The gases display a trend of becoming isotopically heavier (delta 13 C 1 values range from -48.7 to -31.4 per mil) and chemically drier (C 1 /C (sub 1-5) values range from 0.75 to 0.99) with increasing depth. The gases also become isotopically heavier and chemically drier to the northeast, following a trend of increasing maturity.--Modified journal abstract.

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