基于合金注入与大视域图像技术的致密储层孔隙与喉道表征

唐相路; 萧汉敏; 姜振学; 刘学伟; 杨再权; 刘格; 张帆

doi:10.11781/sysydz202301185

基于合金注入与大视域图像技术的致密储层孔隙与喉道表征

doi: 10.11781/sysydz202301185

1.
中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249
2.
中国石油勘探开发研究院, 北京 100083

基金项目:

国家自然科学基金 41802153

国家自然科学基金 41872135

中国石油天然气股份有限公司“十四五”科技专项 2021DJ2201

详细信息

作者简介:
唐相路(1988—)，男，博士，副研究员，从事非常规油气储层表征与成藏机理教学和科研工作。E-mail: tangxl@cup.edu.cn

中图分类号: TE135
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出版历程
- 收稿日期: 2022-01-26
- 修回日期: 2022-11-21
- 刊出日期: 2023-01-28

Pore and throat characterization of tight reservoirs based on the methods of alloy injection and large-field image stitching

1.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
2.
Research Institute of Exploration and Development, PetroChina, Beijing 100083, China

摘要

摘要: 致密油气是我国油气资源的重要组成部分，对其孔喉结构的研究有利于推进致密油气地质理论的丰富和完善。以鄂尔多斯盆地三叠系延长组致密储层为例，通过高温高压合金注入装置，结合大视域图像拼接技术与图像孔隙提取方法，建立了致密储层孔隙结构表征新方法。结果表明，将合金注入致密储层孔隙中可以较好地反映孔隙连通性特征，使孔隙形貌和结构更加容易辨别。大视域图像拼接方法解决了孔隙分布非均质性强、小视域观察代表性差的问题。鄂尔多斯盆地延长组致密储层主要发育粒间孔、粒内孔和粒间—粒内混合孔，其中粒间孔最为发育。孔隙缩小型喉道、缩颈型喉道、管束型喉道、片状喉道和弯片状喉道是其发育的5种喉道类型，其中弯片状喉道最为发育。石英和长石的孔隙明显大于其他矿物孔隙，对致密储层面孔率的贡献率达74%，是致密油气重要的赋存空间。
- 孔喉结构 /
- 合金注入 /
- 大视域图像 /
- 孔喉提取 /
- 致密储层
Abstract: Tight oil and gas is an important part of China's oil and gas resources, and the study of related pore-throat structure is conducive to the enrichment and improvement of tight oil and gas geological theory. Taking the tight reservoir of the Triassic Yanchang Formation in the Ordos Basin as an example, combined with large-field image stitching method and image pore extraction method, this paper established a new method for pore-throat structure characterization of tight reservoir with high-temperature and high-pressure alloy injection. Results show that the alloy injected into the pores of tight reservoirs can reflect the characteristics of pore connectivity better, and the pore morphology and structure are easier to be identified. The large-field image stitching method solves the problem of strong heterogeneity of pore distribution and poor representativeness of small-field observation. The tight reservoirs of the Yanchang Formation in the Ordos Basin are mainly composed of intergranular pores, intragranular pores, and intergranular-intragranular mixed pores, among which the intergranular pores are mostly developed. There are five types of throats, including pore shrinkage throat, neck constricted throat, bundle throat, sheet throat and curved sheet throat, among which the curved sheet throat is mostly developed. The porosity of quartz and feldspar is significantly larger than that of other minerals, contributing 74% to the surface porosity of tight reservoir, and is an important occurring space for tight oil and gas.
- pore-throat structure /
- alloy injection /
- large-field image /
- pore-throat extraction /
- tight reservoir

HTML全文

图 1 高温高压合金注入装置工作原理

Figure 1. Working principle of alloy injection device with high temperature and pressure

下载: 全尺寸图片幻灯片

图 2 大视域图像拼接原理及方法

Figure 2. Schematic diagram of large-field image stitching method

下载: 全尺寸图片幻灯片

图 3 孔喉提取方法示意图

Figure 3. Schematic diagram of pore-throat extraction method

下载: 全尺寸图片幻灯片

图 4 有无合金注入图像差异

Figure 4. Image difference before and after alloyed injection

下载: 全尺寸图片幻灯片

图 5 致密储层孔隙发育类型及特征

Figure 5. Types and characteristics of pores in tight reservoirs

下载: 全尺寸图片幻灯片

图 6 致密储层喉道发育类型及特征

Figure 6. Types and characteristics of throats in tight reservoirs

下载: 全尺寸图片幻灯片

图 7 致密储层孔隙分布特征

Figure 7. Distribution characteristics of pores in tight reservoirs

下载: 全尺寸图片幻灯片

图 8 致密储层喉道分布特征

Figure 8. Distribution characteristics of throats in tight reservoirs

下载: 全尺寸图片幻灯片

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