Reinjection Water Sequencing

The reinjection water samples used in this study were collected from offshore oilfields in the Bohai Sea. Sample B-1 was taken from the outlet of a water injection pump in the Jinzhou Oilfield. Sample B-2 was obtained from a well in the Penglai Oilfield, and sample B-3 was collected from a well in the Minghuazhen block of the Qikou Oilfield.