珠江口盆地西江主洼油气差异分布机制

西江主洼是珠江口盆地一个低勘探程度洼陷，油气差异聚集特征明显，但其机理不清。本文在断陷盆地油气成藏理论指导下，利用研究区地质、地球物理和地球化学等资料，开展了烃源岩、断盖组合、储集体系和运聚模式等方面的研究。结果表明，裂陷期沉降、沉积中心有序迁移，造成主力烃源岩自东向西由文四段迁移至文三段、文一+二段，控制东、西部油气差异分布。恩平组区域性泥岩发育且晚期断裂缺乏，导致油气纵向上更易聚集于下构造层；区域泥岩减薄尖灭或晚期断裂切开盖层的区域，上构造层有一定油气分布。"源-汇"类型从宏观上控制储层优劣，影响下构造层油气富集程度；"仓储"运移是控制上构造层油气规模聚集的主要模式。下构造层古近系应作为重点部署方向，东部围绕文四段、西部围绕文三段、文一+二段烃源岩构成的含油气系统展开；上构造层勘探需关注珠海组，在隆起周边寻找具备"仓储"运移模式的有利区带。     

基于VSD模型的区域生态系统脆弱性评价——以广西西江经济带为例(英文)

生态系统脆弱性受到自然与人文因素双重影响。以广西西江经济带为例,采用VSD模型,通过暴露度、敏感性和适应能力分解脆弱性,构建包含自然和人为因素的25指标的评价体系,开展脆弱性评价与分区。结果表明,不脆弱区、一般区、脆弱区、很脆弱区和极脆弱区分别占11.31%、22.63%、27.60%、24.39%和14.07%,东西部地区脆弱性较高,中部地区脆弱性较低;自然因素导致的脆弱区主要分布于东西部山区,人为因素主导的脆弱区分布于中部盆地的城镇及其周边;经济带约53%的建设用地分布于很脆弱区和脆弱区,未来新增建设用地需要重点向不脆弱区和一般区转移。根据分区结果和诱因差异,提出了不同类型区开发与保护的相关建议。     

广东肇庆西江珍稀鱼类省级自然保护区鱼类多样性

2006-2008年对西江珍稀鱼类自然保护区江段进行鱼类组成与生境调查,共采集鱼类81种,隶属于11且25科69属.其中洄游鱼类8种,外来种6种,土著淡水鱼类67种.以种类数及其多样性指数分析,表明西江保护区鱼类种类多样性较高.优势种是鲮鱼、赤眼鳟、广东鲂,主要经济鱼类为广东鲂、赤眼鳟、鲮鱼、黄尾鲴、花鰶,珍稀濒危物种有花鳗鲡.珠江长臀鮠、台细鳊及多种珠江水系特有鱼类.保护区鱼类生态类型多样,以定居性、杂食性和底栖鱼类为主.保护区江段水文动力条件独特,河床底质结构复杂,是西江鱼类栖息、产卵的理想场所,栖息地破坏、过度捕捞等是保护区鱼类生物多样性的主要胁迫因素.     

新疆伊热达坂铅锌矿矿床地质特征及找矿标志

伊热达坂铅锌矿区位于塔里木微板块的塔里木北缘古生代被动陆缘带,阿尔彼什麦晚古生代前陆盆地,矿体主要赋存于上泥盆统哈孜尔布拉克组下段（D3h1）。本文主要对伊热达坂铅锌矿床地质特征进行分析和总结,初步揭示矿床的找矿标志。     

旅游景区商业化层级结构研究:要素识别与矢量测度

旅游景区商业化现象已经成为影响游客满意度及景区健康发展的重要前置变量,进一步厘清民族村寨、历史文化城镇景区商业化现象的系统结构、功能与影响机理,有助于对景区商业化现象进行合理的引导及控制。以贵州雷山西江苗寨为例,通过德尔菲调查法对旅游商业化结构系统的驱动要素进行识别,运用集成DEMATEL的解释结构模型方法对旅游商业化影响要素间的层级结构、有向作用强度及身份信息进行分析。研究结果显示:旅游景区商业化系统分为7个层级,涉及商业、社会、环境、管理及旅游产品5个类别的18个构成要素,各要素间表现为非平衡的作用关系。最后提出民族村寨、历史文化城镇景区旅游商业化控制的建议。     

珠江口盆地西江主洼泥-流体底辟及其发育条件

珠江口盆地西江主洼存在垂向的反射成像浑浊区域,这种垂向模糊区的地质成因多与盆地底辟活动相关。对西江主洼33西洼古近系地震资料中垂向模糊区的地震剖面特征形态及其地震波阻抗特征进行研究,并结合研究区盆地古近纪发育演化的特点认为,该模糊区拥有深、浅部反射不同的二元结构,可能是一处泥-流体底辟构造。西江主洼的古近系文昌组深湖相分布广泛,可以作为泥-流体底辟的泥源物质存在;33西洼钻井恩平组底部恩四段地层存在高压异常,恩平组顶部地层广泛发育的泥岩,可作为封存箱盖层,西江主洼具备形成封存箱的超压条件。而珠海期的岩浆侵入破坏了封存条件,诱发了盆地的泥-流体底辟活动,在33西洼古近系地层形成了深埋型-弱刺穿的锥状泥-流体底辟。     

西江流域开发的战略地位及其管理创新

西江流域开发在大西南开发乃至整个西部大开发中具有十分重要的战略地位；大西南区域经济开发的增长轴；西南对外开放的主通道；南中国西电东输的开发基地；我国生态环境建设的战略重点，但是条块分割的管理矛盾导致流域开发整体效益的下降，不利于西江流域经济社会可持续发展，迫切需要进行组织管理制度创新。针对西江流域的特点，作者提出了建立具有最高决策权的西江流域开发协高委员会，实行统一管理，垂直领导的管理体制。     

Stable isotopic composition of riverine dissolved inorganic carbon of the Xijiang River Inner Estuary

For researching the spatio-temporal variation of the stable isotopic composition of the riverine dissolved inorganic carbon (DIC), we had carried out a survey throughout the hydrologic year during which the δ13CDIC of the surface water and its physicochemical pa-rameter were examined along the Xijiang River Inner Estuarine waterway from September 2006 to June 2007. There was a striking seasonal variation on the average δ13CDIC, as the average δ13CDIC in summer (?13.91‰) or autumn (?13.09‰) was much less than those in spring (?11.71‰) or winter (?12.26‰). The riverine δ13CDIC was controlled by decomposed condition of the riverine organic matter linking the seasonal variation of the physicochemical parameter in the surface water according to the correlation analysis which indicated notable relations between δ13CDIC and water temperature (p = 0.000; r = ?0.569) or between δ13CDIC and oxide-reduction potential (p = 0.000; r = 0.646). The striking positive correlation between δ13CDIC and the sampling distance happened in the summer rainy season, while striking negative correlation happened in the spring dry season, indicating that river-sea interaction influenced water physicochemical parameters and controlled the riverine DIC property in the survey waterway. In view of the riverine δ13CDIC decreasing for the decomposition of the ter-restrial organic matter in the rainy season in summer and increasing for the briny invaded zone extending in the spring dry season along the waterway from the Makou gauging station to the Modaomen outlet, the δ13CDIC spatio-temporal variation was closely related to the geographical environment of the Xijiang drainage basin.     

Chemical weathering and CO2 consumption in the Xijiang River basin, South China

Monthly samples of riverine water were collected and analyzed for the concentrations of major ions (Ca²⁺, Mg²⁺, K⁺, Na⁺, HCO₃⁻, SO₄²⁻, Cl⁻, NO₃⁻), dissolved silicon, and total dissolved solids (TDS) at Wuzhou hydrological station located between the middle and lower reaches of the Xijiang River (XJR) from March 2005 to April 2006. More frequent sampling and analysis were carried out during the catastrophic flooding in June 2005. Stoichiometric analysis was applied for tracing sources of major ions and estimating CO₂ consumption from the chemical weathering of rocks. The results demonstrate that the chemical weathering of carbonate and silicate rocks within the drainage basin is the main source of the dissolved chemical substances in the XJR. Some 81.20% of the riverine cations originated from the chemical weathering processes induced by carbonic acid, 11.32% by sulfuric acid, and the other 7.48% from the dissolution of gypsum and precipitates of sea salts within the drainage basin. The CO₂ flux consumed by the rock chemical weathering within the XJR basin is 2.37 × 10¹¹ mol y^− 1, of which 0.64 × 10¹¹ mol y^− 1 results from silicate rock chemical weathering, and 1.73 × 10¹¹ mol y^− 1 results from carbonate rock chemical weathering. The CO₂ consumption comprises 0.38 × 10¹¹ mol during the 9-d catastrophic flooding. The CO₂ consumption from rock chemical weathering in humid subtropical zones regulates atmospheric CO₂ level and constitutes a significant part of the global carbon budget. The carbon sink potential of rock chemical weathering processes in the humid subtropical zones deserves extra attention.     

少数民族村寨社区居民对旅游增权感知的空间分异研究——以贵州西江千户苗寨为例

在文献综述的基础上,以贵州西江千户苗寨为样本地,借鉴雅克松关于旅游者空间划分的标准,将样本地划分为核心区、过渡区和外围区,分别发放居民对旅游增权感知的调查问卷,以此进行民族村寨旅游地社区增权的空间分异研究,并对其空间分异的形成原因进行探讨分析.研究表明:社区增权在旅游目的地的空间不平衡是社区参与旅游机会差异的表征,不同...