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ID:36741230
大小:1.93 MB
页数:7页
时间:2019-05-14
《歧口凹陷古近系天然气藏主要特征》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专天然乞北第33卷第2期OIL&GASGE0L0GY2012年4月文章编号:0253—9985(2012)02—0183—07歧口凹陷古近系天然气藏主要特征于学敏,姜文亚,何炳振,王书香,邹磊落,汪晓敏(1.中国石油大港油田公司勘探开发研究院,天津3002802.中国石油大港油田公司勘探事业部,天津300280)摘要:歧口凹陷已发现板桥和千米桥两个中型凝析气田,通过近两年的预探,在埕海潜山和歧口古近系深层天然气勘探又取得了重要突破,显示出歧口凹陷天然气具有良好的勘探前景。从生储盖等成藏要素方面对歧口凹陷古近系天然气藏进行了系统的解剖,明确
2、了歧口凹陷古近系天然气藏的主要特征。研究表明,歧口凹陷天然气主要分布在沙河街组中深层,浅层次生气藏主要位于构造圈闭中,中深层气藏位于构造岩性圈闭中;天然气成因类型以偏腐殖型气为主;储层类型以孔隙型为主,中深层裂缝发育,双重孔隙介质特征明显;两套最大湖泛期形成的区域盖层发育异常超压,天然气保存条件好;气藏主要位于高生气强度区,以晚期成藏为主,平面上具有“南油北气”、纵向上具有“上油下气”的分布特征。关键词:圈闭;超压;天然气;歧口凹陷,黄骅坳陷中图分类号:TEl22文献标识码: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
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