油气藏评价与开发 ›› 2021, Vol. 11 ›› Issue (5): 703-708.doi: 10.13809/j.cnki.cn32-1825/te.2021.05.006

• 海上油气勘探与开发 • 上一篇    下一篇

渤海海域B构造特低渗—低渗储层酸敏性评价

孙藏军(),黄磊,吴浩君,姜永,王迪   

  1. 中海石油(中国)有限公司天津分公司渤海石油研究院,天津300459
  • 收稿日期:2020-04-26 出版日期:2021-10-26 发布日期:2021-10-12
  • 作者简介:孙藏军(1988—),男,硕士,工程师,主要从事海上油气田开发地质研究工作。地址:天津市滨海新区海川路2121号渤海石油管理局大厦B座,邮政编码:300459。E-mail: suncj2@cnooc.com.cn
  • 基金资助:
    国家科技重大专项“渤海海域勘探新领域及关键技术研究”(2016ZX05024-003)

Acid sensitivity evaluation of ultra-low permeability reservoir in structure-B of Bohai Bay

SUN Cangjun(),HUANG Lei,WU Haojun,JIANG Yong,WANG Di   

  1. Bohai Petroleum Institute of Tianjin Branch of CNOOC Ltd, Tianjin 300459,China
  • Received:2020-04-26 Online:2021-10-26 Published:2021-10-12

摘要:

针对渤海B构造特低渗—低渗储层,开展酸敏性实验评价。结合铸体薄片、扫描电镜、核磁共振,X-衍射等分析化验资料,对酸岩反应前后岩石样品孔隙结构变化及其原因进行了分析,并探讨了土酸酸化储层的适用性。结果表明:研究区砂砾岩和片麻岩储层与土酸(7.2 %HCl+3 %HF)反应后,储层基本无伤害。酸岩后应后,研究区储层样品微孔隙发育,长石颗粒溶蚀孔发育,未见碳酸盐等易溶矿物,有效面孔率均增大,大、小孔隙数据增多,T2截止值和束缚水饱和度均变小,孔隙结构变好;砂砾岩碎屑颗粒间仍呈线状—凹凸状接触,片麻岩储层矿物变晶仍呈粒状紧密接触,储层骨架稳定性仍较好。易溶型碳酸盐胶结物酸化溶蚀后,是造成储层孔隙结构变好的关键因素,因酸敏矿物绿泥石而产生的二次沉淀和不溶微粒堵塞孔喉对储层损害程度也较小。土酸与研究区储层反应后,孔隙结构得到改善,对改善储层渗透率具有一定的作用。

关键词: 特低渗—低渗;, 酸敏性, 微观孔隙结构, B构造, 渤海海域

Abstract:

The acid sensitivity test has been carried out to evaluate the ultra-low permeability reservoir in structure-B of Bohai Bay. Combined with the analysis and test data such as casting thin sections, scanning electron microscope, nuclear magnetic resonance and X-ray diffraction, the reason of rock pore structure changes before and after the acid-rock reaction has been analyzed, and the applicability of the mud acid acidizing reservoir has been discussed. The results showed that the reservoirs of the glutenite and gneiss in the study area are basically unharmed after reacting with the soil acid(7.2 %HCl+3 %HF). After the acid-rock reaction of the samples in the study area, the micropores and the dissolution pores of feldspar particles develop, no carbonate or other soluble minerals are found, the effective face rate and data of large and small pores increase, the cut-off value of T2 spectrum and irreducible water saturation decrease, and the pore structure become better. Meanwhile, the clastic grains of the glutenite are still in linear-convexity contact, the mineral metamorphic grains of gneisses reservoir are still in granular close contact, and the reservoir framework is still stable. The acidifi cation and dissolution of soluble carbonate cement is the key factor to change the pore structure of reservoir in the study area. Secondary precipitation caused by acid-sensitive mineral chlorite and blockage of pore throat by insoluble particles have little damage to the reservoir. After the reaction of soil acid with the reservoir in the study area, the pore structure is improved, showing a constructive role, which has a certain applicability to improve the reservoir permeability.

Key words: ultra low-low permeability, acid sensitivity, microscopic pore structure, structure-B, Bohai Bay

中图分类号: 

  • TE51