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1、學(xué)兔兔www.xuetutu.com中國(guó)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(guó))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(guò)對(duì)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(shì)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(zhǎng)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(hào)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(hào)：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(duì)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
