排序方式: 共有21条查询结果,搜索用时 18 毫秒
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DP4井是中石化华北分公司在鄂尔多斯盆地大牛地气田布置的一口充气欠平衡水平井,该井目的层为盒1段,地层压系数较低,压力系数范围0.83—0.99(平均0.93),为了有效保护气层,DP4井水平段全过程采用了充气欠平衡钻井工艺技术。欠平衡钻井工艺采用充气钻井液技术,通过该工艺在DP4井的实施,在盒1气层保护上取得较大成功。主要介绍了充气欠平衡钻井液技术的技术工艺、实施过程和现场实施情况,并对充气欠平衡钻井液技术在该井实施效果进行了分析评价。 相似文献
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油藏精细地质模型网格粗化算法及其效果 总被引:1,自引:0,他引:1
在前人研究基础上, 根据DP(Dykstra-Parsons)系数能定量评价储层非均质性, 微网格块的渗透率值粗化后, 其等效渗透率的上、下限(Cmin、Cmax)能反映渗透率的各向异性的特点, 提出了一种运算速度快和相对有效的网格粗化算法。该算法能考虑到储层非均质性对不同方向渗透率值的影响, 且求解过程相对简单。应用该方法对鄂尔多斯盆地中部某油藏的陆相储层的精细地质模型进行了网格粗化计算, 然后在粗化后的模型上进行油藏数值模拟研究, 同时针对研究区地质背景和产出流体微可压缩的物性特征, 首次利用流线模拟器对精细地质模型进行了油藏数值模拟研究, 并以此结果为标准, 对该网格粗化算法时效性进行了系统评价。分析表明, 该算法具有较快的计算速度和较高的可靠性, 是解决储层非均质强、物性差的陆相成因油藏精细油藏数值模拟的一种行之有效的手段。 相似文献
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Yasufumi Iryu Yasunari Takahashi Kazuhiko Fujita Gilbert Camoin Guy Cabioch Hiroki Matsuda Tokiyuki Sato Kaoru Sugihara Jody M. Webster Hildegard Westphal 《Island Arc》2010,19(4):690-706
Material cored during the Integrated Ocean Drilling Program (IODP) Expedition 310 ‘Tahiti Sea Level’ revealed that the fossil reef systems around Tahiti are composed of two major stratigraphic sequences: (i) a last deglacial sequence; and (ii) an older Pleistocene sequence. The older Pleistocene carbonate sequence is composed of reef deposits associated with volcaniclastic sediments and was preserved in Hole 310‐M0005D drilled off Maraa. Within an approximately 70‐m‐thick older Pleistocene sequence (33.22–101.93 m below seafloor; 92.85–161.56 m below present sealevel) in this hole, 11 depositional units are defined by lithological changes, sedimentological features, and paleontological characteristics and are numbered sequentially from the top of the hole downward (Subunits P1–P11). Paleowater depths inferred from nongeniculate coralline algae, combined with those determined by using corals and larger foraminifers, suggest two major sealevel rises during the deposition of the older Pleistocene sequence. Of these, the second sealevel rise is associated with an intervening sealevel drop. It is likely that the second sealevel rise corresponds to that during Termination II (TII, the penultimate deglaciation, from Marine Isotope Stages 6 to 5e). Therefore, the intervening sealevel drop can be correlated with that known as the ‘sealevel reversal’ during TII. Because there are limited data on the Pleistocene reef systems in the tropical South Pacific Ocean, this study provides important information about Pleistocene sealevel history, the evolution of coral reef ecosystems, and the responses of coral reefs to Quaternary climate changes. 相似文献
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双线偏振雷达的主要任务之一是定量测量降水,反射率因子ZH、差反射率因子ZDR、差相移率常数KDP都可以用来反演降雨强度,而KDP的测量误差大小是影响反演降雨强度效果的关键。本文从理论公式出发,计算和分析了不同方位平均、距离平均、不同谱宽σV等因素对差传播相移ΦDP测量精度的影响。理论计算结果表明:ΦDP的测量误差随着样本对数M、距离平均区间的增大而减小,随σV的增大而增大(σV=1 m/s时例外),此外,还总结了3种由ΦDP计算KDP的方法,并对这3种方法的测量误差进行了比较,发现方法二的测量误差很大,方法一和方法三在一定的条件下都能使KDP测量精度达到0.1°/km。 相似文献
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对1991年7月12─15日磁暴在我国境内空间差异的分析 总被引:1,自引:0,他引:1
我国地磁台站对1991年7月12─15日磁暴所统计的K指数的差异较大。本文通过对全国分布的38个台站记录资料的统计分析。得出结论:我国境内台站统计的该磁暴的K指数的差异主要与DP型变化的空间差异有关,台站测量数据是正确的。 相似文献
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太阳静日变化Sq是地球变化磁场的基本组成部分,Sq的特征反映电离层的电性质和高层大气的潮汐特性.研究Sq的变化特性,能够加深对电离层\|热层耦合的认识.准确分离出Sq,为计算地磁指数(如Dst、Kp和AE等)以及空间天气的准确预报提供必要信息.本文利用地磁观测数据,重点分析了北半球Sq形态及其午前午后不对称现象、Sq日变幅的变化特征、不同纬度地区日变幅与太阳天顶角的相关性的差异.研究表明低纬电流系和高纬电流系是引起Sq形态变化的重要来源,也是各种不对称性的主要起因. 相似文献
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承载力是衡量资源能否支持经济良性发展的重要标志之一。文章结合国内海域承载力和旅游承载力的相关研究,从滨海旅游承载力和滨海旅游业发展潜力正反两个方面,利用层次分析法对辽宁省6个沿海城市滨海旅游业发展现状进行评价,并基于DP政策战略矩阵对辽宁省滨海旅游业发展方向等进行分析。结果表明:大连的海域承载力和发展潜力均高于辽宁省平均水平,处于稳定发展状态;锦州和葫芦岛的海域承载力和发展潜力均低于辽宁省平均水平;营口、盘锦和丹东的海域承载力在辽宁省平均水平之上但发展潜力低于辽宁省平均水平。分析表明,辽宁省滨海旅游业地区差异较为明显,旅游产品同质化明显,区域间合作开发较弱。应各自发挥旅游资源特色发掘地区历史文化内涵,明确自身旅游市场定位,加强区域间协同开发,实现辽宁省滨海旅游业协同健康发展。 相似文献
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Dirk Pandel France A. Cordova Robert E. Shirey Gavin Ramsay Mark Cropper Keith O. Mason Rudi Much Dave Kilkenny 《Monthly notices of the Royal Astronomical Society》2002,332(1):116-126
XMM-Newton was used to observe two eclipsing, magnetic cataclysmic variables, DP Leo and WW Hor, continuously for three orbital cycles each. Both systems were in an intermediate state of accretion. For WW Hor we also obtained optical light curves with the XMM-Newton Optical Monitor and from ground-based observations. Our analysis of the X-ray and optical light curves allows us to constrain physical and geometrical parameters of the accretion regions and derive orbital parameters and eclipse ephemerides of the systems. For WW Hor we directly measure horizontal and vertical temperature variations in the accretion column. From comparisons with previous observations we find that changes in the accretion spot longitude are correlated with the accretion rate. For DP Leo the shape of the hard X-ray light curve is not as expected for optically thin emission, showing the importance of optical depth effects in the post-shock region. We find that the spin period of the white dwarf is slightly shorter than the orbital period and that the orbital period is decreasing faster than expected for energy loss by gravitational radiation alone. 相似文献