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ID:36720816
大小:5.56 MB
页数:9页
时间:2019-05-14
《渤海海域秦南凹陷油气地质特征及勘探潜力》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、学兔兔www.xuetutu.com中国石油勘探第19卷第5期CHINAPETROLEUMEXPLORATION2014年9月DOI:i0.3969/j.issn.1672—7703.2014.05.003渤海海域秦南凹陷油气地质特征及勘探潜力石文龙李慧勇茆利杨海风陈丽祥于海波(中海石油(中国)有限公司天津分公司)摘要:秦南凹陷是渤海海域勘探程度最低的凹陷之一,前期勘探成果不理想,凹陷的生烃能力一直受到质疑。通过对秦南凹陷油气地质特征研究表明:秦南凹陷内小型次洼已具备较大的生排烃能力,凹陷中心的东洼和中洼烃源岩分布范围更广、体积更大、埋藏更深,应具有更
2、大的生排烃能力;凹陷的结构类型控制油气优势运移方向;稳定分布的东二下段泥岩沉积控制了油气富集层位;长期活动断层的发育位置及程度控制了新近系油气成藏的区域与富集程度,主要发育了自生自储、早生晚储、下生上储近源成藏3种成藏模式。研究认为,石臼坨凸起北侧斜坡区、秦南凸起东侧斜坡区以及秦南I、Ⅱ号断裂附近为有利勘探区域,具有较大勘探潜力。关键词:渤海海域;秦南凹陷;油气地质特征;油气富集;勘探潜力中图分类号:TEl12文献标识码:AHydrocarbonGeologicalCharacteristicsandExplorationPotentialofQinn
3、anDepressioninOffshoreAreaofBohaiSeaShiWenlong,LiHuiyong,MaoLi,YangHaifeng,ChenLixiang,YuHaibo(CNOOC(China)TianjinCompany)Abstract:QinnandepressioniSoneofthedepressionsinoffshoreBohaiBayBasinwhereexplorationmaturityiSthe1owest.Thepreviousexplorationeffectofthedepressionwasnotsat
4、isfactorywithitshydrocarbonsourcingcapacityquestioned.SourcerockismoreextensivelydistributedandmoredeeplyburiedinDongwaandZhongwa,thecentralareasofthedepression,withalargerthickness.Therefore,thecentralpartofthedepressionhasahighercapacityforhydrocarbonsourcingandexpulsion.Thest
5、ructuraltypeofthedepressioncontrolledthedirectionofadvantageousoilandgasmigration.Thesteadily—distributedmudstonedepositofthesecondmemberofDongyingFormationcontrolledtheoilandgasabundance1eve1.Thedevelopmentlocationsanddegreesoflong—termactivefaultscontrolledtheareasandabundance
6、degreesoftheNeogenehydrocarbonaccumulations.Thereweremainlythreeaccumulationpatternsintheregion——theself-sourcingandself-storingpattem,theearly—sourcingandlate—storingpattemandthelower-sourcingandupper-storingnear-sourcepattern.ThestudyindicatesthattheslopezonenorthofShijiutuoup
7、lift,theslopezoneeastofQinnanupliftandtheareasnearQinnanIfaultandQinnanⅡfaultarethefavorableexplorationzoneswithagreatpotentialforexploration.Keywords:offshoreareaofBohai,Qinnandepression,hydrocarbongeologicalcharacteristics,hydrocarbonabundance,explorationpotential对研究区油气成藏模式及其分
8、布规律进行了分析,指出了较为有利的勘探区域。区域地质背景年缝曼tU凹29-2~%1.1构造特征
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