孔隙度是研究页岩气储层最基本的参数之一,通常采用美国天然气研究所(Gas Research Institute,以下缩写为GRI)的方法测定页岩总孔隙度。为了解决GRI方法存在的样品总体积测量不准和烘干温度、粉碎粒径大小、饱和压力以及平衡时间等参数...孔隙度是研究页岩气储层最基本的参数之一,通常采用美国天然气研究所(Gas Research Institute,以下缩写为GRI)的方法测定页岩总孔隙度。为了解决GRI方法存在的样品总体积测量不准和烘干温度、粉碎粒径大小、饱和压力以及平衡时间等参数缺乏技术规范等问题,选取四川盆地荣昌地区下志留统龙马溪组海相页岩为研究对象,引入材料学科GeoPyc 1360体积测定仪和AccuPyc Ⅱ1340固体密度仪联合测量页岩总孔隙度,探讨样品烘干温度、粉碎粒径、样品洗油、饱和压力和平衡时间等因素对页岩孔隙度测定结果的影响情况。实验研究结果表明:①页岩样品孔隙度测定的最佳烘干温度为110℃,温度过高有可能会改变页岩孔隙结构;②孔隙度测定的最佳粒径为10.00~0.25 mm,粒径过小有可能破坏页岩的骨架结构;③高成熟页岩孔隙度测定样品不需洗油;④最佳饱和压力选择0.66~1.03 MPa,平衡时间不少于10 min。结论认为,通过对孔隙度GRI测定方法优化,实现了页岩不规则样品外观总体积的测量,给出了海相页岩孔隙度测量适宜的预处理条件和测试参数,改进后的方法可以节约钻取柱塞样的成本、缩短测定时间,并且能够满足页岩气勘探开发实验的需求。展开更多
The pore structure characteristic parameters of vuggy carbonate reservoirs were extracted,and matrix resistivity of vuggy reservoir was calculated by the percolation network simulation.A segmented cross-scale resistiv...The pore structure characteristic parameters of vuggy carbonate reservoirs were extracted,and matrix resistivity of vuggy reservoir was calculated by the percolation network simulation.A segmented cross-scale resistivity calculation method was established,in which the finite element method was used to simulate the resistivity of vuggy reservoirs.The mathematical models of vug porosity and water saturation with rock resistivity in vuggy carbonate reservoir were established,and the relationships between them were obtained.Experimental results verified the reliability of the simulation results.The method presented provides new technical means and research method for the resistivity log interpretation of vuggy carbonate reservoirs.The matrix porosity,vug porosity and matrix pore water saturation are the key factors determining the resistivity of reservoir rocks.展开更多
目的探讨原发性高血压患者不同体位血浆醛固酮浓度(PAC)和脉压(PP)之间的相关性。方法连续选取2008年10月至2010年10月就诊于新疆维吾尔自治区高血压诊疗研究中心的高血压患者195例,所有受试者均成功完成立、卧、坐三体位刺激试验,分别...目的探讨原发性高血压患者不同体位血浆醛固酮浓度(PAC)和脉压(PP)之间的相关性。方法连续选取2008年10月至2010年10月就诊于新疆维吾尔自治区高血压诊疗研究中心的高血压患者195例,所有受试者均成功完成立、卧、坐三体位刺激试验,分别测量三体位的血压和PAC。按照平均PP划分为正常PP组(PP<40 mm Hg)和PP增大组(PP≥40 mm Hg),比较2组间临床指标的差异,分析PP与醛固酮水平的相关性。结果 (1)不同PP水平的2组间比较,PP≥40 mm Hg患者平均血钾水平明显高于PP<40 mm Hg患者(P=0.01)。相关分析提示,矫正了血清钾、年龄、性别后,PP和直立位PAC(r=0.235,P=0.001)、坐位PAC(r=0.220,P=0.002)及仰卧位PAC(r=0.166,P=0.021)均存在正相关。(3)2组间比较显示,不管任何体位,PP≥40 mm Hg患者PAC明显高于PP<40 mm Hg患者。直立位和坐位PAC>12 ng/dl患者比PAC≤12 ng/dl患者平均PP更大。(4)以PP是否≥40 mm Hg作为因变量,年龄、血钾、体重指数及三体位的PAC为自变量分别建立Logistics回归模型,分析发现血清K^+[OR=0.043,95%CI:1.09(1.00~1.12)]以及PAC[OR=0.025,95%CI:0.35(0.13~0.88)]均为PP增大的风险因素。结论无论是立位、坐位还是卧位,血清PAC水平增高和PP增大有一定的相关性,提示较高水平的PAC是高血压患者动脉弹性下降的危险因素。展开更多
基金Supported by the National Natural Science Foundation of China(U1562217)
文摘The pore structure characteristic parameters of vuggy carbonate reservoirs were extracted,and matrix resistivity of vuggy reservoir was calculated by the percolation network simulation.A segmented cross-scale resistivity calculation method was established,in which the finite element method was used to simulate the resistivity of vuggy reservoirs.The mathematical models of vug porosity and water saturation with rock resistivity in vuggy carbonate reservoir were established,and the relationships between them were obtained.Experimental results verified the reliability of the simulation results.The method presented provides new technical means and research method for the resistivity log interpretation of vuggy carbonate reservoirs.The matrix porosity,vug porosity and matrix pore water saturation are the key factors determining the resistivity of reservoir rocks.
文摘目的探讨原发性高血压患者不同体位血浆醛固酮浓度(PAC)和脉压(PP)之间的相关性。方法连续选取2008年10月至2010年10月就诊于新疆维吾尔自治区高血压诊疗研究中心的高血压患者195例,所有受试者均成功完成立、卧、坐三体位刺激试验,分别测量三体位的血压和PAC。按照平均PP划分为正常PP组(PP<40 mm Hg)和PP增大组(PP≥40 mm Hg),比较2组间临床指标的差异,分析PP与醛固酮水平的相关性。结果 (1)不同PP水平的2组间比较,PP≥40 mm Hg患者平均血钾水平明显高于PP<40 mm Hg患者(P=0.01)。相关分析提示,矫正了血清钾、年龄、性别后,PP和直立位PAC(r=0.235,P=0.001)、坐位PAC(r=0.220,P=0.002)及仰卧位PAC(r=0.166,P=0.021)均存在正相关。(3)2组间比较显示,不管任何体位,PP≥40 mm Hg患者PAC明显高于PP<40 mm Hg患者。直立位和坐位PAC>12 ng/dl患者比PAC≤12 ng/dl患者平均PP更大。(4)以PP是否≥40 mm Hg作为因变量,年龄、血钾、体重指数及三体位的PAC为自变量分别建立Logistics回归模型,分析发现血清K^+[OR=0.043,95%CI:1.09(1.00~1.12)]以及PAC[OR=0.025,95%CI:0.35(0.13~0.88)]均为PP增大的风险因素。结论无论是立位、坐位还是卧位,血清PAC水平增高和PP增大有一定的相关性,提示较高水平的PAC是高血压患者动脉弹性下降的危险因素。
