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As shown for Karnes county in the chart below, the county’s December 2012 oil production share did not change as much as its oil production level across release dates.
To summarize, the TRRC's reported level of oil and natural gas production undergoes substantial upward revisions across release dates, but a given county’s share of total production in the Texas portion of the shale formation does not change as much.
While the level of oil and natural gas production reported by the TRRC changes significantly across release dates, a county’s share of Texas production in the shale formation is more stable.
To compute a county’s share of Texas production in the shale formation at any release date, the county’s level of production as reported in a given release is divided by the sum of production across all the Texas counties in the shale formation.
Nonetheless, the OCD incorporates its revisions more quickly than its Texas counterpart, the Texas Railroad Commission (TRRC).
To minimize the magnitude of these revisions, statewide production data for the Haynesville is also reported quarterly and with a lag.The following table summarizes the sources for these data.The Eagle Ford Shale and the Barnett Shale both lie entirely within Texas.To clarify the methodology, the table below illustrates the computations for second quarter 2013.  This is the sum of production across all of the parishes in the Haynesville shale.This includes Caddo (600.2), Bienville (299.6), Bossier (473.2), Claiborne (41.7), Desoto (2,354.4), Red River (815.0), Webster (90.7), Sabine (405.8), Natichoches (19.0) and Union (12.2) parishes.