Understanding Pore-Throat Structures in Tight Sandstone Reservoirs
Author Information
Author(s): Zhu Yan, Yang Yunfei, Zhang Yuheng, Liu Lin, Li Hengquan, Sang Qin
Primary Institution: Exploration and Development Research Institute of Sinopec Henan Oilfield Branch, Nanyang, China
Hypothesis
The study aims to clarify the heterogeneity and permeability estimation of pore-throat structures in tight sandstone reservoirs.
Conclusion
The research indicates that the pore-throat structure of tight sandstone has multi-scale characteristics, significantly affecting its physical properties and permeability.
Supporting Evidence
- The study found that the pore types are mainly dissolved pores, with sizes primarily in the nano to submicron range.
- The fractal dimension fitting curve indicates that the pore-throat structure has multi-scale characteristics.
- The average fractal dimension of large-scale pore-throats is 3.72, while that of small-scale pore-throats is 2.22.
- The research provides a theoretical basis for evaluating the productivity of ultra-low permeability tight sandstone.
Takeaway
This study looks at tiny holes in rocks that hold oil and gas, helping us understand how to find and use these resources better.
Methodology
The study used various rock physics experiments including gas measurement of porosity and permeability, casting thin sections, scanning electron microscopy, and high-pressure mercury injection.
Limitations
The study may not fully account for all geological variations in tight sandstone reservoirs.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website