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ID:37332505
大小:1.61 MB
页数:6页
时间:2019-05-22
《天然气成藏过程中地层水相态变化以鄂尔多斯盆地上古生界为例》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天然乞北第34卷第5期0IL&GASGE0L0GY2013年10月文章编号:0253—9985(2013)05—0640—06doi:10.11743/ogg20130509天然气成藏过程中地层水相态变化以鄂尔多斯盆地上古生界为例张春林,庞雄奇,田世澄。,许化政,张福东,刘锐娥(1.中国石油大学地球科学学院,北京102249;2.中国石油勘探开发研究院廊坊分院,河北廊坊065007;3.巾国地质大学,北京100083)摘要:根据千米桥潜山异常高温气藏的生产特点、气井凝析水的采出机理以及采出水的矿化度特征,认为鄂尔多斯盆地上古生界气藏形成于异常高温阶段。异常
2、高温不仅导致了甲烷的生成,还导致了部分地层水的汽化和异常高压的形成。气(汽)相流体在异常高压推动下向上部地层扩散,运移使下部地层中的压力降低,加速地层水汽化,并积聚新的压力和新一轮的运移,如此反复,逐渐将甲烷、蒸汽水及伴生的温度、压力扩散至封存箱内的每个部位,达到封存箱内的区域势平衡,从而形成盆地级的高温高压气藏。抬升剥蚀导致上古生界温度、压力下降,水蒸气的液化使气藏中的蒸汽水密度降低,甲烷气浓度降低,气柱压力降低,从而形成负压气藏。关键词:相态;封存箱;负压气藏;地层水;上古生界;鄂尔多斯盆地中图分类号:TE132.2文献标识码: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
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