Abstract

Movable fluid parameter is an important index to evaluate the seepage characteristics of tight sandstone reservoir. Combined with high-pressure displacement and nuclear magnetic resonance movable fluid testing principle, the nuclear magnetic resonance movable fluid characteristics of six typical tight sandstone core samples of Xujiahe Formation in Central Sichuan Basin were studied. Based on mercury injection capillary pressure curve, the nuclear magnetic resonance T2 spectrum distribution was converted into pore throat According to the radius distribution, the minimum pore throat radius of the movable fluid and the contribution of different pore sizes to the movable fluid are determined. The research shows that the movable fluid saturation of the tight sandstone reservoir in the second member of Xujiahe Formation in Central Sichuan is closely related to the pressure difference, with good logarithmic correlation, and the main contribution to the movable fluid saturation is the reservoir space > 0.1 μm. 70% of the total movable fluid saturation is injected at a lower pressure (about 5MPa). In the later stage, high pressure injection can only enter the reservoir pore with small pore size, and the total amount is small and increases slowly. Therefore, the total contribution of high pressure drive to gas saturation in the later stage is small.

Details

Title
Distribution characteristics of movable fluid in tight sandstone based on nuclear magnetic resonance
Author
Yang, Chunlong 1 ; Xie, Zengye 1 ; Li, Jian 1 ; Zheng, Yue 2 ; Wang, Xiaobo 1 ; Guo, Jianying 1 ; Yang, Chunxia 1 ; Liu, Zhixin 3 ; Zhang, Lu 4 

 Petrochina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China; Key Laboratory of Gas Reservoir Formation and Development, CNPC, Lang fang, 065007, China 
 University of Chinese Academy of Sciences, Beijing 100079 
 CNPC Economics & Technology Research Institute, Beijing 100724, China 
 Petrochina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China 
Publication year
2021
Publication date
May 2021
Publisher
IOP Publishing
ISSN
17551307
e-ISSN
17551315
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2528495610
Copyright
© 2021. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.