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Abstract

Pinedale field, located in Sublette County, Wyoming, is one of the largest natural gas fields in the United States. The discovery and commercialization of this field covers a period of nearly 60 years. During this time, many different companies and people were involved in bringing Pinedale to the point of commercial production. The field produces from the Upper Cretaceous Lance Formation on the Pinedale anticline. The Lance Formation is a series of stacked sandstones interbedded with siltstone, mudstone, and shale. The sandstones typically average about 7% porosity with permeabilities in the single-digit micro-Darcy range. In much of the Pinedale field, the Lance reservoir section is over 5500 ft (1700 m) thick, and it is typically overpressured throughout the section. The commercialization of the field was made possible through the convergence of a better understanding of the geology of the reservoir rocks and the nature of the field’s structure as revealed through the use of modern three-dimensional (3-D) geophysical data. This understanding permitted the development and utilization of modern drilling and completion practices that were developed during the drilling of the adjacent Jonah field and that continue to evolve today.

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