临南洼陷临邑断层封闭性的模糊综合评价

临南洼陷是惠民凹陷的生烃中心,临邑断层作为临南洼陷的主控断层对油气的运移和聚集起着重要的作用,弄清临邑断层的封闭性具有重要意义.影响断层封闭性的主要因素有断层的力学性质、几何性质、断面所受正应力、断层两侧的界岩关系以及泥岩涂抹系数5个方面.运用模糊数学的方法对影响断层封闭性的5个因素进行了定量评价,结果表明,影响本区断...     

东西湖区小型化工厂的雷电防护现状与管理方法

近年来,随着经济迅速发展,工业化、城市化和信息化的不断推进,对于东西湖区这样一个拥有保税物流中心和国家级高科技开发园区以及武汉临空港经济技术开发区的地区而言,管理好不断涌入的大量小型化工厂雷电防护设施,显得尤为迫切。如果雷电防护安全管理不到位、措施不完善,将有可能造成重大雷电安全事故隐患,严重威胁企业的安全生产和人身财产安全。因此,对于化工厂特别是小型化工厂雷灾隐患的消除,已成为各级政府和相关部门的当务之急。     

Meiofauna distributions at the oxygen minimum zone in Changjiang (Yangtze) River Estuary waters

1 IntroductionOxygen minimum zone (OMZ) is a midwaterregion in the open ocean where dissolved oxygen con-centrations fall below 0.5 ml/L (0.714 mg/dm3,Kamykowski and Zentara, 1990; Levin et al.,1991). It results from the biological oxygen demandand is wel…     

德南洼陷下第三系低熟油灶的油气运移分配

德南洼陷沙三段（Es3)油灶的低熟度大大降低了德南洼陷的勘探成功率，泥岩压实曲线推测和油气显示资料表明，Es3低熟油灶的油气初次运移主要指向沙四段（Es4)储层，射线追踪法和探井油气显示资料表明德南洼陷油气再次运移分配主要受运移路线，距油灶的远近等因素影响，运移优选通道是近油灶的灰岩裂缝，综合研究认为该区的有利勘探层位是Es4，有利圈闭位于近油灶的两个Ⅰ类油气运移分配单元内，以灰岩中的砂层夹层为主要目标。     

胶州湾大沽河口小型底栖动物分布的季节变动

Sediment samples were collected in the intertidal zone of the Dagu River Estuary, Jiaozhou Bay, China in April,July and October 2010 and February 2011 for examining seasonal dynamics of meiofaunal distribution and their relationship with environmental variables. A total of ten meiofaunal taxa were identified, including free-living marine nematodes, benthic copepods, polychaetes, oligochaetes, bivalves, ostracods, cnidarians, turbellarians,tardigrades and other animals. Free-living marine nematodes were the most dominant group in both abundance and biomass. The abundances of marine nematodes were higher in winter and spring than those in summer and autumn. Most of the meiofauna distributed in the 0–2 cm sediment layer. The abundance of meiofauna in hightidal zone was lower than those in low-tidal and mid-tidal zones. Results of correlation analysis showed that Chlorophyll a was the most important factor to influence the seasonal dynamics of the abundance, biomass of meiofauna and abundances of nematodes and copepods. CLUSTER analysis divided the meiofaunal assemblages into three groups and BIOENV results indicated that salinity, concentration of organic matter, sediment sorting coefficient and sediment median diameter were the main environmental factors influencing the meiofaunal assemblages.     

A case study of mesoscale convective band (MCB) development and evolution along a quasi-stationary front

This paper presents a case study of mesoscale convective band （MCB） development along a quasi-stationary front over the Seout metropolitan area.The MCB,which initiated on 1500 UTC 20 September 2010 and ended on 1400 UTC 21 September 2010,produced a total precipitation amount of 259.5 mm.The MCB development occurred during a period of tropopause folding in the upper level and moisture advection with a low-level jet.The analyses show that the evolution of the MCB can be classified into five periods：（1） the cell-forming period,when convection initiated; （2） the frontogenetic period,when the stationary front formed over the Korean peninsula; （3） the quasi-stationary period,when the convective band remained over Seoul for 3 h; （4） the mature period,when the cloud cover was largest and the precipitation rate was greater than 90 mm h-1; and （5） the dissipating period,when the MCB diminished and disappeared.The synoptic,thermodynamic,and dynamic analyses show that the MCB maintained its longevity by a tilted updraft,which headed towards a positive PV anomaly.Precipitation was concentrated under this area,where a tilted ascending southwesterly converged with a tilted ascending northeasterly,at the axis of cyclonic rotation.The formation of the convective cell was attributed in part by tropopause folding,which enhanced the cyclonic vorticity at the surface,and by the low-level convergence of warm moist air and upperlevel divergence.The southwesterly flow ascended in a region with high moisture content and strong relative vorticity that maintained the development of an MCB along the quasi-stationary front.     

辽河东部凹陷牛居—长滩洼陷沙河街组天然气成因类型及来源

为了研究辽河东部凹陷牛居—长滩洼陷沙河街组天然气地球化学特征、成因类型及来源,基于天然气组分、稳定碳同位素和轻烃组成特征并结合地质背景,对其进行了分析和探讨。研究结果表明：研究区天然气组分以甲烷为主,重烃含量相对较高,主要表现为湿气特征,非烃气体主要是N₂和CO₂;天然气δ¹³C₁值在-43.10‰～-31.20‰之间,δ¹³C₂值在-30.00‰～-24.70‰之间,同源不同期次天然气的混合导致出现天然气碳同位素倒转现象;气源岩有机质类型以偏腐殖型-腐殖型为主。利用δ¹³C-R_o关系,并结合成熟度-深度关系曲线对天然气成熟度进行标定,研究区的中南部天然气为成熟煤型热解气,来源于沙三上亚段烃源岩,而北部天然气为来源于沙三中、下亚段烃源岩的油型-煤型裂解气。     

对山西省繁峙县龙池河铁矿矿床成因及找矿标志的分析

本文通过对繁峙县龙池河矿区铁矿成矿区域地质背景、矿床地质特征、矿床成因及找矿标志论述,针对五台群石咀亚群金刚库组（W1j）火山沉积变质型磁铁矿床的赋矿特点,明确了条带状磁铁石英岩是重要的找矿标志层。磁铁石英岩层紧闭式褶皱部位与呈东北-西南走向、形状较为规则且有宽缓变化趋势的磁异常是找矿的重要标志。     

浙江桐庐附近帚形构造与其他小型构造之关系

帚形构造为李四光教授于重庆北温泉调查时所命名,并为文详细讨论,当时因限有力证据,其真实情形,有期异日作更进一步研究,本年春作者等于浙江桐卢县城附近,复遇此种构造,其露头由公路之开?,颇适观察,故