山东桩海地区中生界碎屑岩储层特征及其控制因素   总被引：2，自引：1，他引：1  

帅萍 《高校地质学报》2009,15(3):398

采用岩芯观察、薄片鉴定、扫描电镜分析及X-衍射分析等手段,对桩海地区中生界碎屑岩储层的成岩作用、储集空间和控制因素进行了研究。结果表明,桩海地区中生界碎屑岩储层经历了强烈的压实压溶作用和胶结交代作用、多期次的溶解作用和裂缝形成作用;成岩作用阶段可划分为早成岩B,中成岩A1,A2 和中成岩B期。储集空间以溶解孔隙和裂缝为主,裂缝主要有构造裂缝、压实裂缝和解理裂缝;溶解孔隙主要有长石溶解孔隙和碳酸盐胶结物溶解孔隙,其成因主要与大气降水溶解作用和沙河街组、东营组有机质演化过程中形成的有机酸溶解作用有关。桩海地区中生界碎屑岩储层的控制因素主要有沉积作用、成岩作用和构造作用。沉积作用控制了碎屑岩杂基、分选、磨圆等结构特征,进而控制了原生孔隙结构,为后期溶解作用的形成奠定了基础。断层和不整合面作为流体运移通道为溶解作用提供酸性介质,断层和不整合的规模越大对碎屑岩储层物性的控制作用越明显,距离断层和不整合面越近的储层物性越好。溶解作用受沉积作用和构造作用的控制,在原始孔隙结构好、压实作用和早期胶结作用弱以及裂缝发育的地区,溶解作用强烈、次生孔隙发育、储层物性好。在沉积作用、成岩作用和构造作用的综合控制下,中生界顶底及内部不整合面附近发育多个次生孔隙发育带,中生界顶部处于中成岩A1 亚期的储层次生孔隙最发育。  相似文献   

An integrated lake-catchment approach for determining sediment source changes at Aqualate Mere,Central England     

Nathan J. Pittam  Ian D. L. Foster  Tim M. Mighall 《Journal of Paleolimnology》2009,42(2):215-232

This paper raises fundamental questions about the sole use of paleolimnological techniques to identify sediment sources and develop catchment management plans. The concept of an integrated lake: catchment framework was established 30 years ago, yet paleolimnologists occasionally fail to appreciate the dynamics of the contributing catchment. This is especially critical when the predominant source of sediment accumulating in a lake is allochthonous. In this paper we argue that a detailed appraisal of catchment sources and investigation of historical documentary evidence is needed to identify and evaluate the relative significance of sediment sources. We used such an approach at Aqualate Mere, Shropshire, UK. Mineral magnetic and radionculide signatures of potential catchment sources and accumulating lake sediments were compared in an attempt to match the sources to sediments deposited in the Mere. Dated lake sediments indicate there has been an increase in sedimentation rate and the relative amount of minerogenic material delivered to the Mere over the last 200 years. In contrast to a previous study at the same site, there is no evidence to attribute this increase to an overspill from a nearby canal. Other catchment disturbances include landscaping in parkland surrounding the Mere in the early nineteenth century and drainage systems installed to improve catchment agriculture over the last ca. 150 years. Both activities may explain the change in sedimentation rates and types, independent of the hypothesized canal origin. Although our results exclude the canal as a major sediment source, identifying the contribution of other potential catchment sources remains problematic. ¹³⁷Cs inventories for the lake are similar to those recorded at a local reference site, suggesting little influx of ¹³⁷Cs-bearing topsoil, yet ¹³⁷Cs activities remain high in the upper 20–30 cm of the lake sediment profile, indicating a topsoil origin. Combined radionuclide and mineral magnetic signatures proved to be relatively poor discriminators of potential sources, and the high atmospheric pollution load from the West Midland conurbation has probably altered recent lake sediment signatures. Although further research is required to identify the origins of recent (last ca. 200 years) minerogenic sediment inputs to the Mere, we suggest that the combined lake: catchment approach offers a more rigorous method for understanding the impact of catchment disturbance than analysis of the paleolimnological record alone.  相似文献   

西部中国沙棘叶片稳定碳同位素组成的空间特征及其气候意义   总被引：5，自引：3，他引：2  

刘光琇  张威  陈桂琛  章高森  李田  安黎哲 《中国沙漠》2009,29(5):866-871

分析了西部中国沙棘（Hippophate rhamnoides sinensis）叶片稳定碳同位素组成特征及其与环境因子之间的关系。结果表明,中国沙棘叶片δ13C值在-30.40‰~-24.91‰之间变化,平均值约为-27.62‰,属于C3植物。随纬度和经度的升高,中国沙棘叶片δ13C值明显升高,而随海拔的升高而降低,具有明显的空间分布特征。中国沙棘叶片δ13C值与温度没有明显的关系,随蒸发量和日照时间的升高而升高,随降水量的升高有降低趋势,具有明显的气候意义。表明中国沙棘具有较高的水分利用效率,水分是控制中国沙棘δ13C值变化或生长的主导因子。  相似文献   

影响南极海洋石油烃低温降解菌希瓦氏菌NJ49生长和降解率的环境因素研究   总被引：1，自引：0，他引：1       下载免费PDF全文

刘芳明  缪锦来  臧家业  董春霞  王以斌 《极地研究》2009,21(2):81-90

以柴油为唯一碳源和能源,从南极海水海冰微生物资源库中筛选到一株石油烃低温降解菌希瓦氏菌NJ49,并对影响其生长和降解率的环境因素(pH、温度、盐度、营养盐和表面活性剂)进行了初步研究。结果表明:希瓦氏菌NJ49可作为低温海域石油烃污染生物修复的菌源,其生长和降解的最适条件为:初始pH7.5,温度15℃,盐度6%,摇瓶装量80ml,最佳氮源硝酸铵,最佳磷源为磷酸二氢钾和磷酸氢二钾的混合物,添加表面活性剂可促进希瓦氏菌NJ49的生长和生物降解率。  相似文献   

水库诱发地震活动特征及其预测方法研究   总被引：7，自引：0，他引：7  

秦嘉政  刘丽芳  钱晓东 《地震研究》2009,32(2)

根据国内外水库诱发地震的观测与研究震例,分析研究了一些著名水库诱发序列的地震活动特征,并根据水库诱发地震随水库蓄水时间的变化,把水库诱发地震活动归纳为迅速响应型、延迟响应型和混合响应型三类,分析讨论了这三类水库诱发地震活动在时间和空间分布上的不同特点,并在此基础上综合分析了水库诱发地震预测方法研究的技术途径.  相似文献   

Ionospheric electromagnetic perturbations observed on DEMETER satellite before Chile M7.9 earthquake   总被引：1，自引：0，他引：1  

Xuemin Zhang Jiadong Qian Xinyan Ouyang Xuhui Shen Jin’an Cai  Shufan Zhao Institute of Earthquake Science  China Earthquake Administration  Beijing  China 《地震学报(英文版)》2009,(3):251-255

Based on the ionospheric electromagnetic data observed on DEMETER satellite of France, the ionospheric electromagnetic signals were analyzed within 10 days before Chile M7.9 earthquake on November 14, 2007. It is found that, low frequency electromagnetic disturbances began to increase in a large scale of latitude, and reached to a maximum one week prior to the earthquake, and at about three days before the quake, the peak values shifted to lower latitude. Taking three days as a group, spatial images of a fe...  相似文献   

超松弛迭代法反演震源破裂过程解的稳定性分析     

翟璐媛  杨陈  杨雅琼 《华北地震科学》2009,27(4):6-10,21

主要讨论超松弛迭代法反演震源破裂过程解的稳定性。在精确反演的基础上,分别对数据扰动和模型扰动进行分析,用MATLAB作图进行对比并得出最后的结论：超松弛迭代法反演震源破裂过程的结果是可靠的。  相似文献   

Modern pollen rain in the Lake Qinghai basin,China     

SHANG Xue    LI XiaoQiang  AN ZhiSheng  JI Ming  & ZHANG HongBin  State Key Lab of Loess & Quaternary Geology  Institute of Earth Environment  Chinese Academy of Sciences  Xi’an  China  Graduate University of Chinese Academy of Sciences  Beijing 《中国科学D辑(英文版)》2009,52(10):1510-1519

Lake Qinghai is the largest inland brackish lake in China and lies within the NE Tibetan Plateau. Our study shows that pollen assemblages in each vegetation belt are significantly correlated with the vegetation types of this area. Among the herbaceous and shrubby pollen assemblages, Artemisia is over-represented, while Poaceae, Cyperaceae and Polygonaceae are under-represented. Artemisia/ Chenopodiaceae (A/C) ratios with the regional vegetation characteristic can be used as a proper index to reconstruct the...  相似文献   

新城子地电阻率干扰因素分析研究     

郭晓燕  辛月提  乔艳芬  吴镝  尹德录 《东北地震研究》2009,25(4):38-41

本文首先概述了新城子地电阻率的观测环境,并根据新城子台近年几次地电阻率的异常变化,通过理论分析和观测环境实际凋杏,发现了铁栅栏、大气降水、观测室改造等干扰因素,分析了各种干扰曲线形态,为今后地电阻率干扰识别和排除提供参考。  相似文献   

2009年3月19日M_w7.6级汤加大地震的“震前扰动”现象          下载免费PDF全文

胡小刚  郝晓光 《地球物理学进展》2009,24(3):866-870

汶川大地震爆发后,作者在武汉大地测量国家野外科学观测站的重力仪资料中发现了震前约48小时的“重力扰动”现象、并在随后对全国数十个台站宽带地震仪资料的分析中得到了证实.2009年3月19日,太平洋岛国汤加海域爆发了M_w7.6级（里氏7.9级）大地震,宽带地震仪资料中再次出现了显著的、信号周期为4~8秒的“震前扰动”现象：从大地震前约16天的3月4日开始一直持续到地震发生.  相似文献