Study On The Buried Mechanism And Numerical Simulation Of CO 2 Subcategory In Underground Saline

Greenhouse effect which is mainly caused by the CO2brought about a series of ecological and environmental issues, such as hurricanes intensify, species extinction, acid rain, bad weather, rising sea levels, etc. Injecting CO2into saline aquifer is an effective way to alleviate the problem. The technology abroad has caught the government and the public’s attention, and has established a better mathematic models and simulation software. Compare to the national development, China’s study on CO2sequestration in saline aquifer is not long. For the status of domestic research, this paper studies CO2sequestration mechanism, influencing factors of CO2in saline aquifers to provide theoretical supporting for sequestration.By the study, the mechanism of sequestration of carbon dioxide sequestration was found which includes structural trapping, residual gas trapping, solubility trapping, mineral trapping. Each of the four mechanisms plays a role in sequestration simultaneously, but over time the residual gas, solubility, mineral trapping play a growing role. Temperature, pressure, porosity and other reservoir parameters have an impact on the buried stock and sequestration effect of CO2, the analysis is mainly relies on the enhance effect of solubility by contact, the competitive relationship between residual gas trapping and dissolution, mobility of CO2and other principles. Found through simulation, the buried stock will increase with the larger porosity;but the temperature and pressure acts an reverse effect;the permeability and the vertical and horizontal permeability ratio will fluctuate the buried stock with a overall increasing; and with the increasing injection rate,buried stock increases and decreases,but will be stable on the whole. By sensitivity analysis, the porosity is the largest impacts of cumulative gas injection, so it is recommended that porosity should be putted in a priority place when sequestrating CO2in saline aquifers. Finally, different sequestration schemes were compared and found drainage gas injection buried much more stock than continuous gas injection, the program can be used as a reference when sequestrate CO2into saline aquifers.