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1、第43卷第3期中國礦業(yè)大學學報VoI.43NO.32014年5月JournalofChinaUniversityofMining&TechnologyMav2O14東濮老區(qū)文東油田流體包裹體特征及成藏意義梁正中,袁波(1.天津經(jīng)濟技術開發(fā)區(qū)博士后科研工作站,天津300457;2.天津普達軟件技術有限公司,天津300457;3.中國地質(zhì)科學院地質(zhì)力學研究所,北京100081;4.中國石化中原油田分公司勘探開發(fā)科學研究院,河南濮陽457001)摘要:以文東地區(qū)沙三中儲層流體包裹體樣品分析為基礎,對油氣充注史、古溫壓
2、狀態(tài)及成藏效應進行了系統(tǒng)研究,提出晚期超壓成藏對于研究區(qū)油氣藏形成作用顯著,東濮老區(qū)深部勘探重點應放在超壓地層.研究結果表明:區(qū)內(nèi)流體包裹體較為發(fā)育.綜合巖相、熒光觀測顯示有兩期不同成熟度油氣充注.由包裹體測溫法結合埋藏史和熱演化分析、自生伊利石K—Ar法測年確定油氣為兩期成藏,即古近紀末抬升剝蝕期和新近紀末期一第四紀.文東鹽間屬超壓油氣藏,現(xiàn)今原始地層壓力系數(shù)可達1.7~1.9.流體包裹體熱動力學PVTX模擬關鍵成藏期的古壓力系數(shù)大都為1.3~1.4,揭示晚期油氣大規(guī)模充住時為超壓環(huán)境.現(xiàn)場實測資料表明地層壓
3、力增高,儲層含油氣性明顯增加,故東濮老區(qū)深層超壓體系值得進一步研究.關鍵詞:流體包裹體;油氣充注;古壓力;成藏;文東油田中圖分類號:P618.13文獻標志碼:A文章編號:1000—1964(2014)03—0458—06FluidinclusionscharacteristicsofWendongoilfieldinDongpudepressionanditssignificancesonhydrocarbonaccumulationLIANGZhengzhong'~.YUANBo(1.Post—Doctora
4、lResearchCenterofTianjinEconomic—TechnologicalDevelopmentArea,Tianjin300457,China;2.TianjinPudaSoftwareTechnologyLimitedCompany,Tianjin300457,China;3.InstituteofGeomechanics,ChineseAcademyofGeologyScience,Beijing100081,China;4.Exploration8LProductionResearch
5、Institute,ZhongyuanOilfield,SINOPEC,Puyang,Henan457001,China)Abstract:ThisstudywasbasedontheanalysisoffluidinclusionsamplesinthemiddlepartofthethirdmemberofShahejieformationofWendongoilfield,andsystematicallystudiedthehy—drocarboncharginghistory,paleopressur
6、eandpoolformingeffect,andthenproposedthathy—drocarbonaccumulationinthelatestagewasofgreatsignificancetotheoil,gasformationanddeepexplorationshouldfocusonover—pressuredformationsinDongpudepression.Theresultsshowthat:thefluidinclusionsinthisregionhighlydevelop
7、inthereservoir.Combiningwithinclusionpetrographyandfluorescenceobservation,itindicatesthattherearetWOphasesofhydrocarbonchargingwithdifferentmaturedegrees.Bymeansofinclusionthermometry,buri—alorthermalevolutionhistoryanalysis,andautogenicilliteagedating,itsu
8、ggeststhattherearetwohydrocarbonaccumulationperiodsinthestudyarea.Reservoirinsalt—mudinterbedofWendongareaisover—pressuredwithoriginalpressurecoefficientrangingbetween1.7—1.9.Paleopressurewasacq