The geology of carbon dioxide (CO2) sequestration is essentially the geology of petroleum exploration. Basically, the search for oil is the search for sequestered hydrocarbons. Therefore, the geological conditions that are conducive to hydrocarbon sequestration are also the conditions that are conducive to CO2 sequestration. The three requirements for sequestering hydrocarbons are a hydrocarbon source, a suitable reservoir, and an impermeable trap. These requirements are the same as for sequestering CO2, except that the source is artificial and we refer to the reservoir as a sink. Reviewing the tectonic origin and structure of a basin, as well as its hydrogeology and geology, including the petroleum geology, can lend valuable insights in any attempt to identify geological sinks for CO2 sequestration in an oil-producing basin.