An increase in drilling took place in 1956. The over-all percentage of successful wells was about the same as the previous year. Frio and Yegua formational trends had the largest number of wells in 1956. An increase in drilling was also noted on the Continental Shelf.
Less oil and condensate was produced than in the previous year but gas production was higher.
Thirty-four new oil and gas fields were discovered in 1956 of which half were oil and half were gas discoveries. Fault-line closures accounted for most of the discoveries.
Exploration increased slightly during the year. Gravimeter work showed the greatest gain among various prospecting tools. Exploration and drilling during 1957 should continue to center along the Frio and Yegua trends although other trends will receive increasing interest.