天然气地球科学

• 天然气地质学 • 上一篇    下一篇

塔里木盆地库车坳陷东部地区下侏罗统储层特征及其主控因素

李国欣1,易士威2,林世国2,高阳2,李明鹏2,李德江2,王昌勇3   

  1. 1.中国石油勘探与生产公司,北京 100011;
    2.中国石油勘探开发研究院天然气地质研究所,河北 廊坊 065007;
    3.成都理工大学沉积地质研究院,四川 成都 610059
  • 收稿日期:2018-07-16 修回日期:2018-09-23 出版日期:2018-10-10
  • 通讯作者: 林世国(1980-),男,辽宁凤城人,高级工程师,博士,主要从事油气勘探规划部署及综合地质研究. E-mail:linshiguo69@petrochina.com.cn.
  • 作者简介:李国欣(1971-),男,山西忻州人,高级工程师,硕士,主要从事勘探管理及综合地质研究.
  • 基金资助:
    国家科技重大专项“大型气田成藏机制、富集规律与勘探新领域”(编号: 2016ZX05007-003)资助.

Reservoir characteristics and major factors influencing the reservoir quality of Lower Jurassic in eastern Kuqa Depression,Tarim Basin

Li Guo-xin 1,Yi Shi-wei 2,Lin Shi-guo 2,Gao Yang2 ,Li Ming-peng 2,Li De-jiang 2,Wang Chang-yong 3   

  1. 1.PetroChina Exploration and Production Corporation,Beijing 100011,China;
    2.PetroChina Research Institute of Exploration and Development,Langfang 065007,China;
    3.Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China
  • Received:2018-07-16 Revised:2018-09-23 Online:2018-10-10

摘要: 塔里木盆地库车坳陷东部地区下侏罗统具有良好的勘探前景,已有勘探成果表明研究区内储层特征差异性较大,储层发育的主控因素亟需研究。主要根据野外露头观测及岩心观察,对库车坳陷东部地区下侏罗统沉积相进行了研究,并结合铸体薄片、扫描电镜、X-射线衍射、镜质体反射率(RO)、孔隙度及渗透率等分析测试成果,对下侏罗统储层岩石学特征、成岩作用特征及储层发育主控因素进行了详细研究。研究表明:库车坳陷东部地区下侏罗统主要发育辫状河及辫状河三角洲沉积,局部发育扇三角洲沉积;储层成分成熟度较低,主要为长石岩屑砂岩及岩屑砂岩,残余原生粒间孔及次生溶孔为主要的储集空间类型,储层总体呈自东向西逐渐变差的趋势;储层先后经历多期成岩作用的影响,其中压实作用和胶结作用对储层伤害最大,溶蚀作用及破裂作用则对储层有明显改善作用;储层目前处于中成岩阶段B期—晚成岩阶段,可划分为溶蚀—原生粒间孔隙相、溶蚀破裂相、碳酸盐致密胶结相及致密压实相4种成岩相,溶蚀—原生粒间孔隙相储层最好,次为溶蚀破裂相储层;储层物性同时受到物源、沉积相及成岩作用的影响和控制,主河道发育区原始粒间孔隙较为发育,而较低的花岗岩岩屑和塑性岩屑含量则有利于粒间孔隙的保存和次生溶孔的形成,研究区东部和中部储层物性相对最好,应作为勘探的重点区域。

关键词: 储层特征, 侏罗系, 阿合组, 阳霞组, 库车坳陷

Abstract: The Lower Jurassic in the eastern area of Kuqa Depression in Tarim Basin has good exploration prospects.The preliminary exploration results show that the reservoir characteristics in the study area are quite different,and the major factors influencing the reservoir quality need to be studied.Based on field outcrop observation and core observation,the Lower Jurassic sedimentary facies in the eastern Kuqa Depression were studied.And combined with the casting thin sections,scanning electron microscopy (SEM),X-ray diffraction,vitrinitereflectance(RO),porosity and permeability analytical results,the Jurassic reservoir petrology characteristics,diagenesis characteristics and the major factors influencing the reservoir quality have been studied in detail.The results show that braided river and braided river delta are mainly developed and fan deltalocally developed in the Lower Jurassic in the eastern Kuqa Depression.Reservoir compositional maturity is low,and it is mainly composed offeldspathic lithic sandstone and lithic sandstone.The main reservoir space is composedof residual original intergranular pores and dissolved pores,and the reservoirshowed a trend of gradual variation from east to west.The reservoir has experienced the influence of multiple diagenesis successively,among which compaction and cementation have the greatest harm to the reservoir,while dissolution and fracture have obvious improvement to the reservoir.At present,the reservoir is in the Mesozoic stage B to late diagenesis stage.The reservoir can be divided into 4 diageneticfacies,including dissolution-primary intergranular pore facies,dissolution burst facies,dense carbonate cementation facies and dense compaction facies.The reservoir of dissolution-primary intergranular pore faciesis the best,and the secondary is dissolution-rupture facies.The reservoir property is affected and controlled by source,sedimentary facies and diagenesis at the same time.The primary intergranular pores are more developed in the main channel development area.The lower content of granite debris and plastic debris is conducive to the preservation of intergranular pores and the formation of secondary dissolved pores.The eastern and central parts of the study area havethe best reservoir property and should be the key area for exploration.

Key words: Reservoir characteristics, Lower Jurassic\Ahe Formation, Yangxia Formation, Kuqa Depression

中图分类号: 

  • TE122.2
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