松辽盆地三肇凹陷南部泉头组四段浅水三角洲河道储层构型特征

doi:10.11743/ogg20200308

摘要/Abstract

摘要： 三肇凹陷南部泉四段河道储层主要沉积于缓坡背景下湖泊-浅水三角洲体系，是重要的油气勘探开发层系。利用岩心、测井、地震等资料进行储层构型研究，以Miall提出的构型理论为指导，识别出细砾岩或含泥砾细砂岩、泥岩或粉砂质泥岩两类四级构型界面。根据17种岩相类型，划分了6种构型单元，进一步总结了CH1型、CH2型、CH3型、CH4型4种类型构型单元垂向组合样式。结合4个开发区块，采用复合河道顶拉平方法，刻画4种复合河道构型单元平面组合样式。在井震结合基础上，采用90°相位转换，再统计复合河道主要发育关键位置，针对目的层间提取时频三原色频率属性，进行三肇凹陷南部泉四段储层构型演化研究。研究表明，CH1型为3~7个GB-DA组成垂向加积样式，CH2型为2~5个GB-SL-OF或SB-SL-OF组成侧向加积样式，CH3型为2~4个SB-SL-OF组成侧向加积样式，CH4型为1~3个SB-DA-LS组成垂向加积样式；CH1型与CH4型四级界面水平状向前延伸，CH2型与CH3型四级界面呈现低角度倾斜，延伸较短。Q4-sq1至Q4-sq4沉积时期，随着湖平面不断上升，河道储层构型单元组合样式呈现CH1型—CH2型—CH3型—CH4型转变演化规律。

关键词: 河道, 构型单元, 组合样式, 浅水三角洲, 泉头组, 三肇凹陷南部, 松辽盆地

Abstract: The channel reservoirs in the 4th member of Cretaceous Quantou Formation (Quan 4 member) were mostly deposited in a lake-shallow-water delta system on a gentle slope,and are targets for hydrocarbon exploration and development in southern Sanzhao Sag of Songliao Basin.We study the reservoir architecture via core,logging and seismic data based on Miall's architecture theory,and identify two types of fourth-order architecture interface,namely the interfaces of fine-grained conglomerate or mud pebble-bearing fine sandstone,and of mudstone or silty mudstone.In turn,6 categories of architecture units in accordance are identified according to 17 types of lithofacies assemblages,and 4 vertical combinations of architecture units are defined as Type CH1,Type CH2,Type CH3,and Type CH4 by their contact relations.The 4 lateral combinations of composite channel architecture units are described via flattening on top of the composite channel deposits and well-to-well correlation in four development blocks.Following well-to-seismic tie and 90° phase transformation,we count the key locations of the composite channel growth,and study the architecture evolution of the Quan 4 member reservoirs in southern Sanzhao Sag by extracting volume attribute of time-frequency in three primary color display.The results show that Type CH1 is composed of 3-7 GB-DA in vertical accretion;Type CH2 is composed of 2-5 GB-SL-OF or SB-SL-OF in lateral accretion; Type CH3 is composed of 2-4 SB-SL-OF in lateral accretion; and Type CH4 is composed of 1-3 SB-DA-LS in vertical accretion.The fourth-order architecture interfaces of Types CH1 or CH4 horizontally extend forward,whereas those of Types CH2 or CH3 extend a short distance with low-angle inclination.In addition,from Q4-sq1 to Q4-sq4 periods,the architecture unit assemblages in the channel reservoirs evolve in a pattern of Type CH1 -Type CH2 -Type CH3 -Type CH4 as the lake level keeps rising.

Key words: river channel, architecture unit, assemblage pattern, shallow-water delta, Quantou Formation, southern Sanzhao Sag, Songliao Basin

中图分类号:

TE122.1

邓庆杰,康德江,胡明毅,等. 松辽盆地三肇凹陷南部泉头组四段浅水三角洲河道储层构型特征[J]. 石油与天然气地质, 2020, 41(3): 513-524. doi: 10.11743/ogg20200308 Deng Qingjie,Kang Dejiang,Hu Mingyi,et al. Architecture of channel reservoirs of shallow-water delta in the 4th member of Cretaceous Quantou Formation in southern Sanzhao Sag,Songliao Basin[J]. Oil & Gas Geology, 2020, 41(3): 513-524. doi: 10.11743/ogg20200308

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