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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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Core Measurements on Vuggy Carbonates Can be Misleading
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The log (density/neutron cross-plot) porosity, in the core/log porosity cross-plot above, is systematically much higher than the routine core analysis helium porosity, measured on cores from the same depths. It is not unusual for routine core analysis (KPS) porosities to differ from from log estimates. KPS porosities, however, are usually larger than the log values because the routine core measurements are made at ambient (i.e., unconfined) pressures. The cross-plot above shows the exact opposite relationship. |
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The reason for the above Log/Core porosity cross-plots relationships are obvious from the acoustic borehole televiewer (BHTV) false color synthetic core images. The reservoir rock is riddled with small (pea sized to thumb nail sized) vugs, which manifest themselves as small protuberances on the outside of the BHTV synthetic core images. Routine KPS measurements, using two different protocols, did not see these small vugs and yielded the matrix porosity only, while the wireline porosity is the total (including vuggy) porosity. |
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How May I Help You Solve Your Complex Reservoir Geology Fomation Evaluation Problems? |
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Send Me an E-Mail |
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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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