Neural network based well log synthesis with reduced usage of radioisotopic sources
First Claim
1. A computer-implemented method for synthesizing one or more well logs, the method comprising:
- collecting at least one output log of a first well bore from measurements with a radioisotopic source;
collecting at least one input log of the first well bore from measurements by a non-radioisotopic logging tool;
training a neural network via a computer to predict the output log from the at least one input log;
collecting at least one input log of a second well bore from measurements by the non-radioisotopic logging tool; and
processing the at least one input log of the second well bore to synthesize at least one output log of the second well bore.
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Abstract
Logging systems and methods are disclosed to reduce usage of radioisotopic sources. Some embodiments comprise collecting at least one output log of a training well bore from measurements with a radioisotopic source; collecting at least one input log of the training well bore from measurements by a non-radioisotopic logging tool; training a neural network to predict the output log from the at least one input log; collecting at least one input log of a development well bore from measurements by the non-radioisotopic logging tool; and processing the at least one input log of the development well bore to synthesize at least one output log of the development well bore. The output logs may include formation density and neutron porosity logs.
98 Citations
28 Claims
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1. A computer-implemented method for synthesizing one or more well logs, the method comprising:
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collecting at least one output log of a first well bore from measurements with a radioisotopic source; collecting at least one input log of the first well bore from measurements by a non-radioisotopic logging tool; training a neural network via a computer to predict the output log from the at least one input log; collecting at least one input log of a second well bore from measurements by the non-radioisotopic logging tool; and processing the at least one input log of the second well bore to synthesize at least one output log of the second well bore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An information storage medium that, when placed in operable relation to a computer, provides the computer with well log synthesis software comprising:
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a training process that generates a neural network for synthesizing one or more radioisotopic logging tool logs; and a transform process that applies the neural network to convert an input set of non-radioisotopic logging tool logs into an output set of one or more predicted radioisotopic logging tool logs in the form of an observable table or chart. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A system for synthesizing one or more well logs, the system comprising:
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a non-radioisotopic logging tool to obtain measurements in a well bore; and a computer to receive the measurements from the non-radioisotopic logging tool, wherein the computer synthesizes at least one of a density log and a neutron porosity log for display to a user using the measurements from the non-radioisotopic logging tool. - View Dependent Claims (22, 23)
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24. A computer implemented well logging method that comprises:
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obtaining a first log of a well bore by at least one of a resistivity tool and a sonic tool; obtaining a pulsed neutron tool log of the well bore; and using a computer to combine the first log with the pulsed neutron tool log to synthesize and display a radioisotopic source tool log of the well bore. - View Dependent Claims (25, 26, 27, 28)
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Specification