学科分类
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10 个结果
  • 简介:Usingthehigh-qualityobservedmeteorologicaldata,changesofthethermalconditionsandprecipitationovertheNorthChinaPlainfrom1961to2009wereexamined.Trendsofaccumulatedtemperatureandnegativetemperature,growingseasonduration,aswellasseasonalandannualrainfallsat48stationswereanalyzed.Theresultsshowthattheaccumulatedtemperatureincreasedsignificantlyby348.5℃dayduetoglobalwarmingduring1961-2009whiletheabsoluteaccumulatednegativetemperaturedecreasedapparentlyby175.3℃day.Thestartofgrowingseasondisplayedasignificantnegativetrendof-14.3daysduring1961-2009,buttheendofgrowingseasondelayedinsignificantlyby6.7days.Asaresult,thelengthofgrowingseasonincreasedby21.0days.Theannualandautumnrainfallsdecreasedslightlywhilesummerrainfallandsummerrainydaysdecreasedsignificantly.Incontrast,springrainfallincreasedslightlywithoutsignificanttrends.AlltheresultsindicatethatthethermalconditionswereimprovedtobenefitthecropgrowthovertheNorthChinaPlainduring1961-2009,andthedecreasingannualandsummerrainfallshadnodirectnegativeimpactonthecropgrowth.ButthedecreasingsummerrainfallwaslikelytoinfluencethewaterresourcesinNorthChina,especiallytheundergroundwater,reservoirwater,aswellasriverrunoff,whichwouldhaveinfluencedtheirrigationofagriculture.

  • 标签: 生长季节 华北平原 降水量 积温 夏季降水 年降雨量
  • 简介:ChunguangoilfieldisanewfocusoftheexplorationinJunnggarBasinwiththeheavycrudeoildistributinginJurassic,CretaceousandTertiarystrata.Basedontheanalysisofthegeochemistryandfluidinclusioninthereservoirs,thesource,accumulatedperiodandprocessoftheheavycrudeoilreservoirhasbeeninvestigated.Theresultsindicatethattheheavycrudeoilcanbedividedintothreetypesbasedonthedegradationandsources.TheheavycrudeoilwasmainlyderivedfromthePermiansourcerocks,andlatterlymixedbytheheavycrudeoilgeneratedbytheJurassicsourcerocks.Theaccumulatedperiodoftheheavycrudeoilhastwostages.OnewasrangedfromCretaceoustoPaleogeneandtheheavycrudeoilwassourcedfromPermiansourcerocksoftheShawandepressionandlatterlymixedbytheheavycrudeoilgeneratedbytheJurassicsourcerocks.ThesecondperiodwasfromNeogenetopresentandtheheavycrudeoilwasmainlyderivedfromtheJurassicsourcerocks.Combinedwiththegeologicalevolution,theheavycrudeoilaccumulatedprocesshasbeenrecovered.

  • 标签: 重质原油 地球化学特征 准葛尔盆地 油田 春光 累积