For a rough estimate about emissions factors related to fossil fuels (oil, gas and coal) you can use the estimate of "Statistical Review of World Energy 2013" of BP (http://www.bp.com/en/global/corporate/about-bp/statistical-review-of-world-energy-2013.html)

However, these are for conventional fuels, if you want to assess also unconventionals you would need to make a deeper research. I recommend [Koppelaar 2009] (http://www.peakoil.nl/wp-content/uploads/2009/05/april_2009_less_oil_more_co2_aspo_netherlands.pdf)

good luck! hope it helps,

iñigo

Iñigo:

Thanks for your reply.

I'll check the links suggested.

You helped me a lot.

Regards,

Dagoberto Port

You can also try CETESB, Brazilian report for São Paulo State

http://www.cetesb.sp.gov.br/inventario-gee-sp/inventario-esp/282-1st-direct-and-indirect-greenhouse-gases-anthropogenic-emissions-inventory-of-sao-paulo-state

also available in english

Gabriel:

Obrigado pela sugestão.

SDS

Dagoberto Port

Dear Dagoberto

this link can be usefully for future conversions

http://www.ghgprotocol.org/calculation-tools

best regards

Gabriel Ribeiro