目的分析国内外关于重型新型冠状病毒肺炎(新冠肺炎)的研究热点及研究前沿。方法用CiteSpace软件分别对中国知网(CNKI)及科学网(Web of Science)两个数据库2020年1月30日至4月20日发表的重型新冠肺炎相关研究进行可视化分析,分析内容包...目的分析国内外关于重型新型冠状病毒肺炎(新冠肺炎)的研究热点及研究前沿。方法用CiteSpace软件分别对中国知网(CNKI)及科学网(Web of Science)两个数据库2020年1月30日至4月20日发表的重型新冠肺炎相关研究进行可视化分析,分析内容包括文献的作者、发文机构、高频关键词等。结果共纳入389篇中文文献及59篇英文文献。用CiteSpace软件分析显示,目前国内主要有4个比较大的团队关注重型新冠肺炎相关研究,各团队内部合著较紧密,但团队之间合作欠佳;发文机构以高等院校附属医院为主,高等院校及企业参与较少。英文发文作者主要有5个研究团队,部分有合著关系;英文发文量最多的国家为中国,其次是美国、加拿大。中文关键词共现、聚类及突现词分析显示,新冠肺炎主要研究领域包括临床特征、中医药治疗、医学影像学、中西医结合治疗等;核酸检测、临床特点及临床诊断,瘟疫理论及病因机制、中医药及中西医结合治疗、重型新冠肺炎合并糖尿病及预后研究将成为今后的研究趋势,词聚类分析新冠肺炎、合并慢性基础疾病、CT影像学特征也将成为该领域研究的新趋势。英文文献关键词共现分析显示,新冠肺炎主要研究领域包括新型冠状病毒名称、疾病大流行、传染性疾病、医疗物资分配、心肌损害相关指标等。结论国内外研究者对新冠肺炎的关注点并不完全相同,国内以研究重症临床诊断及治疗为主,国外则重视疫情应对及预防。展开更多
The reservoirs of the Upper Triassic Xujiahe Formation in Sichuan Basin have the characteristics of low compositional maturity, low contents of cements and medium textural maturity. The general physical properties of ...The reservoirs of the Upper Triassic Xujiahe Formation in Sichuan Basin have the characteristics of low compositional maturity, low contents of cements and medium textural maturity. The general physical properties of the reservoirs are poor, with low porosity and low permeability, and there are only a few reservoirs with medium porosity and low permeability in local areas. Based on the diagenetic mineral association, a diagenetic sequence of cements is established: early calcites (or micrite siderites) →first quartz overgrowth→chlorite coatings→dissolution of feldspars and debris→chlorite linings→ second quartz overgrowth (quartz widen or filled in remain intergranular pores and solution pores)→dissolution→third quartz overgrowth (quartz filled in intergranular and intragranular solution pores)→intergrowth (ferro) calcites→dolomites→ferro (calcites) dolomites→later dissolution→veins of quartz and calcites formation. Mechanical compaction is the main factor in making the reservoirs tight in the basin, followed by the second and third quartz overgrowth. In a long-term closed system, only feld-spars and some lithic fragments are dissolved by diagenetic fluids, while intergranular cements such as quartz and calcit are not dissolved and thus have little influence on the porosity of the Xujiahe Formation. This is the third factor that may have kept the sandstones of Xujiahe Formation tight finally. The hydrocarbon was extensively generated from organic materials after the second quartz overgrowth, and selectively entered favorable reservoirs to form tight sandstone gas reservoirs.展开更多
文摘目的分析国内外关于重型新型冠状病毒肺炎(新冠肺炎)的研究热点及研究前沿。方法用CiteSpace软件分别对中国知网(CNKI)及科学网(Web of Science)两个数据库2020年1月30日至4月20日发表的重型新冠肺炎相关研究进行可视化分析,分析内容包括文献的作者、发文机构、高频关键词等。结果共纳入389篇中文文献及59篇英文文献。用CiteSpace软件分析显示,目前国内主要有4个比较大的团队关注重型新冠肺炎相关研究,各团队内部合著较紧密,但团队之间合作欠佳;发文机构以高等院校附属医院为主,高等院校及企业参与较少。英文发文作者主要有5个研究团队,部分有合著关系;英文发文量最多的国家为中国,其次是美国、加拿大。中文关键词共现、聚类及突现词分析显示,新冠肺炎主要研究领域包括临床特征、中医药治疗、医学影像学、中西医结合治疗等;核酸检测、临床特点及临床诊断,瘟疫理论及病因机制、中医药及中西医结合治疗、重型新冠肺炎合并糖尿病及预后研究将成为今后的研究趋势,词聚类分析新冠肺炎、合并慢性基础疾病、CT影像学特征也将成为该领域研究的新趋势。英文文献关键词共现分析显示,新冠肺炎主要研究领域包括新型冠状病毒名称、疾病大流行、传染性疾病、医疗物资分配、心肌损害相关指标等。结论国内外研究者对新冠肺炎的关注点并不完全相同,国内以研究重症临床诊断及治疗为主,国外则重视疫情应对及预防。
基金the National Basic Research Program of China (Grant No. 2007CB209500)the Eleventh Five Year Key Science and Technology Item of PetroChina (Grant No. 07-01A-01)
文摘The reservoirs of the Upper Triassic Xujiahe Formation in Sichuan Basin have the characteristics of low compositional maturity, low contents of cements and medium textural maturity. The general physical properties of the reservoirs are poor, with low porosity and low permeability, and there are only a few reservoirs with medium porosity and low permeability in local areas. Based on the diagenetic mineral association, a diagenetic sequence of cements is established: early calcites (or micrite siderites) →first quartz overgrowth→chlorite coatings→dissolution of feldspars and debris→chlorite linings→ second quartz overgrowth (quartz widen or filled in remain intergranular pores and solution pores)→dissolution→third quartz overgrowth (quartz filled in intergranular and intragranular solution pores)→intergrowth (ferro) calcites→dolomites→ferro (calcites) dolomites→later dissolution→veins of quartz and calcites formation. Mechanical compaction is the main factor in making the reservoirs tight in the basin, followed by the second and third quartz overgrowth. In a long-term closed system, only feld-spars and some lithic fragments are dissolved by diagenetic fluids, while intergranular cements such as quartz and calcit are not dissolved and thus have little influence on the porosity of the Xujiahe Formation. This is the third factor that may have kept the sandstones of Xujiahe Formation tight finally. The hydrocarbon was extensively generated from organic materials after the second quartz overgrowth, and selectively entered favorable reservoirs to form tight sandstone gas reservoirs.
