Abstract
A total of 1,758 wells was drilled in South Texas during 1970, compared with 2,051 in 1969. Exploration drilling was 13.8% successful, down from 23.9% in 1970. Seismic activity decreased 10.1%. Activity increased in all trends except the Oligocene-Miocene and offshore. Drilling in the Paleozoic trend continued, but was unsuccessful. The Jurassic trend was dormant. Exploratory drilling for the Sligo Formation (Lower Cretaceous) continued with 1 discovery. Completions from the San Miguel sandstones (Upper Cretaceous) were among the most significant discoveries during the year. Development and expansion of Vicksburg gas production in Hidalgo County dominated the Oligocene-Miocene trend exploratory efforts.
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