华南碳酸盐岩型铀矿床中有机质及其与铀成矿的关系

华南碳酸盐岩铀矿床,分布广泛,产于泥盒—二叠纪的各地层中。矿床受岩相、构造、水文地球化学等多种条件控制。矿化与有机质关系密切,而有机质的分布受泻湖相带控制。经研究对比,与成矿有关的有机质属于腐泥型,来源于海相微体生物和藻类。铀在各地层中的含量不均匀,富里酸和腐殖酸是含铀的主要有机质。     

湘东南硅酸-锶矿水化学特征及形成条件

湘东南地区已发现硅酸-锶矿水46处,化学类型多为HCO_3-Ca或HCO_3-CaMg型;温热矿水为HCO_3·SO_4-Ca或SO_4-Ca型。矿化度多小于1g/L,pH值6.5-7.5;温热矿水的pH值介于6.6—8.1之间。含有Li、Zn、I等对人身有益的微量元素.火成岩地区是寻找硅酸矿水的有利地区,碳酸盐岩的断裂带附近形成锶矿水有利,针对红层盆地的构造裂隙发育地段及碳酸盐岩区的温热水去寻找硅酸-锶矿水会取得良好效果。     

万山地区风化环境中汞的活动行为探讨

对层控矿床中成矿元素的表生分散、迁移、富集规律的研究,具有重要的理论和实际意义。本文以万山地区汞矿为例,探讨了汞及其共生元素铅、锌、锑的表生活动机制,以期有助于对汞的表生地球化学行为的深入讨论。     

Crustal Growth Rate of the North China Platform：a Method of Estimating Mass Equilibrium between Crust and Mantle

The following equation is proposed in this paper to estimate the crustal growth rate of the North China Platform on the basis of mass equilibrium between the crust and the mantle:

塔里木板块周缘晚古生代以来的构造演化

塔里木板块在晚古生代以来,经历了一系列碰撞和拼合事件,受北侧哈萨克斯坦－准噶尔板块碰撞的影响,南天山石炭纪再生洋盆于早二叠世末隆起,并导致天山山前陆盆地形成。这一时期塔木西部强烈的热活动事件,反映了一次地壳开裂活动,并导致天山山前的前陆盆地形成,这一时期里木西部强烈的热活动事件,反映了一次地壳开裂活动,同时进一步推动了塔里木向天山下插的陆内俯冲活动及前陆盆地的形成,中生代时期,特提斯洋盆的活动及先     

桂西北晚古生代地层中的沉积灰岩墙研究进展

桂西北晚古生代地层中近直立的二叠纪、三叠纪沉积灰岩墙与围岩时代相差最大超过80Ma(中二叠统茅口组灰岩墙插入中泥盆统东岗岭组中)，有人推测岩墙至少切穿整个石炭系、是海底扩张造成的巨型张裂隙；有人认为它是古构造间断面上古褶皱轴面裂隙充填。但这两种认识都有无法解释的矛盾。笔者识别出沉积灰岩墙内的变形平行层理和垂直贯入层理为地震灾变事件记录，认为沉积灰岩墙是地震液化沉积物流贯入地裂缝形成，是强地震事件在软硬岩层中的不同响应。同时发现与同沉积断裂伴生的台地边缘角砾岩是震裂岩、并有同期斜坡相塌积砾屑灰岩和盆地浊积岩(夹多层玄武岩)，从而揭示右江盆地内二叠纪—早三叠世火山—构造—地震—沉积系统、并初步解释了沉积灰岩墙成因。沉积灰岩墙表明右江盆地晚古生代有多个地震活跃期，灰岩墙与围岩的时间差标志多期局域构造活动。从而质疑早石炭世一中二叠世“右江盆地为稳定碳酸盐岩台地阶段”，进一步的深入研究将可能引起地层和构造关系的重新调整，进而对右江盆地演化和全球超大陆裂解提出重要证据。     

Tectonic Evolution of China and Its Control over Oil Basins

This paper is a brief review of the tectonic frame and crustal evolution of China and their control over the oil basins. China is subdivided into three regions by the Hercynian Ertix-Almantai(EACZ) and Hegenshan (HGCZ) convergent zones in the north, and the Indusinian Muztagh-Maqen(MMCZ) and the Fengxiang-Shucheng (FSCZ) convergent zones in the south. The northern region represents the southern marginal tract of the Siberian platform. The middle region comprises the SinoKorea (SKP), Tarim (TAP) platforms and surrounding Paleozoic orogenic belts. The southern region includes the Yangtze platform (YZP), the Cathaysia (CTA) paleocontinent and the Caledonides between them in the eastern part, and the Qinghai-Tibet plateau composed of themassifs and Meso-and Cenozoic orogenic belts in the western part. The tectonic evolutions of China are described in three stages: Jinningian and pre-Jinningian, Caledonian to Indusinian, and post-Indosinian. Profound changes occurred at the end of Jinningian (ca. 830 Ma) and the Indusinian (ca. 210 Ma) tectonic epochs, which had exerted important influence on the formation of different types of basins. The oil basins distribute in four belts in China, the large superimposed basins ranging from Paleozoic to Cenozoic(Tarim and Junggar) in the western belt, the large superimposed basins ranging from Paleozoic to Mesozoic (Ordos and Sichuan) in the central belt, the extensional rift basins including the Cretaceous rift basins (Songliao) and the Cenozoic basin (Bohaiwan) in the eastern belt, and the Cenozoic marginal basins in the easternmost belt in offshore region. The tectonic control over the oil basins consists mainly in three aspects: the nature of the basin basement, the coupling processes of basin and orogen due to the plates interaction, and the mantle dynamics, notably the mantle upwelling resulting in crustal and lithuspheric thinning beneath the oil basins.     

塔河碳酸盐岩洞缝型油藏堵水效果评价方法初探

总结了塔河油田碳酸盐岩洞缝型油藏的堵水工作．对堵水效果及其影响因素进行了探讨．认为堵水井储集体剖面类型、水淹特征及其类型、完井方式、投产方式对堵水效果有不同程度的影响：①大型洞穴型储集体堵水效果较其余储集体类型差．单一储集体剖面类型堵水效果较多重储集体剖面类型差：②底部出水型堵水效果明显好于其它出水类型．全井出水型堵水效果最差：⑨裸眼(直接)投产井堵水效果好于酸压(完井)投产井．最后就塔河油田超深碳酸盐岩洞缝型油藏的特点对行标SY／T5874—93的某些内容在操作上进行了讨论：建议统一机械堵水、化学堵水和复合堵水的有效期级别评价指标．并考虑降水幅度;措施有效率评价时应包含经济效益评价指标．针对油藏特点适当上提降水指标下限值;堵水增油量或有效期的计算应考虑堵前指标的动态变化趋势来综合确定。