秋冬低温寡照对吐鲁番设施农业的影响     

戴湘艳 《沙漠与绿洲气象(新疆气象)》2012,6(2)

利用吐鲁番地区两个测站1981～2010年30年晚秋～冬季（11～2月）的逐日平均气温、日最低气温、日照时数以及连续阴雪天数等资料,分析当地秋冬季节的低温、强降温、寡照的气候特征及其近30年的变化,归纳了吐鲁番地区影响温室大棚蔬菜生长的温度、光照指标,并提出了当地日光温室应对低温寡照的气象服务要点。  相似文献   

吐鲁番坳陷二叠系烃源岩有机质沉积特征   总被引：3，自引：1，他引：2  

苗建宇  周立发  邓昆 《地质科学》2005,40(2):198-206

二叠系烃源岩是我国西部吐鲁番坳陷中重要的潜在生烃层系。以地表剖面暗色泥岩的分析资料为主,结合部分井下烃源岩样品分析数据,探讨了吐鲁番坳陷二叠系烃源岩沉积时水体的Eh值、pH值及沉积特征。利用烃源岩分布、有机碳含量及有机质显微组份的赋存状态等特征对烃源岩的有机质沉积特征进行了研究。通过对烃源岩有机质分布的影响因素分析,发现烃源岩有机质的赋存大体上有3种不同的状态:顺层富集型、局部富集型及分散型。泥质碳酸盐岩类和泥岩类烃源岩主要沉积在半深湖--深湖相带,沉积物中有机碳含量高;灰色、深灰色泥岩及黑灰色碳酸盐岩主要沉积在浅湖相带,有机碳含量偏低;绿灰色、灰色泥岩主要沉积在河流--三角洲平原相带,沉积物中有机碳含量低。烃源岩沉积时具还原程度强的沉积相带是原始有机质沉积的良好场所,沉积有机质能及时沉积并保存,烃源岩大多有机质丰度高,有机质类型好;反之,则明显变差。  相似文献   

吐哈盆地鄯善弧形构造带碎屑岩的成岩作用     

刘林玉  陈刚  黄金山  魏国彪  周宝申  侯翠芳 《沉积与特提斯地质》1999,19(2):88

吐哈盆地鄯善弧形构造带三间房组储集层的成岩作用类型主要为压实作用、胶结作用和溶蚀作用。成岩作用改变了砂岩储集层的孔隙结构。压实作用和胶结作用降低了砂岩的原生孔隙度,溶解作用产生的次生孔隙成为主要的汕气储集空间。  相似文献   

Geochemical characteristics of saturate hydrocarbons in crude oils and source rocks of the Qaidam, Tarim, Tupran basins, NW China     

PAUL Philp 《中国地球化学学报》2012,31(3):264-275

Based on the systematic analyses of fifteen typical crude oils and ten typical potential source rocks col-lected from the Qaidam,Tarim and Turpan basins,Northwest China,the geochemical characteristics of the oils and source rocks were investigated and oil-source rock correlations undertaken.The oils and source rocks deposited in saline lacustrine environment from the western Qaidam Basin were characterized by n-alkanes with even car-bon-number preference in the C20-C28 range,low pristane/phytane(Pr/Ph) ratios(less than 0.5),and high abundances of C27 steranes,gammacerane and C35 hopanes.The oils and source rocks deposited in marine environment from the Tarim Basin were characterized by n-alkanes with even carbon-number preference in the C14-C18 range,relatively low Pr/Ph ratios(near to 1),high abundance of C28 steranes,and relatively high gammacerane.In contrast,the oils and source rocks deposited in terrigenous bog environment from the Turpan Basin were characterized by relatively high Pr/Ph ratios(oil samples greater than 6) high abundance of C29 steranes,and relatively low gammacerane and C31-35 hopanes.The higher amounts of C37 and C38 n-alkanes of source rocks from the western Qaidam Basin and the Tarim Basin suggest an origin of these alkanes from functionalized C37 and C38 n-alkadienes and alkenones in prymnesiophytes living in lacustrine and marine environments.Oil-source rock correlations suggest oils in the west-ern Qaidam Basin were derived from the Oligocene Lower Ganchaigou Formation(E3),oils in the Tabei and Tazhong uplifts from the Tarim Basin have a genetic relationship with the Middle-Upper Ordovician source beds.Oils in the Turpan Basin generally fall into two genetic types.Most oils in the Taibei depression from the Turpan Basin were derived from the Lower-Middle Jurassic coal measures,but the fewer oils in this region are a mixed source derived from the Lower-Middle Jurassic coal measure and the Upper Permian source rocks.  相似文献   

基于遥感生态指数的吐哈地区生态环境变化研究          下载免费PDF全文

王瑾杰  丁建丽  张子鹏 《干旱区地理》2022,45(5):1591-1603

以吐鲁番市和哈密市（简称吐哈地区）为研究对象,基于MODIS多光谱传感器2000、2006、2012年和2018年的遥感数据,采用4个表征湿度、干度、热度和绿度的指数,建立和绘制吐哈地区多个时期的遥感生态指数（Remote sensing ecology index,RSEI）,并对该地区的生态环境质量及土地利用转换情况进行了定量分析。结果表明：近20 a来,吐哈地区的绿度指数平均增加0.0244,热度指数平均降低0.0241,而湿度和干度指数整体的变化接近于0;其中,热度指数与RSEI具有负相关性。总体而言,2000—2018年吐哈地区的生态环境质量表现为略微下降的趋势;其中,吐鲁番市的鄯善县RSEI变化幅度最大,环境质量表征数据在区域下降幅度中排列首位,哈密市的巴里坤哈萨克自治县环境质量减少的幅度最小。近20 a来,吐哈地区的草地面积有明显增加,但需控制草地开垦及过度放牧,防止区域生态环境恶化。  相似文献   

Discovery of Mass Independent Oxygen Isotopic Compositions in Superscale Nitrate Mineral Deposits from Turpan‐Hami Basin,Xinjiang, China and Its Significance   总被引：1，自引：0，他引：1  

Li Yanhe  Qin Yan  LIU Feng  HOU Kejun  WAN Defang 《《地质学报》英文版》2010,84(6):1514-1519

<正>The Turpan-Hami Basin in eastern Xinjiang is one of the driest regions on Earth and a premier environment to form and preserve nitrate.A large nitrate ore field in this basin was found recently.It is estimated there are about 2.5 billion tons of resources of nitrate,and the amount is as much as the Atacama Desert super-scale nitrate deposit in Chile.Nitrate is one of a few minerals with mass-independent fractionation(MIF),and the oxygen isotope MIF is an effective method to determine the source of nitrate.Theδ~(17)O,δ~(18)O of nitrate were measured by fluorination and thermal decomposition method.The date indicated that this is the first time that oxygen isotope MIF has been located in inland nitrate minerals.The results obtained by two methods are similar,⊿~(17)=δ~(17)O-0.52×δ~(18)O=12‰-17‰.The experiment and observation data proved that oxygen isotope MIF of nitrate are the result of photochemical reactions in the troposphere and stratosphere.Thus, evidence from MIF oxygen isotopic compositions indicate that long term atmospheric deposition of nitrate aerosol particles produced by photochemical reactions is the source of the deposits.  相似文献   

The first dinosaur tracksite from Xinjiang, NW China (Middle Jurassic Sanjianfang Formation, Turpan Basin)——a preliminary report     

Oliver WINGS  Rico SCHELLHORN  Heinrich MALLISON  Ben THUY  Wenhao WU  Ge SUN 《世界地质(英文版)》2007,10(2)

A new dinosaur tracksite was discovered in a steeply inclined sandstone layer of the Middle Jurassic Sanjianfang Formation in the Shanshan area of the Turpan Basin. The site is the first record of dinosaur footprints from Xinjiang Province in northwestern China. More than 150 tridactyl theropod dinosaur footprints are preserved as positive hyporeliefs on the lower bedding plane of a fine-grained sandstone body. Most of the footprints are isolated and appear to be randomly distributed. Some show well defined phalangeal pads, heels and rarely indistinct impressions of the distal part of the metatarsus. Two distinct morphotypes are present: a larger type with relatively broad pads shows similarities to Changpeipus and Megalosauripus, and a slightly smaller, slender and gracile type which is similar to Grallator, Eubrontes and Anchisauripus. In both morphotypes, digit III is the longest with a length between 11.4 and 33.6 cm. A single imprint shows prominent scratches, probably formed during slipping of the track maker.  相似文献   

吐鲁番－哈密盆地的两种粗碎屑三角洲   总被引：16，自引：1，他引：16  

李文厚  林晋炎  袁明生  王武和 《沉积学报》1996,(3)

吐鲁番－哈密盆地上二叠统、三叠系和侏罗系广泛发育冲积扇、河流、湖泊、扇三角洲、辫状河三角洲和正常三角洲相沉积。其内扇三角洲和辫状河三角洲最为发育，二者在岩石类型、沉积结构、沉积构造、沉积韵律、沉积旋回、沉积背景及岩电组合上有很大的相似性，其骨架主要为河道砂体。这两种粗碎屑三角洲可用其特征的陆上沉积组合来区分。本区的扇三角洲和辫状河三角洲具有良好的储集油气潜能，是今后油气勘探不可忽视的相带。  相似文献   

Hydrocarbon genesis of Jurassic coal measures in the Turpan Basin, China     

Huang Difan  Zhang Dajiang  Li Jinchao  Huang Xiaoming 《Organic Geochemistry》1991,17(6)

A typical case of coal-derived oils in China, i.e. the crude oils from the Middle-Lower Jurassic coal measure strata in the Turpan Basin, is presented. By means of oil-source correlation, it is confirmed that low maturity crude oil in the Shengjinkou oil field is derived from the coal-bearing Qiketai Formation of Middle Jurassic age, a brackish lacustrine sediment. Mature crude oils in the Qiketai oil field, and in well Taican 1, are sourced from the Badaowan Formation of Lower Jurassic age, which contains coal seams as thick as 100 m. Results show that commercial accumulations of liquid crude oils can be generated from coals and coal measure strata containing high volatile coal of bituminous rank. Despite unfavourable types of source material, the total hydrocarbon-generating potential can be great due to the unusual abundance of organic matter.  相似文献   

吐鲁番-哈密盆地中新生代构造变形的数值模拟分析   总被引：1，自引：0，他引：1       下载免费PDF全文

梁海华  丁中一 《地震地质》1997,19(4):83-378

根据地质、地震剖面、重力等资料及野外实地考察结果，分析了新疆吐哈盆地内各块体的力学性质和运动方式，在此基础上提出了吐哈盆地的发育模式。根据地质模型，并充分考虑了地质时间因素，建立了包括大区域平面模型、南北向剖面模型和台北凹陷三维模型等计算模型，用有限元数值计算方法模拟了古构造应力场和构造变形场。结果表明：吐哈盆地自侏罗纪以来一直受到近南北向的挤压，但盆地各段边界上的作用方向略有变化。模拟结果还显示出盆地的不对称形态以及主应力方向随深度的变化  相似文献