低渗透储层水平井—直井联合布井极限注采井距研究

低渗透储层水平井—直井联合布井技术具有广泛的应用前景,其布井方式至关重要。首先利用劈分流场的方法直观地给出常规储层水平井—直井联合布井的产能评价方法;然后针对低渗透储层的渗流特点,在考虑启动压力梯度条件下建立新的井网渗流物理模型并求解得到产能评价公式;最后经分析计算给出启动压力梯度影响的面积井网极限注采井距关系曲线。研究结果为低渗透储层部署水平井—直井联合井网提供理论依据。     

西湖茶园茶叶铅污染铅同位素示踪

通过对西湖茶园的植物和土壤样品进行一系列的调查,以着力寻找茶叶的铅污染源。利用铅同位素技术对西湖茶园的土壤、茶叶和城区的燃煤、大气气溶胶、汽车尾气进行铅同位素示踪研究。研究表明,茶园土壤铅物质的可溶相具同源性和残查态偏于多源性。清洗后的茶叶铅含量显著降低,但其同位素组成不发生明显改变,显示出茶叶中的铅与叶面空气沉降物中的铅同源。不同介质铅同位素对比值平均值呈现表土、大气(气溶胶)、煤的w(²⁰⁶Pb)/w(²⁰⁷Pb)与茶叶趋于相近,汽油低之;表土、大气(气溶胶)、汽油的w(²⁰⁸Pb)/〔w(²⁰⁶Pb)+w(²⁰⁷Pb)〕与茶叶趋于相近,煤略高之。不同区域茶叶铅物质具同源性,与种植的农业地质背景无关。在煤燃烧、气化过程中,Pb进入大气,通过大气沉降或被茶树吸收或附着在茶叶叶面;汽车尾气的排放是茶树铅污染的重要原因之一。     

一个新的沉积变质型钛矿床的成矿模式及找矿方法

内蒙古羊蹄子山沉积变质型钛矿床是一个新的钛矿床类型。通过对地质、地球物理前提条件的研究和找矿方法试验,认为高精度磁法是找沉积变质型钛矿床的基本方法,重力为有效的找矿方法。在矿区北带磨石山以金红石为主的富钛矿体上有600 μGal的重力异常,无磁异常;南带的羊蹄子山钛铁矿体上重力异常为500 μGal,有60 nT的弱磁异常。     

辽宁东五家子金矿矿脉含矿性评价标志研究

辽宁东五家子金矿的矿脉由蚀变岩和石英脉透镜体构成,可采矿体均为硫化物石英脉型.工业矿脉中,石英为烟灰色,发育他形、半自形的细粒黄铁矿等硫化物,有较大规模的矿体.矿化脉中,石英为乳白色,发育粗粒、自形的浅色黄铁矿,无可采矿体.在工业矿脉、次要矿脉、矿化脉的蚀变岩和石英脉样品中,Au,Hg与其他元素的相关性有明显区别.用石英脉样品的As-Ni-Ba图解和蚀变岩样品的Au-Ag-Ba图解预测,矿区外围的西沟1号脉和西沟3号脉属于工业矿脉.     

Benthic nutrient fluxes in the intertidal flat within the Changjiang （Yangtze River） Estuary

In an annual cycle from March 2005 to February 2006, benthic nutrient fluxes were measured monthly in the Dongtan intertidal flat within the Changjiang （Yangtze River） Estuary. Except for NH4^＋, there always showed high fluxes from overlying water into sediment for other four nutrients. Sediments in the high and middle marshes, covered with halophyte and consisting of macrofauna, demonstrated more capabilities of assimilating nutrients from overlying water than the low marsh. Sampling seasons and nutrient concentrations in the overlying water could both exert significant effects on these fluxes. Additionally, according to the model provided by previous study, denitrification rates, that utilizing NO3- transported from overlying water （Dw） in Dongtan sediments, were estimated to be from -16 to 193 μmol·h^-1·m^-2 with an average value of 63 μmol·h^-1·m^-2 （n=18）. These estimated values are still underestimates of the in-situ rates owing to the lack of consideration of DN, i.e., denitrification supported by the local NO3^- production via nitrification.     

Interaction of copper with fatty acids in Soxhlet extraction and its influence

Treatment with metallic copper for the removal of elemental sulfur from bitumen extracted from sedimentary rocks or petroleum is the most widely used method. Little attention has been paid, however, to its disadvantages. It was observed that copper can interact with some polar organic substances during conventional sulfur removal, which can strongly influence the quantitative and qualitative determination of bitumen, as has been confirmed by interaction of long-chain fatty acids with copper. The copper soap generated was analyzed by element analysis, inductively coupled plasma optical emission spectrometry （ICP-OES）, thermal analysis （TG-DSC） and Fourier Transform Infrared spectroscopy （FFIR）. Mechanism of the interaction was investigated and elucidated. Our experimental results would necessitate improvement of the present method for sulfur removal and/or a search for a new one.     

Late Cenozoic Stratigraphy and Paleomagnetic Chronology of the Zanda Basin, Tibet, and Records of the Uplift of the Qinghai-Tibet Plateau

The characteristics of Late Cenozoic tectonic uplift of the southern margin of the Qinghai- Tibet Plateau may be inferred from fluvio-lacustrine strata in the Zanda basin, Ngari, Tibet. Magnetostratigraphic study shows that the very thick fluvio-lacustrine strata in the basin are 5.89- 0.78 Ma old and that their deposition persisted for 5.11 Ma, i.e. starting at the end of the Miocene and ending at the end of the early Pleistocene, with the Quaternary glacial stage starting in the area no later than 1.58 Ma. Analysis of the sedimentary environment indicates that the Zanda basin on the southern Qinghai-Tibet Plateau began uplift at -5.89 Ma, later than the northern Qinghai-Tibet Plateau. Presence of gravel beds in the Guge and Qangze Formations reflects that strong uplift took place at -5.15 and -2.71 Ma, with the uplift peaking at -2.71 Ma.     

中国金矿床(Ⅰ):成矿理论研究新进展

针对中国近年来金矿床学领域研究工作,综合讨论了金矿床成矿学理论研究方面的主要进展。它们集中体现在①大型一超大型金矿床;②区域成矿学与成矿系统;③造山带成矿与造山型金矿：从俯冲（增生）造山到碰撞造山成矿的显著发展;④成矿系列、成矿谱系到成矿体系研究;⑤热点、地幔柱及其多级演化：从边缘成矿到板内成矿;⑥成矿时代：从模糊到精确;⑦现代金矿成矿的实时模型;⑧从板块构造演化、超越板块构造到成矿地球动力学等8个方面。     

舒兰市福安堡钼矿床地质特征及找矿意义

本文较详细地介绍了福安堡中型斑岩钼矿床的地质特征、找矿标志及找矿方法,对在吉林地区北部舒兰—蛟河一带分布的印支—燕山期花岗岩区寻找大、中型斑岩型钼矿床具有重要的指导意义。     

吉林省煤炭资源供需形势及对策

煤炭工业可持续发展必须有煤炭资源作为基础和支撑。近年来我省煤炭资源开发强度大,尚未利用资源中可供建井的资源、储量严重不足,受我省煤炭资源聚煤规律、赋存总量、地质条件和主要预测区勘查程度低等条件的限制,资源勘查形势严峻。通过对吉林省煤炭资源开发情况、煤炭供需形势及预测和存在的突出问题进行分析、研究,提出建议和对策以加大、加快地质勘查力度,保证煤炭资源的接续和供给。