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1、2007年第31卷中国石油大学学报(自然科学版)Vo.l31No.2第2期JournalofChinaUniversityofPetroleumApr.2007文章编号:1673-5005(2007)02-0013-06二连盆地异常低压成因机理探讨111123许晓明,刘震,肖伟,郝琦,赵贤正,杨德相(1.中国石油大学石油天然气成藏机理教育部重点实验室,北京102249;2.中国石油天然气股份有限公司勘探与生产分公司,北京100011;3.华北油田分公司勘探开发研究院,河北任丘062552)摘要:二连
2、盆地主要凹陷的压力场基本上都呈现为异常低压特征,地层压力系数大多小于1.0,但用现有的异常低压成因机理来解释二连盆地的异常低压却遇到了困难,为此将该区异常低压埋藏史曲线与异常高压盆地(渤海湾盆地和莺歌海盆地)的埋藏史曲线进行了对比。结果表明,二连盆地在晚白垩世具有长达50～60Ma的沉积停滞期,长时期的沉积停滞可能是二连盆地异常低压的主要原因。沉积停滞条件下既不会出现欠压实现象,也无法产生异常高压,但却造成地层具有较高的压实程度,使得后来再次沉积深埋时,压实作用受阻,上覆负荷过多地加载在了岩石骨架上
3、,流体压力相对变小,形成异常低压。关键词:二连盆地;异常低压;成因机理;沉积停滞中图分类号:TE121.31文献标识码:AInvestigationongeneticmechanismofsubnormalpressureinErlianBasin111123XUXiao-ming,LIUZhen,XIAOWei,HAOQi,ZHAOXian-zheng,YANGDe-xiang(1.KeyLaboratoryforHydrocarbonAccumulation,MinistryofEducatio
4、n,ChinaUniversityofPetroleum,Beijing102249,China;2.ExplorationandProductionBranchCompany,PetroChina,Beijing100011,China;3.ResearchInstituteofPetroleumExplorationandDevelopment,HuabeiOilfieldBranchCompany,Renqiu062552,HebeiProvince,China)Abstract:Thepre
5、ssurefieldofthesagsinErlianBasinshowscharactersofbasicallysubnormalpressure,andthepressurecoefficientsaremostlessthan1.AnditisdifficultytointerpretthegeneticmechanismsofsubnormalpressureofErlianBasinwithconventionalgeneticmechanisms.Comparedwiththeburi
6、alhistoryofthebasinsofYinggehaiBasinandBohaiBayBa-sinwhichdominatedwithoverpressure,itisfoundthatErlianBasinunderwentalongdepositionalstagnancystagethatalmostextends50～60MainlaterCretaceous,andthismaybethekeyfactorthatleadstopresentlysubnormalpressuree
7、nviron-men.tUnderdepositionalstagnancystage,neitherundercompactionnoroverpressurecanbegenerated,butthesubsurfacestratusexperiencecontinuouscompactionwhichpreventsthesubsequentcompactioncausedbytheoverloadingprocessinthefollowingsedimentaryperiods.Inthe
8、followingsedimentaryprocess,becausetheoverburdenmainlyexertsonthematrixoftherockandthepressureoftheinnercontainedfluidisconcealedout,thesubnormalpressureisformed.Keywords:ErlianBasin;subnormalpressure;geneticmechanism;depositionalstagna
