二叠系火山碎屑岩气藏天然气地球化学特征及气源分析——以四川盆地成都—简阳地区永探1井为例     

田兴旺  罗冰  孙奕婷  刘冉  李亚  陈延贵  周春林  汪华  李亚丁  王尉  王云龙  杨岱林 《吉林大学学报(地球科学版)》2021,51(2):325-335

2018年12月底,在四川盆地二叠系火山岩发育地区部署的风险探井永探1井测试获得22.5万m³/d的高产工业气流,实现了二叠系火山碎屑岩的重大勘探突破,展现了火山碎屑岩气藏的巨大勘探潜力。本文根据该钻井成果资料,应用分析化验数据,采用不同地区气-气对比方法,开展了成都—简阳地区天然气地球化学特征分析、源-储接触关系解剖及气源综合对比。在此基础上,对二叠系火山碎屑岩气藏天然气成因进行了鉴别,对天然气来源进行了判识。结果表明：永探1井火山岩气藏天然气均为典型的干气,干燥系数达0.997,CH₄质量分数高,平均为99.03%,C₂H₆质量分数低,平均为0.35%,C₃H₈几乎没有,不含H₂S;天然气甲烷、乙烷碳同位素值均较轻,甲烷碳同位素平均值为-32.17‰,乙烷碳同位素平均值为-34.27‰,且岩心及镜下可见大量残余沥青,天然气成因鉴别分析表明永探1井火山岩气藏天然气为原油二次裂解气;通过源-储接触关系解剖以及天然气甲烷、乙烷碳同位素对比分析,表明永探1井火山碎屑岩气藏天然气主要来源于德阳—安岳台内裂陷内发育的巨厚下寒武统筇竹寺组优质烃源岩,部分来源于中二叠统。  相似文献   

Effect of freeze–thaw cycles on strength and ductility and microstructure of cement-treated silt with polypropylene fiber     

Kou  Hai-lei  Liu  Jia-hui  Guo  Wei  Hua  Su-dong  Pan  Yu-tao 《Acta Geotechnica》2021,16(11):3555-3572

Acta Geotechnica - In this paper, the strength, ductility and microstructure behavior of cement-treated silt with polypropylene fiber was studied by a host of experimental studies. The influence of...  相似文献   

THE TEMPORAL AND SPATIAL DISTRIBUTION OF SEA SURFACE WIND ALONG THE COAST OF GUANGDONG PROVINCE IN CHINA     

廖菲  邓华  陈柏纬 《热带气象学报(英文版)》2019,25(1):129-140

Temporal and spatial distribution characteristics of sea surface wind in Guangdong''s coastal areas were analyzed with data from four offshore observational stations between 2012 and 2015. The results are shown as follows: (1) The probability distribution of wind speed was basically consistent with Gaussian distribution characteristics; winds of Beaufort force 6 or higher were observed mainly in far offshore stations from October to March. (2) The probability distribution of wind direction was represented well by Weibull distribution. The deviation of wind direction of far station was relatively small for it was mainly controlled by monsoon over the South China Sea, while the near offshore station had a relatively large diurnal variation because of the influence of local synoptic systems such as sea-land breeze. (3) There were significant seasonal differences in wind speed and direction observed by different offshore observational stations. In strong wind seasons, the deviation of wind direction was relatively small while the deviation of wind speed was relatively large, and vice versa. In contrast with Class I station, the other three stations exhibited approximately normal distribution of wind direction and wind speed deviations. (4) Wind direction diurnal variation was moderate in windy periods, while it was obvious in relatively lower speed conditions. The deviation of wind speed in windy periods was generally greater because it was influenced by mesoscale weather systems for 10-20 h, and the influence was complicated, resulting in greater local differences in wind speed.  相似文献   

热带气旋“Malakas”与中纬度系统的相互作用及其结构变化     

刘凡  陈华 《气象科学》2019,39(5):666-674

本文利用中尺度数值模式WRF和LAGRANTO轨迹模式对2010年变性台风"Malakas"进行数值模拟和轨迹分析,分析了Malakas在变性过程中与中纬度系统的相互作用,以及在相互作用过程中Malakas的结构变化特征。结果表明:Malakas变性过程经历了三个阶段:(1)高层扰动加强期,高层的正位涡产生的气旋性环流使低层Malakas中心北部的斜压带西侧产生负的温度平流,表现为冷空气的入侵;(2)Malakas和中纬度系统相互作用时期,台风北上导致斜压带出现,深对流的爆发使低层暖湿气流沿着斜压带上升,快速上升气流中的潜热释放导致低PV空气向对流层上部净输送,在其北部高层重新构建出一个脊;(3)Malakas变性成温带气旋,残存的台风内核与斜压带逐渐合并,负的位涡平流带着非绝热外出流驱动了下游最初脊的构建,加速并且固定了中纬度急流,并整体放大了上层Rossby波模式。  相似文献   

基于WRF模式的风电场短期风速集成预报方法研究     

叶小岭  支兴亮  邓华 《气象》2019,45(1):88-98

风能始源于大气的运动,具有很大的随机性和间歇性。风速预测是风电场风功率预测的基础,其准确性具有重要的意义。对于复杂地形条件下,风速的预报一直是各国研究的难点和重点。为了提高风电场短期风速预报的准确性,本研究采用多种边界层参数化方案来集成预报风速,将各单一边界层参数化方案预报的风速及相应的实测风速数据,应用随机森林算法建立集成预报模型,对风电场的短期风速进行集成预报研究。试验结果表明,采用集成预报风速方法,预报的风速误差相比于单一边界层参数化方案预报的风速误差明显减小,对研究区域的风速、风向等气象要素有着较好的模拟效果,能够有效提高风速预报的准确率。  相似文献   

层状地基端承桩扭转动力阻抗研究     

王海东  尚守平  童桦 《地震工程与工程振动》2007,27(1):171-175

本文采用Novak薄层法推导粘弹性地基的扭转动力阻抗,并将其用于考虑桩土相互作用的单桩扭转动力阻抗,又通过传递矩阵法将此公式推广到求取层状地基单桩扭转动力阻抗。而且本文以工程中常用的端承桩为例,推导了层状地基中端承桩扭转动力阻抗的简化计算公式。根据此公式,分析了频率、上覆软土层厚度、上覆软土层刚度等因素对单桩扭转动力阻抗的影响,分析结果表明,随着振动频率提高,层状地基中端承单桩的扭转动力阻抗的实部有缓慢下降的趋势,而虚部则增大;随着上覆土层厚度的增加,层状地基中端承单桩的扭转动力阻抗的实部和虚部均减小;随着上覆土层刚度的减小,层状地基中端承单桩的扭转动力阻抗的实部减小,虚部在低频段减小,而在较高频率段则增大。  相似文献   

渔洞水库地区地震活动性和构造应力场分析     

樊跃新  王绍晋  管丽霞  非明伦  谢英情  冉华  王兰兰 《地震研究》2007,30(1):29-34

统计了渔洞水库的水位变化规律,分析了水库蓄水前后库区及其附近地区的地震活动性和构造应力场特征。结果表明,水库蓄水前后研究区地震活动的图像、强度和频次都没有明显变化;水库蓄水和水位变化对研究区构造应力场没有明显的影响。  相似文献   

协调大集合模拟下全球海表面温度对北极对流层早冬增暖的影响          下载免费PDF全文

Lutao Wang  Yongqi Gao  Dong Guo  Tao Wang  Ying Zhang  Wei Hua 《大气和海洋科学快报》2021,14(1):57-62

本文使用六个不同的最新大气模式进行了协调数值集合实验,评估和量化了全球海表面温度(SST)对1982-2014年冬季早期北极变暖的影响.本研究设计了两组实验:在第一组(EXP1)中,将OISSTv2逐日变化的海冰密集度和SST数据作为下边界强迫场;在第二组(EXP2)中,将逐日变化的SST数据替换为逐日气候态.结果表明...  相似文献   

Ballasting outside port to prevent spread of butyltin from merchant ships     

Jian Hua  Shiu-Mei Liu 《Ocean Engineering》2008,35(14-15):1505-1511

Most international discussions on ballast water management onboard ships have been virtually on the prevention of the transport of biotic alien species. This study focuses on how to improve this limited knowledge regarding the transport of butyltin compounds via ballasting. Butyltin compounds in ballast water, extracted from three sea-going merchant ships with similar voyage routes and berth ports but with different ballasting practices, were determined. Only monobutyltin (8–57 ng l^?1) and dibutyltin (10–32 ng l^?1) onboard two general cargo ships were detected in the ballast water taken outside the ports. In contrast, significant tributyltin (23–93 ng l^?1) was detected onboard the container ship in the ballast water pumped inside the loading/unloading ports. The comparison results from this study indicate that the risk of tributyltin transfer may be effectively prevented by ballasting outside the ports.  相似文献   

Evidence for the 8,200 a <Emphasis Type="SmallCaps">b</Emphasis>.<Emphasis Type="SmallCaps">p</Emphasis>. cooling event in the middle Okinawa Trough     

Hua?YuEmail author  Yingqian?Xiong  Zhenxia?Liu  Serge?Berné  Chi-Yue?Huang  Guodong?Jia 《Geo-Marine Letters》2008,28(3):131-136

Based on new and existing data on oxygen isotopes, alkenone-surface seawater temperature trends, planktonic foraminifers, lithology, and clay mineral composition of piston cores, a distinct cooling event has been identified around 8,200 cal a b.p. in the middle Okinawa Trough, northwest Pacific. This corresponds to the 8,200 a b.p. cooling event recorded in many places of the Northern Hemisphere. During this event, the local temperature decreased by 1°C, and the δ¹⁸O value increased by 0.6‰. A strengthened Asian winter monsoon is the most probable cause for this event, which thus adds further credibility to the contention that we are dealing here with a global phenomenon.  相似文献