Dawsonite occurrences related to the age and origin of CO₂ influx in sandstone reservoirs: A case study in the Songliao Basin, NEChina

Dawsonite is often associated with CO 2 ‐rich gas reservoirs, and it is regarded as a “trace mineral” for recording migration and accumulation of CO 2 . Following accepted petrological, mineralogical, and geochemical principles, we used several methods (described herein) to study the Cretaceous dawsonite‐bearing sandstone reservoirs in the Songliao Basin, China. We used the ideas of “sequencing” and “timing” to verify the influx stages of CO 2...