Exploration in Pennsylvania during 1964 resulted in the discovery of 2 new fields, 1 new pool, and 3 deeper pools. Production from these discoveries is from deep (Middle Devonian or older) gas-producing formations. Deep development drilling reached an all, time high in Erie and Crawford Counties, where 91 wells were drilled during the year.

Development drilling in the shallow fields was concentrated in the Warren-Youngsville and Pleasantville-Tionesta oil areas, and in the Armstrong, Indiana, and Jefferson County gas areas.

There were 938 new wells drilled and 27 wells deepened during 1964. This is an increase of 34 per cent over the 700 drilled in 1963. Of the 938 new wells, 911 were in proved fields, and 27 were exploratory tests. Of the 911 proved field wells, 619 were drilled exclusive of underground gas storage and secondary recovery projects, 278 wells in secondary recovery projects, 13 wells in gas storage, and 1 well for waste disposal. Of the 619 development wells excluding secondary recovery projects, 274 were gas wells, 242 oil wells, and 103 dry holes. The total footage drilled during the year was 2,199,863 ft.

Exploratory tests totaled 27, drilling a total of 174,906 ft. of hole. Of the 27 exploratory tests, 6 were successful, and 21 were dry, giving a success ratio of 1 in 4.5.

Oil pipeline runs totaled 5,113,000 bbls. of crude oil which is more than the 1963 production of 5,014,000 bbls. Proved oil reserves as of December 31, 1964, were estimated at 86,720,000 bbls. Gas produced totaled 85,322,000 Mcf, compared with 92,340,000 Mcf in 1963. Gas reserves were estimated at 1,243,575,000 Mcf at the end of the year. The total reservoir capacity for the storage of natural gas in Pennsylvania is 521,514,000 Mcf.

Seismic crews logged 101 weeks during the year. This is an increase of about 11 per cent over the seismic activity in 1963. No gravity work was done but geological field parties were active.