珠江口盆地白云凹陷北坡番禺低隆起天然气成因类型及其烃源探讨

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1、第3O卷第1期石油学报Vo1．3ONo．12009年1月ACTAPETROLEISINICAJan．2009文章编号：0253—2697(2009)01—0016—06珠江口盆地白云凹陷北坡一番禺低隆起天然气成因类型及其烃源探讨何家雄陈胜红刘海龄刘士林(1．中国科学院边缘海地质重点实验室广东广州510640；2．中海石油(中国)有限公司深圳分公司广东广州510240)摘要：珠江口盆地白云凹陷北坡番禺低隆起天然气的成因及其烃源问题，近年来引起了石油地质专家们的广泛关注。在前人工作基础上，根据天然气的组成、碳同位素及其甾萜类生物标志化合物特征，重点对天然气的成因类型及其烃源构成进行了深入

2、分析。依据天然气甲烷碳同位素和乙烷碳同位素分布特征，将天然气成因类型划分为生物气、亚生物气、成熟偏煤型混合气、成熟一高熟偏油型混合气及成熟一高熟煤型气5类。天然气伴生凝析油的甾萜类生物标志物具有富集型煤系有机质和分散型Ⅲ型有机质两种明显不同的特征，由此认为油气主要来自成熟～高熟的渐新统恩平组煤系烃源岩、滨浅湖相烃源岩及始新统文昌组滨浅湖相烃源岩。通过油气地质及油气地球化学综合剖析，指出该区不仅具有巨大的天然气勘探潜力，而且具有石油资源勘探前景。关键词：珠江口盆地；白云凹陷北坡一番禺低隆起；天然气成因类型；古近系；煤系烃源岩；油气勘探前景中图分类号：TE112．111文献标识码：ANa

3、turalgasgenetictypesandsourcerocksinthenorthernslopeofBaiyunSagtoPanyuLowUpliftinPearlRiverMouthBasinHEJiaxiongCHENShenghongLIUHailingIIUShilin(1．KeyLaboratoryforMarginalSeaGeology，ChineseAcademyofSciences，Guangzhou510640，China；2．CNOOCChinaLtd．ShenzhenCompany，Guangzhou510240，China)Abstract：Theg

4、enetictypesofnaturalgasandtheirsourcerockcompositionswerediscussedinthenorthernslopeofBaiyunSagtoPanyuLowUpliftinPearlRiverMouthBasinonthebasisofformerstudies．AccordingtOthestablecarbonisotopeofmethaneandethane，naturalgasinthestudiedareacanbeclassifiedinto5maingenetictypes，includingbiogas，bioth

5、ermal—catalyticgas，maturedmixturecoaliferousgas，maturedtOhighmaturedmixturepetroliferousgasandmaturedtOhighmaturedcoaliferousgas．Steraneandterpanebiomarkersofassociatedcondensateoilinnaturalgashavetwotypesofobviouslydifferentsourcecompositions，whichcamefromorganicmatterbothenrichment～typecoalan

6、dtype—Ildispersedkerogen．So，hydrocarboninthestudiedareaWaSmainlygener—atedfromthematuredtOhighmaturedsourcerockslocatedincoalbedsofOligoceneEnpingFormation．shore—shallow1aeustrinesourcerocksofOligoceneEnpingFormationandEoceneWenchangFormation．Thefurtheranalysesofpetroleumgeologicalandgeo—chemic

7、alcharacteristicsshowthatthisareahasagreatexplorationprospectofnaturalgasandgoodpotentialofpetroleumresource．Keywords：PearlRiverMouthBasin；northernslopeofBaiyunSagtOPanyuLowUplift；naturalgasgenetictypes；Paleocene；coal—bedSOUrCeroc