The geological characteristics and production practices of the major middle-and high-maturity shale oil exploration areas in China are analyzed.Combined with laboratory results,it is clear that three essential conditi...The geological characteristics and production practices of the major middle-and high-maturity shale oil exploration areas in China are analyzed.Combined with laboratory results,it is clear that three essential conditions,i.e.economic initial production,commercial cumulative oil production of single well,and large-scale recoverable reserves confirmed by the testing production,determine whether the continental shale oil can be put into large-scale commercial development.The quantity and quality of movable hydrocarbons are confirmed to be crucial to economic development of shale oil,and focuses in evaluation of shale oil enrichment area/interval.The evaluation indexes of movable hydrocarbon enrichment include:(1)the material basis for forming retained hydrocarbon,including TOC>2%(preferentially 3%-4%),and typeⅠ-Ⅱkerogens;(2)the mobility of retained hydrocarbon,which is closely related to the hydrocarbon composition and flow behaviors of light/heavy components,and can be evaluated from the perspectives of thermal maturity(Ro),gas-oil ratio(GOR),crude oil density,quality of hydrocarbon components,preservation conditions;and(3)the reservoir characteristics associated with the engineering reconstruction,including the main pore throat distribution zone,reservoir physical properties(including fractures),lamellation feature and diagenetic stage,etc.Accordingly,13 evaluation indexes in three categories and their reference values are established.The evaluation indicates that the light shale oil zones in the Gulong Sag of Songliao Basin have the most favorable enrichment conditions of movable hydrocarbons,followed by light oil and black oil zones,containing 20.8×10^(8) t light oil resources in reservoirs with R_(0)>1.2%,pressure coefficient greater than 1.4,effective porosity greater than 6%,crude oil density less than 0.82 g/cm^(3),and GOR>100 m/m^(3).The shale oil in the Gulong Sag can be explored and developed separately by the categories(resource sweet spot,engineering sweet spot,and tight oil sweet spot)depending on shale oil flowability.The Gulong Sag is the most promising area to achieve large-scale breakthrough and production of continental shale oil in China.展开更多
目的分析内听道重复畸形(duplication of the internal auditory canal,DIAC)患者CT及MRI影像学表现,提高对该畸形的认识,为人工耳蜗植入提供术前依据。方法回顾性观察20例(24耳)DIAC患者内耳多层螺旋CT(MSCT)及MRI资料,测量并分析病变...目的分析内听道重复畸形(duplication of the internal auditory canal,DIAC)患者CT及MRI影像学表现,提高对该畸形的认识,为人工耳蜗植入提供术前依据。方法回顾性观察20例(24耳)DIAC患者内耳多层螺旋CT(MSCT)及MRI资料,测量并分析病变组与对照组内听道及蜗神经孔宽度。结果DIAC均为内听道狭窄及合并其他颞骨畸形。MSCT示21耳、MRI水成像示16耳内听道由骨性分隔成双管。MRI水成像示前庭蜗神经纤细。病变、对照组内听道宽度及蜗神经孔宽度均有统计学差异(P<0.001)。6例(8耳)行人工耳蜗植入术后听力均有不同程度恢复。结论DIAC均显示内听道狭窄,MSCT所示骨性分隔为其特征性征象,MRI水成像示前庭蜗神经发育不良,联合两种影像检查方法可为本病诊断和人工听觉植入提供客观参考依据。展开更多
目的:通过Meta分析的方法分析超声造影(CEUS)和常规超声在甲状腺结节热消融术中的临床应用价值。方法:检索中国知网、维普、万方、PubMed、Web of science等数据库,比较CEUS和常规超声在甲状腺结节热消融术中的临床价值对照研究,检索时...目的:通过Meta分析的方法分析超声造影(CEUS)和常规超声在甲状腺结节热消融术中的临床应用价值。方法:检索中国知网、维普、万方、PubMed、Web of science等数据库,比较CEUS和常规超声在甲状腺结节热消融术中的临床价值对照研究,检索时限均从建库至2023年5月。使用RevMan软件进行Meta分析。结果:纳入25篇文献。结果显示:CEUS组完全消融率优于常规超声组[OR=9.65,95%CI(5.75,16.18)];常规超声组热消融术后6个月FT3、FT4水平变化低于CEUS组[FT3水平MD=0.81,95%CI(0.56,1.06);FT4水平MD=2.26,95%CI(1.34,3.18)];常规超声组热消融术后6个月、12个月体积变化低于CEUS组[术后6个月MD=0.35,95%CI(0.26,0.44);术后12个月MD=0.39,95%CI(0.30,0.49)];CEUS组结节复发率低于常规超声组[OR=0.16,95%CI(0.08,0.29)];两组均出现疼痛、发热、颈部血肿等不良反应,但均未出现严重并发症,且CEUS组安全性较常规超声组好[OR=0.31,95%CI(0.20,0.49)]。结论:CEUS技术应用于指导甲状腺结节热消融术较常规超声更准确有效,值得临床推广。展开更多
基金Supported by the National Natural Science Foundation of China(U22B6004)the PetroChina Research Institute of Petroleum Exploration&Development Project(2022yjcq03).
文摘The geological characteristics and production practices of the major middle-and high-maturity shale oil exploration areas in China are analyzed.Combined with laboratory results,it is clear that three essential conditions,i.e.economic initial production,commercial cumulative oil production of single well,and large-scale recoverable reserves confirmed by the testing production,determine whether the continental shale oil can be put into large-scale commercial development.The quantity and quality of movable hydrocarbons are confirmed to be crucial to economic development of shale oil,and focuses in evaluation of shale oil enrichment area/interval.The evaluation indexes of movable hydrocarbon enrichment include:(1)the material basis for forming retained hydrocarbon,including TOC>2%(preferentially 3%-4%),and typeⅠ-Ⅱkerogens;(2)the mobility of retained hydrocarbon,which is closely related to the hydrocarbon composition and flow behaviors of light/heavy components,and can be evaluated from the perspectives of thermal maturity(Ro),gas-oil ratio(GOR),crude oil density,quality of hydrocarbon components,preservation conditions;and(3)the reservoir characteristics associated with the engineering reconstruction,including the main pore throat distribution zone,reservoir physical properties(including fractures),lamellation feature and diagenetic stage,etc.Accordingly,13 evaluation indexes in three categories and their reference values are established.The evaluation indicates that the light shale oil zones in the Gulong Sag of Songliao Basin have the most favorable enrichment conditions of movable hydrocarbons,followed by light oil and black oil zones,containing 20.8×10^(8) t light oil resources in reservoirs with R_(0)>1.2%,pressure coefficient greater than 1.4,effective porosity greater than 6%,crude oil density less than 0.82 g/cm^(3),and GOR>100 m/m^(3).The shale oil in the Gulong Sag can be explored and developed separately by the categories(resource sweet spot,engineering sweet spot,and tight oil sweet spot)depending on shale oil flowability.The Gulong Sag is the most promising area to achieve large-scale breakthrough and production of continental shale oil in China.
文摘目的分析内听道重复畸形(duplication of the internal auditory canal,DIAC)患者CT及MRI影像学表现,提高对该畸形的认识,为人工耳蜗植入提供术前依据。方法回顾性观察20例(24耳)DIAC患者内耳多层螺旋CT(MSCT)及MRI资料,测量并分析病变组与对照组内听道及蜗神经孔宽度。结果DIAC均为内听道狭窄及合并其他颞骨畸形。MSCT示21耳、MRI水成像示16耳内听道由骨性分隔成双管。MRI水成像示前庭蜗神经纤细。病变、对照组内听道宽度及蜗神经孔宽度均有统计学差异(P<0.001)。6例(8耳)行人工耳蜗植入术后听力均有不同程度恢复。结论DIAC均显示内听道狭窄,MSCT所示骨性分隔为其特征性征象,MRI水成像示前庭蜗神经发育不良,联合两种影像检查方法可为本病诊断和人工听觉植入提供客观参考依据。
文摘目的:通过Meta分析的方法分析超声造影(CEUS)和常规超声在甲状腺结节热消融术中的临床应用价值。方法:检索中国知网、维普、万方、PubMed、Web of science等数据库,比较CEUS和常规超声在甲状腺结节热消融术中的临床价值对照研究,检索时限均从建库至2023年5月。使用RevMan软件进行Meta分析。结果:纳入25篇文献。结果显示:CEUS组完全消融率优于常规超声组[OR=9.65,95%CI(5.75,16.18)];常规超声组热消融术后6个月FT3、FT4水平变化低于CEUS组[FT3水平MD=0.81,95%CI(0.56,1.06);FT4水平MD=2.26,95%CI(1.34,3.18)];常规超声组热消融术后6个月、12个月体积变化低于CEUS组[术后6个月MD=0.35,95%CI(0.26,0.44);术后12个月MD=0.39,95%CI(0.30,0.49)];CEUS组结节复发率低于常规超声组[OR=0.16,95%CI(0.08,0.29)];两组均出现疼痛、发热、颈部血肿等不良反应,但均未出现严重并发症,且CEUS组安全性较常规超声组好[OR=0.31,95%CI(0.20,0.49)]。结论:CEUS技术应用于指导甲状腺结节热消融术较常规超声更准确有效,值得临床推广。
