Mesaverde Conventional Oil and Gas50370501

Volumes of Discovered Petroleum

[MMBO, million barrels of oil. BCFG, billion cubic feet of gas. MMBNGL, million barrels of natural gas liquids. Oil accumulations containing less than0.5 MMBO or gas accumulations containing less than 3 BCFG were not considered in the assessment. Accumulations were classified as oil or gas by the

USGS. Accumulations without reported discovery dates were not included. NA means not applicable and is shown for volumes where an insufficientnumber of accumulations are present. Calculated values may not be equal to the sums of the component values because numbers have been

independently rounded.]

Accumulation Known (Discovered) Volumes Grown (Discovered) VolumesType Number Number

of Accums. Oil (MMBO) Gas (BCFG) NGL (MMBNGL) of Accums. Oil (MMBO) Gas (BCFG) NGL (MMBNGL)

Oil Accums. 2 64 203 7 2 79 251 8Gas Accums. 11 0 1,173 18 12 0 1,364 20Accums. <0.5

MMBOE 2 0 4 0 1 NA NA NA

All Accums. 15 64 1,380 24 15 NA NA NA

Mesaverde Conventional Oil and Gas50370501

Discovery-History Sequence

[MMBO, million barrels of oil. BCFG, billion cubic feet of gas. Oil accumulations containing less than 0.5 MMBO or gas accumulationscontaining less than 3 BCFG were not considered in the assessment. Accumulations were classified as oil or gas by the USGS. The first

half or third shows year of first accumulation discovery as well as end of period. NA means not applicable and is shown where an insufficientnumber of accumulations are present. Calculated values may not be equal to the sums of the component values because numbers have

been independently rounded.]

Discovery-History Sequence - Known (Discovered) VolumesAccumulation

Type Year Number of Total Mean Median(End of Period) Accumulations Volume Size Size

Oil Accums. Known Sizes (MMBO)First half 1959 1 NA NA NASecond half 1959 1 NA NA NA

All Oil Accums. 2 64 32 32Gas Accums. Known Sizes (BCFG)

First half 1959 6 1,105 184 147Second half 1972 5 67 13 9

All Gas Accums. 11 1,173 107 27

Mesaverde Conventional Oil and Gas50370501

Discovery-History Sequence

[MMBO, million barrels of oil. BCFG, billion cubic feet of gas. Oil accumulations containing less than 0.5 MMBO or gas accumulationscontaining less than 3 BCFG were not considered in the assessment. Accumulations were classified as oil or gas by the USGS. The first

half or third shows year of first accumulation discovery as well as end of period. NA means not applicable and is shown where an insufficientnumber of accumulations are present. Calculated values may not be equal to the sums of the component values because numbers have

been independently rounded.]

Discovery-History Sequence - Grown (Discovered) VolumesAccumulation

Type Year Number of Total Mean Median(End of Period) Accumulations Volume Size Size

Oil Accums. Grown Sizes (MMBO)First half 1959 1 NA NA NASecond half 1959 1 NA NA NA

All Oil Accums. 2 79 39 39Gas Accums. Grown Sizes (BCFG)

First half 1959 6 1,274 212 170Second half 1996 6 90 15 8

All Gas Accums. 12 1,364 114 21

Chapter 28