Evaluation of Porous Medium Permeability by Acoustic Logging Finds Geothermal Applications
In a well, after an acoustic waveform has circulated through the surrounding porous media, the study of its alteration can help in evaluating their permeability. The treatment of the acoustic compressional wave's first three cycles yields a unique parameter called I-c. The recording of this I-c log all along any open hole interval is now possible by respecting some practical rules known by logging companies. Large flows of fluid found in geothermal low-enthalpy operations have provided an opportunity to check the validity of this method. Cumulative I-c derived permeability with depth (''EXAFLO'' log) correlates with the flowmeter log, as examples will show. Some new aspects of the theory underlying the I-c/permeability relationship have been developed and are described here.
- Research Organization:
- IPG-Institut de Physique du Globe de Strasbourg; IFP - Institut Francais du Petrole, Ruell-Malmaison; BRGM - Bureau of Recherches Geologiques et Minieres, Orleans
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AS03-80SF11459; AS07-84ID12529
- OSTI ID:
- 887169
- Report Number(s):
- SGP-TR-93-42; TRN: US200618%%169
- Resource Relation:
- Conference: Proceedings, Eleventh Workshop Geothermal Reservoir Engineering, Stanford University, Stanford, California, January 21-23, 1986
- Country of Publication:
- United States
- Language:
- English
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