Thermodynamic effects of cycling carbon dioxide injectivity in shale reservoirs

Molecular simulation of displacement of shale gas by carbon dioxide at different geological depths

The interaction of shale–CO2 during the CO2 sequestration and enhanced shale gas recovery process has significant influence on the adsorption properties of shale. In this study, the influence of supercritical CO2 (ScCO2) exposure on CH4 and CO2 adsorption behavior of shale was studied. The pore structure and functional groups of different shale samples before and after ScCO2 (P = 8 MPa, 12 MPa, 16 MPa; T = 35 °C) exposure were measured by low-pressure nitrogen adsorption and the Fourier transform infrared spectroscopy (FTIR) method, respectively. Moreover, CH4 and CO2 adsorption isotherms of shale samples before and after ScCO2 exposure were also obtained to reveal the mechanism of the influence of ScCO2 exposure on CH4 and CO2 adsorption behaviors of shale. The results indicated that after treatment by ScCO2 the adsorption capacity of CO2 and CH4 in all tested samples was decreased. The main reason for the decrease is the change of pore structures, mineral compositions, and surface chemistry in shale cau...

Influence of Supercritical CO2 Exposure on CH4 and CO2 Adsorption Behaviors of Shale: Implications for CO2 Sequestration

N. Riazi

Papers

Nanopores to megafractures: Current challenges and methods for shale gas reservoir and hydraulic fracture characterization

Huff-N-Puff Gas Injection Performance in Shale Reservoirs: A Case Study From Duvernay Shale in Alberta, Canada

Determination of elastic properties of tight rocks from ultrasonic measurements: Examples from the Montney Formation (Alberta, Canada)