基于微观孔喉结构及渗流特征建立致密储层分类评价标准——以鄂尔多斯盆地陇东地区长7储层为例

徐永强; 何永宏; 卜广平; 陈霖; 刘林玉; 朱玉双

doi:10.11781/sysydz201903451

基于微观孔喉结构及渗流特征建立致密储层分类评价标准——以鄂尔多斯盆地陇东地区长7储层为例

doi: 10.11781/sysydz201903451

1. 西北大学大陆动力学国家重点实验室/地质学系, 西安 710069;
2. 中国石油长庆油田分公司开发事业部, 西安 710018;
3. 中国石油长庆油田分公司第六采油厂, 西安 710018;
4. 中国石油长庆油田分公司勘探开发研究院, 西安 710018

基金项目:

国家重大科技专项项目（2017ZX05013004）和中国石油股份有限公司重大科技专项（2016E-0505）资助。

详细信息

作者简介:
徐永强(1989-),男,博士研究生,从事油气田勘探开发研究工作。E-mail:421704657@qq.com。

通讯作者:
刘林玉(1965-),男,教授,从事油气储层地质、油气田开发及沉积学研究。E-mail:yulinliu@126.com。

中图分类号: TE122.24
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出版历程
- 收稿日期: 2018-11-21
- 修回日期: 2019-04-08
- 刊出日期: 2019-05-28

Establishment of classification and evaluation criteria for tight reservoirs based on characteristics of microscopic pore throat structure and percolation: a case study of Chang 7 reservoir in Longdong area, Ordos Basin

1. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China;
2. Development Department, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710018, China;
3. NO.6 Oil Production Plant, Changqing Oilfield Branch Company, PetroChina, Xi'an, Shaanxi 710018, China;
4. Research Institute of Exploration and Development, Changqing Oilfield Branch Company, PetroChina, Xi'an, Shaanxi 710018, China

摘要

摘要: 以鄂尔多斯盆地陇东地区长7致密储层为例，通过物性分析、铸体薄片、扫描电镜、CT扫描、高压压汞、恒速压汞等实验对微观孔喉特征进行分析，结合核磁共振、可视化多相渗流实验分析流体渗流特征，选择合理的评价参数对致密储层进行分类评价。陇东地区长7致密储层平均孔隙度、渗透率分别为9.33%和0.18×10^-3 μm²；孔隙类型以长石溶孔、粒间孔为主，平均面孔率为1.89%，孔喉半径主要分布在小于1 μm的范围内，其储集能力较强，但连通性差；主要受细小孔喉控制，可动流体饱和度及驱油效率较低，非均质性对驱油效率也有一定影响。选择孔隙度、渗透率、面孔率、平均孔喉半径、均值系数、排驱压力、可动流体饱和度、驱油效率作为评价参数，利用多元分类系数法进行分类并建立致密储层评价标准，将储层由好到差依次分为Ⅰ、Ⅱ、Ⅲ和Ⅳ类。
- 微观孔喉特征 /
- 渗流特征 /
- 储层评价 /
- 致密储层 /
- 陇东地区 /
- 鄂尔多斯盆地
Abstract: Taking the Chang 7 reservoir in the Longdong area of the Ordos Basin as an example, the microscopic pore throat characteristics were comprehensively analyzed through physical analysis, casting thin section, scanning electron microscope, CT scanning, high pressure mercury injection and constant rate mercury injection experiments. Fluid seepage was analyzed by NMR and visualized multiphase seepage experiments. Some reasonable evaluation parameters were selected to classify and evaluate tight reservoirs. The average porosity and permeability of the Chang 7 tight reservoir in the Longdong area are 9.33% and 0.18×10^-3 μm², respectively. The main pore types are feldspar dissolved pore and intergranular pore, with an average plane porosity of 1.89%. The pore throat radius is small, mainly distributed in the range of less than 1 μm. Its reservoir capacity is strong, but its connectivity is poor. The movable fluid saturation and oil displacement efficiency are mainly controlled by the fine pore throat, and the heterogeneity also has a certain influence on the oil displacement efficiency. Porosity, permeability, plane porosity, average pore throat radius, mean value coefficient, displacement pressure, movable fluid saturation and oil displacement efficiency are selected as evaluation parameters, and a multi-classification coefficient method is used to classify and establish an evaluation criteria for tight reservoirs, which are divided into Ⅰ, Ⅱ, Ⅲ and IV from good to bad.
- characteristics of microscopic pore throat /
- percolation characteristics /
- reservoir evaluation /
- tight reservoir /
- Longdong area /
- Ordos Basin

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