塔河地区三叠系主要砂体沉积相类型分析
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摘要
塔河地区三叠系主要为厚层砂岩夹泥岩沉积,砂岩分选性中等-好,颗粒呈次棱角状,成岩矿物以岩屑和石英为主.综合岩心资料、岩石矿物及粒度分析、测井和钻井等资料分析认为,3个油组的厚层砂体主要为辫状河流相沉积,各油组厚层砂体之上的砂泥岩主要为滨浅湖、半深湖-深湖及三角洲相沉积.通过地震资料和测钻井资料分析,研究区南部中油组可识别出湖底扇相和下切水道相.沉积相演化分析表明,湖平面较低时,研究区沉积厚层辫状河流相砂体,湖平面上升时为沉积滨浅湖-半深湖-深湖暗色泥岩和三角洲砂泥岩,研究区三叠系可识别出4次湖平面升降变化,形成4套厚层砂岩夹泥岩的沉积组合(包括柯吐尔组泥岩).
sandstone interbeded with mudstone are mainly present in Triassic System of Tahe area.The sandstone is lithic quartz sandstone with middle to perfect sorting and mineral grains present hypo-edge angle,and rock minerals mainly include cutting and quartz.Based on core data,rock mineral and grain size analysis data,logging and drilling data,the main facies of thick sandstone of three oil-member in study area is braided river.The mudstone and sandstone interbeded in thick sandstone of oil-member are deposited in shore-shallow lacustrine,semi-deep lake to deep lake and delta.Based on seismic data and logging data and drilling data,sublacustrine fan and canyon can be identified in middle oil-member in southern study area.Through the study of facies evolution,braided river sandstone is present during lower lake level,and dark mudstone and sandstone are present in shore-shallow lacustrine,semi-deep lake to deep lake and delta during rising of lake level.Four lake level changes can be identified in Triassic System in study,which form four sets association of thick sandstone and mudstone(including Ketuer formation).
sandstone interbeded with mudstone are mainly present in Triassic System of Tahe area.The sandstone is lithic quartz sandstone with middle to perfect sorting and mineral grains present hypo-edge angle,and rock minerals mainly include cutting and quartz.Based on core data,rock mineral and grain size analysis data,logging and drilling data,the main facies of thick sandstone of three oil-member in study area is braided river.The mudstone and sandstone interbeded in thick sandstone of oil-member are deposited in shore-shallow lacustrine,semi-deep lake to deep lake and delta.Based on seismic data and logging data and drilling data,sublacustrine fan and canyon can be identified in middle oil-member in southern study area.Through the study of facies evolution,braided river sandstone is present during lower lake level,and dark mudstone and sandstone are present in shore-shallow lacustrine,semi-deep lake to deep lake and delta during rising of lake level.Four lake level changes can be identified in Triassic System in study,which form four sets association of thick sandstone and mudstone(including Ketuer formation).
引文
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[2]张希明,刘青芳.塔北地区辫状三角洲沉积特征及油气勘探意义[J].石油勘探与开发,1999,26(1):21-24.
[3]王超,黄智斌,谭泽金.塔里木盆地北部坳陷阿瓦提凹陷三叠系划分对比[J].新疆地质,2008,26(2):133-136.
[4]周玉琦,黎玉战,侯鸿斌.塔里木盆地塔河油田的勘探实践与认识[J].石油实验地质,2001,23(4):363-367.
[5]贾庆素,周庆凡.塔北地区含油气系统[J].石油与天然气地质,2002,23(1):103-106.
[6]郭建华,石媛媛,刘辰生,等.塔里木盆地阿克库勒凸起西缘砂岩储集物性非均质性研究[J].沉积学报,2005,23(3):406.
[7]邵龙义,何志平,顾家裕,等.塔里木盆地古近纪岩相古地理[J].古地理学报,2006,8(3):354-363.
[8]刘辰生,郭建华.新疆阿克库勒地区三叠系中油组层序地层学研究[J].地层学杂志,2008,32(1):41-43.
[9]Van Wagoner,J.C.,Mitchum,R.M.,Campion,K.M.et al.Siliciclasticsequence stratigraphy in well logs,cores and outcrops concepts forhigh-resolution correlation of time and facies[A].AAPG Methods inExploration Series[C].1990,1-55.
[10]Middleton,G.V.,Hampton,M.A.Sediment gravity flow:mechanics offlow and deposition[A].G.V.M.Middleton,A.H.Bouma,eds.,Turbidites and deepwater sedimentation[C].Anaheim:SEPM Pacificsec.Short Course Notes,1973,1-38.
[11]Lowe,D.R.,sediment gravity flows:Ⅱ.Depositional models withspecial reference to the deposits of high-density turbidity currents.Journal of sedimentary petrology,1982,52(1):279-297
[12]陈留勤,段凯波,霍荣.旋回地层学研究现状和新进展[J].新疆地质,2009,27(3):256-258.
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