双重介质流线模拟技术在天然裂缝性油藏开发中的应用   总被引：1，自引：1，他引：0  

张学磊  胡永乐  张守良  樊茹  李保柱 《地质科技情报》2010,29(2)

为了更好地把握天然裂缝性油藏的开发动态,提升大型复杂油藏模型的运算速度,建立了以流线模拟技术为基础的双重介质模型,对天然裂缝性油藏的井型、注水速率、注水周期等影响采收率的因素进行研究,确定了油藏的最佳井型、最佳注水速率、最佳注水周期等指导油藏开发的关键参数,证实了流线模拟技术可以更直观地显示三维驱替前缘。在流线模拟技术与有限差分方法运算时间的比较中,也证实流线模拟技术具有更快的运算速度。  相似文献   

营口-辽滨经济区浅基础适宜性分区     

李录娟  张延军  王成  倪金 《世界地质》2010,29(1):139-143

营口-辽滨经济区有大面积的软土分布。通过对分布地区软土层的承载力计算和浅基础的规范法沉降量计算, 取55 mm作为地基附加沉降界线值, 并结合工程危险性指标将研究区划分为Ⅰ级- 工程适宜性良好区, Ⅱ级-工程适宜性一般区, Ⅲ级-工程适宜性较差区3级分区。其中Ⅰ级区主要分布在营口市区西部和盐区南部, Ⅱ区主要分布在营口市区西南部及辽滨乡地区、盐区除南部之外的地区, Ⅲ区主要在营口市区东部。Ⅰ、Ⅱ、Ⅲ类区分别占软土分区总面积的10.6%、86.2%、3.2%。  相似文献   

子午线收敛角对定向钻进精度的影响          下载免费PDF全文

向军文  刘志强 《探矿工程》2010,37(3):11-13

在定向钻进井眼轨迹计算时,以前方位计算只考虑磁偏角,而没有考虑子午线收敛角对定向控制精度的影响。在井距400m以上时,子午线收敛角最大误差可达10m以上,说明子午线收敛角对水平定向钻进精度影响较大。文中给出了通过井口的地理坐标简便计算子午线收敛角方法,其误差在20％以内,可满足对接连通井工程需要。并通过与美国产高精度磁中靶系统RMRS在土耳其29对对接连通井工程应用进行了验证,结果中靶误差较小。说明在定向钻进井眼轨迹计算时,考虑子午线收敛角对长距离水平定向井、定向对接连通井和非开挖工程精确设计和施工具有重要指导意义。  相似文献   

大位移井悬链线剖面设计的数值计算          下载免费PDF全文

鲁港  曹传文  夏泊洢 《探矿工程》2010,37(2):1-3,8

悬链线剖面是大位移井轨道的经典类型,在进行设计时需要求解一个以悬链线初始井斜角为未知数的非线性方程。由于未知数包含在多个三角函数和对数函数中,计算工作量较大,而且常用的迭代求解方法存在一些问题。通过数学变换将该方程转换成一个只包含对数函数和多项式函数的新方程,对新方程的函数性态做了几何分析,进而提出了寻找求解区间的步长搜索算法和自适应步长搜索算法。利用二分法在求解区间上能够快速求出新方程的数值解。利用大位移井设计实例验证了本文算法的有效性,并对圆弧井段井眼曲率与方程解的关系进行了讨论。本文提出的算法可用于大位移井轨道设计的计算机软件开发中。  相似文献   

火成岩储层物性特征及其影响因素——以松辽盆地南部英台断陷龙深1井区为例   总被引：1，自引：0，他引：1  

仲维维  卢双舫  张世广  黄文彪  邵明礼  王立武 《沉积学报》2010,28(3):563-571

利用大量储层实验资料,分析英台断陷龙深1井区的火成岩储层物性参数及非均质性的定量评价参数,研究结果表明:火成岩储层物性在空间上变化大,非均质性强。这使得对火成岩有效储层的预测变得困难,本次研究通过成像测井、室内岩石薄片鉴定及铸体薄片分析,探讨各种因素对火成岩储集空间的形成和改造的作用机理和过程,指出岩性是其它因素对火成岩储集物性产生影响的基础,火成岩亚相是物性的主要控制因素,成岩作用及构造作用是影响物性的重要因素,从而使得对火成岩有效储层的预测有章可循。  相似文献   

四川盆地广安地区上三叠统须家河组四段低孔渗砂岩成岩相类型划分及半定量评价   总被引：10，自引：0，他引：10  

张响响  邹才能  陶士振  徐春春  宋建荣  李国辉 《沉积学报》2010,28(1):50-57

成岩相是在一定沉积和成岩环境下经历了一定成岩演化阶段的产物,包括岩石颗粒、胶结物、组构和孔洞缝特征及其演化的综合面貌。成岩相的研究已成为低孔渗砂岩当前勘探阶段的研究重点。将广安地区须家河组四段划分为五种成岩相类型:粗中粒砂岩火山岩屑较强溶蚀低孔特低渗成岩相、火山岩屑弱溶蚀—强压实特低孔超低渗成岩相、中细粒砂岩压实致密相、中粗粒岩屑石英砂岩硅质胶结致密相以及方解石胶结致密相,并建立了不同类型成岩相的测井曲线特征。在单井成岩相分析基础上,通过编制成岩相的厚度百分含量等值线图、厚度等值线图、成岩相平面分布图等对成岩相进行了半定量化评价。  相似文献   

淮南煤田深部煤的孔隙特征及其意义     

梁红侠  陈萍  童柳华  陆春辉 《中国煤炭地质》2010,(6):5-8,30

从压汞试验入手,对淮南煤田煤的孔隙结构随埋藏深度的变化进行分析,根据大量实验数据得到以下认识:随采样深度的增大,煤中总比孔容积呈减小趋势,其中大孔的比孔容积在总比孔容积中所占比率逐渐减小,微孔的比孔容积在总比孔容积中所占比率显示增大趋势;随埋藏深度增加,煤的孔隙率有减小迹象,煤的真密度和视密度呈线性增加。煤内微孔的增多使煤吸附瓦斯的容量相对增多。深部煤与其顶板和底板岩石的力学性质的差异减小,使深部煤层厚度的稳定性增加。  相似文献   

Micromorphology of surface crusts in the Knersvlakte, South Africa     

Sarah-Jane C.Fox  Anthony J.Mills  Rosa M.Poch 《山地科学学报》2009,6(2):189-196

Soils in the Knersvlakte are particularly prone to crusting and have lower inherent infiltrability than other soils across western southern Africa. Micromorphological techniques were used to examine the structure and porosity of soil crusts in the Knersvlakte to ascertain why crusting is so intense in this region. Quantile regression using boundary lines was employed to examine the relationships between infiltrability and soil properties for all samples （n = 67）. This analysis showed that infiltrability is potentially maximal at low water- dispersible ＇clay plus silt＇ content and low silt content （r^2 = 0.72 and 0.64; respectively, n = 67） （Figure 2）. The strength of crusts, pH, EC, clay mineralogy, and water-dispersible clay, silt and ＇clay plus silt＇ content were compared, and a pore analysis using optical microscopy was undertaken on images of six soil thin sections （n = 6） （circular and parallel polarizers）. Pore analysis was further undertaken on five horizontal slices of equal dimensions taken through each soil thin section. The porosity samples with low infiltrability （〈 100 mm·hr^-1, n = 4） had greater crust strength, lower porosity （both total and in the least porous slice） and greater water-dispersible ＇day plus silt＇ and silt content than the porosity samples with high infiltrability （〉 100mm·hr^-1, n = 2）. The porosity samples with low infiltrability showed a trend of lower pH and greater water dispersible clay percentage. Porosity varied within the porosity samples due to the presence of dense clay/silt bands （〈 0.5 mm in width） with relatively few air vesicles. The porosity samples with horizontal slices of low porosity （but large numbers of air vesicles） had low infiltrability, while those without slices of low porosity （and relatively few air vesicles） had high infiltrability. We conclude that the intense crusting and resultant low infiltrability of soils in the Knersvlakte appears to be related to the formation of thin, dense clay/silt bands in the pedoderm.  相似文献   

Dynamics of deformation and water flow in heterogeneous porous media and its impact on soil properties     

Shih‐Jung Wang  Kuo‐Chin Hsu 《水文研究》2009,23(25):3569-3582

The interaction of geomechanics and flow within a soil body induces deformation and pore pressure change. Deformation may change hydrogeological and elastic properties, which alters the mechanical behaviour and results in non‐linearity. To investigate this interaction effect in a heterogeneous porous medium, a stochastic poroelastic model is proposed. Monte Carlo simulations are performed to determine the mean and uncertainty of the parameter changes, displacement, and change in pore water pressure. Hydraulic conductivity is treated as the only random variable in the coupled geomechanics‐flow system due to its large variation compared to other mechanical and hydrogeological properties in natural environments. The three considered non‐linear models for the interaction between parameters and deformation are those that consider (1) porosity and hydraulic conductivity; (2) porosity and Young's modulus; and (3) a combined effect that includes porosity, hydraulic conductivity, and Young's modulus. Boundary effects on the coupled system are also explored. The relationships between changes of porosity, hydraulic conductivity, and Young's modulus are analytically shown to be non‐linear. Among the considered parameters, the deformation effect induces the largest reduction in hydraulic conductivity. The deformation‐induced change in hydraulic conductivity shows the most significant effect on the mean and variance of the change in pore water pressure and displacement, while changes in Young's modulus have the least effect. When the deformation effect is considered, the superposition relationship does not exist in the mean displacement and mean change in pore water pressure for the three scenarios considered; it exists for the case without deformation effects. Deformation also causes a reduction in the effective hydraulic conductivity for the whole domain. The scenario that considers both loading and discharge boundaries has larger changes in hydrogeological and geo‐mechanical parameters than those in scenarios that consider loading and discharge boundaries separately. The results indicate that the interaction between deformation and changes in parameters has a profound effect on the poroelastic system. The effect of deformation should thus be considered in modelling and practice. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

用数值计算方法分析潜艇计程仪测速误差     

吴方良  吴晓光  许建  马运义  黄绪琼 《海洋工程》2008,26(3)

介绍潜艇水压式计程仪的使用原理和方法,分别对SUBOFF潜艇在水面和水下两种航行状态进行了三维粘性数值模拟,获得潜艇计程仪相关部位的流场信息,利用这些信息仿效计程仪的测速过程,得出潜艇水压式计程仪"水上标定,水下用"将会使潜艇测速结果低于实际航速的结论.  相似文献