This might or might not help:

https://www.facebook.com/772077446151471/videos/vb.772077446151471/621439107916512/?type=2&theater

thank you MR.Manner, this video explaines how is the sonic technology works, but what i'm looking for is the equation to transforme sonic data into TOC contentent in shale formatation, as schlmbergie company uses.

The short answer is that you cannot tell the quality (C,H,S,N, SG etc) of an oil with any certainty from a sonic data. However if you have sonic data from other fields that have been developed you can compare and assume that the quality of the new field is similar to the quality of developed fields with similar sonic data. In order to make this comparison you will need a large amount of sonic data. If you don’t have your own data. Schlumberger come to mind as the company most likely to have this type of data. Yojgawa’s KBC/Feesa group also has a access to a large amount of sonic data that the use for flow assurance calculations Here is a link to a prestation about their flow assurance software Maximius https://www.youtube.com/channel/UCQapDZ7YfrCivRHtDDQH0gg

interesting information about oil production but it is not directly related to your question.. FEESA may be able to help you but I don’t believe this is a current offering.

In any event this will only be an estimate you will need to do one or more proper assay of the oil field to now crude quality with any level of certainty.

this answer was really halpful it opnes to me a new ways of thinking.

Thanks,  I am glad it was helpful.  Let me know if you need any additional information or clarifiction.

Reference:

Methods of Calculating Total Organic Carbon from Well Logs and its Application on Rock’s Properties Analysis

S.Z. Sun et al., 2014 , AAPG

Here is a link to the article correlating TOC from ell log data.

http://cseg.ca/assets/files/resources/abstracts/2013/281_GC2013_Quantifying_Total_Organic_Carbon.pdf

It is just a correlation based on fairly limited data but if it is all you have and it lets you move forward ith your work go  ahead and use it

that's exactly what i am using "Passey method", it gives the best correlation among all other methodes.

TOC may not be possible to be calculated directly from Sonic Log. How can acoustic impedance help in deciding Total Organic content?It may give velocity or slowness.