Estimation of subsurface formation temperature in the Tarim Basin,northwest China: implications for hydrocarbon generation and preservation     

Shaowen Liu  Xiao Lei  Changge Feng  Chunyan Hao 《International Journal of Earth Sciences》2016,105(5):1329-1351

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基于层次分析法的德州地面沉降易发区的可拓学划分应用          下载免费PDF全文

张永伟  李红霞  商婷婷  贾超  梁浩  杨亚宾 《山东国土资源》2016,32(7)

基于物元模型的可拓学理论分析,提出华北平原德州地面沉降易发区的可拓学划分方法。利用地面沉降易发性分级、分类标准和影响因子分析,构造出经典域物元和节域物元,应用物元和可拓集合中的关联函数,建立了易发性等级综合评判的可拓评价模型,通过基于层次分析法的可拓学评价分析,采用正方形等间距(2km×2km)剖分了135个网格,再将剖分单元转化成面元,经过等值差分,得到了地面沉降易发区划结果。计算结果显示,可拓学方法能够实现定量化、多因子评价地面沉降易发性等级问题,从而科学合理地指导地面沉降综合分区防治。  相似文献   

青海省祁连县大拉洞柏杨沟矿区煤岩层对比研究          下载免费PDF全文

王立刚  于松  冯园园  赵宝聚  魏伟  王琳琳  薛玉琴 《山东国土资源》2016,32(9)

通过研究太原组的沉积特征及聚煤变化规律,采用了标志层、煤岩层组合特征、层间距、测井曲线形态等方法,对矿区内煤层、岩层进行了综合对比。确定了该区主要煤层的赋存层位、形态、分布及变化特征,对周边地区找煤工作具有一定的指导作用。  相似文献   

Approximate optimal tracking control for near-surface AUVs with wave disturbances     

Qing Yang  Hao Su  Gongyou Tang 《中国海洋大学学报(英文版)》2016,15(5):789-798

This paper considers the optimal trajectory tracking control problem for near-surface autonomous underwater vehicles (AUVs) in the presence of wave disturbances. An approximate optimal tracking control (AOTC) approach is proposed. Firstly, a six-degrees-of-freedom (six-DOF) AUV model with its body-fixed coordinate system is decoupled and simplified and then a nonlinear control model of AUVs in the vertical plane is given. Also, an exosystem model of wave disturbances is constructed based on Hirom approximation formula. Secondly, the time-parameterized desired trajectory which is tracked by the AUV’s system is represented by the exosystem. Then, the coupled two-point boundary value (TPBV) problem of optimal tracking control for AUVs is derived from the theory of quadratic optimal control. By using a recently developed successive approximation approach to construct sequences, the coupled TPBV problem is transformed into a problem of solving two decoupled linear differential sequences of state vectors and adjoint vectors. By iteratively solving the two equation sequences, the AOTC law is obtained, which consists of a nonlinear optimal feedback item, an expected output tracking item, a feedforward disturbances rejection item, and a nonlinear compensatory term. Furthermore, a wave disturbances observer model is designed in order to solve the physically realizable problem. Simulation is carried out by using the Remote Environmental Unit (REMUS) AUV model to demonstrate the effectiveness of the proposed algorithm.  相似文献   

玲珑金矿西山幔源脉岩地球化学特征          下载免费PDF全文

孙雨沁  马晓东  程伟  张岩  李敏 《山东国土资源》2016,32(2)

玲珑西山幔源脉岩主微量元素的变化暗示了源岩很可能经历过类似俯冲带流体的交代作用,矿化流体中含有较高含量的金属矿物,具有Eu的正异常,指示了源区是深源的。脉岩中的CO2来源可能是花岗岩岩浆热液的混入,石英来源于陆壳碎屑物质部分熔融形成的S型花岗岩,硫的来源与幔源脉岩岩浆同源,或来自地幔,或来自地壳深部。  相似文献   

胶东埠上金矿煌斑岩地球化学特征及成因          下载免费PDF全文

马晓东  孙雨沁  孙斌  彭庆吉  夏传波  宋英昕  刘晶  李济 《山东国土资源》2016,32(1)

大量的研究资料表明煌斑岩与金矿在空间上、时间上具明显的对应关系。埠上金矿位于胶东玲珑金矿田西南方向的金岭金矿田的中北部;有关该矿区煌斑岩的研究资料较少。该文结合岩石学、矿物学、大地构造学等特征,对区内煌斑岩的地球化学进行了研究,揭示其内在成因,认为区内煌斑岩是因该区受到古太平洋板块的俯冲、华北板块与杨子板块碰撞造山及郯庐断裂带等构造岩浆活动的影响,俯冲洋壳析出的流体交代地幔形成的具氧化性的EM1型富集型地幔岩浆于造山拉张期在大陆活动边缘浅成侵入而成的。  相似文献   

基于恐龙足迹重建攀西地区白垩纪恐龙动物群   总被引：2，自引：2，他引：0  

曹俊  邢立达  杨更  沈洪江  郑小敏  杨林  刘明  秦永超  张焕新  冉浩  茅磊 《地质通报》2016,35(12):1961-1966

攀西地区没有白垩纪恐龙骨骼化石记录,对该区白垩纪恐龙动物群组合的认识尚属空白。1991年,攀西地区首次发现了恐龙足迹,此后陆续发现了8个足迹点。这些足迹点共发现9种不同的非鸟恐龙足迹(6种非鸟兽脚类、1种蜥脚类和2种鸟脚类足迹),以及翼龙和龟类足迹。共11种足迹形态类型由185道行迹(与孤立足迹)组成,可能代表着同等数量的造迹者。其中飞天山组的组合多样性最强,小坝组和雷打树组较弱。这个相对全面的足迹数据库,为该地区白垩纪四足类的古生态学普查提供了动物群的组成信息,这在该缺乏骨骼化石的地区显得尤为重要。  相似文献   

对湖北大洪山地区一套紫红色砂-砾岩系沉积年代的再认识——碎屑锆石U-Pb年龄及其地质意义   总被引：1，自引：0，他引：1  

张雄  曾佐勋  潘黎黎  曾智辉  彭练红  徐大良  魏运许  刘浩  邓新 《地质通报》2016,35(7):1069-1080

湖北大洪山地区花山群六房咀组之上不整合覆盖了一套紫红色砂-砾岩。这套岩石的沉积时代存在争议,一种观点认为是南华纪早期;另一种观点认为是晚侏罗世。利用LA-ICP-MS分析技术,对这套碎屑沉积岩进行了碎屑锆石U-Pb测年,获得有效年龄数据125组,年龄值变化范围较大(3223~771Ma),主要集中于新太古代末—古元古代早期(约2500Ma)、古元古代(约2000Ma)和新元古代(约800Ma)3个时间段。对比鄂东南地区和三峡地区莲沱组岩石学特征和碎屑锆石年龄分布特征,认为其具有相似的物源,这套岩系沉积时代应该为南华纪早期而非晚侏罗世。综合分析扬子地块的前寒武纪年龄,认为扬子地块可能存在大量未岀露的新太古代末—古元古代早期(约2500Ma)基底,约2500Ma的岩石应该是扬子地块深部基底的重要组成部分。扬子地块存在广泛的古元古代(约2000Ma)岩浆活动,这期岩浆活动可能是Columbia超大陆聚合在扬子地块的响应。新元古代(约800Ma)扬子地块北缘存在Rodinia超大陆裂解同期裂谷,裂谷内基性岩可能为大洪山地区南华纪地层中基性岩砾石的物源。  相似文献   

西藏改则县多不扎地区上侏罗统对望山组的建立及意义   总被引：1，自引：0，他引：1  

董宇超  李才  王明  范建军  吴浩 《地质通报》2016,35(8):1263-1270

对望山组是发育在羌南板块南缘的一套岩石组合,以安山岩、流纹岩、玄武质凝灰岩为主,有少量的玄武安山岩夹层,具有明显的岩浆喷出相和沉积相韵律分布的特点。利用LA-ICP-MS同位素定年技术对对望山组安山岩中的锆石进行了U-Pb同位素测年,获得锆石的~(206)Pb/~(238)U年龄加权平均值为150.5±0.6Ma,表明对望山组的形成时代为晚侏罗世中晚期,在详细剖面测制和区域对比的基础上建立了对望山组。对望山组的建立对完善班公湖-怒江缝合带的地层系统、探讨班公湖-怒江洋的晚侏罗世构造演化具有重要的地质意义。  相似文献   

Effects of size and strain rate on the mechanical behaviors of rock specimens under uniaxial compression     

Qingbin Meng  Mingwei Zhang  Lijun Han  Hai Pu  Hao Li 《Arabian Journal of Geosciences》2016,9(8):527

Size and strain rate are two key factors that dramatically influence the estimation of rock mechanical behaviors. To better understand the effects of size and strain rate on measured rocks, rock specimens with six different sizes were tested at six different strain rates under uniaxial compression using the MTS 815 Rock Mechanics Test System. Having determined that the size and strain rate significantly affect the peak strain, peak stress, elastic modulus, acoustic emission (AE), and failure pattern of the rock specimens, the relation was established between the strength and the size and strain rate of red sandstone. And the variation was revealed among the size and strain rate, the AE, and the failure pattern. It turned out that the peak stress was negatively correlated with the rock size and was positively correlated with the strain rate. When the length to diameter ratio (L/D) of the rock specimen was less than 2.0, the AE appeared mildly. The AE quantities gradually increased before the peak stress, and then sharply decreased after the peak stress. The failure pattern of the rock specimen was relatively complicated, with a fracture plane appearing along the axial direction. Conical failure type was also presented. When the L/D ratio of the specimen was greater than 2.0, the AE characteristics of red sandstone showed the radical model. There were relatively few AE rings before the peak stress. But the AE rings increased suddenly and dramatically during the peak stress. The rock specimens primarily failed with a single shear plane. Moreover, with an increase in the strain rate, the AE activities were enhanced and the AE quantities increased. When the strain rate of the rock specimen was less than 5.0?×?10^?4/s, the rock specimen failed with a shear or tensile-shear pattern. And when the strain rate was greater than 5.0?×?10^?4/s, the rock specimen tended to fail in a conical pattern.  相似文献