US 12,242,015 B2
Split inversion for nuclear magnetic resonance data
Jie Yang, Houston, TX (US); and Rebecca Corina Jachmann, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Jan. 13, 2023, as Appl. No. 18/154,294.
Prior Publication US 2024/0241283 A1, Jul. 18, 2024
Int. Cl. G01V 3/32 (2006.01); G01N 24/08 (2006.01)
CPC G01V 3/32 (2013.01) [G01N 24/081 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
acquiring nuclear magnetic resonance (NMR) signal data indicating echo signals via an NMR logging tool in a borehole;
generating, based on the NMR signal data, a first vector in which each entry includes a spectrum coefficient associated with the echo signals;
generating a cumulative sum vector in which each entry includes a sum including a spectrum coefficient of a corresponding entry in the first vector plus any spectrum coefficients of any entries that precede the corresponding entry in the first vector;
down sampling the cumulative sum vector to form a down-sampled vector including a subset of the cumulative sum vector;
generating a compressed vector in which each entry includes a difference of a corresponding entry in the down sampled vector and any entry directly preceding the corresponding entry in the down sampled vector; and
transmitting the compressed vector up the borehole over a communication channel.