滇东曲靖地区下寒武统筇竹寺组泥页岩储层特征研究     

白名岗  张聪  杨玉茹  代峰  熊杰 《地质力学学报》2017,23(6):838-845

下寒武统筇竹寺组页岩是南方页岩气勘查开发重点关注的层位之一,但滇东地区下寒武统筇竹寺组黑色页岩储层研究程度较低。样品采自2014年新钻的曲页1井,对下寒武统筇竹寺组黑色泥页岩进行全岩和粘土矿物X衍射分析、TOC、岩石物性、比表面积等测试和扫描电镜实验,综合分析了滇东曲靖地区筇竹寺组泥页岩储层特征及孔隙类型。结果表明:滇东曲靖地区下寒武统筇竹寺组泥页岩矿物组成主要是石英(44.75%)、粘土矿物(25.47%)、长石(16.44%);发育粒间孔、粒内孔和有机孔3种类型孔隙;有机质孔隙发育,以中孔为主,具有一定的页岩气勘探开发潜力;页岩储层自上而下孔隙体积有逐渐变小的趋势,但在井深400 m~500 m发育高孔隙体积;泥页岩储集性能的重要指标——孔隙度主要受有机质含量及发育程度的制约。  相似文献   

The effect of nitric oxide on the growth of marine phytoplankton   总被引：13，自引：0，他引：13  

ZHANG Zhengbin  LIN Cai  LIU Chunying  SUN Mingyi  DING HaibingThe Institute of Marine Chemistry  Ocean University of China  Qingdao  P.R.ChinaThe University of Georgia  Department of Marine Sciences  Athen GA   《中国海洋大学学报(英文版)》2003,2(2):185-188

The incubation experiments of Skeletonema costatum, Dicrateria zhanjiangensis nov. sp., and Platymonas sub-cordiformis, and those of Emiliania huxleyi were carried out in the Marine Physical Chemistry Laboratory in Ocean University of China and in the Marine Organic Geochemistry Laboratory in the University of Georgia respectively. Nitric oxide was added into the media when these marine microalgae were growing. We found the growth of these four microalgae were promoted or inhibited when nitric oxide of different concentrations was added one or two times each day during the cultivation process. The results are consistent with the influence of nitric oxide on the growth of high plants. The results show that nitric oxide may be a new factor of regulation and control for the phytoplankton growth in seawater.  相似文献   

南宁市空气质量状况特征研究   总被引：2，自引：0，他引：2  

李雄  董惠青 《气象研究与应用》2001,22(4):31-34

通过对南宁市 5个空气质量观测站可吸入颗粒物、二氧化硫、二氧化氮的观测资料进行分析 ,发现 :南宁市首要污染物为可吸入颗粒物 ,5个观测站可吸入颗粒物具有很好的变化趋势一致性 ,二氧化硫变化趋势一致性较差 ,二氧化氮基本没有变化  相似文献   

林州-安阳地区食管癌高发区地下水氮污染及防治措施   总被引：7，自引：0，他引：7  

杨琰  蔡鹤生  刘存富  周爱国 《水文地质工程地质》2002,29(6):8-11

河南省林州市-安阳县是我国著名的食管癌高发区，食管癌严重地危害着当地居民的生命与健康。本文根据饮用水的NO^-3分析资料，阐明了亚硝胺的前体物NO^-3的分布与食管癌的地理分布具有明显的相关性。居民饮用NO^-3超标的浅层地下水，旱井水是导致食管癌的重要原因之一，70年代以来，大量施用化肥是起引饮用地下水NO^-3污染的根本原因，它导致的后果使林州市食管癌发病率和死亡率下降缓慢。本文结合^14C资料对地下水NO^-3-N污染机理进行了分析，并提出了相应的防治措施。  相似文献   

New production in the South China Sea     

Pinghe?CaiEmail author  Yipu?Huang  Min?Chen  Guangshan?Liu  Yusheng?Qiu 《中国科学D辑(英文版)》2002,45(2):103-109

Measurement of²²⁸Ra activities in the upper 300 m water column was conducted at two stations in the South China Sea using an MnO₂-fiber extraction/β-counting technique of²²⁸Ac. Results showed that²²⁸Ra activities ranged from 0.38 to 3.60 Bq · m^-3. The vertical profiles of²²⁸Ra at the time-series station favored a steady state assumption. Based on a one-dimensional steady state model,²²⁸Ra-nitrate coupled approach was applied to stations NS97-43, NS99-53 (T₁), NS99-53 (T₂). New production thus quantified were 4.4, 5.1 and 5.7 mmolC · m^-2 · d^-1, respectively,f ratios in the South China Sea were estimated from the derived new production and the documented primary productivity in the regime, to be 0.12–0.15.  相似文献   

MODEL STUDY OF THE EFFECT OF SOIL NO EMISSIONS ON SURFACE OZONE     

韩志伟  胡非  张美根  朱江 《Acta Meteorologica Sinica》2002,(4)

The effect of soil NO emissions on surface ozone in autumn in East China has been studied byusing TCTM(Troposphere Chemical Transport Model)with the input of meteorological variablesfrom RAMS.The chemical mechanism for ozone variation caused by soil emissions has also beeninvestigated.The model results reveal that soil NO emissions are important to regional ozoneformation and distribution and the effect of soil NO emissions shows spatial inhomogeneity.Ozoneover most areas in northern China decreases with maximum average decrement reaching 5 ppbwhile it increases over most areas of central and southern China with maximum average incrementreaching 7 ppb caused by soil NO emissions.This situation of ozone variation is mainly determinedby nonlinear photochemical mechanism.For the low NOx areas(≤3 ppb),ozone increases as NOxincreases;for the high NOx areas(>3 ppb),ozone decreases as NOx increases.The effect of soilNO emissions on ozone depends on the transition value and NOx concentrations.  相似文献   

闪电产生氮氧化物(LNOX)区域特征计算(Ⅱ): LNOX计算结果分析     

杜健  张义军  言穆弘 《高原气象》2002,21(5):433-440

利用东北、北京和广东三地的闪电定位资料，计算分析了6种不同类型雷暴中闪电产生的氮氧化物总体、季节、空间分布和雷暴的不同发展阶段等特征。结果表明：虽然中高纬地区雷暴频数较低，年总产氮(N)量低于低纬地区，但单个雷暴平均产N量并不比低纬低。三地雷暴产N量的月份分布不相同，东北和北京地区的峰值月份出现在季节交换期的6月和9月，广东地区出现在对流相对旺盛的7月。低纬区的系统雷暴产N量主要发生在成熟阶段，而发展和消散阶段产N量很低，中高纬尽管成熟阶段产N量最高，但发展和消散阶段也有一定的比例。中高纬的局地雷暴产N量主要发生在发展和消散阶段，成熟阶段很低，而广东地区，三个阶段相差不大。进一步讨论了几种雷暴闪电参数与雷暴产生N量的相关性，得到系统雷暴正负闪电总数和雷暴产生N量的回归预报方程并讨论了误差。最后与文献[1]的方法和Price的方法进行了比较。  相似文献   

饮用水NO-3污染与食管癌发病率及死亡率相关性探讨--以河南省林州安阳地区为例   总被引：8，自引：0，他引：8  

蔡鹤生  刘存富  周爱国  杨琰 《地质科技情报》2002,21(1):91-94

阐明了林州市食管癌流行的4个特征。根据46个饮用水的NO3^-分析资料，论证亚硝胺的前体物NO3^-的分布与食管癌的地理分布具有明显的相关性：林州市的发病率是北部高于南部；林州市－安阳县－范县的发病率是西部大于东部。居民饮用NO3^-超标的浅层地下水，旱井水是导致食管癌的重要原因之一。70年代以来，大量施用化肥是引起饮用地下水NO3^-污染的根本原因，它导致的后果是林州市食管癌发病率和死亡率下降缓慢。指出了必须坚持“防霉、去胺、施钼肥、治增生、改变不良饮食习惯”五项预防措施，特别要把饮用水治理好。  相似文献   

The boundary layer characteristics in the heavy fog formation process over Beijing and its adjacent areas   总被引：1，自引：0，他引：1  

ZHANG Guangzhi  BIAN Lingeng  WANG Jizhi  YANG Yuanqin  YAO Wenqing  XU Xiangde 《中国科学D辑(英文版)》2005,48(Z2)

By utilizing the Atmospheric Boundary Layer (ABL) observational data made available from the project "973" under the auspices of the Ministry of Science and Technology of the People's Republic of China - entitled the Beijing City Air Pollution Observation Field Experiment (BECAPEX), including the measurements by a wind profiler, captive airships, tower-based boundary layer wind and temperature gradient observational instruments (ultrasonic anemometers and electronic thermometers), air composition samplers, conventional upper-air, surface and Automatic Weather Stations (AWS) observations, this paper herewith analyzes, in a comprehensive manner, the occurrence of a heavy fog event over Beijing in February 2001, including its formation, development, persistence, dynamic and thermodynamic features as well as evolving stratification structures within the boundary layer at different stages. The results suggested: (i) as a typical case of urban heavy fog, before the fog onset over Beijing, a temperature inversion existed in the lower atmosphere, the smokes and the pollutants like SO2 and NO2 had been accumulated at a lower level. Proceeding the fog event, with the increase of SO2 and NO2 concentrations, condensability increased sharply. On the contrary, during the fog process, with increasing condensability, SO2 and NO2 concentrations decreased. This indicated that, acting as condensation nucleus, these accumulated pollutants were playing a key role in catalyzing the fog condensation. (ii) By analyzing mean gradient-, pulsation- and turbulence-distribution patterns derived from the wind measurements taken by the aforementioned tower-based instruments, they all indicated that about 10 hours before the fog onset, a signal foretelling potential strong disturbances in the lower boundary layer was detected, and a significant rise of both mean and disturbance kinetic energies was observed, revealing that the low-level wind shear was strengthened before the fog onset, consequently creating a favorable condition for the outbreak of turbulences. This strong signal seemed to be very meaningful in monitoring and predicting fog occurrence and its development. (iii) Once the fog was in shape, its condensation feedback effects tended to lift the height of temperature inversion layer within the mid and upper levels of the lower atmosphere, which in return determined the fog persistence and restructuring process.  相似文献   

SPATIOTEMPORAL VARIATION OF NO2 AND SUB-REGIONAL TRANSPORT DURING WINTER POLLUTION EVENTS IN HAIKOU, CHINA     

符传博  丹利  唐家翔  杨薇 《热带气象学报(英文版)》2019,25(3):365-372

An ensemble of satellite measurements, statistic data from government and meteorological diagnosis in regional background site (Haikou, China) has revealed the spatial and temporal characteristics of NO2 and associated synoptic transport patterns over southern China from January 2013 to February 2014. The result shows that: (1) Ozone Monitoring Instrument (OMI) satellite products had a good correlation with observation NO2 in Haikou. The correlation coefficients between Observation NO2 and tropospheric column NO2 and ratio of TroNO2/ TotNO2(tropospheric column NO2/ total column NO2) had all passed the confidence level of 99.9% test. (2) TroNO2 over southern China has an obvious seasonal variation, which is closely coupled with regional meteorology in each season. (3) NO2 concentration in Haikou revealed three pollution periods during December 2013 and January 2014. The variation of NO2 concentration in Haikou is related to the meteorological elements closely. (4) Compared to the monthly mean meteorological fields of the pollution periods, the results indicate that NO2 pollution event in Haikou is directly related to the exogenous transportation from PRD region. An ensemble analysis of meteorological dynamic factors, wind vectors and backward trajectories during the pollution periods further verified this conclusion.  相似文献