石油学报 ›› 2008, Vol. 29 ›› Issue (4): 588-591.DOI: 10.7623/syxb200804021

• 油田开发 • 上一篇    下一篇

鄂尔多斯盆地中部长6和长8储层特征及酸敏机理

柳娜1, 南珺祥1, 刘伟2   

  1. 1. 中国石油长庆油田勘探开发研究院, 陕西西安, 710021;
    2. 川庆钻探工程公司长庆油田工程技术研究院, 陕西西安, 710021
  • 收稿日期:2007-11-13 修回日期:2008-01-29 出版日期:2008-07-25 发布日期:2010-05-21
  • 作者简介:柳娜,女,1979年8月生,2006年获中南大学理学硕士学位,现为长庆油田勘探开发研究院助理工程师,主要从事油气勘探开发研究工作.E-mail:liunl_cq@petrochina.com.cn
  • 基金资助:
    国家重点基础研究发展规划(973)项目(2003CB214607)资助.

Reservoir characteristics and acid sensitivity mechanism of Chang 6 and Chang 8 reservoirs in the central of Ordos Basin

LIU Na1, NAN Junxiang1, LIU Wei2   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710021, China;
    2. Changqing Engineering Technology Institute, PetroChina Chuanqing Drilling and Exploration Corporation, Xi'an 710021, China
  • Received:2007-11-13 Revised:2008-01-29 Online:2008-07-25 Published:2010-05-21

摘要: 运用铸体薄片、X衍射、扫描电镜、能谱、等离子发射光谱仪等分析测试技术,对鄂尔多斯盆地中生界延长组湖盆中部长6和长8储层酸敏特征及机理进行分析的结果表明,长6和长8储层的敏感性为改善-弱酸敏性.绿泥石膜的溶蚀作用是造成改善型储层的主要原因;绿泥石与盐酸的反应过程中,反应残余的绿泥石晶片堵塞喉道,这是形成弱酸敏型储层的主要原因.对酸敏残液分析结果表明,在一定时间内不可能形成Fe(OH)3沉淀及堵塞喉道.因而,在储层酸化过程中应注入足量的酸化液,使残余物发生完全反应.但酸化液不宜在地层中滞留时间太长,否则易形成沉淀,从而降低渗透率.

关键词: 鄂尔多斯盆地, 储层特征, 酸敏机理, 绿泥石, 酸化工艺, 酸化液

Abstract: The reservoir characteristics and acid sensitivity mechanism of Chang 6 and Chang 8 reservoirs in the Mesozoic Yanchang Formation of Ordos Basin were analyzed by using some methods such as casting body slice image analysis,XRD,SEM,EEDS and ICP-AES.The results showed that there was amendatory-weak damage resulted from acid sensitivity in Chang 6 and Chang 8 reservoirs.The corrosion of chlorite membrane resulted in the evident improvement of microscopic pore structures.In the reaction process of chlorite with hydrochloric acid,remnant chlorite fell off from the wall of pores and jammed the throat,which is the main reason for weak sensitivity of the reservoirs in these regions.The sensitivity test showed that the remnant chlorite was impossible to form Fe(OH)3 precipitation in the simulative system.In the fracturing process,the adequate standard acidizing fluids should be injected into fractured wells in order to ensure the complete reaction of chlorite.The standard acidizing fluids only stay short time to avoid increment of acid value of fluid and forming precipitation.

Key words: Ordos Basin, reservoir characteristics, acid sensitivity mechanism, chlorite, reservoir acidization, acidizing fluid

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