The lacustrine shale of deep Shahezi Formation in the Songliao basin has great gas potential,but its pore evolution,heterogeneity,and connectivity characteristics remain unclear.In this work,total organic carbon analy...The lacustrine shale of deep Shahezi Formation in the Songliao basin has great gas potential,but its pore evolution,heterogeneity,and connectivity characteristics remain unclear.In this work,total organic carbon analysis,rock pyrolysis,X-ray diffraction field emission scanning electron microscopy,the particle and crack analysis system software,low-temperature nitrogen adsorption experiment,fractal theory,high-pressure mercury injection experiment and nuclear magnetic resonance experiment were used to study the Shahezi shale from Well SK-2.The result indicated that the organic pores in Shahezi shale are not developed,and the intergranular and intragranular pores are mainly formed by illitedominated clay.As the burial depth increases,the pore size and slit-shaped pores formed by clay decrease,and dissolved pores in the feldspar and carbonate minerals and dissolved fractures in the quartz increase.The pore evolution is affected by clay,compaction,and high-temperature corrosion.Based on the pore structure characteristics reflected by the pore size distribution and pore structure parameters obtained by multiple experimental methods,the pore development and evolution are divided into three stages.During stageⅠandⅡ,the pore heterogeneity of the shale reservoirs increases with the depth,the physical properties and pore connectivity deteriorate,but the gas-bearing property is good.In stageⅢ,the pore heterogeneity is the highest,its gas generation and storage capacity are low,but the increase of micro-fractures makes pore connectivity and gas-bearing better.展开更多
目的分析野外军训中床旁即时检测仪(point of care testing,POCT)检测尿液肌红蛋白(myoglobin,Mb)的应用价值。方法选取2019年10月8-10月19日某军校参加野外军训的新学员,采集其第1天训练后和最后1天训练后的血清和尿液样本,比较第1天...目的分析野外军训中床旁即时检测仪(point of care testing,POCT)检测尿液肌红蛋白(myoglobin,Mb)的应用价值。方法选取2019年10月8-10月19日某军校参加野外军训的新学员,采集其第1天训练后和最后1天训练后的血清和尿液样本,比较第1天和最后1天训练后的血清Mb和尿液Mb;以血清肌酸激酶(creatine kinase,CK)为检测肌肉损伤的标准,比较第1天训练后血清Mb与尿液Mb的敏感度和准确度。结果65名新学员,均为男性,平均年龄18岁。相较于第1天,最后1天训练后POCT仪检测的尿液Mb水平明显下降(下降90.4%),差异有统计学意义(P<0.01)。第1天训练后,血清检测CK阳性40例,血清Mb阳性2例,POCT仪检测尿液Mb阳性19例;血清Mb诊断肌肉损伤的敏感度为5.0%,显著低于尿液Mb的敏感度47.5%(P<0.001);血清Mb和尿液Mb的特异性均为100%;血清Mb的准确度小于尿液Mb的准确度(41.5%vs 67.7%,P=0.003)。结论相较于检测血清Mb,POCT仪检测尿液Mb敏感度和准确度更高,且尿液样本获取方便,POCT仪容易携带,因此POCT仪检测尿液Mb适用于野外军训条件下身体训练状态的预警监测。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.42072168 and 41802156)the National Key R&D Program of China(Grant No.2019YFC0605405)the Fundamental Research Funds for the Central Universities(Grant Nos.2023ZKPYDC07 and 2022YQDC06)。
文摘The lacustrine shale of deep Shahezi Formation in the Songliao basin has great gas potential,but its pore evolution,heterogeneity,and connectivity characteristics remain unclear.In this work,total organic carbon analysis,rock pyrolysis,X-ray diffraction field emission scanning electron microscopy,the particle and crack analysis system software,low-temperature nitrogen adsorption experiment,fractal theory,high-pressure mercury injection experiment and nuclear magnetic resonance experiment were used to study the Shahezi shale from Well SK-2.The result indicated that the organic pores in Shahezi shale are not developed,and the intergranular and intragranular pores are mainly formed by illitedominated clay.As the burial depth increases,the pore size and slit-shaped pores formed by clay decrease,and dissolved pores in the feldspar and carbonate minerals and dissolved fractures in the quartz increase.The pore evolution is affected by clay,compaction,and high-temperature corrosion.Based on the pore structure characteristics reflected by the pore size distribution and pore structure parameters obtained by multiple experimental methods,the pore development and evolution are divided into three stages.During stageⅠandⅡ,the pore heterogeneity of the shale reservoirs increases with the depth,the physical properties and pore connectivity deteriorate,but the gas-bearing property is good.In stageⅢ,the pore heterogeneity is the highest,its gas generation and storage capacity are low,but the increase of micro-fractures makes pore connectivity and gas-bearing better.
文摘目的分析野外军训中床旁即时检测仪(point of care testing,POCT)检测尿液肌红蛋白(myoglobin,Mb)的应用价值。方法选取2019年10月8-10月19日某军校参加野外军训的新学员,采集其第1天训练后和最后1天训练后的血清和尿液样本,比较第1天和最后1天训练后的血清Mb和尿液Mb;以血清肌酸激酶(creatine kinase,CK)为检测肌肉损伤的标准,比较第1天训练后血清Mb与尿液Mb的敏感度和准确度。结果65名新学员,均为男性,平均年龄18岁。相较于第1天,最后1天训练后POCT仪检测的尿液Mb水平明显下降(下降90.4%),差异有统计学意义(P<0.01)。第1天训练后,血清检测CK阳性40例,血清Mb阳性2例,POCT仪检测尿液Mb阳性19例;血清Mb诊断肌肉损伤的敏感度为5.0%,显著低于尿液Mb的敏感度47.5%(P<0.001);血清Mb和尿液Mb的特异性均为100%;血清Mb的准确度小于尿液Mb的准确度(41.5%vs 67.7%,P=0.003)。结论相较于检测血清Mb,POCT仪检测尿液Mb敏感度和准确度更高,且尿液样本获取方便,POCT仪容易携带,因此POCT仪检测尿液Mb适用于野外军训条件下身体训练状态的预警监测。
