青藏高原中生界白云岩特征研究及成因分析

:1999208231:1999212227:100020550(2000)0420555205122131(151400)2(1632123(163414),,,,:,,,:1974P588.24+5A1,,(E8196,N3035),(1),,,1Fig.1ThemapofstructuraldivisionofQingzangPlateauandlocationofstudyareasanddistributionofdolomite30104km2,,15004000m,,;,,,;,1,,,1Table1StratumofMesozoicinQingzangPlateau184200012ACTASEDIMENTOLOGICASINICAVol.18No.4Dec.2000©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,(E8891,N32.533.5)2,:,2.1,130m,(150m);(40100m),(30m)(18m),;(1m)(48.45m);2.2,;,3,:,,;,,,,,1,,;,(),()();(),()()4,,(2),4.1,,,,(),6%13%,(),4.2,18O18O610,18O3,18O,:18O618O-2.55,18O-6.23-6.98,3.684.43(6),4.3,,;,,,,,,,565518©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,45.1(),,,,5.2(),,,,(),,(),,5.3(),,,,:+,;+,6()()5(6);()6.1(2)8,72.05m6,62.68m()(),,(3)(),,Ca,Mg/Ca(),,7,,,,,();(),,()2Fig.2FeatureofdolomiteofQuemocuoFormationinNadigangrisection3Fig.3Thediagramofcapillaryconcentrationmodel7554:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.6.2,29,218.66m202.91m(4):,;,,,,(5)(-),,,(5A);,,,,(5B),,;,Mg/Ca,();,()FolkLandMg/Ca8Mg/Ca4Fig.4FeatureofdolomiteofBuquFormationinLongenixisection5Fig.5Thediagramofmixedwatermodel,(),Mg/Ca,;,Mg/Ca,(),;,,(),Mg/Ca(),,,,;,(),;,(),()(),(),774,:(1):,(2):(),;(),(3),,,(4)85518©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.(5),,:(6):,,,(),,(,),1LongmanNW.Carbonatediagenetictexturesfromnearsurfacediage2neticenvironment[J].AAPGBull.1980,64:4614872.[M].:,1994.10.2122243DegensET,EpsteinS.Oxygenandcarbonisotoperatiosincoexistingcalcitesanddolomitesfromrecentandancientsediments[J].Geochim.Cosmochim.Acta1964,28:23444.[M].:,1990.951135GM,JE.[M]...:,1978.1396HsuKJ,SiegenthalerC.Preliminaryexperimentsonhydrodynamicmovementinducedbyevaporationandtheirbearingonthedolomiteproblem[J].Sedimentology,1969,12:11257BathurstRGC.Carbonatesedimentsandtheirdiagenesis,Develop2mentsinsedimentology[M].Els.Publ.Com.1971,12:178RL,LS.:Mg/Ca[A]...1977.10:105136CharacterStudyandAnalysisofDolomiteofMesozoicinQingzangPlateauWANGXing2tao1ZHANGQing2shi2ZHANGJi2ZHOUShu2xin1LIJing2wei31(DaqingPetroleumInstitute,AndaHeilongjiang151400)2(ResearchInstituteofExplorationandDevelopment,DaqingPetroleumAdministrationBureau,DaqingHeilongjiang163212)3(InstituteofGeology,No.5OilProductionPlant,DaqingPetroleumAdministrationBureau,DaqingHeilongjiang163414)AbstractAfterdolomitesofQiangtangBasinandCuoqinBasininQingzangPlateauareobservedanddescribedinthefield,verticalandhorizontaldistributionrulesofdolomiteinthestudyareaarereduced.Applyingstructureindex,cathodeshiningindexandoxygenisotopeindex,genesisofdolomiteareeffectivelyjudgedbyuseofsystematicallyindooranalysisandlaboratorytestmethod.Thenitisconcludedthatdolomitesofthestudyareaareallproducedbymetasomatismordolomitation,notoriginally.Accordingtosizeandshapeofcrystalsandinnerstructureofdolomites,dolomitingphasearedividedintothreephases:quasi-contemporaneousphase,diagenesisandcatagen2esis.Featuresofeachphaseareintroduced.Itisfoundthatdolomitesformedindiagenesiscanbeagoodreservoirrock.Throughselectingtypicalsections,twokindsofgeneticmodelsofdolomiteinthestudyareaareputforward,i.e.capillaryconcentrationmodelandmixedwatermodel.KeywordsQingzangPlateaudolomiteoxygenisotopecathodeshiningmetasomatismdolomitingphasegeneticmodel9554:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.