Method and apparatus for determining aluminum concentration in earth formations
AssigneeBaker Hughes Incorporated
InventorsRichard Pemper, Pingjun Guo
Life of this patent
Estimating the term…
Abstract
Elemental analysis of an earth formation (including Aluminum) is obtained using measurements from a gamma ray logging tool. The inelastic spectrum of Aluminum is determined from measurements made in a water tank. From the elemental analysis, an estimate of the mineralogy of the formation is made treating the problem as one of Linear Programming (maximizing an objective function subject to equality and/or inequality constraints.
Claims24
A method of analyzing an earth formation, the method comprising:
- a) conveying a tool in a borehole in the earth formation;
- b) pulsing the formation with radiation from the tool;
- c) detecting gamma rays resulting from interaction of the pulsed radiation with a plurality of elements in the formation, the plurality of elements including Aluminum (Al);
- and
- (d) estimating from a determined spectrum of the gamma rays an elemental concentration of Al and at least one additional element.
An apparatus for evaluating an earth formation, the apparatus comprising:
- a) a tool conveyed in a borehole in the earth formation, the tool including:
- (A) a radiation source which pulses the earth formation with radiation, and
- (B) at least one detector which detects gamma rays resulting from interaction of the radiation with a plurality of elements including Aluminum (Al);
- and
- (b) a processor which:
- (C) determines a spectrum of the detected gamma rays, and
- (D) estimates from the determined spectrum an elemental concentration of Al and at least one additional element.
A computer readable medium used with an apparatus fo evaluating an earth formation, the apparatus comprising:
- a) a tool conveyed in a borehole in the earth formation, the tool including:
- (A) a radiation source which pulses the earth formation with radiation, and
- (B) at least one detector which detects gamma rays resulting from interaction of the radiation with a plurality of elements including Aluminum (Al);
- the medium comprising instructions which enable a processor to
- (b) determine a spectrum of the detected gamma rays;
- and
- (c) estimate from the determined spectrum an elemental concentration of Al and at least one additional element from the plurality of elements.
Dependencies are inferred from the claim text.