长江三角洲南通地区第四纪地层马尔柯夫链综合分析   总被引：2，自引：0，他引：2  

李仁平  匡有为 《地球科学》1989,14(2):213-219

本文简要论述了马尔柯夫链的基本方法,并试图利用此法对长江三角洲地区第四纪地层剖面作综合分析。文中以南通地区两个有代表性的钻孔剖面为例,采用马尔柯夫链极限概率分析、置换分析、熵分析、旋回类型分析和地层模拟,对两钻孔剖面作了综合对比分析。结果表明,马尔柯夫链分析方法是该区第四纪地层分析的一种行之有效的方法。  相似文献   

湖北利川晚二叠世长兴期生物礁中的鹦鹉螺化石及其生态意义     

吴顺宝  匡文 《地球科学》1992,(3)

川东、鄂西碳酸盐台地东缘,较广泛地发育着以海绵动物为骨架的生物礁。礁中有许多附礁生物,其中鹦鹉螺类化石在利川见天坝礁体中局部富集,共有8属9种,包括3个新种。根据现代鹦鹉螺的生态特征及当时区域沉积物的分布规律分析,工作区长兴期沉积环境是处在台地边缘,并接近斜坡相和盆地相。  相似文献   

矿物在超临界溶液中的溶解度理论计算   总被引：10，自引：0，他引：10  

岑况 《地质科技情报》1992,11(3):85-90

本文概述了矿物在超临界溶液中的溶解度理论计算。讨论了平衡常数法和自由能法的热力学原理和计算机方法。两种方法都需要热力学数据,所不同的是平衡常数法需要的是反应平衡常数,而自由能法需要物种自由能数据。方法确定以后这些数据具备与否及其精度是这项研究的关键。此外当溶液中离子强度较大时,寻求一种适当的活度系数算法对溶解度理论计算也至关重要。  相似文献   

宝山—香花岭一带岩浆岩的稀土元素特征     

王世明  匡耀求 《湖南地质》1992,(2)

在湘南著名的Cu、Pb、Zn、Sn多金属成矿区——宝山至香花岭一带,燕山期岩浆岩发育,成群成带展布。由北往南分别有宝山岩带、黄沙坪岩群和香花岭岩群,岩性由中性向酸性过渡。稀土元素分布特征表明:北边的宝山岩带可能是下部地壳物质批式熔融上侵产物,在上侵过程中可能经历过不同程度的分离结晶作用;南边的香花岭岩群可能是上部地壳物质重熔岩浆经分离结晶分异的产物;而中间的黄沙坪岩群则可能是重熔岩浆与下部地壳部分熔融初始岩浆混合后上侵再经结晶分异的产物,该区由北往南出现Cu—Pb、Zn—Sn的成矿分带是不同岩浆成矿专属性的体现。  相似文献   

夏季不同时段暴雨数值试验的对比分析          下载免费PDF全文

匡本贺 《大气科学》1988,12(3):333-336

本文通过对夏季不同时段暴雨个例的数值模拟试验,发现江淮流域初夏暴雨产生的条件主要应考虑大尺度降水作用.而在梅雨期的六月中旬后,除了大尺度降水作用外,还应充分考虑副热带高压外围的积云对流降水作用.计算结果表明:对梅雨期间的江淮暴雨,在细网格模式中加入郭晓岚的积云对流参数化方案(1965),暴雨预报结果有明显改进.  相似文献   

Critical conditions for tight oil charging and delineation of effective oil source rocks in Lucaogou Formation,Jimusar Sag,Junggar Basin,northwest China     

L. Zhou  L. Wu  L. Kuang  F. Jiang  H. Pang 《Australian Journal of Earth Sciences》2016,63(2):205-216

Although tight oil has great resource potential, studies of oil charging mechanisms in tight reservoirs are relatively few. Researchers have found that a force balance exists during oil charging, but quantitative analyses of conditions critical for tight oil charging are sparse. This study developed a formula to identify effective source rocks using oil expulsion intensity as the discrimination parameter based on quantitative expression of hydrocarbon-generation overpressure and force-balance conditions. Using this formula, critical oil expulsion intensity under conditions at various burial depths can be obtained. This method was applied in the tight reservoirs of the Jimusar Sag, Junggar Basin, China. The calculated critical oil expulsion intensity range was between 122.61 × 10⁴ t/km² and 620.01 × 10⁴ t/km². The distribution range of effective oil source rocks and total expelled oil can be determined on the basis of critical oil expulsion intensity at different burial depths. This method provides a new approach to predict favourable tight oil-bearing regions.  相似文献   

人工神经网络的短期气候定性预测方法研究   总被引：5，自引：3，他引：5  

覃志年金龙  况雪源 《气象科技》2004,32(3):168-172

采用EOF方法将众多具有一定物理意义的环境场预报因子和序列周期因子进行降维去噪处理，并结合人工神经网络前馈网络模型，进行了影响广西热带气旋年频数和夏季(6～8月)降水量短期气候预测的定性预报建模方法研究。结果表明，该方法对于影响广西热带气旋的年频数及广西夏季降水量定性趋势具有很好的预报能力，可作为一种新的短期气候预测业务预报配套方法。  相似文献   

Chemical Composition of Urban Street Sediments and Its Sources     

Doris Stüben 《中国地质大学学报(英文版)》2004,15(1):75-83

INTRODUCTIONBeijingfacesseveredustpollutionduetosuchsourcesasdustimportedfromwesterndeserts,industryandpowerplants,domesticcombustionprocessesandtraffic .Inthelastdecades ,theurbanpopulationhasgrowntomorethan10million .TheeconomicgrowthofChinahasalsoleftitsfootprintsinBeijing .Newindustrialzonesanddomesticar easweredeveloped ,inducinganincreasingtrafficcirculation(Shi,2 0 0 1) .Thedroughtclimateinalmostthewholeyear ,thestrongmonsoonsinwinterbringingdustsfromtheGobidesert,theheavytraffic…  相似文献   

Mapping impervious surface distribution in China using multi-source remotely sensed data     

Guiying Li  Longwei Li  Wei Guo  Wenhui Kuang 《地理信息系统科学与遥感》2020,57(4):543-552

ABSTRACT

Impervious surface area (ISA) data are required for such studies as urban environmental modeling, hydrological modeling, and socioeconomic analysis, but updating these datasets in a large area remains a challenge due to the complex urban landscapes consisting of different materials and colors with various spatial patterns. This research explores the integration of multi-source remotely sensed data for mapping China’s ISA distribution at 30-m spatial resolution. The integration of Visible Infrared Imaging Radiometer Suite Day/Night Band (VIIRS DNB) and Moderate Resolution Imaging Spectroradiometer (MODIS) normalized difference vegetation index (NDVI) data were used to extract initial ISA with spatial resolution of 250 m using a thresholding approach. The Landsat-derived NDVI and Modified Normalized Difference Water Index (MNDWI) were used to remove vegetation and water areas from the mixed pixels that existed in the initial ISA data. The spectral signatures of these ISA data were further extracted from Landsat multispectral images and used to refine the ISA data using expert knowledge. The results indicate that the integration of multi-source data can successfully map ISA distribution with 30-m spatial resolution in China with producer’s and user’s accuracies of 83.1 and 91.9%, respectively. These ISA data are valuable for better management of urban landscapes and for use as an input in other studies such as socioeconomic and environmental modeling.  相似文献   

综合利用测井曲线研究英台地区沉积微相──以青三段二砂组为例     

郭少斌  匡立春  杜旭东 《沉积与特提斯地质》1994,(4)

本文利用综合测井曲线，在前人沉积大相及亚相研究的基础上，对英台地区下白垩统青山口组三段二砂组（ｋ１ｑｎ３２）进行了沉积微相研究，目的在于进一步提高测井曲线信息的利用率，了解单砂层展布、规模和相带分区，为合理开发油气田提供依据。  相似文献