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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.