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1、學兔兔www.xuetutu.com專天然乞北第33卷第2期OIL&GASGE0L0GY2012年4月文章編號:0253—9985(2012)02—0183—07歧口凹陷古近系天然氣藏主要特征于學敏,姜文亞,何炳振,王書香,鄒磊落,汪曉敏(1.中國石油大港油田公司勘探開發(fā)研究院,天津3002802.中國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)板橋和千米橋兩個中型凝析氣田,通過近兩年的預(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。從生儲蓋等成藏要素方面對歧口凹陷古近系天然氣藏進行了系統(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:TEl22文獻標識碼: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