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COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA
Abstract Electrical and acoustic image logs collect
Electrical and acoustic image logs collected from well 58A-10 in crystalline rock on the eastern margin of the Coso Geothermal Field, CA, reveal different populations of planar structures intersecting the borehole. Electrical image logs appear to be sensitive to variations in mineralogy, porosity, and fluid content that highlight both natural fractures and rock fabrics. These fabric elements account for about 50% of the total population of planar structures seen in the electrical image log, but locally approach 100%. This fabric is unlikely to contribute to permeability in the reservoir. Acoustic image logs reveal a similar natural fracture population, but generally image slightly fewer fractures, and do not reveal rock fabric. Both logs also record textural properties of deformed materials within fractures; these textures can be related to variations in mineralogy, alteration, or porosity using the electrical log and can be used to infer slip history. In addition, locations of high fracture density occur adjacent to major faults, but also occur as zones confined within intervals of distinct rock type. The acoustic image logs collected in Well 58A10 reveal large numbers of drilling-induced borehole wall tensile fractures and breakouts. In addition, previously un-recognized drilling-induced petalcenterline fractures are evident in images of the borehole wall from this well. These features are thought to form just ahead of the drill bit and provide additional constraint on the orientation of the minimum horizontal stress. Both breakouts and petalcenterline fractures are difficult to identify in electrical image logs because of the low percentage of the borehole wall imaged. Analysis of induced structures in acoustic image logs indicates that the minimum horizontal stress is oriented along an azimuth of 102º±18º. This orientation is consistent with the local strike of the Coso Wash normal fault that bounds the basin containing well 58A-10.
t bounds the basin containing well 58A-10.  +
Author Davatzes  + , N.C.; Hickman  + , S.H.  +
Citation Davatzes, N.C.; Hickman, S.H.. 1/1/2005
Davatzes, N.C.; Hickman, S.H.. 1/1/2005. [[COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA]]. Proceedings of <span title="Missing required info" style="font-weight:bold;color:red;">(!)[[Category:Missing Required Information]]</span> ; <span title="Missing required info" style="font-weight:bold;color:red;">(!)[[Category:Missing Required Information]]</span> : PROCEEDINGS, Thirtieth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 31-February 2, 2005.
, California, January 31-February 2, 2005.  +
Document type Conference Proceedings  +
Name COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA  +
PublicationDate January 1, 2005  +
Publisher PROCEEDINGS, Thirtieth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 31-February 2, 2005  +
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COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA + , COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA + , COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA + , COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA + , COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO GEOTHERMAL FIELD, CA +
Categories References , Missing Required Information , Reference Materials
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03:07:52, 19 September 2014  +
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Acoustic Logs At Coso Geothermal Area (2005) + Reference material
 
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