地学前缘 ›› 2019, Vol. 26 ›› Issue (4): 238-249.DOI: 10.13745/j.esf.sf.2019.6.2

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柴达木盆地切12区沉积层序及对油气富集的控制作用

刘占国,宫清顺,朱超,王鹏,李积永,伍劲,丁学成,庞旭   

  • 收稿日期:2018-05-14 修回日期:2018-09-12 出版日期:2019-07-25 发布日期:2019-07-25
  • 通讯作者: 宫清顺(1979—),男,硕士研究生,高级工程师,从事沉积储层及油藏地质研究。
  • 作者简介:刘占国(1980—),男,博士研究生,高级工程师,从事沉积储层及石油地质综合研究。
  • 基金资助:
    国家科技重大专项(2017ZX05001-002,2016ZX05003-001-002);中国石油科技重大专项(2016E-01)

Sedimentary sequence and its controlling effect on hydrocarbon enrichment in Qie12 block of Qaidam Basin

LIU Zhanguo,GONG Qingshun,ZHU Chao,WANG Peng,LI Jiyong,WU Jin, DING Xuecheng,PANG Xu   

  1. 1. PetroChina Hangzhou Research Institute of Petroleum Geology, Hangzhou 310023, China
    2. Exploration and Development Institute of Qinghai Oilfield Company, CNPC, Dunhuang 736202, China
    3. Great Wall Drilling Company, CNPC, Beijing 100101, China
  • Received:2018-05-14 Revised:2018-09-12 Online:2019-07-25 Published:2019-07-25
  • Supported by:
     

摘要: 柴达木盆地昆北油田切12区发育厚层砂砾岩油藏。砂砾岩成因类型及分布规律认识不清是制约油藏开发的关键地质因素。综合利用地质、测井、地震及开发动态等资料,在等时层序地层格架内,系统研究砂砾岩的成因类型、分布规律及其对油气富集的控制作用。研究结果表明,切12区下干柴沟组下段发育冲积扇沉积,可划分出辫状水道、泥石流、漫流沉积、径流水道及洪泛平原5种沉积微相类型,可建立“泛连通体”夹间歇性水道、稳定水道形成的叠置分隔复合水道、辫状水道与漫流沉积侧向相间、径流水道镶嵌于洪泛平原泥岩4个沉积构型单元。垂向上,冲积扇整体表现为粒度下粗上细、湖进退积型的沉积序列;平面发育6个冲积扇体,呈由北向南迁移的规律。沉积相带对油气分布具明显控制作用,沉积构型单元控制油气纵向富集,扇体变迁控制油气平面聚集。

 

关键词: 沉积层序, 冲积扇, 砂砾岩油藏, 切12区, 柴达木盆地

Abstract: The thick sandy conglomerate reservoir is developed in Qie12 block of the Kunbei oilfield of Qaidam Basin. The key geological factors restricting reservoir development are the genetic type and distribution law of sandy conglomerate. By comprehensive utilization of geological information, wireline logging data, seismic information and production dynamic data, the genetic type, distribution law of sandy conglomerate and its controlling effect on hydrocarbon enrichment are systematically studied under the control of the isochronal stratigraphic framework. The results shows that alluvial fan facies is developed in the lower part of the Ganchaigou Group in Qie12 block. Five microfacies are identified including braided channel, debris flow, sheet flood, runoff channel and flood plain. Four sedimentary structure units are identified including “pano-connective sand-gravel body” sandwiched intermittent channel, stable channel forming overlapping compound channel, braided channel and lateral sheet flood, and runoff channel inlaid flood plain mudstone. Alluvial fan shows a sedimentary sequence of grain size upward-fining and retrograding sequence vertically and six alluvial fan bodies from north to south are developed on the plane. The sedimentary facies belt has obvious control effect on oil and gas distribution, the sedimentary structure units control the vertical enrichment of oil and gas, and the fan body evolution controls hydrocarbon plane aggregation.

Key words: sedimentary sequence, alluvial fan, sandy conglomerate reservoir, Qie12 block, Qaidam Basin

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