岩性油气藏 ›› 2020, Vol. 32 ›› Issue (3): 133–143.doi: 10.12108/yxyqc.20200313

• 油气田开发 • 上一篇    下一篇

Ahdeb油田Khasib油藏孔隙结构及其对注水开发的影响

陈明江, 程亮, 陆涛   

  1. 中国石油川庆钻探工程有限公司 地质勘探开发研究院, 成都 610051
  • 收稿日期:2019-05-20 修回日期:2019-09-04 出版日期:2020-05-21 发布日期:2020-04-30
  • 第一作者:陈明江(1983-),男,博士,高级工程师,主要从事石油地质与测井研究工作。地址:(610051)四川省成都市成华区建设北路一段83号地质勘探开发研究院。Email:19092249@qq.com。
  • 基金资助:
    国家重大科技专项“艾哈代布水平井整体注水稳油控水及综合挖潜技术”（编号：2017ZX05030-001-003）资助

Pore structure characterization and its impact on waterflooding development in Khasib reservoir in Ahdeb Oilfield，Iraq

CHEN Mingjiang, CHENG Liang, LU Tao   

  1. Research Institute of Geological Exploration and Development, Chuanqing Drilling Engineering Co. Ltd., CNPC, Chengdu 610051, China
  • Received:2019-05-20 Revised:2019-09-04 Online:2020-05-21 Published:2020-04-30

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摘要： 伊拉克Ahdeb油田Khasib油藏为中东地区典型的孔隙型碳酸盐岩油藏，具有高孔、低渗、纵向非均质性极强等特征。为快速厘定因储层孔隙结构“多模态”造成水平井网注采过程中含水上升快、水窜现象严重等突出问题，以岩心观察、铸体薄片鉴定、扫描电镜和压汞毛管压力曲线定量分析为手段，以岩相和岩石物理特征为依据将储层划分为24种岩石类型。在此基础上，提取各岩石类型有效喉道半径，并通过测井曲线对比刻画出岩石类型的空间展布，从而实现有效喉道半径的空间展布刻画。研究表明：①Khasib油藏有效喉道半径纵向差异达数十倍，向下呈明显降低趋势；平面上沿构造长轴由东向西降低，垂直构造长轴表现为北高南低的特征；②Khasib2-1-2 L小层为一套平均厚度0.8 m、以粒间孔为主的内碎屑颗粒灰岩，其平均有效喉道半径7.2 μm，平均渗透率高达278.0 mD，远高于相邻小层，为典型的高渗“贼层”；③Khasib2-1-2 L小层在油田范围内分布稳定，是水流优势通道和注水突窜的主控因素；④典型产水特征曲线、生产测井和过路直井电阻率变化均验证了高渗层窜流特征。研究结果为油藏稳油控水提供了可靠措施依据，并据此提出了合理的开发调整措施建议。

关键词: 碳酸盐岩, 岩石类型, 孔隙结构, 高渗层, 注水突窜, Ahdeb油田

Abstract: Khasib reservoir in Ahdeb Oilfield of Iraq is a typical porous carbonate reservoir in the Middle East, and it is characterized by high porosity, low permeability and strong vertical heterogeneity. To understand the causatives for high water cut and rapid breakthrough of injected water in horizontal wells, this paper focused on the three-dimensional characterization of the multi-modal pore structures. Based on core observation, thin section and SEM identification and quantitative analysis of MICP (Mercury Injection Capillary Pressure) curves, 24 rock types were classified in Khasib reservoir according to lithofacies and petrophysical properties. Spatial distribution of the rock types was characterized by well-log correlation, and effective pore-throat radius was extracted from the MICP curves for each rock type. Thus, the three-dimensional distribution of effective pore-throat radius was visualized. The results show that:(1) Effective pore-throat radius ranging from 0.09 μm to 9.2 μm increased upwards and decreased westwards along the long axis of the anticline(from AD1 block to AD4 block).(2) The layer of Khasib2-1-2 L with its average thickness of 0.8 m is a grainstone dominated by interparticle pores,and its average effective pore-throat radius and permeability are 7.2 μm and 278 mD,respectively,which are ten orders of magnitude higher than that of the adjacent layers.(3) The layer of Khasib 2-1-2 L that is referred to as the highpermeability 'thief zone' is a preferential fluid flow passage and is the control factor of rapid breakthrough of injected water.(4) The results were confirmed by typical water control diagnostic plot,production logging as well as resistivity variation observed in vertical wells drilled through the reservoir. The research results provide a reliable basis for oil stabilization and water control in the reservoir,and based on this,reasonable development adjustment measures were proposed.

Key words: carbonate reservoir, rock type, pore structure, high-permeability zone, rapid water breakthrough, Ahdeb Oilfield

中图分类号: 

  • TE122.2
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