Title:

Evaluation of the Makushin Geothermal Reservoir, Unalaska Island

Authors:

M.J. Economides, C.W. Morris, D.A. Camp

Geo Location:

Makushin Volcano, Alaska; Unalaska Island, Alaska

Conference:

Stanford Geothermal Workshop

Year:

1985

Session:

Reservoir Evaluation

Language:

English

File Size:

220KB

View File:

Abstract:

Analysis of an extended flow test of well ST-1 on the flanks of Makushln Volcano lndlcates an extenslve. water-domlnated, naturally fractured reservolr. The reservolr appears to be capable of dellverlng extremely large flows when tapped by fullslze productton wells. A productlvlty Index ln excess of 30.000 lb/hr/psl lmplles a phenomenal permeablllty-thlckness product, In the range of 500.000 to 1,000.000 md-ft. The flowlng bottomhole (1,949-foot) temperature of the fluld I s 379?F. whlch 1s lower than the measured statlc temperature at that depth (395'F). Thls phenomenon, coupled wlth an observed statlc temperature gradlent reversal from the maxlmum 399'F observed at 1,500 feet, lndlcates that the reservolr proper I s located some dlstance from the well. Presumably It I s at a temperature sllghtly lower than 379?F and comnunlcates wlth the wellbore Vla a hlgh conductlvlty fracture system. A materlal balance calculatlon ylelds an estlmate of reserves that are capable of sustalning all of the present power needs of the Island (13+ IIW peak) wlth a geothermal power plant for several hundred years. Theoretlcally, a slngle large dlameter well at the slte of ST-1 could sattsfy thls requlrement.


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