ABSTRACT
The Texas Company completed “Westpet” No. 1, a 77 location in Sec. 29, T. 30 S., R. 22 E., M.D.B.&M., on October 22, 1946, for the first deep-zone production on the Belgian anticline. This discovery well was completed from the top 30 feet of the Oceanic sand, Refugian (Oligocene) in age, penetrated at 5,143 feet. The initial flow test produced gas and condensate at 140 barrels per day rate, 72° gravity, 16/64–inch bean, and 2,230 MCF gas. Six feet of Phacoides oil sand, at 4,995–4,961 feet, was left behind the pipe.
Since this discovery, 5 years of exploration drilling by The Texas Company, Pacific Western Oil Corporation, Tide Water Associated Oil Company, Trico Oil and Gas, and The Ohio Oil Company have resulted in drilling 42 test wells and three non-productive redrill holes to evaluate approximately 1,530 acres. As of September 15, 1951, there were 25 wells producing either gas or light-gravity oil, 15 dry holes, and one abandoned producer. This low exploration and development ratio of 5:3 reflects the complexity of the geology and structure of the Belgian Anticline field.
The structure, essentially, is a southeast-plunging anticline. The north flank has been shoved over by a series of northwest-southeast-trending south-dipping thrust faults. This asymmetric fold has been broken into a complex fault block pattern by the combination of both high-angle thrusts and normal cross faults. Three principal unconformities truncate the structure from east to west: one at the base of the Miocene (lower Zemorrian-Salt Creek shale), another at the base of the Saucesian, and the third at the base of the middle Miocene (Gould shale).
Production has been established from the Eocene Point of Rocks sand, the only blanket sand across the structure, the Oligocene Oceanic sand, the major productive sand of the field, and from the Miocene lower Zemorrian Phacoides sand, the uppermost productive zone. Production from the Oceanic sand has been established from drill depths ranging from 4,480 to 6,055 feet. The Carneros sand and the fractured upper Miocene shale as yet have not been productive.
