塔里木盆地流体与油气藏   总被引：6，自引：0，他引：6       下载免费PDF全文

顾家裕  范土芝等 《地质论评》2001,47(2):201-206

本文以塔里木盆地为例，通过流体势分析，油田水化学分析，包裹体测温和原油中含氮化合物的丰度及比值研究，确定塔中地区晚海西期油气主要来自东北和西北两个方向，在中段形成塔中4油藏，并通过流体运移方向分析，认为塔中4油藏在喜马拉雅期受淡水冲洗破坏，使油所储量大大减少，轮南地区的油气主要来自南部的满加尔凹陷和两侧的哈拉哈塘凹陷和草湖凹陷，其中草湖凹陷两次供油气，而其他两个凹陷三次供油气，流体运移方向的研究有助于认识油气的分布规律，对确定勘探的有利区带和目标具有重要意义。  相似文献   

地质事件、序列和事件群   总被引：10，自引：2，他引：10       下载免费PDF全文

陆松年  李怀坤等 《地质论评》2001,47(5):521-526

在前寒武纪变质基底和造山带中，由于多期热－构造事件的影响，以及透入性片理和构造岩的发育，造成变质深成侵入体，构造岩和表壳岩鉴别的困难，。即使表壳岩系统也因强烈的变形而不能够完全运用叠置地层学的方法进行地层划分和对比，因而事件地质学的思路和方法的应用颇为广泛。地质事件是地史演化过程中，不同于正常地质历史发展的突发性，或灾变性，或具有特殊意义的地质记录，在正确识别地质事件的性质和特征的基础上，需建立地质事件的序列，事件序列的建立包括两个步骤，首先要在野外翔实的工作基础上建立地质事件的相对序列，然后在此基础上运用多元同位素测年方法标定主要或特征地质事件的时代，建立地质事件的年代格架。地质事件群或组合则是成因上有联系，空间上相匹配，时间上有先后的一组地质事件，它比单独的一个事件更深刻地反映地质历史演化的过程和特点，正确归并和界定地质事件群在研究区域地质演化特征或进行大区域间的地质对比时具有十分重要意义。  相似文献   

润扬长江公路大桥三维地质分析     

方海东  施斌  吴振君 《上海国土资源》2001,(Z1):39-42

该文从三维地质建模的概念出发,探讨了其一般过程,包括地质变量预测、地质特征解译、空间分析等,并介绍了三维地质建模的体视化方法,最后以润扬长江公路大桥工程为例,运用切片级重建方法,建立地质模型,并进行了三维地质分析.实践表明,三维地质建模技术是认识复杂地质体的空间关系和特征的强有力的工具,具有广阔的应用前景.  相似文献   

Devonian Frasnian-Famennian Transitional Milankovitch Cycles and High-Resolution Stratigraphic Correlation     

GONG Yiming Faculty of Earth Science  China University of Geosciences  Wuhan  LI Baohua Laboratory of Marine Geology  Tongji University  Shanghai  WU Yi Guangxi Institute of Geology  Nanning 《《地质学报》英文版》2001,75(4):354-363

Four hierarchical cyclothems, superbundlesets, bundlesets, bundles and laminae, have been identified from the Devonian Frasnian-Famennian carbonate strata in Guangxi, South China. Their hierarchical structures, ratio relationships and sequence in conodont zones are continuous and stable and can be traced across different facies zones and sedimentary basins. Our data show that hierarchically organized superbundlesets, bundlesets, bundles and laminae correspond to the long eccentricity, eccentricity, obliquity or precession and sub-Milankovitch cycles respectively. Their periods were 400,000, 100,000, 33,333, 16,667 and 8,000-17,000 a, respectively. The ratios of long eccentricity to eccentricity, eccentricity to obliquity, and eccentricity to precession in the Devonian are 1:4, 1:3 and 1:6 respectively. Using these hierarchical Milankovitch cyclothems, chronostratigraphical division and correlation can be realized at a resolution of 100 ka or 10 ka at the Frasnian-Famennian transition. The time intervals  相似文献   

Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan and Guangxi, China   总被引：2，自引：0，他引：2  

WU Genyao Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing 《《地质学报》英文版》2001,75(4):391-397

Recent discoveries of ophiolites indicate that there must be a Palaeotethyan geosuture zone bordering China and Vietnam, which separates the Vietbac block from the South China subcontinent. The Indosinian foreland fold-and-thrust belt bordering Yunnan and Guangxi provided further evidence for the palaeotethysides. The oceanic crust was subducted southwestwards while the magmatic arc migrated northeastwards, and the continent-arc collision occurred in the Late Triassic with the thrusting being extended towards the north or northeast. The features of thrust-nappe structure are discussed, which proved the continental margin of the Palaeotethyan ocean there to be a complicated one. A face-to-face collision occurred first along the NW-striking segment and then along the ENE-striking segment accompanied by transpression or oblique thrusting occurring along the NW-striking one.  相似文献   

New Data of Daomanite and Hongshiite     

YU Zuxiang Institute of Geology  Chinese Academy of Geological Sciences  Beijing Fei Zhenbi 《《地质学报》英文版》2001,75(4):458-466

In 1974 the author preliminarily reported two new platinum group minerals-daomanite and hongshiite. The two minerals were accepted by the Commission on New Minerals and Minerals Names of the International Mineralogical Association in 1976 and 1982 respectively. Because of the conditions at that time, the work was preliminary, for example, there were only reflectance values of four wave bands. Recently the author again made measurements of reflectances, corrected cell parameters by the four-circle diffractometer and electron diffraction and supplemented their new occurrences and nomenclature.  相似文献   

Geochemical Characteristics of the Cenozoic Volcanic Rocks in Central Qiangtang, Tibet: Relation with the Uplift of the Qinghai Tibet Plateau     

TAN Fuwen  PAN Guitang  XU Qiang Chengdu Institute of Geology  Mineral Resources  Chengdu 《Continental Dynamics》2001,(1)

1. Introduction The uplift and evolution of the Qinghai Tibet Plateau has been the most important projects for studying the dynamic process of the plateau, and the uplift mechanism and history are the essential problems. Researches have been done extensively in terms of tectonics, sedimentology, geophysics, paleontology, paleoclimate and paleomagnetism for several tens of years. Many evolution models have been suggested but so far none of them have been explained perfectly. In recent years,…  相似文献   

A New Intergrowth Consisting of FeO and SiO_2 Phases from Lower Mantle   总被引：2，自引：0，他引：2  

BAI Wenji  Tao Shufeng  SHI Rendeng  YANG Jingsui  FANG Qingsong  YAN Binggang  ZHANG Zhongming Institute of Geology  CAGS  Beijing  China  Beijing General Research Institute of Mining & Metallurgy  China 《Continental Dynamics》2001,(2)

1. IntroductionIn order to confirm the presence or absence of diamonds in the Luobusa ophiolitic chromitite in Tibet, about 1500 kg chromitite sample was collected for separating its associated minerals, in which diamond, moissanite, octahedral pseudomorphic serpentine and chlorite, native silicon, native chromium, some alloys and other minerals were found. A wide variety of minerals, including about 70-80 types of mantle minerals from the Luobusa ophiolite, were identified by energy dispersi…  相似文献   

大别超高压榴辉岩高温高压下电导率实验研究   总被引：7，自引：0，他引：7  

朱茂旭  谢鸿森  赵志丹  郭捷  白武明 《地球物理学报》2001,44(1):93-102

为研究大陆中下地壳高导层成因及与物质组成之间的关系，用模拟实验的方法在不同的温度、压力条件下分别测定了干的和1mol/LNaCl溶液饱和的榴辉岩的电导率.结果表明，干榴辉岩平行线理方向的电导率比垂直于线理方向的高，但两个方向上的活化能相近.在中下地壳条件下，干榴辉岩的电导率比中下地壳高导层电导率值低几个数量级.常温下1mol/LNaCl溶液饱和的榴辉岩两个方向上的电导率对压力具有不同的依赖性；在中下地壳条件下，1mol/LNaCl溶液饱和的榴辉岩的电导率可达到一般高导层的电导率值.无论干的还是饱和的榴辉岩都不能解释大别山20-50km深处的高导层成因，因此，在该深度范围内榴辉岩不可能是主要的岩石组成.  相似文献   

二连盆地巴音都兰凹陷早白垩世构造岩相带特征及含油性   总被引：6，自引：4，他引：6       下载免费PDF全文

崔周旗  吴健平  李莉  王海潮 《古地理学报》2001,3(1):25-34

在系统观察岩心的基础上，从单井相分析入手，结合地震相和测井相模式，以及大量岩矿、粒度等分析化验资料，对巴音都兰凹陷下白垩统巴彦花群的物源方向、沉积体系、构造岩相带及含油性进行了研究。认为区内具有东、西两大物源区、五大水系控制着十一个砂体的平面展布，最终，划分了扇三角洲等五种沉积体系，总结出具平台型陡坡扇三角洲等六种构造岩相带，并着重对有别于典型单断箕状凹陷的三种构造岩相带的含油性进行了初步探讨。  相似文献