## Errata Petroleum Geophysics 1st edition

"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair."* *Douglas Adams, Mostly Harmless.

Errors you find, or we find ourselves, are immediatly correct in GeoCLASS and they will be corrected in future editions of Petroleum Geophysics. Below is a list of errors found in the 1st edition of Petroleum Geophysics (ISBN-978-82-93099-00-0):

Elastic waves:

- Page 13: In left column, by convention, elongation should yield negative and compaction positive strain.

- Page 13: In the caption of the first graphic in the right column, it should say ... = γ/2, and not ... = g/2.

- Page 17: Equation 1.5.1 should be μ = E / 2(1 + ν) as in equation 1.3.2, and not μ= E / 2(1 + 2ν).

- Page 33: Equation 4.4.1 should be the same as eq. 2.1.1. Equation 4.4.3 should be eq. 4.4.1.

- Page 31: Equation 4.2.2 should be

- Page 33: Equation 4.4.1 should be

Basic Seismic Signal Theory and Processing:

- Page 179: In the figure, the order of shot 1, 2, 3, etc under Gathered traces should be reveresed, i.e. the bottom trace is for shot 1 and the above is shot 2, etc.

- Page 201: The equation reference in top right column should be to 3.2.2, not 4.3.2.

Seismic Acquisition:

- Page 139: The graphs in the image are wrong, and the image should be like this

Seismic Attributes:

- Page 400: Equation 3.12.1 should be

- Page 400: The word "neglecting" should be replaced with "approximating" under equation 3.12.1

- Page 400: The text "Lambda-Rho" and "Mu-Rho" should be "λ-ρ" and "μ-ρ".

- Page 400: The caption should say: "Crossplot of μ-ρ and λ-ρ. Note the orthogonal seperation of lithologies".

- Page 401: The caption under the first figure should say: "Crossplot of μ-ρ and λ-ρ. Note the orthogonal seperation of lithologies".

- Page 414: The figure and equation in top right column should be

- Page 414: The text before equation 4.4.1.1 should say: "Consider the volume element and state Newton's second law and divide by its volume".

- Page 414: Equation 4.4.1.1 should be

- Page 415: Equations 4.4.2.3, 4.4.2.4 and 4.4.2.5 should be

- Page 416: The geophone equation should be

Rock Physics:

- Page 444: ρ in the figure on the right should be φ, making the figure look like this

- Page 469: The caption of the figures in right column should be switched.

- Page 479: In the left column line four it should be iso-stress not iso-strain.

- Page 496: In the left column line 2 it should say f < 1/(4τeq).

- Page 497: In the right column line 2 it should say < 1/(4τeq).

- Page 537: The less than symbol in equation 7.8.1 and 7.8.2 should be greater than.

- Page 551: Equations 7.20.1 and 7.20.2 should be

- Page 551: The equation reference in the caption should be 7.20.1 and 7.20.2, not 7.21.1 and 7.21.2.

Reservoir Monitoring:

- Page 632: Equation 4.11.1 should be

- Page 632: Equation 4.11.3 should be

- Page 637: The text 'span class="scalar">' should not be present in the last paragraph of left column.