The natural gas of Wenliu gas pool in Dongpu depression

Henan Provin-ce

is considered to be originated from coal series of Permo-Carboniferous.The reservoir rocks are Lower Tertiary sediments.Methane contents of the gas is 95.12%

the ratio of C

2-4

alkane to C

1-4

alkane is 3.84%

condensate is22.98g/m

3

.The average value of Ar

40

/Ar

38

is 1

231

much greater than thatof oil field gas in the same system of this same depression(441 for the oil-field gas)whereas δ

13

C-average value of methane is -28.16‰

which is 12.86‰ higher than that of the above mentioned oilfield gas

δD value is -182‰

Hg is 5.11×10

4

ng/m

3

.δ

13

C-value of the accompanying condensate is -24.5‰

while paraffin in-dex is 8.09

heptane value 41.76%

benzene 11.04%

methylbenzene 5.94% and its peak carbon mumber is C

11

or C

13

Pr/Ph is 0.77.