含铀砂岩中铀与有机质、油气和煤的关系——以鄂尔多斯盆地东胜地区和吐哈盆地十红滩地区为例

目的探讨油、气、煤与铀的综合研究对于含油气盆地内多种能源的成因机制及盆地资源的开发利用。方法对鄂尔多斯盆地东胜地区和吐哈盆地十红滩地区砂岩型铀矿的岩石学特征、地质构造、含矿建造与古水文地质条件及铀矿的成矿特点等进行了综合分析与研究。结果源区火成岩和泥岩可能为铀的物质来源之一,铀矿化是成岩—后生阶段介质条件及环境改变的产物,受氧化-还原界面的控制;构造作用使目的层的抬升掀斜与暴露以及水动力环境是形成层间氧化带和铀矿化的重要条件;铀矿石带中黄铁矿表面及其附近存在吸附铀α径迹,有机质碎屑胞腔中沥青铀矿和黄铁矿共生,含铀砂岩中可见含沥青质的镜煤。结论铀的富集和铀矿的形成可能与黄铁矿、油气、煤等有机质有密切的成因关系。     

Taxonomy, age and environment status of the Yuanmou hominoids

When, where and from which hominoid the human originated has been one of the key subjects in the study of human natural history. It is therefore very important to learn the chronological, geographical and taxonomic distribution of all hominoids. Yunnan Pr…     

Effect of Land Use on Soil Properties in Debris Flow Bottomland： A Case Study at Xiaojiang Basin, Yunnan

In order to understand the effect of different land use on soil physics and nutrients properties of the debris flow bottomland, a case study at Daqing gully （in Xiaojiang Basin, Yunnan） was conducted in 2004. Soil samples were taken at depth of 0-10,10-20,20-40,40-60,60-80 cm under three land use patterns crop bottomland （CL）, forest bottomland （FL）, and barren bottomland（BL）. The results showed that the developing bottomland to CL promoted soil toaccumulate total phosphorus （TP） and available phosphorus （AP）, pH value transferred from neutral to alkalescency, and organic matter decreased significantly. Furthermore, the contents of total nitrogen （TN） and available nitrogen （AN） in CL were lower than that of FL and BL because the growth of crops consumed more nutrients in soil. The results also showed that the contents of TP, AP and available potassium （AK） in soil were positively correlated with soil particle.     

柴西南区古近系层序地层特征及岩性圈闭发育模式

应用层序地层学理论,利用地震、钻井和测井资料,对柴西南地区古近系层序地层框架进行系统分析.古近系处在以中新统内不整合面(T2′)和古新统合新生界之间的不整合面(TR)为顶底界的二级层序中,共发育有3个三级层序:即路乐河层序(SA)、下干柴沟层序(SB)和上干柴沟层序(SC).重点分析了下干柴沟层序及上干柴沟层序,认为下干柴沟层序由3个体系域组成:即低位体系域、湖侵体系域及高位体系域.上干柴沟层序由于低位体系域不发育,故将其划分为湖侵体系域和湖退体系域两个体系域.另外,分析了柴西南地区不同的体系域中岩性圈闭可能发育位置,并且建立了隐蔽圈闭的分布模式.     

黄河流域水生态的现状及防治对策

结合黄河流域水生态的现状,分析了影响当今水生态环境问题的自然和人为因素,提出了保护黄河流域水生态环境的对策。     

鄂尔多斯盆地北部下石盒子组-山西组储层岩石学和成岩作用

鄂尔多斯盆地北部下石盒子组 -山西组是天然气的重点勘探层位 ,根据薄片研究、阴极发光显微镜研究、粘土矿物分析、同位素分析 ,对鄂尔多斯盆地北部下石盒子组 -山西组的岩石学特征和成岩作用进行了分析 ,认为研究层位的岩石类型主要为岩屑砂岩 ,少量的长石岩屑砂岩。储层砂岩的成岩作用主要有长石的高岭石化、压实作用、自生矿物的形成作用、胶结作用及交代作用。最后根据成岩作用的特征 ,建立了研究区储层砂岩的成岩演化序列     

鄂尔多斯盆地早侏罗世富县期冲积扇沉积

在综合研究野外露头、钻井剖面及室内编图、地层对比的基础上 ,指出鄂尔多斯盆地冲积扇 -河流沉积体系是侏罗纪富县期主要的古地理格局 ,富县期沉积受与古地貌密切相关的五条河谷控制。认为鄂尔多斯盆地侏罗纪富县期冲积扇沉积具进积型特征 ,其形成与古地形密切相关 ,分布于古甘陕、庆西河谷内     

羌塘盆地构造单元划分及含油气远景评价

对14条近4000km的大地电磁测探资料进行了一维及二维连续介质反演，根据反演结果及地面地质资料解释确定了侏罗系、上三叠统底界面海拨高度图以及前泥盆系顶界面海拔高度图，并根据以上研究结果以及地质资料对羌塘盆地进行了构造单元划分以及含油气远景评价。     

Preliminary study on land surface characteristics over Huaihe River Basin

The analysis of the flux observation dada from the Huaihe River Basin Experiment (HUBEX) shows that, in semi-humid monsoon regions, latent heat flux is as important as sensible heat flux in most situations. Moreover, it can even dominate the sensible heat flux in cropland and paddy field. This is distinct from that for arid and semi-arid regions where the sensible heat flux is dominant. Under clear sky conditions, the soil temperatures in different vertical layers all exhibit certain diurnal variations, and the magnitude decreases with depth to less than 1°C at a depth of 60 cm. This depth is considered as the transition layer for the soil moisture variation. On the other hand, the vertical profile of soil water content varies with the soil texture and even weather conditions, and the layer with maximum soil water content can also be found in Jiangji station during June 1998.     

Reservoir characteristics and genesis of high-porosity and high-permeability reservoirs in Tarim Basin

Based on detailed studies, this paper proposesthat in the Tarim Basin, hydrocarbon reservoirs widespreadeither in vertical sequences or in plane and high-porosity andhigh-permeability reservoirs are developed all over the basin.However, obvious difference and heterogeneity exist amongdifferent kinds of reservoirs. The lithologic characteristics,reservoir space types and reservoir properties in variousstrata have been probed. The result indicates that althoughthe Paleozoic carbonates have been deeply buried for a longperiod, high-quality reservoirs with the porosity of up to 5%—8% (12% as the maximum) and the permeability of10×10^-3—100×10^-3 μm² (1000×10^-3 μm² as the maximum)can be found in certain areas. These include the area withthe development of reefs and carbonate beaches, the weath-ered-crust buried-hill belts that have undergone thelong-term exposure, weathering and leaching, the area withthe development of dolomitization, and those areas that haveexperienced the resolution of carbonic acid and organic acidgenerated by the maturity of the organic matter. Finally, thegenesis of the high-porosity and high-permeability reservoirsin deep-buried conditions (with the depth more than 3500 m)have been investigated thoroughly.