共反射元弧叠加方法在火山岩成像中的应用

常规叠加方法假设叠加的地震道集的反射波来自地下同一个反射点,而地表观测到 的反射波场在空间上小于菲涅尔体范围是不可分辨的. 本文根据火山岩体特征,用元弧描述 火山岩的反射界面. 将来自菲涅尔体范围内的反射波沿着元弧界面求和,进而扩大叠加次数 ,达到增加反射信号能量提高地震反射波的叠加成像质量的目的. 文中给出了反射波走时参 数与地下元弧反射界面之间的联系和叠加实现的步骤. 计算结果表明,元弧叠加方法能够提 高剖面的信噪比,增加反射波同相轴的连续性.     

凤凰山地区蒲江-新津-德阳隐伏断裂反射波法地震勘探与断裂活动性研究

利用反射波法地震勘探确定了在凤凰山地区蒲江-新津-德阳隐伏断裂通过的具体位置以及断裂的规模和性质,证明了该断裂在向东俯冲的过程中错切了晚更新统沉积物,具有明显的第四纪活动性,对凤凰山台地的形成起到了一定的控制作用。地面地质调查及历史地震研究也证明蒲江-新津-德阳隐伏断裂具有晚更新世活动性,且断裂南段的活动性明显强于北段,表明该断裂的北段是成都平原内部的一条弱地震活动带。同时,文中还对在城市近郊人烟繁杂地带反射波法地震勘探中野外观测系统的布置及地震参数的选取进行了探索,小道间距、小偏移距、多接收道、短排列、多次覆盖、高频检波器接收的工作方法和野外地震参数的合理选取对实现主要干扰波和反射波信号的有效分离,提高地震勘探分辨率起到了至关重要的作用     

山东招远平度断裂破碎带蚀变岩型矿石类型划分

山东招远-平度断裂破碎带蚀变岩型部分矿石类型划分与实际生产工作相脱离,该文在前人分类的基础上,提出新的定名方案,将矿石类型初步划分为含金蚀变花岗岩、含金黄铁绢英岩、含金硅化黄铁绢英岩、含金硅化岩、含金硅质石英脉和细脉含金硫化物。该划分方案使每一种矿石类型与金品位高低和SiO2含量的多少相联系,并作为找矿标志,操作性强,有利于矿山生产,加快了探矿进度。     

Origin of CO_2 in natural gas from the Triassic Feixianguan Formation of Northeast Sichuan Basin

The natural gas from the Triassic Feixianguan Formation of Northeast Sichuan Basin contains high H2S whereas relatively low CO2 concentrations and the CO2 display high δ13C values (ranging from -5.81‰ to 3.3‰ (PDB)). This seems to contradict the conventional wisdom that TSR should be a primary source of CO2 in natural gas from the Feixianguan Formation. In contrast, many authigenic calcite samples from these sites display very low δ13C values (ranging from -18.4‰ to -10.3‰ (PDB)). This suggests that the carbon from TSR source dominated the formation of calcite whereas the carbon from inorganic source came into CO2 in natural gas. In order to assess the origin of CO2 from these H2S-rich sites, we have calculated the relative contributions of organic and inorganic carbon sources to the CO2 and authigenic calcite. The organic carbon source possibly originated from TSR, whereas the inorganic one might be generated from marine carbonates dissolution. This calculation is based on the carbon isotopic compositions of CO2 and authigenic calcite as well as an isotopic mass balance. The results show that the contribution of organic carbon source to the CO2 is only 2%, whereas that to authigenic calcite is as high as 43% on average. Such results combined with thermodynamic evidence indicate that the isotopically light CO2 produced by TSR process may contribute to authigenic calcite precipitation during burial diagenesis. Distinguishable from Ordovician reservoir of Tarim Basin, Feixianguan reservoir of Northeast Sichuan Basin experienced rapid tectonic uplift due to Yanshanian movement after TSR occurred. Such tectonic event could induce temperature decrease and further promote carbonates dissolution. During these processes, secondary porosity has developed in Feixianguan carbonate reservoirs. Therefore, much attention should be paid to the structural highs in search of high quality carbonate reservoirs.     

The formation and evolution of Chepaizi-Mosuowan paleo-uplift and its control on the distributions of sedimentary facies in the Junggar Basin

The Chepaizi-Mosuowan paleo-uplift is a large-scale uplift stretching across the Junggar Basin formed during the Yanshanian. It has experienced four evolutionary stages: the initial forming stage (J1), the intense development stage (J2+3), the waning and burial stage (K-E), and the tilting and extinction stage (N-Q). The most intense period of activities is the Middle Jurassic. Dur-ing the Early Jurassic, the Chepaizi-Mosuowan paleo-structure was a low amplitude uplift. Because of the subsequent strong upli...     

礁滩体与建设性成岩作用

礁、礁丘、丘同属碳酸盐建隆,礁、滩是重要勘探目的层。但各自在沉积组分、组构、环境和时空分布,以及油气地质条件上迥然不同,因而无论从理论还是勘探实践上,都有必要将其各成体系划分开来。礁滩自身为好储集岩,当建设性成岩作用叠加后可形成好的储层。碳酸盐岩优质储层形成,主要受沉积微相与建设性成岩作用两大因素控制。前者是基础,并以高能的礁滩相带为最好;后者主要包括破裂、白云石化和溶蚀三大类,并以白云石化或溶蚀为最优,其中的溶蚀分布最广泛、影响最深刻而对优质储层形成起决定性作用。礁滩储层中的古岩溶类型最为丰富多彩,包括同生期、准同生期、表生期和埋藏期热流体岩溶的所有类型,白云岩化礁滩体也不例外。其中,同生-准同生期岩溶的形成机制与礁滩沉积时高频层序旋回向上变浅序列的短暂暴露淋溶有关,表生期岩溶则受控于礁滩沉积后三级层序旋回Ⅰ型界面的暴露淋溶。由此,导致礁滩储层中除了可以也是(碳酸盐岩中)唯一保存原生孔隙外,还发育了次生溶蚀孔洞缝和大型溶洞。礁丘、灰泥丘尤其是丘间洼地中发育高有机质丰度烃源岩;它们自身没有有效的原生孔隙,但岩溶作用可以形成次生孔隙。     

硬石膏制硫酸废渣联产水泥——矿产资源节约与综合利用先进适用技术

一、技术类型该技术属非金属矿综合利用技术。二、适用范围该技术适用于以天然石膏、工业副石膏、脱硫石膏等为原料,生产工业硫酸并联产水泥。三、技术内容(一)基本原理以石膏为原料生产硫酸和水泥的基本原理:以焦炭为还原剂,使CaSO4高温分解成CaO和SO2气体。CaO与掺入生料中的SiO2、Al2O3和Fe2O3反应生成水泥熟料,SO2气体随同废气由窑尾排出,经净化、洗涤、干燥、转化。     

Geological and geochemical prediction on deeply-seated ore-bodies in Haigou gold deposit of Jilin,China

Lode 28 is the largest gold-bearing quartz vein in Haigou gold deposit,and the lode itself contains more than 30t of gold. Geochemical study shows that 12 trace elements related gold mineralization can be divided into 5 metallogenic factors(element assemblages) .The high values of F1,F2 and F4 together indicate overlapped of multiple stages of gold mineralization,revealing high potential of gold mineralization at depth;the single high value of F4 represents the root of an existing ore body while high values...     

水平层状介质中侧向电阻率测井快速迭代反演与应用

侧向电阻率测井由于具有较好的探测深度和较高的纵向分辨率而成为油储地球物理测井中的一种重要方法,是确定储层中油气含量的最方要手段。然而,当地层的厚度小于基纵向分辨率时,由于受井眼泥浆和上下围岩等的影响,实测的视电阻率以已无法反映地层电阻率的起初变化,给油气层的划分及油储层的定量评价带有极大的困难,因此,研究侧向电阻率测井反演不论在理论上还是实际应用上均有非常重要的意义。     

锥束CT技术在口腔临床中的应用

将锥束CT应用于口腔部位的三维成像,是近年来CT研究人员和口腔医生共同关注的一个热点.特别是随着牙齿种植技术的兴起,利用CBCT进行牙齿种植计划和手术导板的设计已成为一项新的研究方向.本文综述了口腔CBCT的成像原理和临床应用,比较了CBCT与传统CT在口腔成像中的特点,并总结了当前的关键技术和研究热点,供相关的技术及医学研究人员参考.