丘陵油田侏罗系成岩作用与储层物性条件分析

利用铸体薄片、扫描电镜、物性和Ｘ－衍射分析资料,综合分析研究了吐鲁番－哈密盆地丘陵油田的油气储集层特征．侏罗系河道砂体和三角洲前缘砂体构成了丘陵地区主要的油气储集层．砂岩储层的储集空间包括粒间孔隙、残余粒间孔隙、溶蚀粒间孔隙、溶蚀粒内孔隙、填隙物内孔隙和裂缝孔隙．次生溶蚀孔隙和裂缝孔隙改善了砂岩储集层的孔隙结构．     

真空预压法在连云港潮间带软基加固工程中的应用

以实际工程为例,论述了真空预压排水固结法加固连云港沿海地区潮间带软土地基的原理和施工要点,对工程实际的观测结果进行了深入分析。实践证明,使用真空预压法,对地基施加相当于80kPa荷载的真空压力,100d后地基的总沉降量可达到1m,地基土的平均固结度超过80％,经过加固的地基土抗剪强度明显增加,地基承载力基本满足后续施工要求。表明真空预压法适用连云港沿海潮间带软基加固,效果明显。     

Mercury fluxes from air/surface interfaces in paddy field and dry land

In order to provide insight into the characteristics of Hg exchange in soil/water-air surface from cropland (including paddy field and dry land), Hg fluxes were measured in Chengjiang. Mercury fluxes were measured using the dynamic flux chamber method, coupled with a Lumex® multifunctional Hg analyzer RA-915⁺ (Lumex Ltd., Russia). The Hg fluxes from paddy field and dry land were alternatively measured every 30 min. Data were collected for 24-48 h once per month for 5 months. Mercury fluxes in both fields were synchronously measured under the same conditions to compare Hg emissions between paddy field and dry land over diurnal and seasonal periods and find out what factors affect Hg emission on each surface. These results indicated that air Hg concentrations at the monitoring site was double the value observed at the global background sites in Europe and North America. The Hg release fluxes were 46.5 ± 22.8 ng m⁻² h⁻¹ in the warm season, 15.5 ± 18.8 ng m⁻² h⁻¹ in the cold season for dry land, and 23.8 ± 15.6 ng m⁻² h⁻¹ in the warm season, 6.3 ± 11.9 ng m⁻² h⁻¹ in the cold season for paddy field. Solar radiation is important in the emission of Hg over both sites. Hg exchange at the soil/air and water/air interfaces showed temporal variations. The amount of Hg emission from dry land was higher than that from the paddy field, and the emission in daytime was higher than that at night. Moreover, Hg emissions from land covered by crops, was lower than that for bare land.     

登陆我国热带气旋中心最低气压和最大风速关系研究

热带气旋(TC)登陆时中心最大风速会发生明显衰减,研究此时的风压关系对风暴潮模拟和预测具有重要意义。采用中国气象局上海台风研究所数据资料,对1949—2016年风压关系序列的一致性进行检验,登陆风压关系公式拟合及误差分析。结果表明:1970s后风压关系发生变异;新公式在计算登陆风速时要优于原公式,尤其是大风速情况下;相同气压下台风在近岸时风速明显小于大洋中,且登陆时风速越大衰减越剧烈。     

城市可持续发展系统空间分析

以可持续发展理论为指导,论述了城市可持续发展系统的理论框架、模型体系及评估体系。从系统的角度对城市可持续发展系统进行了剖析,认为城市可持续发展系统是由三要素、三层次构成的多维立体的社会发展系统;在技术方法上,采用了以“3S”技术为支撑的空间分析方法和模型;在城市可持续发展评估指标体系上,从目标层、系统层、变量层、指标层四个层次建立了城市可持续发展评估的指标体系。     

徐庄子地震台地电阻率直流供电对地磁观测的干扰研究

探讨地电直流供电对GM4分钟值数据干扰的解决方案,及施工改造效果.结果表明,引入地埋铠装电缆布设外线,可以屏蔽直流供电产生的部分感应磁场,较好的解决台站场地条件的限制,提高GM4分钟值数据的观测质量.     

SEDIMENT PROPERTIES AND DYNAMICS IN THE TAIHU LAKE, CHINA

1 INTRODUCTION Large amounts of nutrients and contaminants such as trace metals are transported into large lakes frominflow rivers and then absorbed onto or associated with fine-grained sediment particles (Sheng and Lick,1979). The nutrients and contamina…     

矿井分布式地震超前探测系统研究与应用

为探测掘进巷道前方地质构造,研制一套矿井分布式地震超前探测系统。系统基于地震波反射理论,通过检波器分布式接收或震源分布式激发确定地质异常体的位置。为了进一步提高煤矿采掘过程中构造的预测预报精度,采用分布式观测系统和孔中胶囊检波器进行数据采集以提高设备的灵敏度,通过负视速度原理排除侧帮和后方地质异常体的干扰,利用绕射共偏移算法优化数据反演成果。经过大量试验验证和归纳总结,该系统采用人工锤击震源可有效探测出前方70 m范围内的地质异常信息,采用人工炸药激发震源可有效探测出前方150~200 m范围内的地质异常信息。研究结果表明,矿井分布式地震超前探测系统通过从硬件到软件优化,可实现采掘过程中对地质构造的探测精度,并提高探测效率。     

深厚覆盖层建坝土体利用研究

本文通过深厚覆盖层基坑开挖现场原位试验及室内试验论证了覆盖层沉积时代越早、埋深越大和在有上覆盖重情况下力学性能和抗渗性能均有明显提高,总结了国内外覆盖层建坝土体利用经验,提出了覆盖层土体利用原则,以达到充分利用坝基下覆盖层、节约工期及降低造价目的。同时本研究可推动深厚覆盖层建坝技术发展,可供水利水电工程技术人员借鉴。     

Combined adaptive multiple subtraction based on optimized event tracing and extended wiener filtering

The surface-related multiple elimination (SRME) method is based on feedback formulation and has become one of the most preferred multiple suppression methods used. However, some differences are apparent between the predicted multiples and those in the source seismic records, which may result in conventional adaptive multiple subtraction methods being barely able to effectively suppress multiples in actual production. This paper introduces a combined adaptive multiple attenuation method based on the optimized event tracing technique and extended Wiener filtering. The method firstly uses multiple records predicted by SRME to generate a multiple velocity spectrum, then separates the original record to an approximate primary record and an approximate multiple record by applying the optimized event tracing method and short-time window FK filtering method. After applying the extended Wiener filtering method, residual multiples in the approximate primary record can then be eliminated and the damaged primary can be restored from the approximate multiple record. This method combines the advantages of multiple elimination based on the optimized event tracing method and the extended Wiener filtering technique. It is an ideal method for suppressing typical hyperbolic and other types of multiples, with the advantage of minimizing damage of the primary. Synthetic and field data tests show that this method produces better multiple elimination results than the traditional multi-channel Wiener filter method and is more suitable for multiple elimination in complicated geological areas.