大港油田埕北断阶区地层水化学特征与油气成藏

《大港油田埕北断阶区地层水化学特征与油气成藏》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名沾专天然气地力第30卷第3期0IL&GASGEOLOGY2009年6月文章编号：0253—9985(2009)03—0268—07大港油田埕北断阶区地层水化学特征与油气成藏张宗峰，查明，高长海(中国石油大学地球资源与信息学院，山东东营257061)‘’““一Na+K>Ca>M阴离子含量摘要：大港油田埕北断阶区古近新近系地层水具有微成水的特征，阳离子含量g，一一-一一C1>HC0>SO>COcI一定程度上控制着总离子量3：；，在。地层水矿化度具有明显的垂向分带性，水型以高矿化度的NaHCO，型为主，在研究区广泛分布。根据地层水矿化度与化学成分的纵向变

2、化，可以划分为正向型、反向型及多向型水化学剖面；反向型和多向型剖面反映地层纵向连通性好，利于油气运移。根据矿化度、离子含量、钠氯系数、脱硫系数等参数的纵向分布3一般位于流体封存箱之，将水化学动力带分为地层水交替流畅带、交替阻滞带和交替迟缓带类。交替迟缓带下，地层水矿化度相对较高，是油气富集的区域。据此，预测张东、张东东地区的古近系沙河街组是油气勘探的有利目标区。关键词：油气运移；油气聚集；油气分布；地层水化学；大港油田中图分类号：TEl22．3文献标识码：AHydrochemicalcharacteristicsandhydrocarbonaccumulationintheChengb

3、eifaultterracezoneofDagangoilfieldZhangZongfengZhaMingGaoChanghai，，olleeoGeo—resourcesandInormationChinaUniversityofPetroleumDoninShatMonhina)(Cgff，，gyg，g257061，CAbstract：ThegroundwaterintheTertiaryChengbeifaultterracezoneintheDagangoilfieldisconsideredtobe’’。’nmildlositiveionsarecharacterizedbN

4、a+K>Ca>Mandthecon—ysalinewater．Thecontentsofpyg．-一一一一tentsofnegativeionsfeatureinC1>HC03>SOi>CO；．TheC1controlsthetotalioncontent．Thesalinityofroundwatershowsobviousverticalzonations．ThehighsalinityNaHC0wateristhemainteanddistributesg3ypwidelarearoundwa—yinthestudy．Accordingtotheverticalchangeofs

5、alinityandchemicalcompositionsofthegterthreetypesofhrochemicalrofilescouldbereconizedincludinositivetereversedteandmulti—，ydpg，gpyp，ypdirectionalte——yp．Thereversedandmultidirectionaltypeprofilesreflectthattheverticalconnectivityisfine，makingitrocarbonmiration—oodforh．Basedontheverticaldistributi

6、onofarameterssuchassalinityoncongydgp，i’一tentNa一C1ratioandcoeficientofdesulfurizationwehavedividedthehrochemiealdnamicalzonesinto，，ydythreetes：theformationwaterexchanesmoothzonetheexchaneretardationzoneandtheexchanedilatori-ypg，ggnesszone．Usuallunderthefluidcomartmentandwithrelativelhihsalinityt

7、heexchangedilatorinesszoneisypyg，consideredrichinoilandas．ThereforewehaveredictedthattheShaheieFormationsintheZhangdonandg，pjgeasternZhangdongareasarefavorableexplorationtargets．Keywords：hydrocarbonmigration；hydrocarbonaccum