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时间:2020-04-25
《南黄海盆地北部坳陷北凹油气成藏特征的再认识-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第3期海浮占Vl01.34NO.32014年9月OFFSHOREOILSep.2014文章编号:1008—2336(2014)03—0040-06南黄海盆地北部坳陷北凹油气成藏特征的再认识王存武,赵志刚,王鹏,张功成,梁建设,郭瑞(中海油研究总院,北京100027)摘要南黄海盆地北部坳陷北凹是一个大中型的中、新生代沉积凹陷,经过四十余年的油气勘探,至今仍无商业油气发现,仅发现诸城1.2一个含油气构造。北凹的油气勘探存在诸多问题,其中是否发育优质烃源岩、烃源岩能否生烃、油气是否运移至储层是关系到北凹油气
2、勘探的基础地质问题。在对北凹主要烃源岩分析评价的基础上,采用流体包裹体系统分析技术,对北凹油气成藏特征展开研究。研究认为,北凹存在白垩系泰二段主力烃源岩,为中深湖相,生烃指标较好,分布面积较大,且现今已经成熟并排烃,生烃中心位于zC.A井区。油气通过断裂发生垂向运移,已充注至始新统戴南组储层。流体包裹体荧光观察结果及显微测温结果均表明戴南组至少存在两期油充注,第一期发生在35Ma左右,第二期为现今。关键词:南黄海盆地;成藏特征;流体包裹体中图分类号:TEl22-3文献标识码:ADOI:10.3969~.iss
3、n.1008—2336.2014.03.040NewViewonHydrocarbonAccumulationCharacteristicsoftheNorthSag,NorthDepressionoftheSouthYellowSeaBasinWANGCunwu,ZHAOZhigang,WANGPeng,ZHANGGongcheng,LIANGJianshe,GUORui(CNOOCResearchInstitute,Beijing100027,China)Abstract:TheSouthYellowSe
4、abasinisalargesizeMesozoicandCenozoicsedimentarybasin.Hydrocarbonexplorationinthisbasinhasbeencarriedoutformorethanfourdecades,butnocommercialhydrocarbondiscoveryhasbeenobtainedSOfar,withonlyoneoilbearingstructureZhucheng1-2hasbeendiscovered.Therearealotofb
5、asicgeologicalproblemstobesolvedinthisbasin,includingwhethertheexcellentqualitysourcerocksarewelldeveloped,whetherhydrocarbonhasbeengeneratedfromthesourcerocks,andwhetherhydrocarbonscanmigrateintoreservoirs.Basedonevaluationresultsonsourcerocks,thehydrocarb
6、onaccumu—lationcharacteristicsintheNorthSaghavebeenstudiedwithfluidinclusiontechniqueinthisPaDer.Theresultshowedthatthesec—ondmemberofTaizhouformationiSthemainsourcerock.beingsemi—deeplacustrinefacies。anddistributeswidely.Themainsourcerockshavematureandlarg
7、eamountofoilandgashavebeenexpulsedfromthemainsourcerocks.Thehydrocarbongenerationcenterwas1ocatedinW_e11BlockZC.A.HydrocarbonhasmigratedalongfaultsandfilledintotheEoceneDainanFormation.Theresultsshowthatthereweretwophasesofhydrocarbonchargeat1eastintheDaina
8、nformationbasedonthestudyresultsoffluores—cenceobservationoffluidinclusionandthemicroscopictemperaturemeasure.Thefirstphasehydrocarbonchargehappenedinabout35Ma,andthesecondchargehappenedatpresent.Keywo
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