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US 2011/0218735 A1Published application
Real-Time Lithology and Mineralogy Interpretation
AssigneeBaker Hughes Incorporated
InventorsXiaogang Han, Freddy Enrique Mendez
Life of this patent
Estimating the term…
Abstract
Elemental analysis of an earth formation is obtained using measurements from a gamma ray logging tool. From only the elemental analysis and measurements of porosity, density and natural gamma rays, an estimate of the mineralogy of the formation is made treating the problem as one of minimizing a quadratic objective function subject to equality and/or inequality constraints.
Claims12
A method of evaluating an earth formation, the method comprising:
- making measurements using at least one sensor on a downhole assembly conveyed in a borehole in the earth formation;
- using a processor for:
- estimating, in real time, an elemental composition of the earth formation from the measurements made by the at least one sensor;
- estimating, in real time, a fraction of each of a plurality of mineral constituents that would give the estimated elemental composition;
- and
- conducting further operations using the estimated fraction of each of the plurality of mineral constituents.
3 more elements
An apparatus configured to evaluate an earth formation, the apparatus comprising:
- a downhole assembly configured to be conveyed in a borehole;
- at least one sensor on the downhole assembly configured to make a measurement indicative of an elemental composition of the earth formation;
- at least one processor configured to:
- use the measurement made by the at least one sensor to estimate, in real time, the elemental composition of the earth formation,
- use the estimated elemental composition to estimate, in real-time, a fraction of each of a plurality of mineral constituents that would give the estimated elemental composition;
- and
- conduct further operations using the estimated fraction of each of the plurality of mineral constituents.
4 more elements
Dependencies are inferred from the claim text.