Experimental Study on Temperature Response of Different Ranks of Coal to Liquid Nitrogen Soaking     

Liu  Shumin  Li  Xuelong  Wang  Dengke  Zhang  Dongming 《Natural Resources Research》2021,30(2):1467-1480

Natural Resources Research - Liquid nitrogen freeze–thaw has been used in oil, shale gas and coalbed methane exploitation as an efficient fracturing technology. This paper aimed to study the...  相似文献   

松辽盆地徐家围子断陷火山岩裂缝形成机理   总被引：1，自引：0，他引：1  

陈树民  姜传金  刘立  初丽兰  裴明波 《吉林大学学报(地球科学版)》2014,44(6):1816-1826

松辽盆地徐家围子断陷是位于松辽盆地北部深层的半地堑型晚侏罗世-早白垩世伸展断陷,火山岩发育。在已有研究成果的基础上,结合野外露头和岩心观测及镜下研究发现：本区火山岩构造裂缝和溶蚀裂缝都比较发育,具有明显的规律性,多数原生缝被后期的构造应力或溶蚀作用改造成次生缝。本区裂缝形成的控制因素较多,主要有应力、构造、岩性和岩相、溶蚀作用、风化淋滤、构造应力场演化等,其中构造应力场演化、岩性和岩相及风化溶蚀作用是控制裂缝形成的主要因素。构造裂缝以高角度的张扭性和张性缝为主,多为半充填和无充填,具有多期、多方向、组合复杂等特点,是晚侏罗世至新近纪各种地质作用相互叠加的结果。构造通过控制不同构造部位的局部应力场分布来控制裂缝发育程度,沿断裂带存在明显的应力集中,形成裂缝发育带,特别在正断层上升盘、断层端部、背斜轴部等应力集中部位容易形成构造裂缝。有效火山岩油气储层为各类原生孔隙与裂缝的有效组合。由于火山喷发多个旋回叠加,加之风化剥蚀及不整合面的存在,造成裂缝在纵向上发育具有旋回性,溶蚀裂缝主要在不整合面附近发育。在平面上,裂缝主要发育在断裂密集区、断裂交汇部位和背形或向形构造发育的地区。本区处于爆发相和溢流相火山岩的发育区,气孔和裂缝最发育,特别是溢流相的流纹岩中,裂缝和气孔均较为发育,是本区的优质储层最发育区,也是天然气富集区。  相似文献   

松辽盆地中央坳陷滨北地区上白垩统青山口组沉积相与沉积演化   总被引：5，自引：1，他引：4       下载免费PDF全文

赵波  尹淑敏  张顺  林春明  梁江平 《古地理学报》2009,11(3):293-300

通过岩心和测井资料分析,系统地研究了松辽盆地中央坳陷滨北地区上白垩统青山口组的沉积特征;采用单因素分析多因素综合作图法,编制出了研究区上白垩统青山口组各亚段的砂岩含量、暗色泥岩含量和紫红色泥岩含量等单因素图件,在此基础上做出沉积相图,深入分析了研究区沉积演化规律。研究表明,青山口组主要发育三角洲和湖泊2种沉积相,进一步分为三角洲平原、三角洲前缘、滨浅湖和半深湖-深湖4种沉积亚相。从研究区边缘到中心,沉积相类型由三角洲平原亚相渐变为三角洲前缘、滨浅湖和半深湖-深湖亚相;自下而上由半深湖-深湖亚相逐渐变为滨浅湖、三角洲前缘、三角洲平原亚相。青山口组沉积时期可划分为青山口组沉积早期、青山口组沉积中期和青山口组沉积晚期。不同时期、不同构造单元的沉积特征表现各异,从青山口组沉积早期到青山口组沉积晚期,研究区湖盆发育总体表现出规模由大到小的特点。  相似文献   

Impact of water resource exploitation on the hydrology and water storage in Baiyangdian Lake   总被引：4，自引：0，他引：4  

Juana Paul Moiwo  Yonghui Yang  Huilong Li  Shumin Han  Yanmin Yang 《水文研究》2010,24(21):3026-3039

Water resources development and exploitation are critical for a viable and sustainable modern human society. Unfortunately, however, there is a considerable water storage depletion and environmental degradation in especially (semi)‐arid river basins due to the forces of population growth, urbanization, industrialization and intensive agricultural irrigation. Addressing water storage depletion is not only a question of research, but is very much a question of developing appropriate countermeasures to preserve valuable/fragile ecological systems. As one such effort, this study analyzes the hydrology and storage in Baiyangdian Lake as affected by water resources development and exploitation in the Baiyangdian Lake Catchment of Northern China. Three models, WetSpass (Water and Energy Transfer between Soil, Plants and the Atmosphere under quasi‐Steady State), WATBUD (Water Budget) and MODFLOW (USGS three‐dimensional finite‐difference groundwater flow model) were used in combination to simulate the hydrogeologic conditions in the lake catchment for 1956–2008. The model‐calibrated values are in good agreement with the measured values, with R² > 0·8 and RMSE < 10% of measured values. Runoff, the primary source of water for the lake storage, has steadily declined due mainly to multiple dam construction and reservoir impoundments in the headwater valleys and rivers in the catchment. In addition to dwindling runoff, groundwater levels have declined considerably due to over‐abstraction, mainly for agricultural irrigation. Additionally, evaporation or evapotranspiration is increasing in the lake catchment due to rising temperatures. The worsening hydrological conditions, amid the harsh semi‐arid climate, have resulted in considerable depletion of the storage and hydrology of Baiyangdian Lake. Sustainable countermeasures like agricultural water‐saving and infusion of external water (e.g., via by the South–North Water Transfer Project) could be a viable option for preserving not only the hydrology of the lake catchment, but also storage in Baiyangdian Lake. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

In Situ FT-IR Observations on NaCl-H2O-D2O Fluids at Temperatures up to 850°C Using Hydrothermal Diamond Anivl Cell     

HU Shumin  ZHANG Ronghu  ZHANG Xuetong 《《地质学报》英文版》2013,87(Z1):242-244

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论岩溶地下水分水岭的类型及其实践意义     

邱书敏 《中国岩溶》1992,11(4):279-285

许多人习惯于把分水岭同水资源贫乏联系在一起。而岩溶区域内的地下水分水岭非但不一定贫水,有的还可成为重要的水源地。作者根据在广西工作的实践,将地下水分水岭划分为三种类型、七种型式,并简述了各种类型的特征及其水文地质意义   相似文献   

Spatio-temporal variations in the siphonophore community of the northern South China Sea   总被引：2，自引：0，他引：2  

李开枝  尹健强  黄良民  练树民  张建林 《中国海洋湖沼学报》2013,31(2):312-326

To understand how hydrological and biological factors affect near-to off-shore variations in the siphonophore community,we sampled zooplankton at 82 stations in the northern South China Sea during summer,winter,and spring.Forty-one species of siphonophore were collected by vertical trawling.The species richness of siphonophores increased from the nearshore to offshore regions in all three seasons of investigation,with maximum richness in summer and minimum richness in winter.The abundance of siphonophores was also higher in summer than in spring and winter,concentrated in the nearshore region in the warm season and scattered in the offshore region in the cold season.Four siphonophore groups were classified according to the frequency of occurrence:nearshore,near-offshore,offshore,and tropical pelagic.Among them,the nearshore group had higher abundance nearshore compared with the offshore.The tropical pelagic group had higher species number offshore than nearshore.Spatial and temporal fluctuations in taxonomic composition and abundance of siphonophores were due to the influence of the coastal upwelling and surface ocean currents of the South China Sea,driven by the East Asia monsoonal system.  相似文献   

A comparative study of sea surface wind datasets and their induced circulation characteristics in the North Pacific Ocean     

Wang  Dingqi  Fang  Guohong  Xu  Tengfei  Jiang  Shumin  Teng  Fei  Qiu  Ting  Wei  Zexun  Wang  Yonggang 《Ocean Dynamics》2023,73(2):59-77

Ocean Dynamics - Mainly driven by wind stress, the upper ocean dynamic processes in the North Pacific Ocean serve as important pathways for mass and energy exchanges of the global ocean and thus...  相似文献   

基于无人机观测的太原夏季PM_(2.5)垂直分布特征及成因分析          下载免费PDF全文

汪文雅  郭伟  王雁  陈玲  王淑敏  成鹏伟 《气象科学》2021,41(4):526-534

利用无人机搭载气象及环境监测设备于2020年7月29—31日在太原进行飞行试验,对不同高度层颗粒物和气象要素进行观测,得到PM_(2.5)三维分布及其随时间的变化特征,并通过气象要素、天气形势和后向轨迹分析得到污染累积和消散成因以及外地传输作用影响。结果表明:PM_(2.5)浓度的垂直分布差异显著,下午大部分时次满足"下高上低"规律,上午边界层垂直混合和颗粒物吸湿增长可能导致"下低上高"的情况;逆温层对大气垂直混合有明显抑制作用;29日为污染物积累过程,30日和31日白天均为消散过程;副热带高压带来的小风、高湿环境是29日颗粒物逐渐累积的原因,30日槽前对流发展和较大的风速有利于颗粒物浓度下降,31日相对湿度较低、对流发展旺盛使PM_(2.5)浓度快速下降;试验期间气流主要来自东南方向,太原市PM_(2.5)本地积累占主导地位,外地传输更多来自于本省晋中、长治等邻近城市。  相似文献