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1、學(xué)兔兔www.xuetutu.com專天然乞北第33卷第2期OIL&GASGE0L0GY2012年4月文章編號(hào)：0253—9985(2012)02—0183—07歧口凹陷古近系天然氣藏主要特征于學(xué)敏，姜文亞，何炳振，王書(shū)香，鄒磊落，汪曉敏(1．中國(guó)石油大港油田公司勘探開(kāi)發(fā)研究院，天津3002802．中國(guó)石油大港油田公司勘探事業(yè)部，天津300280)摘要：歧口凹陷已發(fā)現(xiàn)板橋和千米橋兩個(gè)中型凝析氣田，通過(guò)近兩年的預(yù)探，在埕海潛山和歧口古近系深層天然氣勘探又取得了重要突破，顯示出歧口凹陷天然氣具有良好的勘探前景。從生儲(chǔ)蓋等成藏要素方面對(duì)歧口凹陷古近系天然氣藏進(jìn)行了系統(tǒng)的解剖，明確
2、了歧口凹陷古近系天然氣藏的主要特征。研究表明，歧口凹陷天然氣主要分布在沙河街組中深層，淺層次生氣藏主要位于構(gòu)造圈閉中，中深層氣藏位于構(gòu)造巖性圈閉中；天然氣成因類型以偏腐殖型氣為主；儲(chǔ)層類型以孔隙型為主，中深層裂縫發(fā)育，雙重孔隙介質(zhì)特征明顯；兩套最大湖泛期形成的區(qū)域蓋層發(fā)育異常超壓，天然氣保存條件好；氣藏主要位于高生氣強(qiáng)度區(qū)，以晚期成藏為主，平面上具有“南油北氣”、縱向上具有“上油下氣”的分布特征。關(guān)鍵詞：圈閉；超壓；天然氣；歧口凹陷，黃驊坳陷中圖分類號(hào)：TEl22文獻(xiàn)標(biāo)識(shí)碼：ACharacteristicsofthePaleogenegasreservoirsinQikou
3、SagYuXuemin，JiangWenya，HeBingzhen，WangShuxiang，ZouLeiluoandWangXiaomin(1．Exploration&DevelopmentResearchInstitute，PetroChinaDagangOilfield，Tianjin300280，China；2．ExplorationDepartment，PetroChinaDagangOilfield，Ti~njin300280，China)Abstract：Twocondensategasfields，i．e，BanqiaoandQianmiqiao，haveb
4、eendiscoveredinQikouSag．Inaddi—tion，explorationbreakthroughwasalsomadeintheChenghaiburiedhillandthedeepPaleogeneinQikouSag，in-dicatinggoodexplorationprospect．ThispapersystematicallyanalyzedthePaleogenenaturalgasreservoirsinQikouSagintermsofpetroleumfactorsincludingsourcerocks，reservoirsand
5、caprocks，anddescribedthekeycharacte-risticsofthegasreservoirs．Theresultindicatesthatthenaturalgasmainlyaccumulateinthemid—deepstrataofShah~ieFormation．Theshallowsecondarygasreservoirsmainlyoccurinstructuraltraps．Incontrast，themid—deepgasreservoirsmainlyoccurinstructural-lithologiccompoundt
6、raps．Thegenetictypeofgasisdominatedbyhumustype．Theporespaceofthereservoirisdominatedbypores，withfracturesoccurringinthemid-deeplayers，indica-ringdualporosityreservoir．Tworegionalcaprocksdevelopedduringthemaximumfloodingareoverpressuredandprovidefavorablepreservationconditionforgasreservoir
7、s．Thegasreservoirsmainlyoccurinareaswithhighgasgenerationintensityandarecharacterizedbylatehydrocarboncharging．Thehydrocarbondistributionischaracteri-zedby“gasinthenorthandoilinthesouth’’and“oilintheupperintervalandgasinthelowerinterval”．Keywords：trap，overpres
