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ID:37350085
大小:2.04 MB
页数:9页
时间:2019-05-22
《费尔干纳盆地超深层油气成藏系统》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、第36卷第4期石油褒爵他届Vo1.36.No.42014年7月PETR0LEUMGEoLOGY&EXPERIMENTJu1.,2014文章编号:1001-6112(2014)04—0450—09doi:10.11781/yydz201404450费尔干纳盆地超深层油气成藏系统徐洪,杨玉峰(中国石油天然气勘探开发公司,北京100034)摘要:费尔干纳盆地中央地堑带新生界中普遍发育超高压异常。其与构造挤压环境、快速沉降不均衡压实以及持续的生烃作用有关。这种超高压环境对深层油气的生成、聚集成藏产生了重要的影响。主要目的层新近系埋深超过5000
2、m,仍以液态烃产出,深层高孔高渗类砂岩储层是河道砂岩在超高压环境下未经正常压实形成的,表现为取心收获率低、生产过程中易出砂的特征;而低孑L高渗类储层与高压形成的水力破裂裂缝有关。古近系碳酸盐岩储层中高含硫化氢气体来源于TSR反应,TSR作用使含石膏碳酸盐岩储层物性得到了显著的改善.其油层组压力系数稍低于新近系油层组是重烃类气体损耗、储集空间增大两方面因素叠加的结果。中央地堑带主要目的层成藏系统划分为上部E—EN系统和下部JK—E系统;上部高产储层主要受河道砂岩和超高压控制,下部高产层主要受溺湖相的含石膏碳酸盐岩储层控制,2个含油气系统的
3、压力、流体性质均有较大的差别,适宜于分层开采。关键词:异常高压;深层;油气成藏系统;费尔干纳盆地中图分类号:TE122.3文献标识码:AUltra—-deeppetroleumaccumulationsystemsinFerganaBasinXuHong,YangYufeng(ChinaNationalOil—GasExploration&DevelopmentCorporation,Beijing100034,China)Abstract:InthecentralgrabenzoneoftheFerganaBasin,overpres
4、sureswerewidespreadduringCenozoic,whichmightberelatedtotectoniccompressionenvironment,disequilibriumcompactioncausedbyquicksedi—mentationandcontinuoushydrocarbongeneration.Theultra—highpressureenvironmenthadimportanteffectsondeepoilandgasgeneration,migrationandaccumulati
5、on.Themainreservoirswereburiedover5000mdeepinNeogene,andmainlygavebirthtoliquidhydrocarbons.Thehigh—porosityandhigh—permeabilitysandstonereser-voirsindeepformationscamefromfluvialsandstonesunderultra—highpressure,andwerefeaturedbylowcoringrecoveryrateandhighsandproductio
6、n.Thelow—porosityandhigh—permeabilityreservoirswererelatedtohydrau—licfracturescausedbyhighpressure.InthecarbonatereservoirsinPaleogene,H2Swasinhighcontent,mainlygeneratingfromthermochemiealsulfatereduction(TSR),whichobviouslyimprovedthephysicalpropertyofgYP—sumcarbonate
7、reservoirs.TheformationpressurecoeficientwasslightlylowerthanthatofNeogene,whichcouldbeexplainedbyheavyhydrocarbongaslossandreservoirspaceincrease.Themainpetroleumsystemsinthecen-tralgrabenzonecanbedividedintotheupperE—E3NsystemandthelowerJK—E卜2system.High—productionrese
8、rvoirsoftheupperE—E3Npetroleumsystemarecontrolledbychannelsandstonesandoverpressure,whilethoseofthelowe
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