English to Spanish Other Petroleum Eng/Sci Statistics

There exists an average time difference, Δt, between the date of discovery and the
date of production of a barrel of oil, and this difference can be estimated based on
discovery curves and production curves (Δt is not constant over time and
technological progress has an influence). The curve representing discoveries in a
given basin as a function of time generally has the shape of bell curve. The curve
representing production has a similar shape but is shifted in time, from 10 to 30 years
depending on the basin. This phenomenon reflects the fact that the effectiveness of
exploration initially increases then decreases (an S, or so-called “creaming,” curve).