辽中凹陷JZ20A构造油气成藏特征

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1、学兔兔www.xuetutu.com-5天煞气比第33卷第2期0IL＆GASGEOLOGY2012年4月文章编号：0253—9985(2012)02—0174一O9辽中凹陷JZ20一A构造油气成藏特征李建平，郭永华，周东红[中海石油(中国)有限公司天津分公司勘探开发研究院，天津塘沽300452]摘要：辽中凹陷分布有4套烃源岩，东营组二段下亚段、东营组三段、沙河街组一段与沙河街组三段，除东营组二段下亚段多处于未一低熟阶段外均为有效烃源岩。辽中凹陷北洼和自身的沙河街组三段烃源岩为JZ20一A油气田的主要供油区和油气来源。沙河街组三段烃源岩生烃潜力大，有机质丰度和成熟度较高

2、。通过JZ2O—A井主要产层段的包裹体分析，确定了JZ20一A油气田的油气成藏期次，建立了JZ20一A油气田的油气成藏模式。研究结果表明，包裹体均一温度分布于120—140℃。油气的主要充注期在距今5Ma以来明化镇组沉积末期，在东营组沉积时期(约27ma)也有少量的油气充注。JZ20一A各油气藏充注程度高，包裹体GOI值(含油流体包裹体丰度指标)均大于5％。油气成藏表现为接力供烃，高压泥岩双重封堵，油气叠层式成藏的特征。关键词：生物标志化合物；油气充注；成藏模式；成藏特征；辽中凹陷中图分类号：TEl22．1文献标识码：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辽东湾地区位于渤海湾盆地东北部，是