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1、學(xué)兔兔www.xuetutu.com天然乞北第34卷第5期0IL&GASGE0L0GY2013年10月文章編號:0253—9985(2013)05—0640—06doi:10.11743/ogg20130509天然氣成藏過程中地層水相態(tài)變化以鄂爾多斯盆地上古生界為例張春林,龐雄奇,田世澄。,許化政,張福東,劉銳娥(1.中國石油大學(xué)地球科學(xué)學(xué)院,北京102249;2.中國石油勘探開發(fā)研究院廊坊分院,河北廊坊065007;3.巾國地質(zhì)大學(xué),北京100083)摘要:根據(jù)千米橋潛山異常高溫氣藏的生產(chǎn)特點(diǎn)、氣井凝析水的采出機(jī)理以及采出水的礦化度特征,認(rèn)為鄂爾多斯盆地上古生界氣藏形成于異常高溫階段。異常
2、高溫不僅導(dǎo)致了甲烷的生成,還導(dǎo)致了部分地層水的汽化和異常高壓的形成。氣(汽)相流體在異常高壓推動下向上部地層擴(kuò)散,運(yùn)移使下部地層中的壓力降低,加速地層水汽化,并積聚新的壓力和新一輪的運(yùn)移,如此反復(fù),逐漸將甲烷、蒸汽水及伴生的溫度、壓力擴(kuò)散至封存箱內(nèi)的每個部位,達(dá)到封存箱內(nèi)的區(qū)域勢平衡,從而形成盆地級的高溫高壓氣藏。抬升剝蝕導(dǎo)致上古生界溫度、壓力下降,水蒸氣的液化使氣藏中的蒸汽水密度降低,甲烷氣濃度降低,氣柱壓力降低,從而形成負(fù)壓氣藏。關(guān)鍵詞:相態(tài);封存箱;負(fù)壓氣藏;地層水;上古生界;鄂爾多斯盆地中圖分類號:TE132.2文獻(xiàn)標(biāo)識碼:APhasestatechangesofformationw
3、ateringasaccumulationprocess:acasestudyfromtheUpperPaleozoic,OrdosBasinZhangChunlin,PangXiongqi,TianShicheng,XuHuazheng,ZhangFudong,LiuRui’e(1.CollegeofGeoscience,ChinaUniversityofPetroleum,Beijing102249,China;2.LanJangBranchofPetroChinaResearchInstituteofPetroleumExplorationandDevelopment,Langfang
4、,Hebei065007,China;3.ChinaUniversityofGeosciences,Bering100083,China)Abstract:Accordingtotheproductioncharacteristicsoftheabnormalhightemperaturegasreservoir,theproducingme—chanismofcondensatewateringaswells,andthesalinitycharacteristicsoftheproducedwaterintheQianmiqiaoburiedhil1.webelievethatthega
5、sreservoiroftheUpperPaleozoicwasformedduringtheabnormalhightemperaturephaseinOrdosBasin.Theabnormalhightemperatureresultedinnotonlythegenerationofmethanebutalsothevaporizationofsomeformationwaterandtheformationofabnormalhighpressure.Thegas(vapor)diffusedupwardunderthedrivingoftheabnormalhighpressur
6、e.Thisgasmigrationledtothedecreasingofpressureinthelowerstrataandthespeedingupofformationwatervaporization.Thevaporizationofformationwatermayinturnincreasethepressureofthelowerstrata,leadingtoanewroundofhydrocarbonmigration.Thisprocessmayrepeatagainandagain,graduallymakingtheme—thane,thevapor,theas
7、sociatedtemperatureandpressuredifiusetothewholecompartmentrealizinglocalbalanceofpo—,tentialfieldinthecompartment,andfinallyresultingintheformationofgasreservoirsofhightemperatureandpressureinthebasin.After