Erratumto:Identi fi cationofreservoirfracturesonFMIimagelogsusingCannyandSobeledgedetectionalgorithms E E

Oil & Gas Science and Technology - Rev. IFP Energies nouvelles76, 10 (2021)–https://doi.org/10.2516/ogst/2020086

Erratum to: Identi fi cation of reservoir fractures on FMI image logs using Canny and Sobel edge detection algorithms

Mina Shafiabadi, Abolghasem Kamkar-Rouhani^*, Seyed Reza Ghavami Riabi, Amin Roshandel Kahoo, and Behzad Tokhmechi

School of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran

Accepted: 13 April 2021

Regarding the article “Identification of reservoir fractures on FMI image logs using Canny and Sobel edge detection algorithms, Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles 76, 10 (2021) – https://doi.org/10.2516/ogst/

2020086”, published February 2nd, 2021, the authors have noticed that several errors occurred:

Equation (2)should read:

r²f x;ð yÞ ¼@²fðx;yÞ

@x² þ@²fðx;yÞ

@y² instead of:

r²f xyð Þ ¼@²fðxyÞ

@x² þ@²fðxyÞ

@y² Equation (5)should read:

/ðx;yÞ ¼arctanðGx=GyÞ instead of:

/ðx:yÞ ¼arctanðGx=GyÞ Equation (7)should read:

NLMðI qð ÞÞ ¼X

8qg

w p;ð qÞI qð Þ

instead of:

NLMðI qð ÞÞ ¼X

8qg

w p:qð ÞIðqÞ

Equation (8)should read:

0w p;ð qÞ 1;X

8qg

w p;ð qÞ ¼1

instead of:

0w p:qð Þ 1:X

8qg

p:q ð Þ ¼1 Equation (9)should read:

w p;ð qÞ ¼ 1 z pð Þe

d p;ð qÞ h²

instead of:

w p:qð Þ ¼ 1 zðpÞe

d p:qð Þ h²

Equation (10)should read:

z pð Þ ¼X

8q

e

d p;ð qÞ h²

instead of:

z pð Þ ¼X

8q

e

d p:qð Þ h²

Erratum for: Oil & Gas Science and Technology - Rev. IFP Energies nouvelles 76, 10 (2021) –https://doi.org/10.2516/ogst/2020086 Oil & Gas Science and Technology–Rev. IFP Energies nouvelles76, 33 (2021) Available online at:

ÓM. Shafiabadi et al., published byIFP Energies nouvelles, 2021 ogst.ifpenergiesnouvelles.fr https://doi.org/10.2516/ogst/2021023

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* Corresponding author:[email protected]

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