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- Title
玛西斜坡百口泉组致密砂砾岩储层速敏 特征及主控因素.
- Authors
王 蓓; 胡艺潇; 周 伟; 周 浩; 寇 根; 刘 赛; 许 宁; 祝 鹏
- Abstract
The glutenite reservoir in Xinjiang have a strong velocity (flow rate) sensitivity and its main control factors are not clear because of its wide particle size distribution and strong heterogeneity. In this study, different techniques were used for core analysis with core samples from Baikouquan Formation in Maxi slope, including thin section analysis, scanning electron microscope, high-pressure mercury injection and velocity sensitivity experiments. The results show that the clay minerals content has a weak influence on the velocity sensitivity of the samples, while the physical property is the main factor affecting the sensitivity of the glutenite reservoir, and the permeability ratio decreases rapidly at first and then slowly declines with the increase of flow rate. When the permeability is less than 0.1×10-3 μm², with the improvement of reservoir physical properties, the throat gradually becomes larger, and some minerals (particles) that were difficult to pass through the throat can pass through the throat along with the fluid flow, and so the velocity sensitivity index decreases with the improvement of permeability. When the permeability is greater than 0.1×10-3 μm², the throat radius involved in flow changes little, but the pores are well connected and there are many connected throats. More clay minerals that did not move firstly in the pores begin to move along with the flowing displacement fluid. But when there are enough minerals (particles), the throat can be blocked, resulting in the decrease of permeability and the increase of velocity sensitivity index with the improvement of permeability.
- Subjects
SCANNING electron microscopes; PARTICLE size distribution; CLAY minerals; FLUID flow; DRILL core analysis
- Publication
Journal of China University of Petroleum, 2024, Vol 48, Issue 4, p141
- ISSN
1673-5005
- Publication type
Article
- DOI
10.3969/j.issn.1673-5005.2024.04.015