靖边气田南部Mu_(1-4)储层控制因素研究     

顾绍富  吴燕  雷卞军  夏湘玲  孟堃  陈波 《新疆地质》2010,28(3)

通过对靖边气田南部MU1-4储层的沉积微相、成岩作用、构造特征及古地貌单元特征进行分析,认为潮上带的(含)膏模膏核泥-细粉晶白云岩和潮间带上部的膏模泥-细粉晶云岩为最有利微相.对孔隙起建设性成岩作用主要是准同生白云石化作用、表生岩溶作用和埋藏溶解作用,构造高部位的储渗能力较强,岩溶斜坡及台丘,尤其古沟槽附近,是岩溶储层发育的有利区域.要准确把握本区碳酸盐岩储集层的分布规律,需以沉积微相、成岩作用为基础,结合现今构造特征和岩溶古地貌,展开多因素组合分析.  相似文献   

遥感技术在大狐狸山地区1：50000矿产远景调查中的应用     

刘颖璠  苏世杰  郑宝军  梁伟  许立权  嘎日迪 《西北地质》2010,43(2):195-201

以内蒙古自治区西部阿拉善盟额济纳旗大狐狸山地区1：5万矿产远景调查为例,论述了遥感技术在1：5万矿产远景调查中的应用和具体工作方法。研究结果表明,在1：5万矿产远景调查中充分利用遥感技术,进行线性构造、环形构造、地质体的信息提取,利用主成分分析法有效提取矿化蚀变信息,在RGMAP数字平台,将工作区的标准影像图与其它数据源进行叠加整合,多轮回遥感地质解译成图,结合地质、物探、化探工作成果,快速有效地指导了地面找矿工作,对合理圈定找矿预测靶区起到了重要作用。  相似文献   

四川绿水洞井田煤层稳定性探采对比及其影响因素探讨     

阳伟  苏时才  陈长永  张峰  王俊 《中国煤炭地质》2010,(10):1-4,16

绿水洞井田可采煤层为龙潭组一段的K1煤层,通过煤层稳定性探采对比及其影响因素的探讨,认为地质勘查阶段在确定煤层稳定性时,应当剔除因褶皱、断层和陷落柱等因素引起煤厚突变的地质点。通过大量地质资料分析了影响矿区煤层稳定性的因素,认为褶皱在侧压力及垂直压力作用下分别导致褶皱核部煤层增厚和变薄;正断层和逆断层分别导致其附近煤层变薄和增厚;陷落柱多使其附近煤层变薄。勘查阶段煤层稳定性的合理确定为煤矿合理布置采掘巷道和选择合理的采煤方法都具有一定的实际意义。  相似文献   

10Be and 26Al exposure‐age dating of bedrock surfaces on the Aran ridge,Wales: evidence for a thick Welsh Ice Cap at the Last Glacial Maximum     

Neil F. Glasser  Philip D. Hughes  Cassandra Fenton  Christoph Schnabel  Henrik Rother 《第四纪科学杂志》2012,27(1):97-104

This paper presents results of the analysis of paired cosmogenic isotopes (¹⁰Be and ²⁶Al) from eight quartz‐rich samples collected from ice‐moulded bedrock on the Aran ridge, the highest land in the British Isles south of Snowdon. On the Aran ridge, comprising the summits of Aran Fawddwy (905 m a.s.l.) and Aran Benllyn (885 m a.s.l.), ²⁶Al and ¹⁰Be ages indicate complete ice coverage and glacial erosion at the global Last Glacial Maximum (LGM). Six samples from the summit ridge above 750–800 m a.s.l. yielded paired ¹⁰Be and ²⁶Al ages ranging from 17.2 to 34.4 ka, respectively. Four of these samples are very close in age (¹⁰Be ages of 17.5 ± 0.6, 17.5 ± 0.7, 19.7 ± 0.8 and 20.0 ± 0.7 ka) and are interpreted as representing the exposure age of the summit ridge. Two other summit samples are much older (¹⁰Be ages of 27.5 ± 1.0 and 33.9 ± 1.2 ka) and these results may indicate nuclide inheritance. The ²⁶Al/¹⁰Be ratios for all samples are indistinguishable within one‐sigma uncertainty from the production rate ratio line, indicating that there is no evidence for a complex exposure history. These results indicate that the last Welsh Ice Cap was thick enough to completely cover the Aran ridge and achieve glacial erosion at the LGM. However, between c. 20 and 17 ka ridge summits were exposed as nunataks at a time when glacial erosion at lower elevations (below 750–800 m a.s.l.) was achieved by large outlet glaciers in the valleys surrounding the mountains. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

The impact and rotational light curves of Comet 9P/Tempel 1     

Jean Manfroid  Damien Hutsemékers  Anita L. Cochran  William M. Jackson  Rita Schulz 《Icarus》2007,187(1):144-155

UVES and HIRES high-resolution spectra of Comet 9P/Tempel 1 are used to investigate the impact and rotational light curves of various species with a view toward building a simple model of the distribution and activity of the sources. The emission by OH, NH, CN, C₃, CH, C₂, NH₂, and OI, are analyzed, as well as the light scattered by the dust. It is found that a simple model reproduces fairly well the impact light curves of all species combining the production of the observed molecules and the expansion of the material throughout the slit. The impact light curves are consistent with velocities of 400-600 m/s. Their modeling requires a three-step dissociation sequence “Grand-Parent → Parent → Daughter” to produce the observed molecules. The rotational light curve for each species is explained in terms of a single model with three sources. The dust component can however not easily be explained that way.  相似文献   

基于ITRF2005的全球板块运动模型   总被引：1，自引：0，他引：1  

荣敏  周巍 《海洋测绘》2009,29(1):1-3

基于最新的国际地球参考架ITRF2005的速度场，构建了一个新的现时板块运动模型ITRF2005VEL，比以往用空间测量技术或地质、地球物理资料建立的板块运动模型更精确和更全面地反映现时全球板块运动的特点。求解了ITRF2005VEL的现时板块运动参数；然后与地学板块运动模型NNR—NUVELlA相比两者基本一致。表明：最近三百万年内全球板块运动总体上是稳定的。  相似文献   

探针药物法评价磺胺甲基异唑、甘草和连翘对牙鲆CYP2E1活性的影响     

韩现芹  李健  王群  刘淇  韩华  李吉涛  陈萍 《中国海洋大学学报(自然科学版)》2009,39(3)

采用探针药物法研究磺胺甲基异唑(SMZ)、甘草及连翘对牙鲆细胞色素P4502E1 (CYP2E1)活性的影响,为临床合理用药提供参考.将牙鲆随机分为4组,即对照组、SMZ组、甘草组和连翘组.依次每日口灌0.9%的生理盐水、口灌SMZ 150 mg/kg·bw、甘草30 mg/kg·bw和连翘100 mg/kg·bw.连续6 d后,第7天时4组牙鲆同时一次性腹腔注射探针药物氯唑沙宗,分别于注射给药后不同时间点采血.通过HPLC检测探针药物的血药浓度,计算药动学参数,间接评价各组对CYP2E1酶的活性影响.结果表明:氯唑沙宗在4组牙鲆体内代谢的药时曲线均符合二室模型.甘草组和连翘组氯唑沙宗的半衰期分别增加了0.311倍和0.799倍,均差异极显著(P<0.01);SMZ组与对照组差异不显著.药时曲线下面积SMZ组与对照组比较减少了0.277倍,甘草组增加了0.286倍,差异均显著(P<0.05);连翘组增加了0.865倍,差异极显著(P<0.01).总清除率(CL)SMZ组增加了38.83%,连翘组减少了46.88%,均差异极显著(P<0.01);甘草组减少了21.22%,差异显著(P<0.05).说明甘草,连翘对牙鲆CYP2E1的活性均具有明显的抑制作用,连翘的抑制作用高于甘草,SMZ对牙鲆CYP2E1的活性具有诱导作用,差异不显著.  相似文献   

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赵刚  李江  何案华  王军  秦久刚 《大地测量与地球动力学》2007,27(6):124-128

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X-ray Spectroscopy of Dips of Cir X-1     

Ya-Juan Lei Fang-Jun Lu Jin-Lu Qu Li-Ming Song Cheng-Min Zhang 《中国天文和天体物理学报》2007,7(5):693-704

We present X-ray spectral analyses of the low-mass X-ray binary Cir X-1 dur- ing X-ray dips,using the Rossi X-ray Timing Explorer(RXTE)data.Each dip was divided into several segments,and the spectrum of each segment was fitted with a three-component blackbody model,in which the first two components are affected by partial covering and the third one is unaffected.A Gaussian emission line is also included in the spectral model to represent the Fe Kαline at～6.4 keV.The fitted temperatures of the two partially covered components are about 2 keV and 1 keV,while the uncovered component has a temperature of～0.5-0.6 keV.The equivalent blackbody emission radius of the hottest component is the smallest and that of the coolest component is the largest.During the dips the fluxes of the two hot components are linearly correlated,while that of the third component does not show any significant variation.The Fe line flux remains constant,within the errors,during the short dips.However,during the long dips the line flux varies significantly and is positively correlated with the fluxes of the two hot components.These results suggest:(1)that the tem- perature of the X-ray emitting region decreases with radius,(2)that the Fe Kαline emitting region is close to the hot continuum emitting region,and(3)that the size of the Fe line emit- ting region is larger than that of the obscuring matter causing the short dips but smaller than the region of that causing the long dips.  相似文献   

The internal structure of Jupiter family cometary nuclei from Deep Impact observations: The “talps” or “layered pile” model     

Michael J.S. Belton  Peter Thomas  Peter Schultz  Lori Feaga  Olivier Groussin  Casey Lisse  Jessica Sunshine  W. Alan Delamere 《Icarus》2007,187(1):332-344

We consider the hypothesis that the layering observed on the surface of Comet 9P/Tempel 1 from the Deep Impact spacecraft and identified on other comet nuclei imaged by spacecraft (i.e., 19P/Borrelly and 81P/Wild 2) is ubiquitous on Jupiter family cometary nuclei and is an essential element of their internal structure. The observational characteristics of the layers on 9P/Tempel 1 are detailed and considered in the context of current theories of the accumulation and dynamical evolution of cometary nuclei. The works of Donn [Donn, B.D., 1990. Astron. Astrophys. 235, 441-446], Sirono and Greenberg [Sirono, S.-I., Greenberg, J.M., 2000. Icarus 145, 230-238] and the experiments of Wurm et al. [Wurm, G., Paraskov, G., Krauss, O., 2005. Icarus 178, 253-263] on the collision physics of porous aggregate bodies are used as basis for a conceptual model of the formation of layers. Our hypothesis is found to have implications for the place of origin of the JFCs and their subsequent dynamical history. Models of fragmentation and rubble pile building in the Kuiper belt in a period of collisional activity (e.g., [Kenyon, S.J., Luu, J.X., 1998. Astron. J. 115, 2136-2160; 1999a. Astron. J. 118, 1101-1119; 1999b. Astrophys. J. 526, 465-470; Farinella, P., Davis, D.R., Stern, S.A., 2000. In: Mannings, V., Boss, A.P., Russell, S.S. (Eds.), Protostars and Planets IV. Univ. of Arizona Press, Tucson, pp. 1255-1282; Durda, D.D., Stern, S.J., 2000. Icarus 145, 220-229]) following the formation of Neptune appear to be in conflict with the observed properties of the layers and irreconcilable with the hypothesis. Long-term residence in the scattered disk [Duncan, M.J., Levison, H.F., 1997. Science 276, 1670-1672; Duncan, M., Levison, H., Dones, L., 2004. In: Festou, M., Keller, H.U., Weaver, H.A. (Eds.), Comets II. Univ. of Arizona Press, Tucson, pp. 193-204] and/or a change in fragmentation outcome modeling may explain the long-term persistence of primordial layers. In any event, the existence of layers places constraints on the environment seen by the population of objects from which the Jupiter family comets originated. If correct, our hypothesis implies that the nuclei of Jupiter family comets are primordial remnants of the early agglomeration phase and that the physical structure of their interiors, except for the possible effects of compositional phase changes, is largely as it was when they were formed. We propose a new model for the interiors of Jupiter family cometary nuclei, called the talps or “layered pile” model, in which the interior consists of a core overlain by a pile of randomly stacked layers. We discuss how several cometary characteristics—layers, surface texture, indications of flow, compositional inhomogeneity, low bulk density low strength, propensity to split, etc., might be explained in terms of this model. Finally, we make some observational predictions and suggest goals for future space observations of these objects.  相似文献