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1、學(xué)兔兔www.xuetutu.com中國石油勘探第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氣地質(zhì)特征及勘探潛力石文龍李慧勇茆利楊海風(fēng)陳麗祥于海波(中海石油(中國)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,凹陷的生烴能力一直受到質(zhì)疑。通過對秦南凹陷油氣地質(zhì)特征研究表明:秦南凹陷內(nèi)小型次洼已具備較大的生排烴能力,凹陷中心的東洼和中洼烴源巖分布范圍更廣、體積更大、埋藏更深,應(yīng)具有更
2、大的生排烴能力;凹陷的結(jié)構(gòu)類型控制油氣優(yōu)勢運(yùn)移方向;穩(wěn)定分布的東二下段泥巖沉積控制了油氣富集層位;長期活動(dòng)斷層的發(fā)育位置及程度控制了新近系油氣成藏的區(qū)域與富集程度,主要發(fā)育了自生自儲(chǔ)、早生晚儲(chǔ)、下生上儲(chǔ)近源成藏3種成藏模式。研究認(rèn)為,石臼坨凸起北側(cè)斜坡區(qū)、秦南凸起東側(cè)斜坡區(qū)以及秦南I、Ⅱ號斷裂附近為有利勘探區(qū)域,具有較大勘探潛力。關(guān)鍵詞:渤海海域;秦南凹陷;油氣地質(zhì)特征;油氣富集;勘探潛力中圖分類號:TEl12文獻(xiàn)標(biāo)識(shí)碼: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對研究區(qū)油氣成藏模式及其分
8、布規(guī)律進(jìn)行了分析,指出了較為有利的勘探區(qū)域。區(qū)域地質(zhì)背景年縫曼tU凹29-2~%1.1構(gòu)造特征