Introduction: Jonah Field—Case Study of a Tight-gas Fluvial Reservoir
J. W. Robinson, K. W. Shanley, 2004. "Introduction: Jonah Field—Case Study of a Tight-gas Fluvial Reservoir", Jonah Field: Case Study of a Tight-Gas Fluvial Reservoir, John W. Robinson, Keith W. Shanley
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A core workshop entitled Tight-gas Fluvial Reservoirs: A Case History from the Lance Formation, Green River Basin, Wyoming, was held in conjunction with the 2001 AAPG Annual Meeting in Denver, Colorado. As part of that short course, a book containing nine chapters, totaling almost 200 pages, was distributed to participants. In 2002, the editors proposed to AAPG and the Rocky Mountain Association of Geologists (RMAG) an opportunity to copublish a Studies in Geology volume with a larger group of papers that would have broad appeal to geoscientists and engineers working in tight-gas fluvial reservoirs.
Jonah field is the largest natural gas discovery in the onshore United States in the last 10–15 yr. Recoverable reserve estimates range from 8 to 15 tcf, depending on the method of analysis. By virtue of being a tight-gas reservoir, it is, in many respects, a nontraditional field. According to many of the recent U.S. and world resource assessments, most of the future gas resources will come from tight, low-permeability sandstones in the deeper portions of basins.
The intent of this volume is twofold: (1) to provide readers with previously unpublished or proprietary data on the field, and (2) to integrate all aspects surrounding the field including geology, geophysics, reservoir engineering, drilling and completion, and regulatory affairs. As such, this volume is a definitive collection that provides a truly integrated perspective of this giant field. The list of topics addressed in this book is by no means complete; however, it does encompass the comprehensive field description
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The discovery of a giant natural gas field within a mature petroleum province is a significant event. Understanding the factors that control such an accumulation is important if the oil and gas industry is to continue to develop natural gas resources. Jonah field, in the Greater Green River basin of southwest Wyoming, is the largest natural gas discovery in the onshore United States in the last 10-15 years with recoverable reserves ranging from 8 to 15 tcf natural gas. Since beginning widespread field development in August 1992, Jonah has produced approximately 1 tcf gas, 10.3 million barrels of oil, and 3.7 million barrels of water. Field production is still increasing with daily production presently at 666 MMCFGPD, 5800 BOPD, and 4000 BWPD from approximately 600 wells. Active drilling continues within the field as operators consider widespread downspacing. By virtue of being a tight-gas field, Jonah is, in many respects, nontraditional. Recent assessments of natural gas potential, for both the U.S. and the world, strongly suggest that most future gas resources will come from low-permeability sandstones in the deeper portions of sedimentary basins, and from fields that will undoubtedly share characteristics with Jonah. The subtle structure, the low-permeability nature of the reservoir, the challenging petrophysics, and the environmental sensitivity surrounding Jonah may foreshadow what explorationists have to look forward to as the demand for natural gas increases, not only in the United States, but throughout the world. This volume brings together previously unpublished material on Jonah field and attempts to integrate all aspects including geology, geophysics, reservoir engineering, drilling and completion, and regulatory affairs. As such, this is a definitive collection that provides a truly integrated perspective of this giant field.