探测仪器特性曲线异常分析

探测仪器感应曲线发生变化,造成升速异常、等压面的温度、湿度错误、雷达〖CD*2〗气压高差偏大、时间〖CD*2〗高度线曲变化异常造成的规定高度上的风误差偏大,使部分资料或整份资料失真,影响探测准确性。本文主要从仪器的感应曲线变化后对各气象要素产生的影响进行分析,得出结论：不同的元件变性对气象要素产生的影响不同,气压变化的影响侧重于高差和升速,温度变化则侧重于规定等压面的温度绝对误差和规定等压面高度的偏差。采用绝对误差计算、加密气象要素计算等方法,结合图形、数据对比,可以确定感应曲线变化时间,从而及时、有效的对探测数据做出合适的处理,进一步提高探测数据的精准度。     

东亚季风的准两年振荡及其与ENSO变率的联系

运用小波分析方法和相关分析对东亚季的准两年振荡的存在及其与ＥＮＳＯ变率的关系进行了研究,结果指出：东亚季风具有显著的准两年振荡特征,但周期与振幅具有明显的年代际变化,同时东亚季风的ＱＢＯ过程与ＥｌＮｉｎｏ事件具有密切的联系;     

鄂尔多斯盆地子洲气田上古生界山西组、下石盒子组储集层特征对比研究

鄂尔多斯盆地子洲气田山西组山23段和下石盒子组盒8段是该区天然气的主力储集层, 但其产能却存在很大差异.应用薄片鉴定、扫描电镜、高压压汞、恒速压汞及岩心分析资料, 分别对该地区上古生界山西组山23段和下石盒子组盒8段储集层进行了研究.子洲气田山23储层以石英砂岩为主, 孔隙类型多样, 粒间孔、溶孔、晶间孔发育, 喉道类别以微—细喉为主, 属相对低孔高渗型储层; 盒8储层则以岩屑砂岩为主, 孔隙类型主要为岩屑溶孔和晶间孔, 喉道类别以细—微喉为主, 属于相对低孔低渗型储层.山23段和盒8段储集层岩石类型、孔隙结构差别巨大, 造成了其储集性能的差异性.不同的沉积环境和成岩作用是造成其差异性的主要原因.     

Investigation of inner-basin variation: Impact of large reservoirs on water regimes of downstream water bodies

Large dams and reservoirs alter not only the natural flow regimes of streams and rivers but also their flooding cycles and flood magnitudes. Although the effect of dams and reservoirs has been reported for some vulnerable locations, the understanding of the inner-basin variation with respect to the effects remains limited. In this study, we analyse the Three Gorges Dam (TGD) built on the Changjiang mainstream (Yangtze River) to investigate the dam effect variations in the system of interconnected water bodies located downstream. We investigated the effect of flow alterations along the downstream river network using discharge time series at different gauging stations. The river–lake interactions (referring to the interactions between the Changjiang mainstream and its tributary lakes i.e. the Dongting and Poyang lakes) and their roles in modifying the TGD effect intensity were also investigated in the large-scale river–lake system. The results show that the water storage of the tributary lakes decreased after the activation of the TGD. Severe droughts occurred in the lakes, weakening their ability to recharge the Changjiang mainstream. As a consequence, the effect of the TGD on the Changjiang flow increase during the dry season diminished quickly downstream of the dam, whereas its impact on the flow decrease during the wet season gradually exacerbated along the mainstream, especially at sites located downstream of the lake outlets. Therefore, when assessing dam-induced hydrological changes, special attention should be paid to the changes in the storage of tributary lakes and the associated effects in the mainstream. This is of high importance for managing the water resource trade-offs between different water bodies in dam-affected riverine systems.     

塔里木盆地塔中低凸起地层水化学特征对不整合的响应

对塔中低凸起地层水化学特征与不整合之间关系的研究结果表明,地层水化学特征对不整合具有很好的响应。在遭受强烈抬升和剥蚀、之间形成不整合的奥陶系和志留系,以及紧靠不整合面附近的石炭系CⅢ油组,其地层水具有矿化度、Cl-含量、K Na 含量和r(Cl-Na)/rMg值相对较小,而HCO3-含量、rNa/rCl值和rSO42-×100/rCl值相对较大的特点,反映出地质历史时期大气降水的影响。在志留系与石炭系之间以及志留系与奥陶系之间的不整合面附近,地层水的矿化度、r(Cl-Na)/rMg值和B3 含量变小,而rNa/rCl值和rSO24-×100/rCl值变大,具有典型的遭受大气淋滤的地层水化学基本特征。     

北秦岭地区三叠纪南召盆地演化及成因机制探讨

秦岭造山带作为中国中央造山带的重要组成部分,还原其复杂、漫长的演化历史始终是地质科学的研究焦点,也是亟待解决的关键科学问题。前人从构造地质学、变质岩石学等方面展开了丰富的讨论,但始终缺乏造山带内同沉积记录的精细研究。南召盆地作为北秦岭造山带唯一保存的三叠纪的地层,为研究秦岭造山带印支期的构造环境提供了最直接可靠的证据。因此本文基于精细的地质图分析,野外地质观察,利用盆地构造沉降和构造年代格架的分析方法,系统研究三叠纪南召盆地的沉积充填和沉降特征,总结出南召盆地的伸展裂陷沉积序列：底部砾岩向上迅速水体加深,形成以灰黑色页岩为主的深湖相,随后向上变为以黄褐色砂岩夹灰黑色泥岩为特征的湖泊三角洲—辫状河相;明确了快速—缓慢沉降的伸展型盆地沉降特征;厘定了南召地区的8个主要不整合面,其中,中-上三叠统太山庙组的底部为一个763~121.9 Ma的穿时不整合面;确定了南召盆地4期主要演化阶段。研究表明：南召盆地是一个伸展裂陷盆地,形成于加里东运动、印支运动共同作用产生的造山带复合基底之上,发育于印支期北秦岭造山带两次重要隆升事件之间,代表晚三叠世卡尼阶的北秦岭造山带构造活动的暂停。

     

打好“桥”牌,顺利实现舟山市由海岛经济向半岛经济的转型

2008年,浙江省舟山市这个千岛城市将成为半岛城市,其海岛经济也将向半岛型经济转变.实现这个经济转型,首先全市上下应提高思想认识,其次三大产业的发展上要有新调整,在主攻海洋经济时,应将长三角和全国作为发展的腹地,凸现半岛在经济发展中的优势,还应处理诸如发展经济与保护资源环境等方面的关系.     

四维地震资料处理及其关键

四维地震利用时延三维地震资料的差异来解释地下储层流体的变化，时延地震资料的差异除了受地下储层流体因素的影响外，还受采集和处理因素的影响。为了尽可能的减少或消除由非储层因素所引起的差异，四维地震资料处理总的要求是相对振幅保持处理，高信噪比处理和一致性处理，一致性处理是四维地震资料特有的处理，其一般处理原则是：（１）调查影响四维地震资料非穗生的原因；（２）保持处理流程的一致性；（３）尽量保持相同的偏移     

川滇地区电离层多参量异常监测系统的设计与实现

介绍了川滇地区电离层多参量异常监测系统的设计思路与功能实现,并将该系统应用于2019年6月17日四川长宁MS6.0地震的监测试验.结果表明:该系统实现了全球和中国区域垂直总电子含量VTEC、站点VTEC和F2层临界频率foF2异常变化的实时监测,有助于开展示范性地震电离层异常监测工作,其图形及数据结果可为地震-电离层异...     

Permian High Ba-Sr Granitoids: Geochemistry, Age and Tectonic Implications of Erlangshan Pluton, Urad Zhongqi, Inner Mongolia

Abstract: Erlangshan Pluton from Urad Zhongqi, central Inner Mongolia, is located in the middle segment of the northern margin of the North China Plate. The rocks consist mainly of diorites with gneissic structure. Petrochemical characteristics reveal that the diorites belong to metaluminous, high-potassium calc-alkaline series, with chemical signatures of I-type granites. They are characterized by low SiO2 contents (56.63%–58.53%) and A/CNK (0.90–0.96), high Al2O3 contents (17.30%–17.96%) and Na2O/K2O ratios (1.20–1.70), enrichment in large ion lithophile elements (LILE, e.g., Ba=556–915 ppm, Sr=463–595 ppm), and relative depletion in high field strength elements (HFSE, e.g., Nb, Ta, Ti) in primitive mantle-normalized spidergram, and right-declined rare earth element patterns with slightly negative Eu anomalies (d?Eu=0.72–0.90). They have Sr/Y ratios (20–25) evidently less than Kebu Pluton (49–75) to its east. Sensitive high resolution ion micro-probe U-Pb zircon dating of the diorites has yielded an intrusive age of 270±8?Ma. This leads us to conclude that Erlangshan diorites were formed by mixing between the middle or lower crustal-derived magma and minor mantle-derived mafic magma, followed by fractional crystallization, which was trigged by crustal extension and fault activity in post-collisional setting.