Multi-well pad storage of H2 and/or NH3 with simultaneous CO2 sequestration

A method of gas sequestration comprising:

• producing at least ammonia, hydrogen gas, and carbon dioxide above ground from a fossil-fueled ammonia production plant;
• injecting at least a portion of the ammonia from the fossil-fueled ammonia production plant into an ammonia storage unit by way of an ammonia injection well located proximate the fossil-fueled ammonia production plant;
• injecting at least a portion of the hydrogen gas from the fossil-fueled ammonia production plant into a hydrogen storage unit by way of a hydrogen injection well located proximate the fossil-fueled ammonia production plant;
• and
• injecting at least a portion of the carbon dioxide from the fossil-fueled ammonia production plant into a carbon dioxide storage unit by way of a carbon dioxide injection well located proximate the fossil-fueled ammonia production plant;
• wherein the at least portion of the ammonia is injected concurrently with the at least portion of the carbon dioxide;
• and
• wherein an ammonia injection wellhead, a hydrogen injection wellhead, and a carbon dioxide wellhead are located on a multi-well pad.

A gas sequestration system comprising:

• a fossil-fueled hydrogen production plant;
• a separator in fluid communication with the fossil-fueled hydrogen production plant that receives a mixture of hydrogen gas and carbon dioxide from the fossil-fueled hydrogen production plant;
• a hydrogen injection well in fluid communication with the separator and proximate to the fossil-fueled hydrogen production plant that extends into a geological hydrogen storage unit located underground;
• a carbon dioxide injection well in fluid communication with the separator and proximate to the fossil-fueled hydrogen production plant that extends into a geological carbon dioxide storage unit located underground, wherein a hydrogen injection wellhead and a carbon dioxide injection wellhead are located on a multi-well pad;
• and
• one or more compressors located on the multi-well pad;
• wherein the geological hydrogen storage unit utilizes a salt dome cavern storage facility.