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塔里木盆地低电阻率油层成因与评价 总被引:5,自引:0,他引:5
随着塔里木盆地油气勘探工作的深入, 相继发现了一批低电阻油层, 油层电阻率最低达0.4 5Ω·m, 与水层的电阻率几乎相当.通过对轮南侏罗系JⅣ、吉拉克三叠系TⅡ和哈得逊石炭系CⅢ 3套低电阻油层的地质与实验分析认为, 引起低电阻的主要原因是黄铁矿的局部富集、粘土矿物以及高矿化度束缚水等的附加导电, 提出利用毛管压力资料, 建立油藏物性、油层高度与含油饱和度的关系以及采用高温高压岩电参数等不同的评价方法, 从而使计算的饱和度提高8%~ 2 5 %, 测井解释符合率上升5 %~ 8%. 相似文献
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乙二醛交联氧化淀粉粘合剂的研制 总被引:6,自引:0,他引:6
将玉米淀粉用高猛酸钾氧化制得氧化淀粉,用乙二醛进行交联制得粘合剂。实验结果表明,制得的交联氧化淀粉粘合剂的耐水性和干燥速度比普通氧化淀粉粘合剂好。 相似文献
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依据库仑土压力理论假设,挡土墙土压力由墙后填土在极限平衡状态下出现滑动楔体产生,推导出考虑滑裂面上填土的黏聚力、墙土间黏聚力、黏性土表面出现张拉裂缝、条形荷载下的黏性土主动土压力计算式,并给出临界破裂角的显式解答。当墙后作用有连续均布荷载或不考虑黏性填土表面出现裂缝时,只需取条形荷载到墙顶的距离或计算的裂缝深度为0即可按相同的方法求解。研究表明,由于未考虑条形荷载对临界破裂角的影响,规范方法得到土压力值偏小。该公式适用范围广,尤其对于条形荷载作用墙后任意位置时均可应用,对实际工程中挡土墙的设计计算具有一定应用价值。 相似文献
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Yu-Yong Jiao Xiu-Li Zhang Huan-Qiang Zhang Gang-Hai Huang 《Geomechanics and Geoengineering》2014,9(2):133-141
Due to the difficulty of the classical fracture mechanics in dealing with multicrack coalescence, the simulation of jointed rock failure has remained a worldwide problem since the middle of the last century. Through a nearly 10-year effort, we have developed a novel but simple discontinuum-based approach, namely DDARF (discontinuous deformation analysis for rock failure), to simulate the progressive failure process of jointed rock mass. In the proposed method, by adopting the FE adaptive mesh generation technique—the advanced front method, the computational model of triangular DDA block system is automatically established. Also, the randomly distributed mechanical parameters statistically satisfying Weibull’s law are assigned to the blocks to simulate the heterogeneity of rock mass. In the generating process of the block system, numerous artificial joints come into being. These artificial joints provide the potential paths along which the cracks generate and propagate. The two blocks beside an artificial joint are glued together through adhesive algorithm, and if the glue is invalid, the artificial joint will break and turn into a real crack. In this way, the rock fragmentation process can be simulated. The results of several verification examples indicate that the DDARF method can simulate the whole process of rock fragmentation, and is suitable for cases of intact rock, rock mass with non-penetrative joints, and even blocky rock. 相似文献
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直接蒸发单颗粒锆石测定~(207)Pb/~(206)Pb年龄的方法 总被引:1,自引:0,他引:1
在双带源热离子发射质谱计上,用Kober,B.(1987)建立的方法直接蒸发锆石测定~(207)Pb/~(206)Pb表面年龄。4件已知年龄的锆石样品测定结果表明,用该方法测定的年龄值与常规锆石U-Pb一致曲线的上交点年龄一致。使用腈基丙烯酸酯粘合剂,使得装样简单、可靠,并可增加铅离子流强度。文中首次报道了湖北广水蔡家河小河岩体、黄土寨岩体中锆石的形成年龄。 相似文献