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• Spud-year counts use each registry record with a source spud date; records without one are excluded and counted separately. The year containing a catalogue snapshot date is partial; later years are not covered.
• Measured-depth quantiles are per catalogue and spud year, linear interpolation (type 7), on the first reported measured depth in metres with its source reference level unchanged.
• Production lifecycle values use SODIR net oil equivalents in million Sm3. Rolling 12-month sums require 12 consecutive unflagged months; cumulative sums exclude flagged months. Periods incomplete at source access are excluded.
• Produced water share = produced water / (produced water + gross oil) over the latest valid 12-month window, standard volumes; shown only when gross oil is positive.
• Bottom-hole temperatures are SODIR-reported values at true vertical depth below RKB; correction method is not stated. Log temperatures can underestimate formation temperature.
• Heat-flow values are IHFC parent-level site values in mW/m2 with verbatim quality scores. Distance to a heat-flow site is context, not a measurement at a well.
• Brent values are EIA annual averages in nominal USD per barrel. Correlations with drilling counts are descriptive and do not establish causation or forecast skill.

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