Geological assessment for CO₂ storage in the Bahaiwan Basin, East China

The storage potential of selected sites within the Bahaiwan Basin was evaluated, the storage capacity estimated and the selection criteria considered for the COACH project. This paper examines the two methods used during the project for calculation of the storage capacity in the Shengli oilfield complex within the Bahaiwan Basin. Both methodologies were used to quantify the potential CO₂ storage capacity of the depleted oil hydrocarbon reservoirs of the Shengli oilfield complex. They can both be considered as "simple" equation models which try to capture an " approximation" of a possible storage capacity. Nevertheless, between these models several differences exist. The CSLF methodology works with replacement of oil, gas or formation water, but does not incorporate dissolution of CO₂ in formation water. The EOR methodology of CUPB developed from methodology of Tanaka et al. on the other hand includes dissolution of CO₂ into the formation water, but does not consider the time period needed for the dissolution.