欢迎访问现代地质!

现代地质 ›› 2022, Vol. 36 ›› Issue (04): 1131-1137.DOI: 10.19657/j.geoscience.1000-8527.2021.183

• 油气勘探 • 上一篇    下一篇

致密砂岩储层变岩电参数法饱和度计算模型:以苏里格气田西区盒8段例

卢俊辉1,2(), 张小莉1(), 杨振1, 李亚军1, 王晓琳1, 赵希1   

  1. 1.国家与地方碳捕集与封存技术联合工程研究中心/西北大学地质学系/西北大学大陆动力国家重点实验室,陕西 西安 710069
    2.中国冶金地质总局西北地质勘查院,陕西 西安 710119
  • 收稿日期:2021-07-20 修回日期:2021-08-07 出版日期:2022-08-10 发布日期:2022-09-09
  • 通讯作者: 张小莉
  • 作者简介:张小莉,女,教授,博导,1968年出生,石油地质学专业,从事石油地质与测井方面的教学及科研工作。Email: xiaoli_nwu@163.com
    卢俊辉,男,硕士研究生,1994年出生,石油地质学专业,从事测井资料综合解释与油藏描述。Email: 994621213qq.com
  • 基金资助:
    二氧化碳捕集与封存技术国家地方联合工程研究中心与国家科技重大专项(2016ZX05003-006)

Saturation Calculation Model With Variable Rock-Electrical Parameters for Tight Sandstone Reservoirs: A Case Study of the Shihezi Formation (8th Member) in Western Sulige Gas Field

LU Junhui1,2(), ZHANG Xiaoli1(), YANG Zhen1, LI Yajun1, WANG Xiaolin1, ZHAO Xi1   

  1. 1. National and Local Joint Engineering Research Center of Carbon Capture and Storage Technology/Department of Geology/State Key Laboratory of Continental Dynamics, Northwest University, Xi’an,Shaanxi 710069, China
    2. Northwest Geological Exploration Institute of China General Administration of Metallurgical Geology, Xi’an,Shaanxi 710119, China
  • Received:2021-07-20 Revised:2021-08-07 Online:2022-08-10 Published:2022-09-09
  • Contact: ZHANG Xiaoli

摘要:

致密砂岩储层是油气勘探的重点方向之一,由于致密砂岩储层具有低孔低渗、孔隙结构复杂、非均质性强和岩电参数变化等特点,在测井解释过程中不同于常规储层。Archie公式在致密砂岩地层中使用时,强非均质性导致岩电参数abmn会随着储层的变化而变化。针对苏里格西区盒8段致密砂岩储层提出利用变岩电参数建立饱和度模型。依据研究区盒8段储层25块岩心岩电实验分析发现胶结系数m与lgϕ呈二次函数关系、m与岩性系数a呈幂函数关系、束缚水饱和度Swb对饱和度指数n有较大的影响。因此,在对孔隙度、束缚水饱和度和孔隙结构指数等因素分析的基础上,综合各因素影响特征建立了变岩电参数的饱和度模型。结果表明,该方法相对传统Archie公式饱和度解释,模型精度更高,为解释复杂孔隙结构砂岩储层提供了一种有效预测方法。

关键词: 致密砂岩, Archie公式, 变岩电参数, 饱和度模型, 苏里格气田

Abstract:

Tight sandstone reservoirs are one of the major regions for oil and gas exploration. Due to the characteristics of low porosity and permeability, complex pore structure, and strong heterogeneity in rock electrical parameters, logging interpretation process for tight sandstone reservoirs is different from that of conventional reservoirs. When interpreting tight sandstone reservoirs with the Archie formula, strong heterogeneity would lead to changes in the rock electrical parameters a, b, m and n with different reservoirs. In this study, a saturation model is established by using the variable rock electrical parameters for the tight sandstone reservoir in the Shihezi Formation (8th member) in the western Sulige gas field. According to the rock-electrical experiment on 25 cores, we found that the relationship between cementation coefficient m and lgϕ is a quadratic function, the relationship between m and lithology coefficient a is a power function, and the irreducible water saturation Swb has major influence on the saturation index n. Therefore, based on the analysis of porosity, irreducible water saturation and pore structure index, the saturation model with variable rock electrical parameters is established by integrating the various influence factors. The results show that the accuracy of this method is higher than that of the traditional Archie formula, which is effective for interpreting complex pore structure sandstone reservoirs.

Key words: tight sandstone, Archie formula, variable rock-electric parameter, saturation model, Sulige gas field

中图分类号: