Very important effort here. Some relevant sources for oil and gas follow.
For upstream oil emissions, our Science article and associated supplemental information contains data for most global oil fields (98% of 2015 production), though it may not have the precise data on ownership required for your effort.
Masnadi, et al. 2018. "Global carbon intensity of crude oil production." Science. vol. 361, no. 6405. pp. 851. [science.sciencemag.org/content/361/64…]
Supplemental materials here: science.sciencemag.org/content/suppl/…
Emissions for oil in particular are much more than just those related to combustion, they also include upstream discovery and extraction, midstream refining, and transportation to end-users.
When we looked at total life cycle emissions for oil on a per barrel basis, we found differences big enough to matter. Summary and context here:
Koomey, Jonathan, Deborah Gordon, Adam Brandt, and Joule Bergeson. 2016. Getting smart about oil in a warming world. Washington, DC: Carnegie Endowment for International Peace. October 5. [carnegieendowment.org/2016/10/04/get…]
More big picture context here: Brandt, Adam R., Mohammad S. Masnadi, Jacob G. Englander, Jonathan Koomey, and Deborah Gordon. 2018. "Climate-wise choices in a world of oil abundance." Environmental Research Letters. vol. 13, no. 4. 2018/04/01. pp. 044027. dx.doi.org/10.1088/1748-9…
For refining, see Jing, et al.. 2020. "Carbon intensity of global crude oil refining and mitigation potential." Nature Climate Change. vol. 10, no. 6. 2020/06/01. pp. 526-532. [doi.org/10.1038/s41558…]
The 2nd iteration of our oil climate index giving total lifecycle emissions per barrel of oil is here: oci.carnegieendowment.org
Working on the third iteration (called OCI +), incorporating updated data as well as some data on gas. Beta site here: dxgordon.github.io/OCIPlus/
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