Systems and methods of carbon dioxide sequestration

A system for sequestering carbon dioxide using produced water that originates from hydrocarbon production, the system comprising:

• a reaction vessel configured to receive a produced water supply, the produced water supply includes produced water that originates from the hydrocarbon production, wherein the produced water includes at least one in-situ chemical species, wherein the reaction vessel is further configured to receive a gas supply, the gas supply including carbon dioxide gas;
• and
• one or more diffusers, wherein the one or more diffusers are configured to receive at least a portion of the gas supply to diffuse the carbon dioxide gas into at least a portion of the produced water, and wherein the reaction vessel is further configured to contain a mixture to allow the at least one in-situ chemical species of the produced water to react with the carbon dioxide gas to sequester the carbon dioxide gas by forming at least one reaction product, wherein the at least one reaction product settles at a lower level in the reaction vessel.