104矿 物 岩 石2008

1987,41:3012333.

[13]AlexanderR,KagiR,WoodhouseGW,etal.Identificationofthebicyclicsequiterpenes,drimane,andeudesmaneinpetroleum[J].Journal

ofthechemicalsociety,chemicalcommunications,1983,2262228.

[14]TissotBP,WelteDH.PetroleumFormationandOccurrence(2ndEdition)[M].Berlin:Spring2Verlag,1984.[15]张枝焕,关 强.新疆三塘湖盆地二叠系油源分析[J].石油实验地质,1998,20(2):1742181.

THEGEOCHEMICALCHARACTERISTICSANDORIGINOFSOLIDBITUMENFROMVOLCANICROCKRESERVOIROF

YINGCHENGFORMATIONINCHANGLINGFAULTEDDEPRESSION

QINLi2ming1, ZHANGZhi2huan1, WUYi2yuan2,

111

YANGYong2cai, LIUhong2jun, ZANLing

1.KeyLaboratoryforHydrocarbonAccumulation,ChinaUniversityofPetroleum,

MinistryofEducation,Beijing 102249,China;

2.ResearchInstituteofPetroleum,EastChinaBureauofPetroleum,SINOPEC,

Nanjing 225000,China

Abstract: Changlingfaulteddepressionisacontinentalvolcanicrockbasinwheretheaccumula2tionconditionsofnaturalgasisfavorablewiththeforegroundofgasreservoirexplorationprefera2ble.Onthebasisofmeasurementandanalysisofvolcanicrocks,saturateandaromatichydrocar2bons,theresources,stagesandoriginofsolidbitumenarestudied.Itisshowedthatthesolidbitu2menischaracterizedbynon2fluorescentandirregularshapefilledinthefracturesofrocks.Thedistributionofnormalparaffinhydrocarbonsisperformedbysinglepeakedshape,nC21-/nC22+>1,nonobviousodd/evenpredominance,suggestingthatthematurityofsolidbitumenishigher.AlsothePr/Ph<1,therelativelylowerabundanceofB2carotane,pregnaneandhomopregnane,andlowerratiosofgammacerane/C30hopanesreflectthatthesolidbitumenisgeneratedinare2ductionandbrackishlacustrineenvironment.Accordingtotheallocationandcompositionofster2anesandterpanesinsaturatedhydrocarbon,itisthoughtthatthesolidbitumenisoriginatedfromordinaryaquaticorganismsprimarilywithminorcontributionofhigherplants.Thehomogeniza2tiontemperaturefromsaltedfluidinclusionsisfrom126eto130eand146eto160e,corre2spondingtosedimentaryperiodofNenjiangFormation,representingthefillingstageofsolidbitu2men.Accordingtothecharateristicsofbiomarkersandnaturalgasgeochemistry,solidbitumenisprimarilycrackedbyoilsderivedfromtheYingchengFormation,andundergonegasdeasphaltingprocessinthelatestage.

Keywords: volcanicrockreservoir;YingchengFormationg;solidbitumen;analysisoforigin;Changlingfaulteddepression

ISSN1001-6872(2008)03-0096-09; CODEN:KUYAE2

Synopsisofthefirstauthor: QinLiming,male,24yearsold,adoctoralstudentofgeochemistry.Nowheisengagedintheresearchoforganicgeochemistry.