Recent Developments in Guijarral Hills Field: ABSTRACT

Abstract

The Guijarral Hills field is one of several large stratigraphic oil fields on the prolific Coalinga anticline. Within and adjacent to the field five new pools have been discovered in the past 2 years, all of them stratigraphic in nature. The two most important of these new pools are the North Leda and the Bourdieu. The North Leda pool embraces 600 acres with 37 wells currently producing 6,800 barrels per day. The producing zone is in the Leda sand of lower Miocene age at an average depth of 8,750 feet. Only the westerly updip pinchout line in the gas-cap area remains undefined. The Bourdieu pool is in the Polvadero area southeast of the main Guijarral Hills pool. Production is from the Gatchell sand of middle Eocene age at depths ranging from 10,550 feet to 10,965 feet. To date, eight wells have been completed on a 20-acre spacing pattern, proving about 200 acres. Current production averages about 500 barrels per day per well under restriction. Field limits have been established only in a westerly direction although a recent test well 1½ miles north of the present limits was a failure. Neither bottom water nor edge water has been encountered to date. These two new-pool discoveries have added a substantial reserve to the Guijarral Hills field. End_of_Article - Last_Page 434------------