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US 2013/0096834 A1Published application
Resolution Matched Nonlinear Resolution Enhancement of Well Logs
AssigneeWeatherford/Lamb, Inc.
InventorGuoyu Hu
Life of this patent
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Abstract
A technique for processing well logs performs a nonlinear resolution enhancement of raw well logs. The nonlinear enhancement procedure uses a modified Van Cittert nonlinear enhancement technique that avoids instabilities that can arise using Van Cittert techniques. The nonlinear enhancement can provide resolution matched results at a predetermined resolution.
Claims20
A method of enhancing well logs produced by a well logging tool, comprising:
- receiving raw logging data from the well logging tool;
- calculating a nonlinearly enhanced logging data from the raw logging data, comprising:
- (a) selecting a resolution;
- (b) calculating an estimate of a formation profile;
- (c) calculating a nonlinear forward modeling operator corresponding to the well logging tool;
- (d) calculating an enhancement factor from the raw logging data, the estimate of the formation profile, and the nonlinear forward modeling operator;
- (e) calculating a resolution matched stability factor;
- (f) updating a previous nonlinearly enhanced logging data with the enhancement factor and the resolution matched stability factor to produce the nonlinearly enhanced logging data;
- and
- (g) repeating actions (a), (b), (c), (d), (e), and (f) until a predetermined criterion is satisfied;
- and
- outputting the nonlinearly enhanced logging data.
9 more elements
A non-tangible computer readable medium, on which is stored computer code that when executed causes a computer to perform actions comprising:
- calculating a nonlinearly enhanced logging data from a raw logging data generated by a well logging tool, comprising:
- (a) selecting a resolution;
- (b) calculating an estimate of a formation profile;
- (c) calculating a nonlinear forward modeling operator corresponding to the well logging tool;
- (d) calculating an enhancement factor from the raw logging data, the estimate of the formation profile, and the nonlinear forward modeling operator;
- (e) calculating a resolution matched stability factor;
- (f) updating a previous nonlinearly enhanced logging data with the enhancement factor and the resolution matched stability factor to produce the nonlinearly enhanced logging data;
- and
- (g) repeating actions (a), (b), (c), (d), (e), and (f) until a predetermined criterion is satisfied;
- and
- outputting the nonlinearly enhanced logging data.
8 more elements
A well logging and analysis system, comprising:
- a well logging tool, configured to generate raw well logging data;
- a well log analysis system, comprising:
- a processor;
- an interface, coupled to the processor and communicatively coupled to the well logging tool to receive the raw well logging data from the well logging tool;
- and
- a storage subsystem, coupled to the processor, on which is stored program code that when executed causes the processor to perform actions, comprising:
- calculating a nonlinearly enhanced logging data from the raw logging data, comprising:
- (a) selecting a resolution;
- (b) calculating an estimate of a formation profile;
- (c) calculating a nonlinear forward modeling operator corresponding to the well logging tool;
- (d) calculating an enhancement factor from the raw logging data, the estimate of the formation profile, and the nonlinear forward modeling operator;
- (e) calculating a resolution matched stability factor;
- (f) updating a previous nonlinearly enhanced logging data with the enhancement factor and the resolution matched stability factor to produce the nonlinearly enhanced logging data;
- and
- (g) repeating actions (a), (b), (c), (d), (e), and (f) until a predetermined criterion is satisfied;
- and
- outputting the nonlinearly enhanced logging data.
14 more elements
Dependencies are inferred from the claim text.