| abstract |
A family of organic tracers is proposed for inter-well measurement of residual oil in petroleum reservoirs, as is their use as partitioning tracers in a petroleum reservoir. The tracers consist of at least one benzyl alcohol of formula i) wherein each of R 1 to R 5 is independently selected from H, F, CI, Br, I, CF 3 CF 2 CI, CFCI 2 and CCI 3 and wherein at least one of R 1 to R 5 is not H. |