鲁西南地区煤成气盖层类型及分布     

宋绍伟  范存祥  张树淇  王少华 《中国煤炭地质》2010,(6):21-24

运用石油地质学与煤成气地质学等研究方法,分析了鲁西南地区煤成气盖层类型及其分布特征。研究表明,鲁西南地区除发育较好的煤成气烃源岩、储集层外,盖层保存也较完整,具备了该地区良好的煤成气成藏条件。在各凹陷区内,石炭—二叠系保存完整,其煤层上覆的泥质岩分布广泛,且多含有机质,厚度100～400m,其中包括一套对煤成气封闭能力最佳的杂色铝土质泥岩层(俗称"B层铝土"),厚10～30m;古近系也发育了多套以泥质岩为主的沉积,泥质岩总厚度达1000m以上,这些泥质岩大多为暗色,富集有机质。这些形成于不同时期的煤系地层上覆泥岩层共同构成了本区较好的区域性盖层。尤其在成武凹陷、鱼台凹陷和大汶口凹陷发育的古近系化学蒸发岩类——石膏、岩盐,是该地区煤成气最重要的区域盖层。  相似文献   

Heavy-metal accumulation trends in Yixing,China: an area of rapid economic development   总被引：1，自引：1，他引：0  

Shaohua Wu  Shenglu Zhou  Xingong Li  William C. Johnson  Hongfu Zhang  Jiangfeng Shi 《Environmental Earth Sciences》2010,61(1):79-86

Geochemistry of soils encapsulated by urban development and dendrochemistry were evaluated to reconstruct heavy-metal accumulation trends in an area of rapid economic development in China. The urban-covered soil spans a time period of 56 years from 1950 to 2006, and the tree cores cover the period from 1977 to 2006. Results from the six heavy-metal elements (Cd, Cr, Cu, Ni, Pb, and Zn) analyzed in this study indicate that heavy-metal concentrations increase significantly in urban-covered soils dating from 1980, which is corroborated by data from corresponding tree cores. The accumulation rates of Cd, Cr, Cu, Ni, Pb and Zn (1980–2006) were estimated at 0.91, 0.84, 1.42, 1.39, 1.34 and 1.86% per year, respectively. These high rates of accumulation suggest that anthropogenic sources resulting from rapid economic development led to the magnitude and rates of heavy-metal accumulation. Although reconstruction of heavy-metal accumulation trends using the urban-covered soils (substitutes space for time) introduces some uncertainty when compared with long-term experiments, this study demonstrates that urban-covered soils can provide a vehicle by which historical rates of heavy-metal accumulation can be approximated.  相似文献   

东营市国土资源局东营分局整治规范农村宅基地     

商少华  王可文 《山东国土资源》2009,25(12):61-62

2008年以来,东营区国土资源分局党组在认真分析当前农村政策和土地管理形式的基础上,将村庄整理复垦、“空心村”整治和宅基地管理列入工作重心,及时组织了全区农村“空心村”调查和宅基地管理的调研,建立健全了农村宅基地管理目标机制,并将其作为镇、街道综合考核的重要内容。  相似文献   

Distinctive MJO Activity during the Boreal Winter of the 2015/16 Super El Nino in Comparison with Other Super El Nino Events     

Xuben LEI  Wenjun ZHANG  Pang-Chi HSU  Chao LIU 《大气科学进展》2021,38(4):555-568

Many previous studies have demonstrated that the boreal winters of super El Nino events are usually accompanied by severely suppressed Madden-Julian oscillation(MJO) activity over the western Pacific due to strong descending motion associated with a weakened Walker Circulation. However, the boreal winter of the 2015/16 super El Nino event is concurrent with enhanced MJO activity over the western Pacific despite its sea surface temperature anomaly(SSTA)magnitude over the Nino 3.4 region being comparable to the SSTA magnitudes of the two former super El Nino events(i.e.,1982/83 and 1997/98). This study suggests that the MJO enhanced over western Pacific during the 2015/16 super El Nino event is mainly related to its distinctive SSTA structure and associated background thermodynamic conditions. In comparison with the previous super El Nino events, the warming SSTA center of the 2015/16 super El Nino is located further westward, and a strong cold SSTA is not detected in the western Pacific. Accordingly, the low-level moisture and air temperature(as well as the moist static energy, MSE) tend to increase in the central-western Pacific. In contrast, the low-level moisture and MSE show negative anomalies over the western Pacific during the previous super El Nino events.As the MJO-related horizontal wind anomalies contribute to the further westward warm SST-induced positive moisture and MSE anomalies over the western tropical Pacific in the boreal winter of 2015/16, stronger moisture convergence and MSE advection are generated over the western Pacific and lead to the enhancement of MJO convection.  相似文献   

深弹自导过程的波束相关处理仿真          下载免费PDF全文

邱涛  陈韶华 《数字海洋与水下攻防》2021,4(2):128-132

深弹精确自导受测向测距精度影响,为探究自导全过程算法,采用波束域相关处理方法,开展深弹自导过程中自导算法的测向测距性能研究.首先,对方法的可行性进行分析,确定噪声背景下有效混响抑制方法.进而,假设深弹运动态势和弹目的初始位置,根据几何态势推算出运动过程中的弹目位置和目标俯仰角,并加入随机误差模拟弹体旋转.最后,仿真计算...  相似文献   

甘肃塌陷地震震相识别研究          下载免费PDF全文

尹欣欣  蔡润  陈文凯  彭立顺  李少华 《地震工程学报》2021,43(2):259-263

选取甘肃省测震台网测定的甘肃平凉地区塌陷地震、甘东南地区天然地震各50个,同地区的30个地震事件为待测事件.采用近年来计算机领域里较先进的图像识别方法——卷积神经网络识别两种地震事件类型,设定波形通道总数的80％为地震事件分类阈值,超过分类阈值的设定为"0"或"1",即可判定该待测事件为对应的事件类型.将地震事件作为原...  相似文献   

基于甘肃气枪主动源的“地下云图”构建          下载免费PDF全文

张元生  秦满忠  钟美娇  邹锐  张卫东  周涛  郭晓  刘旭宙  李少华 《地震工程学报》2023,(2):382-386

在陆地气枪主动源技术系统不断发展的基础上，使用地震层析成像和计算机图像处理技术，把地震波物理参数(地震波速度和v_P/v_S)演化过程以气象云图的形式表现出来，达到“看图识天气”的目的。利用地震波速“地下云图”的结果开展地震孕育过程和机理研究，深入了解强震发生前后震源区地震波速度和波速比的时空演化表征，总结提取具有普适性的地震学前兆参数及其指标，对进一步提高地震预测预报效能有着重要科学意义。  相似文献