Dear Oumer Tahir,
I do have a little problem with "mega" in your question.
Any project where the CO2 is not vented into the air, but stored for later use in the undergroud would be a success in the view of COP27.
Germany put a lot of finance into CCS during the first decade of this century. Thus a lot of research has been done and results have been published in German and Englisch. There are complete design criteria for wells available and even p&a-strategies.
However, Germans did not like the idea that CO2 is stored underground, just like they do not want to tap the unconventional hydrocarbon reservoirs if hydraulic stimulation is needed.
Thus a sino-german cooperation group "underground storage of CO2 and energy" was formed by the main chinese and main german research founders. This vehicle was used to transfer the CCS knowledge to China.
You should contact this sino-german cooperation group at Energie Forschungszentrum in Goslar (https://www.efzn.de/de/home/) if you need the research results.
Research continued in China and also first pilot projects have been put in place.
Also natural gas exploration took place in the German North Sea sector during the first decade of this century. High pressure natural gas reservoirs have been found. BUT the natural gas was mostly nitrogen. The natural gas could not be ignited due to the nitrogen content.
Reserach took place in order to find a way to use the natural gas in the German North Sea Sector. One option was called baseload power from the north sea: https://www.windenergie.tu-clausthal.de/forschung/
other options looked at the option to vent the nitrogen to the air running it through turbines that drive generators in order to generate power. However the hydrogen carbonate content was to high for untreated ventilation to air.
Lately, I learned that a CO2 line is planed through the German sector of the North Sea and a foreign enterprise wants to produce the nitrogen and replace the void created by extration, with CO2, hence CCS.
Germans did not accept the CCS under their feet, but they will accept the CCS technology offshore, if you do not see the offshore installations from the island beaches during summer holidays.
Thus I recommend that you get in touch with the efzn-reserachers in Goslar