简介：~~

简介：~~

简介：~~

简介：~~

简介：~~

简介：~~

简介：

简介：

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.

简介：ChunguangoilfieldisanewfocusoftheexplorationinJunnggarBasinwiththeheavycrudeoildistributinginJurassic,CretaceousandTertiarystrata.Basedontheanalysisofthegeochemistryandfluidinclusioninthereservoirs,thesource,accumulatedperiodandprocessoftheheavycrudeoilreservoirhasbeeninvestigated.Theresultsindicatethattheheavycrudeoilcanbedividedintothreetypesbasedonthedegradationandsources.TheheavycrudeoilwasmainlyderivedfromthePermiansourcerocks,andlatterlymixedbytheheavycrudeoilgeneratedbytheJurassicsourcerocks.Theaccumulatedperiodoftheheavycrudeoilhastwostages.OnewasrangedfromCretaceoustoPaleogeneandtheheavycrudeoilwassourcedfromPermiansourcerocksoftheShawandepressionandlatterlymixedbytheheavycrudeoilgeneratedbytheJurassicsourcerocks.ThesecondperiodwasfromNeogenetopresentandtheheavycrudeoilwasmainlyderivedfromtheJurassicsourcerocks.Combinedwiththegeologicalevolution,theheavycrudeoilaccumulatedprocesshasbeenrecovered.