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California Registered Geophysicist No. 170 California Registered Geologist No. 6043 Kentucky Registered Professional Geologist No. 1624 Texas Licensed Professional Geophysicist No. 6289 |
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Proper selection of wireline measurements and display easily highlights a fractured vesicular basalt reservoir. |
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The above composite log suite is from a geothermal well drilled into a fractured vesicular basalt reservoir. The log suite consists of a dual (crossed X-Y) caliper, dual induction, micro-spherically focused log (DIMSFL), spontaneous potential (SP), gamma ray (GR), borehole compensated (BHC) sonic, formation density compensated (FDC), and compensated neutron log (CNL). |
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Track 1 contains the X & Y calipers, track 2 contains the GR and SP, track 3 contains the DIMSFL resistivities, track 4 contains the BHC inverted to velocity, and track 5 contains the FDC & CNL. The reservoir starts at about 760 ft. At that depth, the resistivities, GR, and BHC velocity all drop and the FDC/CNL overplot switches to a clay type cross-over. The interpretation is that the fractured vesicular basalt reservoir rock has been leached by the geothermal fluids, resulting in argillic alteration of the basalt. There is also an approximately -60 mv SP anomaly. This was due to the fact that the well was logged while pumping 1,600 BPD water down the "kill line" to cool the well so that conventional, or non-hostile environment logs (HEL), could be run. This very high water input, resulted in a large streaming potential build up across the filter cake opposite the reservoir. |
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If your Internet browser is not configured to send e-mail, send your e-mail directly to my e-mail address: dgh@hillpetro.com |
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Contact: Donald G. Hill at: Cell/Business Phone: +(925) 437-5748, FAX: +(309) 420-7354, Home Phone: +(925) 947-1541 E-Mail: dgh@hillpetro.com |
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