skip to main content

Title: Pressure-interference testing of the Sumikawa geothermal field

Pressure interference tests have been used to determine the permeability structure of the Sumikawa reservoir. Interference tests between wells S-4 and KY-1 have indicated the presence of a very high permeability (140 md) north-south channel in the altered andesite layer. Pressure buildup data from well SN-7D have provided indications of a high transmissivity (kh {approx} 18 darcy-meters) reservoir located in the granodiorite layer, lack of pressure response in nearby shutin Sumikawa wells implies that the reservoir penetrated by SN-7D is isolated from the shallower reservoir in the altered andesites. The ''altered andesite'' and the ''granodiorite'' formations constitute the principal geothermal aquifers at Sumikawa. Pressure interference tests (wells KY-1 and SB-2, and wells KY-2 and SB-3) have also confirmed the presence of moderately high transmissivity ({approx} 2 darcy-meters) dacitic layers in the ''marine-volcanic complex'' formation. Because of its low vertical permeability, the ''marine volcanic complex'' formation constitutes an attractive target for the reinjection of waste geothermal fluids.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
888485
Report Number(s):
SGP-TR-134-28
TRN: US200619%%242
Resource Type:
Conference
Resource Relation:
Conference: Proceedings, sixteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 23-25, 1991
Research Org:
NoneNew Energy and Industrial Technology Development Organization (NEDO), Tokyo, JP
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 15 GEOTHERMAL ENERGY; ANDESITES; AQUIFERS; BUILDUP; GEOTHERMAL FIELDS; GEOTHERMAL FLUIDS; GRANODIORITES; PERMEABILITY; REINJECTION; RESERVOIR ENGINEERING; TARGETS; TESTING; WASTES; Geothermal Legacy