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1、學(xué)兔兔www.xuetutu.com-5天煞氣比第33卷第2期0IL&GASGEOLOGY2012年4月文章編號:0253—9985(2012)02—0174一O9遼中凹陷JZ20一A構(gòu)造油氣成藏特征李建平,郭永華,周東紅[中海石油(中國)有限公司天津分公司勘探開發(fā)研究院,天津塘沽300452]摘要:遼中凹陷分布有4套烴源巖,東營組二段下亞段、東營組三段、沙河街組一段與沙河街組三段,除東營組二段下亞段多處于未一低熟階段外均為有效烴源巖。遼中凹陷北洼和自身的沙河街組三段烴源巖為JZ20一A油氣田的主要供油區(qū)和油氣來源。沙河街組三段烴源巖生烴潛力大,有機質(zhì)豐度和成熟度較高
2、。通過JZ2O—A井主要產(chǎn)層段的包裹體分析,確定了JZ20一A油氣田的油氣成藏期次,建立了JZ20一A油氣田的油氣成藏模式。研究結(jié)果表明,包裹體均一溫度分布于120—140℃。油氣的主要充注期在距今5Ma以來明化鎮(zhèn)組沉積末期,在東營組沉積時期(約27ma)也有少量的油氣充注。JZ20一A各油氣藏充注程度高,包裹體GOI值(含油流體包裹體豐度指標)均大于5%。油氣成藏表現(xiàn)為接力供烴,高壓泥巖雙重封堵,油氣疊層式成藏的特征。關(guān)鍵詞:生物標志化合物;油氣充注;成藏模式;成藏特征;遼中凹陷中圖分類號:TEl22.1文獻標識碼:ACharacteristicsofhydroca
3、rbonaccumulationinJZ20-AstructureinLiaozhongSagLiJianping,GuoYonghuaandZhouDonghong(ExplorationandProductionResearchInstitute,CNOOCTianjinCompany,Tianjin300452,China)Abstract:Thelower2“memberand3memberoftheDongyingFormation,the1and3memberoftheSha—hejieFormationarefoursourcerocksinLiaozh
4、ongSag.Thelatterthreeareactivesourcerocks.butthelower2memberoftheDongyingFormationisimmaturetolowlymature.The3memberoftheShah~ieFormationinthenorthernsubsagoftheLiaozhongSagiSthemainsourcerocksfortheJZ20.Aoilfield.Thesourcerocksinthe3memberoftheShahejieFormationareofhighorganiccontentan
5、dmaturity,thushavegreatpotentialforhydro-carbongeneration.ByanalyzingtheinclusionofthemajorpayzonesinthewellJZ20一A,weperformedthetimingofthehydrocarbongenerationandestablishedthehydrocarbonaccumulationmodelintheJZ20-Aoilfield.Theresultsindicatethatthehomogenizationtemperatureoftheinclus
6、ionis120—140℃.Thehydrocarbonchargingmainlyoccurredat5MaagowhentheMinghuazhenFormtionwasdeposited.Hydrocarbonchargingalsohap—penedat27MaagowhentheDongyingFormationdeposited.AllthereservoirsofJZ2O—Aoilfieldarehighinhy-drocarbonabundance.TheGOIvalueoftheinclusionisabove5%.Thecharacteristic
7、softhehydrocarbonaccu—mulationarerelay-typemultiplestagehydrocarboncharging,over—pressuredshalesealingonbothsidesandoiL/gasaccumulationinsuperimposedmultiplelayers.Keywords:biomarker,hydrocarboncharging,accumulationmodel,accumulationcharacteristics,LiaozhongSag遼東灣地區(qū)位于渤海灣盆地東北部,是