西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

低渗火山岩气藏可动流体百分数及其影响因素

廖作才1,2,孙军昌3,杨正明2,3,熊生春3,何英3   

  1. 1. 克拉玛依职业技术学院,新疆克拉玛依833600;2. 中国科学院渗流流体力学研究所,河北廊坊065007;
    3. 中国石油勘探开发研究院廊坊分院,河北廊坊065007
  • 出版日期:2014-02-01 发布日期:2014-02-01
  • 基金资助:

    国家油气重大专项“特低渗透油藏有效开发技术”(2011ZX05013–006)。

Study on the Movable Fluid Saturation and its Influencing Factors of
Low Permeability Volcanic Gas Reservoir

Liao Zuocai1,2, Sun Junchang3, Yang Zhengming2,3, Xiong Shengchun3, He Ying3   

  1. 1. Karamay Vocational & Technical Institute,Karamay,Xinjiang 833600,China
    2. Institute of Porous Flow and Flow Mechanics,Chinese Academy of Sciences,Langfang,Hebei 065007,China
    3. Research Institute of Petroleum Exploration and Development–Langfang,Langfang,Hebei 065007,China
  • Online:2014-02-01 Published:2014-02-01

摘要:

针对火山岩储层成岩机制与常规沉积储层差异大、岩性种类繁多、储层孔隙结构复杂等特点,综合使用离心
实验、核磁共振、恒速压汞及CT 成像等实验技术,对大庆徐深、吉林长岭和新疆滴西3 个火山岩气田可动流体百分数
及其影响因素进行了对比研究。实验结果表明,气水离心标定低渗致密火山岩气藏可动流体百分数使用的离心力应
为2.76 MPa,不同渗透率级别火山岩储层可动流体微观分布规律具有明显差异,渗透率越大,较大喉道控制的可动流
体比例越大,气藏开发难度越小,渗透率越小,较大喉道控制可动流体比例越小,0.100 mD 是可动流体微观分布规律
发生明显变化的临界渗透率。108 块岩芯可动流体百分数平均值为23.62%,长岭气田可动流体百分数最大,滴西气田
可动流体百分数最小。CT 成像与恒速压汞实验结果表明,孔喉大小及其匹配关系和裂缝发育程度是影响火山岩储层
可动流体百分数大小的主要因素。

关键词: 低渗火山岩气藏, 可动流体百分数, 离心实验, 核磁共振, 裂缝

Abstract:

In view of the factors that the diagenetic mechanism of volcanic reservoir is different from the conventional depositional
sandstone reservoir,the micro-pore structure of the volcanic is more complex than that of sandstone reservoir. The movable
fluid saturation of Xushen,Changling and Dixi volcanic gas reservoirs were systematically studied by using the centrifugal
experiment,NMR,constant-rate mercury injection and CT technology. The experimental results indicate that the suitable centrifugal
force used to obtaining the irreducible water saturation in centrifugal experiment is 2.76 MPa. The micro-distribution
feature of the movable fluid corresponding to different permeability reservoir is different. The larger the permeability,the
greater the proportion of the movable fluid controlled by the larger throat. 0.100 mD is one of the critical permeability values
when the reservoir permeability larger or less than it,the micro-distribution feature of the movable fluid is different. The average
of the movable fluid saturation of the three gas reservoir is 23.62%. The CT image and constant-rate mercury injection
experimental results suggested that the reservoir fracture and pore-to-throat ratio are the main factors affecting the movable
fluid saturation.

Key words: low permeability volcanic gas reservoir, movable fluid saturation, centrifugal experiment, nuclear magnetic
resonance,
fracture