辽宁北部秀水盆地秀D1井孢粉组合及其地层意义

孢粉化石采自辽宁省北部秀水盆地的秀D1井,分析、鉴定和系统研究结果表明,来自秀D1井井深62.1~1089.7m的孢粉化石自下而上划分为3个孢粉组合,下部孢粉组合(井深703.85~1089.7m)以Osmundacidites-Klukisporites-Podocarpidites为代表,地质时代为晚侏罗世堤塘期(Tithonian),中部孢粉组合(井深381.5~699.3m)以Densoisporites-Cicatricosisporites-Piceaepollenites为代表,地质时代为早白垩世贝里阿斯期(Berriassian),上部孢粉组合(井深62.1~339m)以Cicatricosisporites-Impardecispora-Pinuspollenites为代表,地质时代为早白垩世凡兰吟期—欧特里夫期(Valanginian-Hauterivian)。秀D1井钻遇地层所含孢粉组合特征在区域上可以与冀北地区大北沟组,辽宁西部地区下白垩统义县组、九佛堂组,松辽盆地东南缘下白垩统火石岭组、沙河子组所产的孢粉组合对比。含孢粉组合地层时代的确定解决了井柱地层的划分,以及与区域地层的对比关系,同时为区域地层古生物研究提供了翔实的基础资料。     

秦岭凤太矿集区铅锌金矿区域成矿规律研究

陕西秦岭凤太矿集区位于商丹缝合带和勉略缝合带之间,是著名的铅锌金多金属矿集区,区内发育海相沉积改造型铅锌矿和构造蚀变岩型金矿,成矿类型多样.在矿床地质特征、成矿地质条件、铅锌金矿时空分布规律、成矿流体来源研究分析的基础上,对凤太矿集区铅锌金矿成矿规律进行了剖析.认为凤太矿集区铅锌金矿床是多种成矿作用叠加改造形成的,早期...     

祁连山北缘深部弧形褶皱—逆冲带及其油气勘探前景

祁连山北缘-河西走廊西段位于青藏高原东北缘,是新生代陆内构造活动最强烈地区。基于野外构造观测、横跨山前及前陆盆地区的三维地震构造分析与解释,结合地震地质属性提取分析,识别出祁连山北缘-酒泉盆地西段窟窿山-柳沟庄带隐伏的弧形褶皱-逆冲带,该弧形构造是造山带基底逆冲构造楔体垂向差异抬升与向前陆方向差异运动的产物;该弧形结构控制本区下白垩统地层裂缝发育、分布与破裂强度,并与本区先期断裂、裂缝带产生构造叠加效应,形成弧形构造“中央强裂缝发育带”,是形成构造裂缝型油气藏的有利区域。     

Centrifuge modelling of ground-borne vibrations induced by railway traffic in underground tunnels

Increased attention has been given to ground-borne vibrations induced by railway vehicles and to the effects of these vibrations as they propagate through the ground into nearby buildings.Various studies,mainly based on numerical methods as well as physical modelling,have been carried out to investigate this problem.To study the dynamic response of tunnels and the surrounding soil due to train-induced vibration loads,a centrifuge te st was conducted with a small-scale model in 1 g and 50 g stres...     

2016年山东一次阵风锋触发的强对流天气分析

利用常规观测、区域自动气象站、NCEP/NCAR再分析和雷达回波资料,对2016年6月30日山东一次阵风锋触发的强对流天气进行了分析。结果表明,此次强对流主要发生在高空槽与副热带高压相互作用、山东高低层受一致西南气流影响的环流形势下,阵风锋、地面辐合线和负变压中心所产生的抬升作用及近地面层冷空气的侵入使气温骤降是触发对流的关键因素。低层水汽充沛、湿层厚,属于上干下湿的不稳定层结。强对流发生区域处在假相当位温差（Δθse）和风暴相对螺旋度（storm relative helicity,SRH）的大值中心及其右侧位置。对流有效位能（convective available potential energy,CAPE）、850 hPa与500 hPa之间温差、大风指数、强天气威胁指数等都对此次强对流有较好的指示作用。0 ℃层高度和融化层高度较高是此次过程未出现大冰雹的原因。较强的0～3 km垂直风切变在强对流预报业务中需要注意。此次强对流过程是线状回波带前侧风暴内出现了阵风锋,阵风锋又不断触发雷暴使个别强单体风暴发展加强成为超级单体风暴,具有持续时间较短的中气旋、高悬的强回波、有界弱回波区、风暴顶辐散、窄带回波、径向速度大值区等回波特征。风暴移动速度比风暴承载层平均风速大,缩短了超级单体存在时间。此外,风暴参数与天气的强烈程度密切相关。     

台湾海峡西部海域沉积体系、地层架构与油气勘探前景

基于台湾海峡西部新采集的高分辨率二维地震资料及钻井数据,结合区域地质资料和前人研究成果,建立台湾海峡西部高精度等时地层格架,在此基础上厘定了地质年代属性和沉积相特征分析。研究表明第四纪地层识别出6个三级层序界面,对应地划分为5个三级层序。研究区地震相主要有席状平行—亚平行地震相、前积地震相、下切谷充填地震相、充填状低连续地震相和充填状杂乱地震相等,不同的地震相及其组合代表特定的沉积体系。通过以上分析可知研究区新生代主要发育于海陆过渡地带,主要发育冲积/洪积平原相和滨岸平原相,在此基础上分析沉积演化特征,为台湾海峡西部海域进行精细勘探提供地质依据,这对将来的油气勘探具有重要的指导意义。     

半干旱地区洪水模拟效果差异性分析及影响因子响应评估

中国北方半干旱地区的降水与下垫面条件具有明显的时空异质性,如何完整准确地描述该类区域的水文过程是当代水文学研究的难点之一.选择半干旱地区水文实验区域——绥德流域和曹坪流域,通过构建不同时空规律的降水场,并结合3种不同产流机制的水文模型,进行大型数值模拟实验,去探究时间、空间、产流机制等因素对半干旱地区洪水模拟的影响,为该类地区水文模型的研制工作提供借鉴.结果 表明:1)半干旱地区中小流域的产流对降雨强度较为敏感,因此降水输入的时间步长对洪水模拟效果的影响程度较大;相比之下,流域雨量站数量的增减,仅体现在降雨分布场的暴雨中心缺失以及面平均降雨量的微小差别,对洪水模拟效果的影响程度较小.2)水文模型能否准确描述主导水文过程是半干旱地区洪水模拟效果优良的关键,流域的尺度效应及其下垫面条件的空间异质性是半干旱地区不同水文模型研制和调整应当优先考虑的问题,无论时间步长、雨量站数量怎么组合,产流结构适宜的模型其模拟效果总是趋于较好的结果.     

Research of the Conductive Structure of Crust and the Upper Mantle beneath the South-Central Tibetan Plateau

With the super-wide band magnetotelluric sounding data of the Jilong (吉隆)-Cuoqin (措勤) profile (named line 800) which was completed in 2001 and the Dingri (定日)-Cuomai (措迈) profile (named line 900) which was completed in 2004,we obtained the strike direction of each MT station by strike analysis,then traced profiles that were perpendicular to the main strike direction,and finally obtained the resistivity model of each profile by nonlinear conjugate gradients (NLCG) inversion. With these two models,we described the resistivity structure features of the crust and the upper mantle of the center-southern Tibetan plateau and its relationship with Yalung Tsangpo suture: the upper crust of the research area is a resistive layer with resistivity value range of 200-3 000 ?·m. The depth of its bottom surface is about 15-20 km generally,but the bottom surface of resistive layer is deeper in the middle of these two profiles. At line 900,it is about 30 km deep,and even at line 800,it is about 38 km deep. There is a gradient belt of resistivity at the depth of 15-45 km,and a conductive layer is beneath it with resistivity even less than 5 ?·m. This conductive layer is composed of individual conductive bodies,and at the south of the Yalung Tsangpo suture,the conductive bodies are smaller with thickness about 10 km and lean to the north slightly. However,at the north of the Yalung Tsangpo suture,the conductive bodies are larger with thickness about 30 km and also lean to the north slightly. Relatively,the conductive bodies of line 900 are thinner than those of line 800,and the depth of the bottom surface of line 900 is also shallower. At last,after analyzing the effect factors to the resistivity of rocks,it was concluded that the very conductive layer was caused by partial melt or connective water in rocks. It suggests that the middle and lower crust of the center-southern Tibetan plateau is very thick,hot,flabby,and waxy.     

渭河盆地地温场分布规律及其控制因素

本文以渭河盆地地温场为研究对象,在收集补充新地热井资料及分析测试样品的基础上,通过盆地深部结构、构造特征、地温场特征、热储层特征、地热资源量等分析,建立了盆地不同岩性岩石热导率与深度关系图版,确定了盆地地温场变化规律及地热田控制因素,提出了渭河盆地地热田形成模式。评价了盆地地热资源有利区,为盆地后续的开发利用提供了理论支持。研究认为渭河盆地热地温梯度分布在2.34～5.85℃/100m之间,平均地温梯度为3.50℃/100m,代表性大地热流68.33mw/m²,地温梯度及不同深度地层温度具有东高西低、南高北低的特点。热导率总体上具有随深度的增加,逐渐增大的规律,热导率随深度增加主要受压实程度增强控制。相同深度条件下泥岩热导率最低,砂岩热导率居中、白云岩热导率最高。渭河盆地主要为层状地热田,盆地内地热通过热传导及热对流两种方式进行传递,以热传导为主。渭河盆地地热资源丰富,热储层可分为三种类型:①新生界砂岩孔隙型;②下古生界碳酸盐岩岩溶型;③断裂型。渭河盆地地热资源有利区主要分布于西安凹陷、固市凹陷。盆地地温场及地热田分布与莫霍面、软流圈上隆、岩石圈厚度减薄的深部背景...     

装配式内藏钢桁架混凝土剪力墙抗震性能试验研究

为了提高装配式剪力墙的抗震性能,提出并设计了一片暗柱内置H型钢装配式内藏钢桁架混凝土剪力墙及一片暗柱内置圆钢管装配式内藏钢桁架混凝土剪力墙,其中H型钢竖向连接采用顶底角钢复合连接,圆钢管竖向连接采用端板焊接.通过对试件进行低周反复加载试验,得到剪力墙试件的破坏模式、滞回曲线、承载力、延性、残余变形、刚度退化和耗能能力等...