渤海湾盆地沾化凹陷富林洼陷油气来源及分布规律研究

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1、第35卷第2期石油察劈沾届Vo1．35，No．22013年3月PETROLEUMGEoLoGY&EXPERIMENTMar．，2013文章编号：1001—6112(2013)02—0151-06doi：10．11781／sysydz20130207渤海湾盆地沾化凹陷富林洼陷油气来源及分布规律研究王秀红(中国石化胜利油田分公司地质科学研究院，山东东营257015)摘要：通过对渤海湾盆地沾化凹陷富林洼陷原油的生物标志物分布与组合特征分析，认为该区主要存在3类原油：I类原油主要分布于东次洼，呈植烷优势，伽马蜡烷含量高，重

2、排甾烷与4一甲基甾烷含量较低，来源于东次洼本身的沙四上亚段烃源岩：Ⅱ类原油分布于中次洼洼陷内部，具有姥鲛烷优势、伽马蜡烷含量低、重排甾烷含量高的特征，纵向上不同储层油气来源存在差异，其中浅部储层油气来源于孤南洼陷沙三下亚段烃源岩，深部储层油气主要来自于富林洼陷沙三下亚段烃源岩；Ⅲ类原油分布于中次洼断裂带附近，成熟度较低，姥鲛烷优势，伽马蜡烷含量中等，C甾烷含量丰富，孕甾烷和重排甾烷含量较低，为孤南洼陷沙一段与富林洼陷沙三下亚段烃源岩所形成的混源油。关键词：生物标志物；油气来源；分布规律；富林洼陷；沾化凹陷；渤海湾盆

3、地中图分类号：TEl22．114文献标识码：AHydrocarbonoriginanddistributionregularityinFulinsub-Sag，ZhanhuaSag，BohaiBayBasinWangXiuhong(GeoscienceResearchInstitute，SINOPECShengliOilfieldCompany，Dongying，Shandong257015，China)Abstract：Basedonthestudiesofbiomarkerdistributionandcomp

4、ositionO±crudeoilsintheFulinsub‘SagO±theZhanhuaSagoftheBohaiBayBasin，thereare3typesofcrudeoilinthestudyarea．ThecrudeoilsoftypeImainlyexistintheeastofthesub—sag。characterizedbylowPr／Phratio。highgammaeereneecontentaswellaslowdiasteraneand4-methyl-steranecontents

5、．Theyareoriginatedfromsourcerocksintheuppersubsectionofthe4thmemberoftheShahejieFormationintheeastofthesub—sag．ThecrudeoilsoftypeⅡmainlylocateinthecenterofthesub—sag，featuredbyhighPr／Phratio，lowgammaeereneecontentandhighdiasteranecontent．Theoriginforoilandgasi

6、sdifferentvertically．Hydrocarboninthemiddleandshallowreservoirsismainlyorigi·natedfromsourcerocksinthelowersubsectionofthe3rdmemberoftheShahejieFormationintheGunansub—Sagwhilehydrocarboninthedeepreservoirismainlyoriginatedfromsourcerocksinthelowersubsectionoft

7、he3rdmemberoftheShahejieFormationintheFulinsub．Sag．ThecrudeoilsoftypeIUmainlydistributearoundfaultbeltsinthecentralsub—sag，featuredbylowmaturity，highPr／Phratio，mediumgammaeereneecontent，highC28steranecontentaswellaslowpregnaneanddiasteranecontents，whichshowmix

8、ed—oilcharacteristicsofsourceroeksfromboththe1stmemberoftheShahejieFormationintheGunansub—Sagandthelowersubsectionofthe3rdmemberoftheShahejieFormationintheFulinsub—Sag．Keywords：bio