Abstract:

Diagenetic mineral fluid inclusion contains abundant information about forming of reservoir and mineralization. Reservoiring period and stages, age and history can be determined through analyzing of fluid inclusions. Diagenetic mineral fluid inclusions from CO₂ reservoirs in Jiyang depression were studied through analyzing of high temperature brine inclusion, homogenization temperature ,salinity of triphase of CO₂-brine-water, laser Raman probe characteristics, etc. The temperature and pressure conditions, carrying and gathering mechanism, as well as forming period and order of CO₂ reservoirs were determined．Finally, a conclusion was made that Late Tertiary, especially the Quaternary Period was the dominantly reservoiring stage of CO₂ in Jiyang depression.

Key words: Jiyang depression, reservoiring order, fluid inclusion, homogenization temperature, filing period