陕北斜坡东部李家岔探区高含水油藏成因分析          下载免费PDF全文

时保宏  赵靖舟孟祥振罗然昊 《中国地质》2007,34(3):445-449

本文通过101口井的试油和产量数据统计分析．总结了陕北斜坡东部李家岔探区油藏含水率的平面和纵向变化规律，并探讨了其高含水原因。研究区含水率有北部高、南部低，中间低、东西高的特征；含水率在纵向上有从下往上变低的趋势。通过烃源岩条件、物性条件及与相邻油田的对比分析，认为油源不足是李家岔探区油藏高含水的最主要原因，运移条件差是高含水的重要原因，低孔、低渗的储层条件也是高含水的原因之一。  相似文献   

三种降低土料含水量方法的试验研究     

张林洪  吴华金  王甦达 《岩土工程技术》2007,21(4):170-175

从原理分析,采用疏干排水、真空排水、电渗排水都能排除土料中的水分。为了确定能否在工程中使用,对三种方法进行试验。三种方法开始时排水速率较快,都能降低土体的含水量,提高土体密度。得出电渗方法排水效果最好。  相似文献   

含水率和添加剂对膨润土导热性能影响的研究     

朱国平  刘晓东  罗太安 《华东地质学院学报》2007,30(1):60-63

膨润土的热学性能是评价膨润土作为高放废物深地质处置库缓冲/回填材料的重要参数。高庙子膨润土矿床初步确定为我国缓冲/回填材料的供应基地,本研究以石英砂作为添加剂,通过实验获得了高庙子膨润土在不同含水率和不同砂含量时所对应的导热系数。结果表明,在相同压实条件下,导热系数随着含水率、石英砂含量的增加而增加。  相似文献   

如何应用探地雷达技术检测沥青公路的含水状况     

高宝屯 《物探化探计算技术》2007,(Z1)

根据平面电磁波在具有不同物理性质的介质分界面发生的反射规律,利用雷达实测信号的幅值信息,实现了公路层介电常数的自动计算。并根据物理模型实验结果,建立了沥青材料含水率与介电常数之间的数学关系模型。利用这二项技术可以实现应用探地雷达技术检测沥青公路的含水状况。  相似文献   

西安地区马兰黄土的结构强度研究   总被引：2，自引：0，他引：2  

何青峰  林斌  赵法锁 《水文地质工程地质》2007,34(5):21-24

对西安地区马兰黄土进行了单轴和常规三轴压缩试验,研究了含水量及围压对其结构强度的影响。结果表明,单轴条件下黄土结构强度随含水量增加呈线性减少,常规三轴条件下含水量和围压对其结构强度有着明显的影响。运用莫尔-库仑理论进一步研究了强度参数C、随含水量的变化规律,为西安地区地质灾害防治及工程设计提供依据。  相似文献   

粘土中电磁波速度与含水量关系研究及应用   总被引：2，自引：0，他引：2  

吴信民  曹俊昌  杨亚新  刘超英  张宝松 《水文地质工程地质》2007,34(5):120-122,127

本文通过室内不同含水量情况下粘土中电磁波速度的测试,研究了探地雷达电磁波在粘土中的传速播度,提出了粘土中电磁波速度随着含水量增加呈一阶负指数规律下降的理论模型,实际工作中,粘土中电磁波的传播速度可取80~200mm/ns。这一模型应用于某水库大坝探测漏水通道的工程实际中。开挖验证的结果表明:用探地雷达测量资料解释的该大坝漏水通道在平面上的投影位置与开挖结果相符合,漏水通道深度与实际开挖结果基本一致。  相似文献   

Monitoring the three-dimensional ionospheric electron density distribution using GPS observations over China   总被引：3，自引：0，他引：3  

Debao Wen  Yunbin Yuan  Jikun Ou 《Journal of Earth System Science》2007,116(3):235-244

In this paper, an IRI model assisted GPS-based Computerized Ionospheric Tomography (CIT) technique is developed to inverse the ionospheric electron density (IED) distribution over China. Essentially, an improved algebraic reconstruction technique (IART) is first proposed to reconstruct the ionospheric images with high resolution and high efficiency. A numerical experiment is used to validate the reliability of the method and its advantages to the classical algebraic reconstruction technique (ART). This is then used to reconstruct the IED images using the GPS data in China. The variations of the IED during magnetically quiet and disturbed days are reported and analyzed here. Reconstructed results during magnetically quiet days show some prominent ionospheric features such as the development of equatorial anomaly and the tilt of ionization crest. Meanwhile, ionospheric storm phase effects and disturbed features can also be revealed from the reconstructed IED image under storm conditions. Research shows that the positive storm phase effects usually happen in southern China, and the negative storm phase effects mainly occur in northern China. The equatorial anomaly crest moved to the north in the main phase of the storm. Ionosonde data recorded at Wuhan station provides the verification for the reliability of GPS-based CIT technique.  相似文献   

Medium-scale traveling ionospheric disturbances observed by GPS receiver network in Japan: a short review   总被引：2，自引：0，他引：2  

Takuya Tsugawa  Nobuki Kotake  Yuichi Otsuka  Akinori Saito 《GPS Solutions》2007,11(2):139-144

Medium-scale traveling ionospheric disturbances (MSTID) are wave-like perturbations of the ionospheric plasma with wavelengths of several hundred kilometres and velocities of several hundred metres per second. MSTID is one of the most common ionospheric phenomena that generally induce the perturbations of ionospheric total electron content (TEC) by ∼10¹⁶ electron/m², which corresponds to ∼54 ns (16.2 cm) delay at GPS L1 signal. In the past decade, several new characteristics on MSTIDs have been revealed by the TEC observations using the dense GPS receiver network in Japan. In this paper, we provide a short review of these new observations and summarize the morphological characteristics of MSTIDs in Japan.  相似文献   

Mapping the spatial variation of soil water content at the field scale with different ground penetrating radar techniques   总被引：2，自引：0，他引：2  

L. Weihermüller  J.A. Huisman  S. Lambot  M. Herbst  H. Vereecken 《Journal of Hydrology》2007,340(3-4):205-216

Two ground penetrating radar (GPR) techniques were used to estimate the shallow soil water content at the field scale. The first technique is based on the ground wave velocity measured with a bistatic impulse radar connected to 450 MHz ground-coupled antennas. The second technique is based on inverse modeling of an off-ground monostatic TEM horn antenna in the 0.8–1.6 GHz frequency range. Data were collected on a 8 by 9 m partially irrigated intensive research plot and along four 148.5 m transects. Time domain reflectometry, capacitance sensors, and volumetric soil samples were used as reference measurements. The aim of the study was to test the applicability of the ground wave method and the off-ground inverse modeling approach at the field scale for a soil with a silt loam texture. The results for the ground wave technique were difficult to interpret due to the strong attenuation of the GPR signal, which is related to the silt loam texture at the test site. The root mean square error of the ground wave technique was 0.076 m³ m⁻³ when compared to the TDR measurements and 0.102 m³ m⁻³ when compared with the volumetric soil samples. The off-ground monostatic GPR measured less within-field soil water content variability than the reference measurements, resulting in a root mean square error of 0.053 m³ m⁻³ when compared with the TDR measurements and an error of 0.051 m³ m⁻³ when compared with the volumetric soil samples. The variability between the two GPR measurements was even larger with a RSME of 0.115 m³ m⁻³. In summary, both GPR methods did not provide adequate spatial information on soil water content variation at the field scale. The main reason for the deviating results of the ground wave method was the poor data quality due to high silt and clay content at the test site. Additional reasons were shallow reflections and the dry upper soil layer that cannot be detected by the ground wave method. In the case of off-ground GPR, the high sensitivity to the dry surface layer is the most likely reason for the observed deviations. The off-ground GPR results might be improved by using a different antenna that allows data acquisition in a lower frequency range.  相似文献   

广东清远早、晚稻稻田甲烷排放的观测研究   总被引：1，自引：0，他引：1  

许黎  任万辉  杨宁  王天龙  刘锦銮  M A K Khalil  R A Rasmussen  M J Shearer 《气象》2007,33(3):19-27

分析了2003、2004年广东省清远市郊区早、晚稻稻田甲烷（CH4）的排放通量，结果表明：广东清远早、晚稻稻田CH4排放通量的几何平均值2003年为4，38mg·m^-2·h^-1和6．09mg·m^-2·h^-1；2004年为5．17mg·m^-2·h^-1和8．3mg·m^-2·h^-1，土壤有机质含量是造成2003和2004年CH4排放差异的原因之一。水稻品种的不同，CH4排放通量也有所不同，实验表明，水稻品种“七丝尖”的排放通量比品种“金优99”高1．08mg·m^-2·h^-1，产量却只有64％。此外，与相关的测量结果进行初步比较。  相似文献