| 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 |
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| 引用本文： | 卢俊辉,张小莉,杨振,李亚军,王晓琳,赵希.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[J].现代地质,2022,36(4):1131-1137. |
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| 作者姓名： | 卢俊辉 张小莉 杨振 李亚军 王晓琳 赵希 |
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| 作者单位： | 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 7100692.中国冶金地质总局西北地质勘查院,陕西 西安 710119 |
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| 基金项目： | 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) |
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| 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a、b、m和n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lg?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。
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| 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 |
| 收稿时间： | 2021-07-20 |
| 修稿时间： | 2021-08-07 |
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 |
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| LU Junhui,ZHANG Xiaoli,YANG Zhen,LI Yajun,WANG Xiaolin,ZHAO Xi.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[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(4):1131-1137. |
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| Authors: | LU Junhui ZHANG Xiaoli YANG Zhen LI Yajun WANG Xiaolin ZHAO Xi |
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| Institution: | 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, China2. Northwest Geological Exploration Institute of China General Administration of Metallurgical Geology, Xi’an,Shaanxi 710119, China |
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| 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 lg? 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. |
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| Keywords: | tight sandstone Archie formula variable rock-electric parameter saturation model Sulige gas field |
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