一种新的储层孔隙成因类型--石英溶解型次生孔隙   总被引：26，自引：2，他引：26  

邱隆伟  姜在兴  陈文学  李晓红  熊志东 《沉积学报》2002,20(4):621-627

石英作为碎屑岩储层中的一种难溶组分,普遍认为它和次生孔隙的形成关系不十分密切。研究认为泌阳凹陷核桃园组储层中的碎屑石英颗粒存在明显的溶解现象,并形成以石英直接溶解型孔隙为主的储集空间特征。石英颗粒被溶解的部分在薄片中所占的范围为 2 %～ 7%者常见,高者达 8%以上,在总孔隙中所占的相对含量也多数在10 %～ 35 %之间,早成岩B期是其最主要形成期。石英溶解型次生孔隙的大量存在为碎屑岩储层中SiO₂ 胶结物及次生孔隙成因等问题的解释以及储层预测和评价提供了新的可能性。  相似文献   

East Asian monsoon instability at the stage 5a/4 transition   总被引：2，自引：0，他引：2  

SHANGFA XIONG  ZHONGLI DING  TUNGSHENG LIU  JINGZHAO ZHANG 《Boreas: An International Journal of Quaternary Research》2002,31(2):126-132

The physics involved in the abrupt climate changes of the late Quaternary have eluded paleoclimatologists for many years. More paleoclimatic records characteristic of different elements of the global climate system are needed for better understanding of the cause-feedback relationships in the system. The East Asian monsoon is an important part of the global climate system and the mechanical links between the East Asian monsoon and other climatic elements around the world may hold a key to our knowledge of abrupt climate changes in East Asia and probably over a larger part of the globe. Previous studies have detected millennial-scale winter monsoon oscillations during the last glaciation and probably also during the last interglaciation in loess sequences across China. However, less attention has been paid to the abrupt summer monsoon changes and the stage 5a/ 4 transition, an important period for the evolution of the East Asian monsoon when the global climate shifted towards the last glaciation. Here we report on two loess sections from eastern China which were dated using a thermoluminescence (TL) technique. The pedogenic and other sediment parameters suggest that the summer monsoon experienced a two-step abrupt retreat at the stage 5a/4 transition. The variations in the proxies for the winter monsoon are synchronized with the summer monsoon proxies during this brief interval, implying a direct and immediate link between high latitude and low latitude mechanisms. These changes may be correlated with similar climatic oscillations observed in the North Atlantic, Europe and Antarctica, raising the possibility that the forcing factors that induced these changes are global in extent.  相似文献   

Analysis and comparison of the tidal gravity observations obtained with LCR-ET20 spring gravimeter     

孙和平  陈晓东  刘明  周百力 《地震学报(英文版)》2002,15(5):533-539

Introduction The tidal variation signals of the solid Earth recorded with the modern measuring techniques can be used to provide effectively the means to cognize the Earths motion, deformation and structure character, especially to monitor the material motion in the Earths interior. In the recent 20 years, the distribution character of the global gravity field has made great progress since the continuous and deep theoretical studies in geophysics and geodesy domains. The successful manufactur…  相似文献   

两个冰期-间冰期旋回的黄土记录及其古气候意义   总被引：9，自引：14，他引：9  

熊尚发  刘东生  丁仲礼 《地理科学》2002,22(1):18-23

北京邻区枣沟、斋堂和赤峰黄土－古土壤剖面粒度和磁化率变化在幅度和相位上都有明显的差异。在两个冰期－间冰期旋回，磁化率记录具有冰量变化模式，而粒度记录具有轨道周期特点，粒度和磁化率之间的相位关系在从冰期向间冰期转换和冰期向间冰期过渡的过程中，既有滞后也有超前的表现，很难单纯以成土作用来解释。由于黄土粒度主要反映粉尘源区环境和古风场强度的变化，而磁化率主要记录的是沉积区的成壤作用，反映夏季风的强度变化，因此剖面粒度和磁化率变化的不协调说明古风场和粉尘源区变化与粉尘沉积区气候变化之间不统一。这可能意味着控制夏季风强度变化和控制冬季风强度变化的机制存在差异。  相似文献   

中国西部山地发展的一般模式——以天山巴音布鲁克地区为例   总被引：7，自引：1，他引：7  

张百平  陈晓东  叶尔·道来提  巴特尔  李建新  李宝林  阿里西尔·库尔班  姚永慧 《山地学报》2002,20(4):394-400

中国西部山区是我国的水源地及生态屏障，它们的合理开发与保护是西部大开发的基本内容。研究归纳出山地发展的“巴音布鲁克模式”：（1）天鹅及其生境的绝对保护（核心）；（2）建立可持续牧业（主体）；（3）规范和发展旅游业（突破口）；（4）西蒙古土尔扈特传统文化的保护（文化多样性）。中国西部山区的发展模式都可以概括为一个核心（自然保护）三个圈层（与当地主要土地资源相适应的主导产业，与当地特有资源相联系的新兴产业，当地民族文化保护）。这种模式能够充分体现生态优先的思想，同时考虑到促进地区新老经济及文化的发展与保护，符合西部大开发的方针。  相似文献   

An X-Ray Diffraction Study of an Inclusion in Diamond from the Luobusha Chromite Deposit in Tibet, China     

SHI Nicheng  BAI Wenji  MA Zhesheng  FANG Qingsong  XIONG Ming  YAN Binggang  DAI Mingquan  YANG JingsuiChina University of Geosciences  Beijing  E-mail: shinicheng@a-l.net.cn Institute of Geology  Chinese Academy of Geological Sciences  Beijing Liu Shuchun  Zhu Xiling 《《地质学报》英文版》2003,77(3):326-331

Diamond was found in podiform chromitites of ophiolite and harzburgite from Luobusha, Tibet. There are silicate inclusions in some diamond grains from this area. In the present work, the CCD (charge coupled detector) technology of X-ray powder diffraction was applied to the study of the inclusion in diamond from the ophiolite of Tibet. Diffraction patterns are obtained even though the inclusion is only 20 μm in crystal size. The results show that the inclusion in diamond consists of talc and clinochrysotile. Therefore, it is clear that the diamond from the ophiolite of Luobusha, Tibet, is natural diamond rather than a synthetic one.  相似文献   

高寒富水地区-西藏那曲镇给水管道的安装及维修     

曾小东 《地质灾害与环境保护》2003,14(2):76-78

西藏那曲镇是全世界海拔最高、含氧量最稀薄、最后一个安装自来水的地级城市。那曲镇海拔高度为4500m，冻土层深达2．8m，地下水丰富，基础开挖超过lm时就有地下水渗出，且土质多为流沙型，施工时容易引起塌方，施工环境恶劣。本文就那曲镇的具体情况介绍一下给水管道的安装及维修。  相似文献   

西藏蛇绿岩中硅铁合金组合及成因探讨   总被引：5，自引：2，他引：5       下载免费PDF全文

白文吉杨经绥  陶淑凤施倪承方青松  马喆生颜秉刚熊明  代明泉 《岩石矿物学杂志》2003,22(3):279-284

在雅鲁藏布江蛇绿岩带的东端罗布莎蛇绿岩的铬铁矿中发现不寻常的硅铁合金组合。4种硅铁合金的理论分子式分别为Fe0.84Si2.00(Fe3Si7)、Fe7Si3、Fe6Si4以及Fe4Ti3Si2P。这些合金均选自铬铁矿石的人工重砂中，在少数颗粒中见到由3种硅铁合金组成的交生结构，明显表明这些合金的同生和同成因性。推测它们为化学反应成因,来自于核幔边界地带。  相似文献   

Discussion on the feature of strong earthquake: Orderly distribution in time, space and intensity before the Western Kunlun Mountain Pass M=8.1 earthquake     

张晓东  张永仙  吕梅梅  余素荣 《地震学报(英文版)》2003,16(6)

Introduction The Western Kunlun Mountain Pass M=8.1 earthquake occurred on November 14, 2001 is the other M=8 earthquake occurred 50 years after Dangxiong, Tibet M=8.0 earthquake in Chinese mainland. The earthquake has caused the attention of the seismologists in the following aspects: 1) The fracture length is more than 400 km, which is far away from the estimated length by the statistic empirical function between the magnitude and the fracture length (WANG, et al, 2002); 2) The aftersh…  相似文献   

构造应力场转换的成矿地球化学响应   总被引：10，自引：0，他引：10  

杨立强  熊章强  邓军  张中杰  王建平  李新俊 《大地构造与成矿学》2003,27(3):243-249

以剪切带型金矿为例,基于对中国东部胶东西北部地区及其典型金矿田、金矿床构造应力场与成矿地球化学场的详细研究结果,初步阐释了它们在多重时-空间尺度上的耦合关系。区域尺度上,应力极值区不利于成矿,金矿床就位于应力梯级带,尤其是不同方向应力梯级带的交汇部位。矿田尺度上,成矿物质有从应力高值区向低值区运移的趋势,成矿主期应力梯度的增大有利于成矿元素进一步浓集,应力梯级的强烈变化地段(或时段)往往形成金属元素的大量堆积。矿床尺度上,成矿物质的运移受不同方向剪应力梯级带的叠加影响,金属元素就位于NE和NW向应力梯级带交汇部位缓坡带一侧的次级梯级带之上。多重时-空尺度成矿动力学的深入研究,将可能揭示出这种非线性效应的丰富内涵。  相似文献