The basin accounts for two-thirds of Pemex output and the average production level in the first half was 2.09Mb/d.
The basin contains the Cantarell area - made up of six fields - that accounts for nearly half of Pemex's overall crude production, but which is in a stage of natural decline.
Crude production at the Cantarell complex in 1H07 averaged 1.58Mb/d, with levels falling to 1.57Mb/d in June from 1.59Mb/d in January, according to the figures.
Pemex hopes the Ku-Maloob-Zaap (KMZ) project will continue to help offset Cantarell's decline.
The KMZ fields' combined output in June was 510,556b/d, up 19.3% from its January level of 426,440b/d.
The average KMZ production level in 1H07 was 468,943b/d.
The number of oil and associated gas wells in production on the Cantarell complex fell to 213 in June from 227 in April and 223 in January. By comparison, KMZ had 82 wells in production in January, and 95 in June.
The average production of all other fields in the basin in 1H07 was 42,810b/d.
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