川东北巴中—通南巴地区须家河组致密砂岩储层裂缝发育特征及控制因素
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

本文为国家科技重大专项“四川盆地碎屑岩层系油气富集规律与勘探评价”项目(编号 2016ZX05002004)资助成果。


Characteristics and controlling factors of tight sandstone reservoir fractures of the Xujiahe Formation in the Bazhong- Tongnanba area, Northeast Sichuan
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    以岩芯及野外观察、分析测试、测井等资料为基础,分析了川东北巴中—通南巴地区致密砂岩储层裂缝的类型及成因,结合裂缝充填矿物包裹体分析,厘定裂缝形成期次。在此基础上,探讨了岩性组合、岩层厚度、断层、褶皱变形强度对裂缝发育的控制作用。研究表明:研究区须家河组裂缝具有多成因、多期次、差异分布的特点。主要发育构造裂缝,且主要分布于致密砂岩储层中,可划分为3期:燕山中期(中侏罗世)的NNW和NWW向共轭构造缝,被细粒方解石充填;燕山晚期(白垩纪)的NE向断层、褶皱伴生高角度缝,被粗粒方解石或石英充填;喜马拉雅期(古近纪)的NW和近SN向断层伴生缝,被粗粒方解石半充填或未充填。成岩裂缝和超压裂缝的成因与黏土矿物失水收缩及烃源岩大量生烃引起的流体增压有关,主要形成时间为晚侏罗世—早白垩世。裂缝发育的差异性主要受控于岩性组合、地层厚度、断层及褶皱变形强度,单层厚度小、距断层距离近、褶皱变形强度大的中、细砂岩储层,裂缝最为发育。

    Abstract:

    The types and the causes of fractures in the Xujiahe Formation tight sandstone reservoir, in the BazhongTongnanba area of northeastern Sichuan basin, were studied based on the core and outcrop observations, analysis and testing, loggings and other data which was combined with inclusion analysis to identify the fracture formation stages. Based on this, the relative control of lithology combination, stratum thickness, fault and fold deformation strength on fracture development is discussed. The results show that the fractures of the Xujiahe Formation in the northeastern Sichuan Basin were triggered by various causes, formed in multiple stages, and show differential distribution. Tectonic fractures, mainly developed and distributed in tight sandstone reservoirs, can be divided into 3 stages: the NNW and NWW directional tectonic fractures in the middle Yanshanian (Middle Jurassic), and filled by finegrained calcite; the NE trending fractures associated with fault and fold were formed in the late period of Yanshan movement and were filled with quartz and coarse calcite; and the NW and SN trending fractures associated with fault were formed in the early period of Himalaya tectonic movement, and are either empty or partially filled with coarse grained calcite. The diagenetic fractures and overpressure fractures are related either to water shrinkage of clay minerals or the fluid pressurization caused by massive hydrocarbon generation in source rocks and formed in Late JurassicEarly Cretaceous. The development of fractures is mainly affected by lithology combination, stratum thickness, fault and fold deformation strength. The middle and fine sandstone reservoirs with small stratum thickness, closer location to fault, and greater strength of fold deformation have developed more fractures.

    参考文献
    相似文献
    引证文献
引用本文

蒋有录,李明阳,王良军,刘景东,曾韬,赵承锦.2020.川东北巴中—通南巴地区须家河组致密砂岩储层裂缝发育特征及控制因素[J].地质学报,94(5):1525-1537.
JIANG Youlu, LI Mingyang, WANG Liangjun, LIU Jingdong, ZENG Tao, ZHAO Chengjin.2020. Characteristics and controlling factors of tight sandstone reservoir fractures of the Xujiahe Formation in the Bazhong- Tongnanba area, Northeast Sichuan[J]. Acta Geologica Sinica,94(5):1525-1537.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-10-11
  • 最后修改日期:2020-03-19
  • 录用日期:2020-03-25
  • 在线发布日期: 2020-04-27
  • 出版日期: