Patent ID: 11873445
Assignee: UNIVERSITY OF WYOMING
Field: Civil engineering (Other fields)
Classification: CPC C  E  G | IPC C  E  G

Claim 0:
1. A method for sequestering CO2 in a coal reservoir, the method comprising:
delivering a feedstock downhole to a coal reservoir via an injection well;
generating a biogas through microbial action, wherein the biogas comprises an isotopically differentiable methane and an isotopically differentiable CO2, within the coal reservoir that is isotopically differentiable from a background gas, wherein the background gas comprises a background methane and background CO2 that is native to the coal reservoir;
harvesting the isotopically differentiable methane and CO2 and background methane and CO2 at the injection well and one or more offset wells of the coal reservoir, wherein the isotopically differentiable CO2 and background CO2 concentration is less than 5% of the biogas and background gas;
analyzing the isotopically differentiable methane and CO2 and background methane and CO2 from the coal reservoir at the injection well and at one or more offset wells within the same coal reservoir;
detecting the isotopically differentiable methane and CO2 and background methane and CO2 at the offset wells; and
mapping migration of the isotopically differentiable methane and CO2 from the injection well through the coal reservoir to the offset wells using the isotopically differentiable methane and CO2 as an isotopic tracer.