鄂尔多斯盆地杭锦旗地区下石盒子组致密砂岩储层孔隙结构及可动流体特征

何云; 王瑞飞; 张占杨; 王濡岳; 尹帅; 何维领; 陈瑞娜; 肖雪

doi:10.19509/j.cnki.dzkq.2022.0134

鄂尔多斯盆地杭锦旗地区下石盒子组致密砂岩储层孔隙结构及可动流体特征

doi: 10.19509/j.cnki.dzkq.2022.0134

何云^1,,
王瑞飞^2a,
张占杨¹,
王濡岳^3, ,,
尹帅^2b,
何维领³,
陈瑞娜^2a,
肖雪^2a

1.
中国石油化工股份有限公司华北油气分公司, 郑州 450006
2a.
西安石油大学石油工程学院, 西安 710065
2b.
西安石油大学地球科学与工程学院, 西安 710065
3.
中国石油化工股份有限公司石油勘探开发研究院, 北京 102206

基金项目:

陕西省重点研发计划重点产业创新链(群): 2022ZDLSF07-04

国家自然科学基金项目 51974253

陕西省教育厅重点项目 18JS084

陕西省高校科协青年人才托举计划 20180703

详细信息

作者简介:
何云(1982-), 男, 高级工程师, 主要从事油气生产技术管理工作。E-mail: 376254397@qq.com

通讯作者:
王濡岳(1990-), 男, 高级工程师, 主要从事非常规油气地质与油气勘探规划研究。E-mail: wry1990@vip.qq.com

中图分类号: P130.2⁺1
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- 文章访问数: 626
- PDF下载量: 119
- 被引次数: 0
出版历程
- 收稿日期: 2022-02-10
- 录用日期: 2022-05-05
- 修回日期: 2022-02-28

Pore structure and movable fluid characteristics of tight sandstone reservoirs in the Lower Shihezi Formation in the Hangjinqi area, Ordos Basin

1.
SINOPEC North China Oil & Gas Branch, Zhengzhou 450006, China
2a.
School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China
2b.
School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China
3.
SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China

摘要

摘要:
核磁共振(NMR)及CT扫描技术对致密砂岩储层评价正发挥越来越重要的作用。以杭锦旗地区下石盒子组盒1段致密砂岩储层为例, 基于NMR及CT扫描系统探讨了致密砂岩中不同类型孔隙的响应特征及流体识别能力。结果表明, 测试样品的孔隙度主要分布在1.7%~10%, 气测渗透率主要分布在0.1×10^-3~1.4×10^-3 μm², T₂弛豫时间截止值主要分布在1~14 ms, 平均值为6.11 ms, 属于典型的低孔、低渗型致密砂岩储层。根据离心前饱和分量T₂弛豫时间曲线, 盒1段储层孔隙类型为双峰型(左峰为主, 右峰不明显), 包括3个亚类: 微孔-小孔型、小孔-中孔型、微孔-小孔-中孔型, 所对应的T₂弛豫时间区间分别为0.1~10, 1~100, 0.1~100 ms。三维CT扫描结果显示, 小孔-中孔型储层的物性特征最好, 其次为微孔-小孔-中孔型储层, 而微孔-小孔型储层的物性相对较差。T₂截止值与样品可动流体含量负相关。盒1段可动流体孔隙度与渗透率具有良好的正相关性, 反映可动流体含量受储层渗透率与喉道显著影响。盒1段致密砂岩储层中可动水饱和度主要分布在4%~9%, 平均值为5.8%。开发实践显示, 盒1段原始可动水饱和度较低, 具有较大开发潜力, 从侧面证实了NMP和CT扫描技术结果的准确性。
- 杭锦旗地区 /
- 核磁共振 /
- CT扫描 /
- 下石盒子组 /
- 致密砂岩 /
- 储层性质 /
- 孔隙结构 /
- 可动流体
Abstract: Objective
In recent years, new discoveries have been made in the He 1 Member of the Hangjinqi Gas Field. And the initial gas production of some wells by fracturing can reach 10×10⁴ m³/d, which shows that the He 1 Member has great exploration potential. However, due to the strong heterogeneity of the He 1 Member, the gas production mechanism of the He 1 Member is not clear at present, which restricts its efficient development. To accurately and quantitatively characterize the microscopic pore structure and movable fluid characteristics of tight gas sandstone reservoirs.
Methods
In this paper, taking the tight sandstone reservoir in the He 1 Member of the Shangshihezi Formation in the Hangjinqi Gas Field as an example, NMR and CT tests were used to study the response characteristics and fluid identification ability of different types of pores in tight sandstone.
Results
The research shows that the porosity of the test samples is mainly distributed in 1.7%-10%, and the gas permeability is mainly distributed in 0.1×10^-3-1.4×10^-3 μm², which belongs to the typical low-porosity and low-permeability porous tight sandstone reservoir. According to the T₂ relaxation time curve of the saturation component before centrifugation, the pore type of the reservoir in the He 1 Member is bimodal (mainly the left peak, the right peak is not obvious), including 3 subtypes: micropore-small pore type, small pore-mesopore type, micropore-small pore-mesopore type. The T₂ relaxation time intervals corresponding to the above three subtypes of pore types are 0.1-10 ms, 1-100 ms, and 0.1-100 ms, respectively. The results of 3D CT scans show that the micropore-mesopore reservoir has the best physical properties, followed by the micropore-small pore-mesopore type, and the micropore-small pore type reservoirs have relatively poor physical properties. The T₂ cut-off values of the tested samples were mainly distributed between 1 and 14 ms, with an average value of 6.11 ms. There is a certain negative correlation between the T₂ cut-off value and the movable fluid percentage of the rock samples. The movable fluid porosity and permeability have a very good positive correlation, reflecting that the amount of movable fluid is significantly affected by the reservoir permeability and the number of throats. The movable water saturation in the tight sandstone reservoirs of He 1 Member in the study area is mainly distributed at 4%-9%, with an average value of 5.8%.
Conclusion
Overall, the original movable water saturation of the He 1 Member is low and has great development potential.
- Hangjinqi area /
- nuclear magnetic resonance /
- CT scanning /
- Lower Shihezi Formation /
- tight sandstone /
- reservoir property /
- pore structure /
- movable fluid
注释:

(所有作者声明不存在利益冲突)

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图 1 NMR测试样品的渗透率与孔隙度的关系

Figure 1. Relationship between permeability and porosity of NMR test samples

下载: 全尺寸图片幻灯片

图 2 基于离心前饱和分量核磁共振曲线的致密砂岩储层孔隙结构类型划分

a. 3号样品, 2 572.29 m, 微孔-小孔型; b. 6号样品, 3 368.12 m, 小孔-中孔型; c. 8号样品, 3 223.36 m, 微孔-小孔-中孔型

Figure 2. Classification of pore structure types in tight sandstone reservoirs based on NMR curves of saturation components before centrifugation

下载: 全尺寸图片幻灯片

图 3 研究区盒1段致密砂岩储层6号样品三维CT扫描结果

a~b.样品逐层扫描；c.样品原始切片；d.阈值分割后提取的孔隙分布(蓝色)；e.三维孔隙分布；f.样品内部含铁矿物三维分布

Figure 3. 3D CT scan results of Sample No.6 of tight sandstone reservoirs in the He 1 Member in the study area

下载: 全尺寸图片幻灯片

图 4 基于三维CT扫描的致密砂岩样品的孔喉分布特征

a.3号样品，微孔-小孔型，孔隙度4.2%，渗透率0.26×10^-3 μm²；b.6号样品，小孔-中孔型，孔隙度7.3%，渗透率0.71×10^-3 μm²；c.8号样品，微孔-小孔-中孔型，孔隙度6.7%，渗透率0.52×10^-3 μm²

Figure 4. Pore throat distribution characteristics of tight sandstone samples based on 3D CT scanning

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图 5 基于NMR及CT测试的储层可动流体孔隙度与孔喉参数的关系

Figure 5. Relationship between porosity and pore throat parameters of reservoir movable fluid based on NMR and CT measurements

下载: 全尺寸图片幻灯片

图 6 利用NMR曲线识别T₂截止值示意图

Figure 6. Schematic diagram of identifying the T₂ cut-off value using NMR curves

下载: 全尺寸图片幻灯片

图 7 研究区盒1段致密砂岩样品T₂截止值、物性参数及流体参数的分布特征

Figure 7. Distribution characteristics of the T₂ cutoff value, physical property parameters and fluid parameters of tight sandstone samples in the He 1 Member of the study area

下载: 全尺寸图片幻灯片

图 8 可动流体孔隙度与渗透率的关系

Figure 8. Relationship between the movable fluid porosity and rock permeability

下载: 全尺寸图片幻灯片

图 9 致密砂岩样品可动水饱和度(a)、束缚水饱和度(b)与孔隙度的关系

Figure 9. Relationship between movable water saturation (a), irreducible water saturation (b) and porosity of tight sandstone samples

下载: 全尺寸图片幻灯片

表 1 样品基本信息

Table 1. Basic information of the samples

样品编号	井号	深度/m	氦气孔隙度/%	气测渗透率/10^-3 μm²	岩性
1	J119	3 372.44	7.0	0.69	中粗砂岩
2	J136	3 562.71	1.7	0.08	中砂岩
3	J120	2 572.29	4.2	0.26	中砂岩
4	J137	3 422.38	7.9	0.56	中砂岩
5	J137	3 422.93	6.2	0.26	粗砂岩
6	J119	3 368.12	7.3	0.71	粗砂岩
7	J137	3 424.08	9.1	1.13	中粗砂岩
8	J144	3 223.36	6.7	0.52	细砂岩
9	J137	3 474.10	9.2	1.19	中砂岩
10	J51	2 732.94	10.1	0.61	中砂岩

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