Does anyone know the full bibliographic reference of Clavier (1971)?
He proposed an equations to calculate a non-linear volume fraction of shale from the linear gamma-ray index (IGR) in the form of:
VSH_red = 1.7 * (3.38 - (IGR + 0.7)^2)^1/2
The author must have worked for Schlumberger, but I neither found hints in the bible (Serra, 1984, 1986) nor in the Schlumberger log chart from 2009.
keyword: well-log interpretation
How about this:
Clavier, C., Hoyle, W., & Meunier, D. (1971, June 1). Quantitative Interpretation of Thermal Neutron Decay Time Logs: Part I. Fundamentals and Techniques. Society of Petroleum Engineers. doi:10.2118/2658-A-PA
Here is the URL: https://www.onepetro.org/journal-paper/SPE-2658-A-PA
Thanks James, yes, but this is not the original work, I guess? In this paper Clavier showed a graphical interrelation between vsh and gr deflection without reporting the specific, above mentioned equation. Or did I miss something? Does you (or someone else) know where this relation was initially published?
21.11.17
Christian Clavier was a longtime Schlumberger-Doll and Houston Technology center employee. Schlumberger employees worked in teams, so the parentage of individual algorithm tends often to be rather hazy.
If you do a OnePetro search on Clavier you may find the initial paper. I think the one you want is the "SARABAND" paper which was presented at both SPE and SPWLA annual meetings, in the early 1970's. Also check out the SPE & SPWLA "Shay -Sand" reprint volumes.
All Vsh estimates are imperial. The SARABAND paper describes several.
Also Paul Worthington did a Shaly-Sand review, in the 1990s, which may also have the original Clavier
Donald G. Hill, PhD
Consulting Petrophysicist
Dear Donald, thanks for sharing some background information. I followed your recommendations and have screened lots of paper, but didn't find the original data anywhere. However, I found instead some interesting paper that critically reviewed the Clavier equation. :=)
So, from my point of view, it was worth to spent some time in any case, although I did not reveal the original publication of this formulae.
22.11.17
Sven,
As I indicated, in my first response, parentage of Schlumberger algorithms is often hazy and hidden in internal documents. I was on travel, but am back in my office. the "SARABAND®' PAPER IS:
Poupon, A., Clavier, C., Dumanoir, J., Gaymard, R., and Misk, A., 1970, “Log Analysis of Sand-Shale Sequences – A Systematic Approach”, Journal of Petroleum Technology, vol. 22, No. 7 (July), pp. 867 – 881.
This was one of the first Schlumberger Computer aided FEE papers and used the Simandoux Shaly-Sand Sw algorithm.
Donald G. Hill, PhD
Consulting Petrophysicist