It looks like the plot of production against gas/oil ratio is a useful predictive tool in the Permian Basin. Once drilling has largely stopped in a county, a rapid increase in the gas/oil ratio indicates that the oil production will start falling away. Does this relationship also hold true for the Eagle Ford Formation? It doesn’t look like it. Karnes County has the highest rate of oil production from the Eagle Ford in Texas:
Production peaked 10 years ago but hasn’t fall much since. In energy equivalent terms, total energy produced has gone sideways:
After Karnes County comes De Witt County:
Oil production down to a quarter of its peak ten years ago but the oil/gas ratio has not blown out.
Once again, total energy production has been flat for the last five years as gas production increased. After De Wiit County is La Salle County:
Oil production has halved over the last 10 years but the gas/oil remains unchanged. Total energy production is not far off that peak due to an increase in gas production from 2017:
After Las Salle County comes McMullen County:
Oil production has halved over the last 10 years but the gas/oil remains unchanged. Over the last three years the gas production increase has offset the oil production decline in energy content terms. It looks like relatively dry gas has been developed downdip from the Eagle Ford in the oil window:
Next is Gonzales County:
Oil production from Gonzales County has also halved over the last ten years while gas/oil ratio is hardly different from its peak.
It looks like production from Gonzales County is nearly all from the Eagle Ford in the oil window with the downdip overmature section to the south in De Witt County:
All in all, it looks like the Eagle Ford is getting a second wind from gas wells drilled to supply the toll-treating LNG plants along the coast. These gas producers will get close to the oil price in energy content terms. While Marcellus production in Appalachia looks like it has peaked and is rolling over, gas production from Texas might increase for a while yet:
Beaucoup de travail et très intéressant.