique for performingmultivariate calibration, especially in situations where there are more variables than samples. Choosingthe number of factors to include in a model is a decision that all users of PLS must make, but iscomplicated by the large number of empirical tests available. In most instances predictive ability is themost desired property of a PLS model and so interest has centred on making this choice based on aninternal validation process. A popular approach is the calculation of a cross-validated r~2 to gauge howmuch variance in the dependent variable can be explained from leave-one-out predictions. Using MonteCarlo simulations for different sizes of data set, the influence of chance effects on the cross-validationprocess is investigated. The results are presented as tables of critical values which are compared againstthe values of cross-validated r~2 obtained from the user's own data set. This gives a formal test forpredictive ability of a PLS model with a given number of dimensions.  相似文献