新疆石油地质 ›› 2020, Vol. 41 ›› Issue (3): 288-294.doi: 10.7657/XJPG20200305

• 油藏工程 • 上一篇    下一篇

基于核磁共振实验的火山岩气藏原始含气饱和度分析

张明玉, 孔垂显, 齐洪岩, 李亮, 周阳, 苏静, 蒋庆平   

  1. 中国石油 新疆油田分公司 勘探开发研究院,新疆 克拉玛依 834000
  • 收稿日期:2019-03-25 修回日期:2019-12-09 出版日期:2020-06-01 发布日期:2020-06-05
  • 作者简介:张明玉(1962-),男,山东胶南人,高级工程师,硕士,石油工程,(Tel)0990-6882377(E-mail)zhmy@petrochina.com.cn
  • 基金资助:
    中国石油科技重大专项(2017E-0405)

Analysis on Original Gas Saturation of Volcanic Gas Reservoir Based on NMR Experiment

ZHANG Mingyu, KONG Chuixian, QI Hongyan, LI Liang, ZHOU Yang, SU Jing, JIANG Qingping   

  1. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
  • Received:2019-03-25 Revised:2019-12-09 Online:2020-06-01 Published:2020-06-05

摘要:

为分析X气田低渗透火山岩气藏的含气饱和度,采用核磁共振实验,对5口井50块岩心进行了含气饱和度测试。结果表明,离心实验标定离心力为2.760 MPa时,对应的有效渗流喉道半径下限为0.053 μm时,求取的可动流体饱和度与实验结果和生产数据吻合均较好;当离心力大于2.760 MPa,随离心力的继续增加,岩心的束缚水饱和度变化很小;离心力小于2.760 MPa时,可动流体饱和度近似为储集层的原始含气饱和度,该离心力下实验标定的T2(可动流体弛豫时间)值即为目标储集层的T2截止值,可用来直接判断气藏储集层的原始含气饱和度和原始含水饱和度。利用核磁共振T2谱法能够较准确地评价火山岩气藏原始含气饱和度,为相似岩性气藏的含气饱和度测井解释提供了岩石物理理论基础和技术支撑。

关键词: 核磁共振, 火山岩气藏, 含气饱和度, 全直径岩心, 离心力, 孔喉半径, 弛豫时间

Abstract:

In order to analyze the gas saturation of the low-permeability volcanic gas reservoir in X gas field, nuclear magnetic resonance(NMR)experiments were carried out to analyze the gas saturations of 50 pieces of cores from 6 wells in the area. The results show that when the calibrated centrifugal force is 2.760 MPa in the centrifugal experiment and the lower limit of the effective flowing throat radius is 0.053 μm, the calculated movable fluid saturation agrees well with the experimental results and the field production data. When the centrifugal force is higher than 2.760 MPa, the irreducible water saturation of the core changes a little with the increase of the centrifugal force. When the centrifugal force is lower than 2.760 MPa, the movable fluid saturation is approximate to the original gas saturation of the reservoir, and the T2 value calibrated by the experiment can be considered as the T2 cutoff of the target reservoir and can be directly used to determine the original gas saturation and the original water saturation of the gas reservoir. The method of NMR T2 spectrum can be used to accurately evaluate the original gas saturation of the volcanic gas reservoir, which provides theoretical basis and technical support for logging interpretation of gas saturation in similar gas reservoirs.

Key words: NMR, volcanic gas reservoir, gas saturation, full diameter core, centrifugal force, pore throat radius, relaxation time

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