Method for quantifying permeability of vuggy carbonates using wireline logs
AssigneeSchlumberger Technology Corporation
InventorsChunming Xu, Bill M. Newberry
Life of this patent
Estimating the term…
Abstract
A method for quantifying permeability of a vuggy reservoir includes determining a permeability modeled with matrix porosity (K0) of the reservoir, determining a vug porosity (Φvug) of the reservoir, and quantifying permeability (K) of the reservoir as follows: K=aK0·bcΦwg, where a, b, and c are constants.
Claims20
A method for quantifying permeability of a vuggy reservoir, comprising:
- determining a permeability modeled with matrix porosity (K0) of the reservoir;
- determining a vug porosity (Φvug) of the reservoir;
- and quantifying permeability (K) of the reservoir as follows:
- K=aK0·bcΦwg
- where a, b, and c are constants.
A method for quantifying permeability of a vuggy reservoir, comprising:
- identifying a plurality of vuggy and non-vuggy zones in the reservoir;
- obtaining a permeability modeled with matrix porosity for each of the vuggy and non-vuggy zones;
- determining a vug porosity for each vuggy zone;
- and
- for each vuggy zone, boosting the permeability modeled with matrix porosity by a factor proportional to an exponential or the vug porosity for the vuggy zone.
A method for quantifying permeability of a dual-permeability reservoir, comprising:
- determining a permeability modeled with matrix porosity (K0) of the reservoir;
- obtaining a log of the reservoir comprising relative changes in resistivity around a borehole penetrating the reservoir;
- transforming the log into a porosity map of the reservoir;
- estimating a vug porosity (Φvug) of the reservoir from the porosity map;
- and
- quantifying permeability (K) of the reservoir as follows:
- K=aK0·bcΦwg
- where a, b, and c arc constants.
A method for quantifying permeability of a dual-permeability reservoir, comprising:
- determining a permeability modeled with matrix porosity (K0) of the reservoir;
- obtaining at least one description of a total porosity of the reservoir;
- estimating a vug porosity (Φvug) of the reservoir from the description;
- and
- quantifying permeability (K) of the reservoir as follows:
- K=aK0·bcΦwg
- where a, b, and c are constants.
Dependencies are inferred from the claim text.