下扬子黄桥地区二叠系龙潭组储层特征及成岩演化模式     

张妮  林春明  俞昊 《江苏地质》2015,39(4):535-542

借助大量岩石薄片和铸体薄片鉴定以及扫描电镜观察等手段,对黄桥地区二叠系龙潭组进行储层特征分析,认为该区岩石成分成熟度较低,结构成熟度中等。该区储层的储集物性主要受沉积作用和成岩作用的共同影响。研究区储层碎屑岩的矿物粒度、分选性和磨圆度等因素直接导致了研究区储层的低孔渗值。成岩作用中的压实和胶结作用使储层原生孔隙迅速减少、渗透率降低,而溶蚀作用则是导致次生孔隙发育及改善砂岩储集性能的主要因素。黄桥地区龙潭组储集层主要处于中成岩B期阶段,决定了该区溶蚀型次生孔隙较为发育。结合成岩作用特征和研究区成岩演化模式,认为中成岩阶段A期晚期（白垩纪晚期）是研究区油气藏形成的最佳时期  相似文献   

吉林省东丰县治安堡铁矿地质特征及成因     

连倪  孙月  马铭  申家新  沈济篷  郭彦龙 《吉林地质》2015,(1):57-60

本文叙述了吉林省东丰县治安堡铁矿的区域地质特征、区域矿产、矿石质量、矿石类型、矿体特征和围岩。并对矿床的成因、及找矿标志进行了初步探讨。  相似文献   

A case history of field pumping tests in a deep gravel formation in the Taipei Basin,Taiwan     

James C. Ni  Wen-Chieh Cheng  Louis Ge 《Engineering Geology》2011,117(1-2):17-28

33 large-diameter wells embedded in 2-m thick, 63-m deep diaphragm walls were constructed to reduce both the uplift pressures and the groundwater inflow during the excavations. As the actual thickness of the pumped aquifer is unknown, the installed wells are regarded as partial penetration wells. Single-well and multi-well pumping tests were conducted in the deep gravel formation of Taipei Basin to derive the hydraulic parameters and to investigate the drawdown characteristics at both the construction and remote sites. However, the tidal effect on the drawdown of both the pumping well and nearby observation wells was found significant. Additionally, wellbore storage, skin, and leakage need to be taken into account for deriving the hydraulic parameters. Hence, a method to remove these five factors influencing the drawdown curve is developed, which takes advantage from the late-time characteristics of drawdown data and the early-time behavior of drawdown. Some currently available semi-log graphic techniques are therefore proven applicable for parameter determination. Validity of the proposed method is verified by the good agreement between the calculated and the measured drawdown of both the pumping well and observation well.  相似文献   

A Case Study on the Effect of Post-critical SmS on Ground Motion in Yingjiang,Yunnan Province,China     

Luo Yan  Ni Sidao  Chen Yong 《中国地震研究》2011,25(1):1-12

There are controversies on ground motion attenuation relations at the epicentral distance of about 100km. Some models predict that the seismic energy remains almost constant or becomes even stronger with increasing distance at this distance,while other models hold that it decreases with increased distance. The divergence lies mainly in whether SmS is stronger than direct S and surface waves at this distance. With the MS5. 9 earthquake sequence in the Yingjiang region of Yunnan Province as an example,we demonstrate that SmS is always 2 ～ 5 times stronger than direct S waves around the epicentral distance of 100km ( which is the post-critical distance for S in this region ). Study of synthetic seismograms suggest that crustal structure has an important effect on the amplitude of post-critical SmS, with simple crust producing strong SmS. This preliminary study confirms that in China,SmS also plays an important role on ground motion at distances around 100km,which demands more studies of post-critical SmS.  相似文献   

Preface to the special issue on earthquake geodesy     

Sidao Ni 《地震学报(英文版)》2011,(2):133-134

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石油地震纵横波速度层析成像     

吴发恩  唐棠  李凡异  高妮  陈立成 《CT理论与应用研究》2011,20(2):191-209

本文以分层均匀"多层介质模型"为依据,正演模拟多炮人工地面地震记录.其观测方式为:三炮位置分别在1500m,2500m,3500m处;道检距25m,140道(或道检距5m,700道),偏移距1000 m.为提高地震反射层析成像的精度,运用"走时最小纵横波速度层析成像"与"波形基本解纵横波速度层析成像"相结合的方法,反演...  相似文献   

冬季北极海冰与中国同期气温的关系   总被引：3，自引：0，他引：3  

高清清  孙照渤  倪东鸿 《气象与减灾研究》2011,(4):7-15

采用Hadley中心的海冰密集度资料和中国160站气温资料,对冬季北极海冰变化的主要模态进行了分析,定义了5个关键海区,重点讨论了冬季北极海冰异常与中国冬季气温的关系.结果表明,冬季北极海冰变化主要表现为第一模态,即太平洋、大西洋的海冰反位相分布.海冰变化的关键区域为区域Ⅰ巴伦支海、区域Ⅱ格陵兰海、区域Ⅲ戴维斯海峡、区...  相似文献   

利用多个震源机制解求东大别地区平均应力场   总被引：3，自引：0，他引：3       下载免费PDF全文

刘泽民  刘东旺  李玲利  倪红玉  陈安国  郑先进 《地震学报》2011,33(5):605-613

利用地震的震源机制解资料,得到应力张量在地理坐标系下的表达式,进而可计算平均应力张量.通过求平均应力张量的本征向量,即可得到其主轴方向,并由此推断区域应力场方向.利用东大别地区219次地震的震源机制解资料,比较了不同相似程度和不同起算震级资料得到的主轴方向,认为该方法计算结果非常稳定,主轴方位角的误差小于5°,倾角的误...  相似文献   

基于NDVI时序数据的水稻种植面积遥感监测分析——以江苏省为例   总被引：3，自引：0，他引：3  

苗翠翠  江南  彭世揆  吕恒  李扬  张瑜  王妮  李军 《地球信息科学学报》2011,13(2):273-280

MODIS植被指数时间序列产品能够连续反映植被的覆盖情况,是农作物遥感测量的重要数据源.本文选取江苏省为研究区,利用2008年23个时相的MODIS NDVI数据,采用S-G滤波法进行时间序列的重构,提高NDVI时间序列信息的真实性.另结合农作物物候历、种植结构、地面调查样本等辅助资料,将水稻植被指数时间序列曲线参量化...  相似文献   

南阳盆地地热地质特征研究   总被引：1，自引：0，他引：1  

韩国童  张富有  彭妮 《地下水》2011,(6):1-4

地热资源已成为现阶段重要的绿色能源之一,通过分析研究南阳盆地地热地质特征,为开发利用本区域的地热资源提供地质资料依据.南阳盆地位于秦岭纬向构造带与华夏类型构造反接复合部位,为三面环山向南开口的单断式中、新生代山间盆地,面积约1.7×104km2,地热类型属中低温(Ⅱ)类Ⅱ-1型层状热储类型,盖层为第四系、新近系上寺组、...  相似文献