The Constitute of Thick Tight Sandstone Belt and the Main Controlling Factors of Effective Reservoir

<正>1 Introduction The western 3D region of the Sulige gas field is located in the Yi-shan slope north of northern Su47 and south of Su48 medium sand belt of the Ordos Basin,the area of it is about 431 km2.The average thickness of He8 is 69.1m,the thickness of it is 83.9m;The effective sand thickness is14.4 m,the thickness of it is 21.5m.     

新疆东部-甘肃北山地区二叠纪玄武岩对比研究及其构造意义

通过对新疆东部三塘湖盆地、甘肃北山柳园地区以及邻区二叠纪玄武岩的地球化学特征对比研究，认识到新疆东部-甘肃北山地区及邻区二叠纪形成的系列断陷带内，同期产生的玄武岩具有不同的地球化学特征和岩浆来源，其形成的统一动力学机制主要是可能由于造山带增厚的岩石圈大范围拆沉而导致的大范围亏损地幔部分熔融岩浆和源自上、下地幔边界的小型地幔柱岩浆的作用。这种地幔柱不是核幔边界深部地幔柱的成因，而可能是早期俯冲洋壳的分离掉落后，中亚造山带范围内可能在上、下地幔之间存在更广泛的部分熔融岩浆的原因。由造山带增厚岩石圈大范围拆沉作用而导致的大范围亏损地幔部分熔融岩浆和源自上、下地幔边界的小型地幔柱岩浆的作用，可能是中亚造山带二叠纪深部壳幔作用最壮观的表现方式。同时也以大范围玄武岩喷发、裂谷、大规模后造山幔源花岗岩和超镁铁岩的侵位以及大规模成矿作用而成为独特的“中亚型造山带”而有别于其它造山带。     

长岭凹陷潜在地热初步探讨

根据长岭凹陷石油井地温测量和物探资料,从地热形成的4要素——储、盖、通、源以及地热具备的地质特征入手,分析了长岭凹陷潜在着地热资源。目前长岭盆地基本具备了储和盖,需要进一步寻找的是通和源。     

内蒙古额济纳旗黑大山锑矿化带化探异常特征及其找矿潜力评价

在内蒙古额济纳旗黑大山地区地处北山锑矿成矿远景区,成矿地质条件十分有利,通过对该区开展区域化探工作,发现了规模较大的以Sb、As为主的综合化探异常,再辅以1:1万的地质、化探综合剖面测量及槽探工程揭露,找到2个锑矿化带(Ⅰ号、Ⅱ号矿化带).对该区找矿潜力进行评价,认为该区具有较大的找矿潜力.     

四川盆地东北地区上二叠统层序地层特征研究

运用层序地层学的原理,在野外剖面沉积相、岩性、岩相和可容空间变化分析的基础上,对川东北地区宣汉县渡口镇羊鼓洞上二叠统剖面的层序地层进行研究,识别出3种类型6个层序界面,将上二叠统划分为1个Ⅱ层序和5个Ⅲ级层序,其中吴家坪组划分为3个Ⅲ级层序、长兴组划分为2个Ⅲ级层序。并在层序划分的基础上建立了川东北地区上二叠统的层序地层格架。将可容空间变化曲线与露头层序地层划分之间进行对比发现,二者之间存在着良好的对应关系。这不仅验证了层序划分的正确性,而且说明了Fischer图解旋回分析技术的实用性和客观性。     

2000-2018年东亚地区云顶高度的时空变化特征

为了了解区域云顶高度对过去气候变化的响应,基于卫星搭载的MODIS传感器提供的2000年3月至2018年2月MOD03_08_v6.0数据,分析了东亚地区云顶高度2000—2018年的时空变化特征,并探讨其长期变化的原因。研究发现,东亚地区云顶高度呈西南高东北低的特征。云顶高度在东亚地区以0.020 km/a的变率增长,其中大陆东部云顶高度的年际变率为0.035 km/a,东部海域年际变率为0.034 km/a。在东部海域地区云顶高度的变化同海表温度的变化相关性较高,相关系数为0.68,这表明云顶高度的变化受下垫面的影响。在东亚地区30°~40°N区域内,年平均云顶高度的增加较为明显。此外,夏季云顶高度在长江中下游盆地、塔里木盆地、吐鲁番盆地以及四川盆地东北部呈-0.03 km/a的减少趋势,这是由于更多低云的形成降低了云顶高度;冬季云顶高度在东亚地区40°N以北呈下降趋势,而在40°N以南呈增加趋势。     

SIMULATION OF BOUNDARY LAYER EFFECTS ON A HEAVY RAINFALL EVENT CAUSED BY A MESOSCALE CONVECTIVE SYSTEM OVER THE YELLOW RIVER MIDSTREAM AREA

A heavy rainfall event caused by a mesoscale convective system (MCS), which occurred over the Yellow River midstream area during 7–9 July 2016, was analyzed using observational, high-resolution satellite, NCEP/NCAR reanalysis, and numerical simulation data. This heavy rainfall event was caused by one mesoscale convective complex (MCC) and five MCSs successively. The MCC rainstorm occurred when southwesterly winds strengthened into a jet. The MCS rainstorms occurred when low-level wind fields weakened, but their easterly components in the lower and boundary layers increased continuously. Numerical analysis revealed that there were obvious differences between the MCC and MCS rainstorms, including their three-dimensional airflow structure, disturbances in wind fields and vapor distributions, and characteristics of energy conversion and propagation. Formation of the MCC was related to southerly conveyed water vapor and energy to the north, with obvious water vapor exchange between the free atmosphere and the boundary layer. Continuous regeneration and development of the MCSs mainly relied on maintenance of an upward extension of a positive water vapor disturbance. The MCC rainstorm was triggered by large range of convergent ascending motion caused by a southerly jet, and easterly disturbance within the boundary layer. While a southerly fluctuation and easterly disturbance in the boundary layer were important triggers of the MCS rainstorms. Maintenance and development of the MCC and MCSs were linked to secondary circulation, resulting from convergence of Ekman non-equilibrium flow in the boundary layer. Both intensity and motion of the convergence centers in MCC and MCS cases were different. Clearly, sub-synoptic scale systems in the middle troposphere played a leading role in determining precipitation distribution during this event. Although mesoscale systems triggered by the sub-synoptic scale system induced the heavy rainfall, small-scale disturbances within the boundary layer determined its intensity and location.     

Assessing the Influence of the ENSO on Tropical Cyclone Prevailing Tracks in the Western North Pacific

Using a statistical model for simulating tropical cyclone (TC) formation and a trajectory model for simulating TC tracks, the influence of the El Nino-Southern Oscillation (ENSO) on the peak-season (July-September) TC prevailing tracks in the western North Pacific basin is assessed based on 14 selected El Nino and 14 selected La Nina years during the period 1950-2007. It is found that the combination of statistical formation model and a trajectory model can simulate well the primary features of TC prevai...     

几种再分析地表气温资料在中国区域的适用性评估

应用台站观测资料对ERA-40、NCEP/NCAR、NCEP/DOE和JRA-25等几种再分析地表(2m)气温资料在中国不同区域、不同年代和季节的气候均值、年际变化和变率特征及其气候趋势等所反映出来的适用性问题进行了系统评估.结果表明,几种再分析产品在全国大多数地区的气候变化研究中都具有一定的合理性,特别是1979年以后的资料可靠性更高一些.但相比而言,它们在冬季的可信度一般要高于夏季,东部地区的可信度一般要高于西部地区;ERA-40和JRA-25再分析产品的适用性要高于NCEP/NCAR和NCEP/DOE再分析产品;其中,JRA-25在均值、年际变化和变率特征的描述上具有更高的可靠性,而ERA-40在长期气候变化趋势(44年)的描述上则要明显优于NCEP/NCAR再分析产品.