In this study, we used the multi-resolution graph-based clustering （MRGC） method for determining the electrofacies （EF） and lithofacies （LF） from well log data obtained from the intraplatform bank gas fields loc...In this study, we used the multi-resolution graph-based clustering （MRGC） method for determining the electrofacies （EF） and lithofacies （LF） from well log data obtained from the intraplatform bank gas fields located in the Amu Darya Basin. The MRGC could automatically determine the optimal number of clusters without prior knowledge about the structure or cluster numbers of the analyzed data set and allowed the users to control the level of detail actually needed to define the EF. Based on the LF identification and successful EF calibration using core data, an MRGC EF partition model including five clusters and a quantitative LF interpretation chart were constructed. The EF clusters 1 to 5 were interpreted as lagoon, anhydrite flat, interbank, low-energy bank, and high-energy bank, and the coincidence rate in the cored interval could reach 85%. We concluded that the MRGC could be accurately applied to predict the LF in non-cored but logged wells. Therefore, continuous EF clusters were partitioned and corresponding LF were characteristics ＆different LF were analyzed interpreted, and the distribution and petrophysical in the framework of sequence stratigraphy.展开更多
The Ojarly gas field,the major supplier of the Project PhaseⅡof the Right Bank of the Amu Darya River,is just small but valuable like a golden bean,although it has good reservoir properties and a high gas production ...The Ojarly gas field,the major supplier of the Project PhaseⅡof the Right Bank of the Amu Darya River,is just small but valuable like a golden bean,although it has good reservoir properties and a high gas production capacity,the occurrence of continuous sharp decline of pressure in the well production shows a great difference from the previous well test program.In view of this,an integrated analysis method was established for the whole gas well production process to discover the three main reasons causing the abnormal well pressure.First,the formation energy and pressure dropped so fast that the wellhead pressure also fell over the period.Second,there was abnormal fluids pressure drop in the wellbore tube and throttling effect might occur in the production tube,so the pressure drop became abnormally increased.Third,due to the abnormally-increasing gas-yield pressure drop and unusually-decreasing gas productivity,the wellhead oil pressure dropped significantly.Also,through dynamic monitoring and in-depth analysis,it is also considered that due to the high density of drilling fluids and well-developed pores and caverns in the reservoirs,more and more barites separated from the fluids would be settled down covering the pay zones,so both the gas-generating capacity and production pressure significantly decreased.On this basis,some technical countermeasures were taken such as re-stimulation of reservoirs,removal of gas-producing channels,increase of seepage capacity,etc.In addition,by use of sand-flushing and acidizing,both the comprehensive skin factor and the production pressure drop were reduced to improve the well gas production capacity and maintain high productivity effectively.This study provides a technical support for long-term sustainable development and production of this gas field.展开更多
The Callovian-Oxfordian carbonate reservoirs are the most important hydrocarbon reservoir in the Samandepe gas field,Amu Darya basin,Turkmenistan.Based on the analysis of Fe,Mn and Sr trace elements,and carbon,oxygen ...The Callovian-Oxfordian carbonate reservoirs are the most important hydrocarbon reservoir in the Samandepe gas field,Amu Darya basin,Turkmenistan.Based on the analysis of Fe,Mn and Sr trace elements,and carbon,oxygen and strontium isotopes,the genesis and evolutionary characteristics of the carbonate reservoirs were studied,and the conclusions were follows：1） Sustained transgressive-regressive cycles played an important role during Callovian-Oxfordian.The reservoir of reef-bank facies was well developed in the period of transgression,while the regional dense cap rocks developed in the period of regression;2） The 87 Sr/86 Sr ratio measured from rudist shells yields an age of 157.2 Ma according to the global strontium isotope curve;3） As diagenetic intensity increased,δ 13 C changed little,and δ 18 O showed strong negative deviation but was still limited to the range of Late Jurassic seawater.High Fe and Sr contents,and low Mn content,and the evolutionary trend of δ 13 C and δ 18 O all indicate that diagenesis occurred in a relatively confined environment,where the fluids were relatively reducing and contained hot brine.The stage of diagenesis reached is mesodiagenesis,which is very favorable for preservation of primary pores in carbonates;4） Strong dissolution of reef limestones,burial dolomitization and hydrothermal calcite precipitation were all the results of the interaction between the 87 Sr-rich diagenetic fluid and rocks;5） The analysis results of isotopes,fluid inclusions and vitrinite reflectance show that the diagenetic fluid was compaction-released water that originated from the deep,coal-bearing clastic strata.展开更多
目的基于T2^(*)mapping定量分析业余马拉松运动员足踝部关节软骨的T2^(*)值,并分析其与性别、年龄、身体质量指数(body mass index,BMI)、跑龄、跑量之间的相关性。材料与方法于2023年7月份至2023年9月份招募重庆市长跑运动爱好者48名,...目的基于T2^(*)mapping定量分析业余马拉松运动员足踝部关节软骨的T2^(*)值,并分析其与性别、年龄、身体质量指数(body mass index,BMI)、跑龄、跑量之间的相关性。材料与方法于2023年7月份至2023年9月份招募重庆市长跑运动爱好者48名,其中跑量<300 km/月的36例(中低跑量组),跑量≥300 km/月的12例(高跑量组)。所有受试者均进行单侧无症状踝关节的MRI扫描,扫描序列包括T2^(*)mapping多回波自旋回波(spin echo,SE)序列矢状位、质子密度加权成像脂肪抑制(proton density-weighted imaging fat-saturated,PDWI-FS)序列矢状位、冠状位、横轴位以及T1加权脂肪抑制成像(T1-weighted imaging fat-saturated,T1WI-FS)序列横轴位。沿关节软骨轮廓边缘勾画距骨穹窿、跟骰关节跟骨面、骰骨面及后距下关节跟骨面、距骨面软骨作为感兴趣区(region of interest,ROI),获得相应的T2^(*)值。采用线性回归分析软骨T2^(*)值与年龄、BMI、跑龄的相关性,采用独立样本t检验分析不同跑量及不同性别间的软骨T2^(*)值差异。结果(1)距骨穹窿、跟骰关节跟骨面及骰骨面、后距下关节跟骨面及距骨面软骨T2^(*)值在性别上的差异均具有统计学意义(P=0.001、P<0.001、P=0.002、P=0.008、P=0.004);(2)高跑量组的距骨穹窿、后距下关节跟骨面软骨T2^(*)值高于中低跑量组(P=0.014、0.023),不同跑量的跟骰关节跟骨面及骰骨面、后距下关节距骨面软骨T2^(*)值的差异均无统计学意义(P=0.987、0.072、0.724);(3)距骨穹窿、跟骰关节跟骨面及骰骨面、后距下关节跟骨面、距骨面软骨T2^(*)值均与BMI呈正相关(r=0.376、0.384、0.300、0.422、0.455,P=0.005、0.004、0.019、0.001、0.001)。结论在业余马拉松运动员这一跑步群体中,与中低跑量相比,高跑量更有可能导致距骨穹窿、后距下关节跟骨面软骨损伤;而与较低的BMI相比,高BMI增加了距骨穹窿、跟骰关节跟骨面、骰骨面及后距下关节跟骨面、距骨面软骨损伤的风险。展开更多
通过文献计量学方法分析国内外近20年虚拟仿真技术在护理教学中应用的研究热点与前沿趋势。检索2004年8月至2024年8月中国知网(CNKI)和Web of Science(WoS)数据库核心集合相关文献,运用CiteSpace 6.2.R3软件可视化分析作者、国家/地区...通过文献计量学方法分析国内外近20年虚拟仿真技术在护理教学中应用的研究热点与前沿趋势。检索2004年8月至2024年8月中国知网(CNKI)和Web of Science(WoS)数据库核心集合相关文献,运用CiteSpace 6.2.R3软件可视化分析作者、国家/地区、机构、关键词等。最终共纳入中文文献453篇、英文文献1950篇,有关虚拟仿真技术在护理教学中应用的发文量呈逐年上升趋势。国内外发文量最高的杂志分别是《卫生职业教育》及Clinical Simulation in Nursing。中英文发文量最多的作者分别是刘增霞(5篇)、Verkuyl M(18篇);英文发文量最多的国家为美国(898篇),中国排名第五(108篇);中英文发文机构最多的分别是南京中医药大学护理学院(12篇)、美国俄亥俄大学(62篇)。中英文排名前三的高频关键词为护理(78次)、护理教育(78次)、虚拟仿真(65次),nursing education(866次)、education(438次)、simulation(396次);中英文纳入的关键词分别被聚类成10个标签,主要涉及高仿真模拟教学的应用类别、应用场景、教学方法等,未来研究的方向为混合式教学、个性化教学。虚拟仿真技术在护理教学中应用正逐年增加,研究热点逐渐从单一教学向混合性教学过渡,以构建虚拟仿真教学项目基地向完善教学评价及反馈机制转变。展开更多
Rationale:Enteric fever is a major public health problem in developing and underdeveloped counties.Extraintestinal manifestations in typhoid are estimated in 27%cases and are associated with severe and complicated dis...Rationale:Enteric fever is a major public health problem in developing and underdeveloped counties.Extraintestinal manifestations in typhoid are estimated in 27%cases and are associated with severe and complicated diseases.Patients concerns:We report three cases of enteric fever with rare extra intestinal manifestations.Diagnoses:Enteric fever with acute motor-sensory axonal neuropathy,enteric fever with myocarditis,and enteric fever with splenic vein thrombosis.Interventions:All patients were treated with antibiotics.Additionally,Patient 1 was treated with桇immunoglobulin;Patient 2 was treated with vasopressors and anti-cardiac remodeling drugs like ramipril and metoprolol;Patient 3 was treated with anticoagulation with low molecular weight heparin.Outcomes:All patients improved clinically and were followed up on outpatient.Lessons:The diagnosis of enteric fever is challenging and there is an urgent need for prompt-targeted management for better outcomes.Especially in endemic zones and in non-endemic zones as a disease of emporiatric significance.展开更多
基金supported by the National Science and Technology Major Project of China(No.2011ZX05029-003)CNPC Science Research and Technology Development Project,China(No.2013D-0904)
文摘In this study, we used the multi-resolution graph-based clustering （MRGC） method for determining the electrofacies （EF） and lithofacies （LF） from well log data obtained from the intraplatform bank gas fields located in the Amu Darya Basin. The MRGC could automatically determine the optimal number of clusters without prior knowledge about the structure or cluster numbers of the analyzed data set and allowed the users to control the level of detail actually needed to define the EF. Based on the LF identification and successful EF calibration using core data, an MRGC EF partition model including five clusters and a quantitative LF interpretation chart were constructed. The EF clusters 1 to 5 were interpreted as lagoon, anhydrite flat, interbank, low-energy bank, and high-energy bank, and the coincidence rate in the cored interval could reach 85%. We concluded that the MRGC could be accurately applied to predict the LF in non-cored but logged wells. Therefore, continuous EF clusters were partitioned and corresponding LF were characteristics ＆different LF were analyzed interpreted, and the distribution and petrophysical in the framework of sequence stratigraphy.
基金CNPC Scientific Research and Technology DevelopmentProject “Key technology research and application for natural gas developmentof 16.5 m^(3) in the Right Bank of the Amu-Darya River, Turkmenistan” (No.:2011E-2505)National Science and Technology Major Project “Demonstra-tion Project of Natural Gas Development in Middle Zone of the Right Bank ofthe Amu-Darya River” (No.: 2011ZX05059).
文摘The Ojarly gas field,the major supplier of the Project PhaseⅡof the Right Bank of the Amu Darya River,is just small but valuable like a golden bean,although it has good reservoir properties and a high gas production capacity,the occurrence of continuous sharp decline of pressure in the well production shows a great difference from the previous well test program.In view of this,an integrated analysis method was established for the whole gas well production process to discover the three main reasons causing the abnormal well pressure.First,the formation energy and pressure dropped so fast that the wellhead pressure also fell over the period.Second,there was abnormal fluids pressure drop in the wellbore tube and throttling effect might occur in the production tube,so the pressure drop became abnormally increased.Third,due to the abnormally-increasing gas-yield pressure drop and unusually-decreasing gas productivity,the wellhead oil pressure dropped significantly.Also,through dynamic monitoring and in-depth analysis,it is also considered that due to the high density of drilling fluids and well-developed pores and caverns in the reservoirs,more and more barites separated from the fluids would be settled down covering the pay zones,so both the gas-generating capacity and production pressure significantly decreased.On this basis,some technical countermeasures were taken such as re-stimulation of reservoirs,removal of gas-producing channels,increase of seepage capacity,etc.In addition,by use of sand-flushing and acidizing,both the comprehensive skin factor and the production pressure drop were reduced to improve the well gas production capacity and maintain high productivity effectively.This study provides a technical support for long-term sustainable development and production of this gas field.
文摘The Callovian-Oxfordian carbonate reservoirs are the most important hydrocarbon reservoir in the Samandepe gas field,Amu Darya basin,Turkmenistan.Based on the analysis of Fe,Mn and Sr trace elements,and carbon,oxygen and strontium isotopes,the genesis and evolutionary characteristics of the carbonate reservoirs were studied,and the conclusions were follows：1） Sustained transgressive-regressive cycles played an important role during Callovian-Oxfordian.The reservoir of reef-bank facies was well developed in the period of transgression,while the regional dense cap rocks developed in the period of regression;2） The 87 Sr/86 Sr ratio measured from rudist shells yields an age of 157.2 Ma according to the global strontium isotope curve;3） As diagenetic intensity increased,δ 13 C changed little,and δ 18 O showed strong negative deviation but was still limited to the range of Late Jurassic seawater.High Fe and Sr contents,and low Mn content,and the evolutionary trend of δ 13 C and δ 18 O all indicate that diagenesis occurred in a relatively confined environment,where the fluids were relatively reducing and contained hot brine.The stage of diagenesis reached is mesodiagenesis,which is very favorable for preservation of primary pores in carbonates;4） Strong dissolution of reef limestones,burial dolomitization and hydrothermal calcite precipitation were all the results of the interaction between the 87 Sr-rich diagenetic fluid and rocks;5） The analysis results of isotopes,fluid inclusions and vitrinite reflectance show that the diagenetic fluid was compaction-released water that originated from the deep,coal-bearing clastic strata.
文摘通过文献计量学方法分析国内外近20年虚拟仿真技术在护理教学中应用的研究热点与前沿趋势。检索2004年8月至2024年8月中国知网(CNKI)和Web of Science(WoS)数据库核心集合相关文献,运用CiteSpace 6.2.R3软件可视化分析作者、国家/地区、机构、关键词等。最终共纳入中文文献453篇、英文文献1950篇,有关虚拟仿真技术在护理教学中应用的发文量呈逐年上升趋势。国内外发文量最高的杂志分别是《卫生职业教育》及Clinical Simulation in Nursing。中英文发文量最多的作者分别是刘增霞(5篇)、Verkuyl M(18篇);英文发文量最多的国家为美国(898篇),中国排名第五(108篇);中英文发文机构最多的分别是南京中医药大学护理学院(12篇)、美国俄亥俄大学(62篇)。中英文排名前三的高频关键词为护理(78次)、护理教育(78次)、虚拟仿真(65次),nursing education(866次)、education(438次)、simulation(396次);中英文纳入的关键词分别被聚类成10个标签,主要涉及高仿真模拟教学的应用类别、应用场景、教学方法等,未来研究的方向为混合式教学、个性化教学。虚拟仿真技术在护理教学中应用正逐年增加,研究热点逐渐从单一教学向混合性教学过渡,以构建虚拟仿真教学项目基地向完善教学评价及反馈机制转变。
文摘Rationale:Enteric fever is a major public health problem in developing and underdeveloped counties.Extraintestinal manifestations in typhoid are estimated in 27%cases and are associated with severe and complicated diseases.Patients concerns:We report three cases of enteric fever with rare extra intestinal manifestations.Diagnoses:Enteric fever with acute motor-sensory axonal neuropathy,enteric fever with myocarditis,and enteric fever with splenic vein thrombosis.Interventions:All patients were treated with antibiotics.Additionally,Patient 1 was treated with桇immunoglobulin;Patient 2 was treated with vasopressors and anti-cardiac remodeling drugs like ramipril and metoprolol;Patient 3 was treated with anticoagulation with low molecular weight heparin.Outcomes:All patients improved clinically and were followed up on outpatient.Lessons:The diagnosis of enteric fever is challenging and there is an urgent need for prompt-targeted management for better outcomes.Especially in endemic zones and in non-endemic zones as a disease of emporiatric significance.
