Integrated Reservoir Modeling to Maximize the Value of a Large Sour-Gas Field with High Concentrations of Inerts

Constraining the Fluid History of a CO2‐H2S Reservoir: Insights From Stable Isotopes, REE, and Fluid Inclusion Microthermometry

“…On the west side, the LaBarge Field is confined by an eastward plunging basement involved reverse fault (Dixon, ; Kraig et al, ; Stilwell, ; Figure b). The gas trapped in the LaBarge Field consists on average of 66% CO 2 , 21% CH 4 , 7% N 2 , 5% H 2 S, and 0.6% He (Huang et al, ). The Madison Formation consists of alternating limestone and dolomite (Huang et al, ) and exhibits an average porosity of 8%–10%, a permeability of 10–50 mD, and a residual water saturation of 10% (Huang et al, ).…”

“…The gas trapped in the LaBarge Field consists on average of 66% CO 2 , 21% CH 4 , 7% N 2 , 5% H 2 S, and 0.6% He (Huang et al, ). The Madison Formation consists of alternating limestone and dolomite (Huang et al, ) and exhibits an average porosity of 8%–10%, a permeability of 10–50 mD, and a residual water saturation of 10% (Huang et al, ). The limestone and dolomite beds reach maximum thicknesses of 20 m with dolomite slightly dominating in abundance over limestone.…”

“…The gas forms a 250‐m‐thick gas column and is the largest known natural CO 2 accumulation in the world (Allis et al, ; Lynds et al, ; Stilwell, ). Different sources for the CO 2 and H 2 S at the LaBarge Field have been proposed including thermal degradation of hydrocarbons, breakdown of carbonates, volcanic gas migration, and TSR (De Bruin, ; Huang et al, ; Stilwell, ). TSR is a redox reaction where sulfate is reduced to form hydrogen sulfide and hydrocarbons are simultaneously oxidized to form carbon dioxide (Orr, ).…”

Baseline geochemical characterization of potential receiving reservoirs for carbon dioxide in the Greater Green River Basin, Wyoming

“…The limited areas drowned in these incursions received several tens of feet of conodont-bearing dark shale and silty dolomite now recognized as a basal member of the Madison sequence (Boyd, 1993). The Madison is the most productive gas reservoir in the Green River Basin, with an original inplace natural gas resource of 22 trillion standard cubic feet (TSCF; Huang et al, 2007). Production is mainly from the LaBarge Platform at the northern end of the Moxa Arch.…”

“…It is injected into a subsurface geologic receiving formation at sufficient depth (greater than ~2625 ft (800 m)) to maintain the CO 2 in a supercritical state. Natural subsurface accumulations of CO 2 , including many in Wyoming, show that the gas can be trapped for millions of years (Huang et al, 2007;Lu et al, 2009).…”