Potential Infill Reserve Additions by Interval: San Juan Basin. Topical Report August 1989

摘要

The study has assessed the infill drilling program in the San Juan basin to estimate the incremental gas resource from future infill drilling in the producing sections of the basin as of December 31, 1985. The work indicates that the survey of the historical drilling patterns can provide a basis to assess the incremental infill potential. The analysis supports the 160-acre spacing rule in the San Juan basin on a macro basis, and it also indicates that at least two of the formations, the Pictured Cliffs and the Chacra, can be drilled more densely than 160 acres. The ultimate spacing in several other intervals may also be closer than 160 acres. The data to date, however, can provide a basis to take the infill potential past 160 acres in only the Pictured Cliffs formation, and then only to the potential associated with a fifth completion in the formation. The analysis indicates that a substantial infill potential remains in the basin. The potential is 6,860 billion cubic feet, about 25 percent of the reserve additions in the basin through 1985. A substantial part of the infill resource would be economically attractive at even today's gas prices.