咸水层CO2注入动态分析及封存潜力评估方法OA

To enable rapid identification of reservoir properties and accurate evaluation of storage poten-tial during CO2 injection in saline aquifers,a two-phase RTA method suitable for injection scenarios is proposed.The mathematical model for CO2-brine two-phase flow incorporating stress-sensitive effects is developed.The model introduces pseudopressure and pseudotime functions,coupled with the material balance equation,provides an analytical solution.A set of diagnostic plots is constructed to segment the entire injection process into distinct two-phase flow regimes,while straight-line analysis is used to invert aquifer properties.The resutts show that,by integrating an injectivity forecasting model and accounting for both geological constraints and economic considerations,the method enables predictive analysis of CO2 injection performance and dynamic storage capacity.Validation using synthetic and field injection cases demonstrates the method s high accuracy in reservoir characterization and strong applicability in engineering practice.This result offers valuable support for field deployment and risk management of CO2 geological storage.