With the great success of unconventional oil and gas exploration and development in the world, more and more attention has been paid to the pore structure characteristics of tight rock reservoirs. The soul of unconventional oil and gas research is the reservoir, the goal of which is to answer how much oil and gas is stored in the reservoir. Pores in tight oil reservoirs are the main places for oil and gas storage and percolation, therefore, it is the key and difficult point for unconventional oil and gas research to accurately characterize the microscopic pore structure of reservoirs. This paper classifies the pore structure characterization technologies of tight oil reservoirs, namely experimental data analysis technology, image analysis technology and digital core technology. Each type of characterization technology is summarized, and its test range for pore size, advantage and disadvantage are pointed out. Finally, by reviewing the existing characterization technology, the development trend of microscopic pore structure characterization technology for tight oil reservoirs is further prospected.

tight reservoir  /  pore structure  /  characterization technology