Adaptive t1/t2 ratio selection for optimal compression
AssigneeHalliburton Energy Services, Inc.
InventorsRebecca JACHMANN, Jie YANG, Pierre AERENS
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Abstract
Systems and methods for compressing nuclear magnetic resonance (NMR) data are disclosed. The methods include the steps of selecting a T1/T2 ratio value, inverting a first portion of the echo train data using the selected T1/T2 value, and reconstructing the inverted echo train using the selected T1/T2 value. A quality measure is calculated based on a comparison of the reconstructed echo train to the original echo train. When the quality measure is satisfactory, the NMR data is inverted using the selected T1/T2 value and transmitted to the surface.
Claims18
A method of compressing nuclear magnetic resonance (NMR) data, comprising steps:
- (a) acquiring NMR data;
- (b) acquiring an echo train having a plurality of echo values;
- (c) selecting a T1/T2 ratio value;
- (d) inverting a first portion of the echo train using the selected T1/T2 value;
- (e) reconstructing the inverted echo train using the selected T1/T2 value;
- (f) determining a quality measure based in part on a comparison of the reconstructed echo train to the original echo train;
- and
- (g) inverting and compressing, based on a comparison of the quality measure to a threshold, a second portion of the acquired plurality of echo trains using the selected T1/T2 value.
A system for compressing nuclear magnetic resonance (NMR) data, comprising:
- a processor;
- a memory coupled to the processor and containing instructions that, when loaded into the processor and executed, cause the processor to execute steps:
- (a) acquiring NMR data;
- (b) determining an echo train having a plurality of echo values;
- (c) selecting a T1/T2 ratio value;
- (d) inverting a first portion of the echo train using the selected T1/T2 value;
- (e) reconstructing the inverted echo train using the selected T1/T2 value;
- (f) determining a quality measure based in part on a comparison of the reconstructed echo train to the original echo train;
- and
- (g) inverting and compressing, based on a comparison of the quality measure to a threshold, a second portion of the acquired plurality of echo trains using the selected T1/T2 value.
A memory containing instructions for compressing nuclear magnetic resonance (NMR) data that, when loaded into a processor and executed, cause the processor to execute steps:
- (a) acquiring NMR data;
- (b) determining an echo train having a plurality of echo values;
- (c) selecting a T1/T2 ratio value;
- (d) inverting a first portion of the echo train using the selected T1/T2 value;
- (e) reconstructing the inverted echo train using the selected T1/T2 value;
- (f) determining a quality measure based in part on a comparison of the reconstructed echo train to the original echo train;
- and
- (g) inverting and compressing, based on a comparison of the quality measure to a threshold, a second portion of the acquired plurality of echo trains using the selected T1/T2 value.
Dependencies are inferred from the claim text.