Rock typing in tight gas sands : a case study in Lance and Mesaverde formations from Jonah field
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The Jonah field is one of the biggest tight gas sand fields in the Green River basin. Production profiles from its deeper sections show high liquid hydrocarbons close to the Pinedale anticline, especially in Mesaverde and Lance formations. To assess the potential of condensate production, new approaches for rock classi_cation are needed that will allow us to differentiate between discontinuous sandstone layers and the interbedded siltstones. Currently, the only cut off used is for gamma ray: rocks below 75 API are designated as sandstones. Although, significant porosity and permeability variations ...