1. Fugro, 6100 Hillcroft Ave, Houston, TX 77081, USA. (corresponding author)
2. Imperial College London, Department of Earth Science and Engineering, Exhibition Road, London SW7 2AZ, UK.
3. Equinor ASA, P. O. Box 8500, 4035 Stavanger, Norway.
4. United States Naval Research Laboratory, 1005 Balch Boulevard Stennis Space Center, MS 39529, USA.
5. GeoExpera, Houston, TX, USA.
6. Retired Petroleum Geochemist, 2911 Stonestown Drive Charleston, South Carolina 29414, USA.
7. Oregon State University and NOAA Pacific Marine Environmental Laboratory, Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, OR 97365-5229, USA.