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STUDENT ...--GPHY3423 PETROLEUM GEOLOGY AND GEOPHYSICS EXAMPLE 1- MICROLOG Fill in blanks and circle the correct answers The Microlog is scaled 0 to 20 ohms or _ ohm per log division. The caliper at 773 moves to the (left, right) indicating mud cake. The (solid, dashed) curve is identified as the Microlog Lateral. which reads less than the Microlog Normal (solid, dashed) in (permeable, non- permeable) zones. The Gamma Ray (GR) is scaled 15 API units per division and reads slightly under at 773 suggesting the zone contains a (small, large) quantity of clay. The caliper at 780 moves {left, right), which suggests no perm. The two curves go off scale to the right suggesting (low, high) resistivity, which is indicating (low, high) formation fluid in the rock. The GR reading at 780 is slightly above (15, 30) API units.The GR at 785 reads midway between and suggesting (low, high) clay content with micro normal reading (8, 9, 10) and micro inverse reading approximately (9.5, 10.5, 11.5), which is indicative of (permeable, non-permeable) strata. The GR at 816 moves to the (left, right), which should indicate (lower, higher) clay content. The micro normal curve reads (10, 11, 12) with the micro inverse reading (9.5, 10.5, 11.5) which indicates the zone is {permeable, non-permeable. The GR at 828 reads (75, 85, 95) API units, which should indicate (less, greater) clay content. The micro normal reads about (8, 9, 10) and the micro inverse reads (6, 7, 8), which suggests (permeable, non-permeable) strata. Remember, in genera" the zones of higher perm will read closer to the depth track and have lessspread between the curves and always check the caliper. --~--- ---.-- . -- ~:~ ~~~~-------4--+--~~-- -- .. - --10. ...--. .:* ± __ $ i ~=_~,"",_d~'-+-I ~--I-- I r -,;;;I .. - . ...:. 1800 .-- ...... , ..• :~ - .. ~. ~ ;.. . .... .. - -- -- I.- 150 1: 240 ft 16 0 Gamma API alll CaJiDer '5K Tension ,.2- j..... -----------~.- pound. 20
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EXAMPLE 2 - DENSITY lOG The density log example contains GR0-150 APt units, caliper 6" to 16", Pe 0-10, bulk density 2.0 to 3.0 grams/co, correction in grams per cc -.25 to +.25 and line tension 15,000 to O. The conversion of bulk density to porosity is done by the formula log bulk density = porosity x fluid density + (1 - porosity) x matrix density. The matrix most often used for calculating porosity are: limestone __ gr./ce, sandstone gr./cc and dolomite gr./cc. The Pe associated with these minerals has values: limestone ~ sandstone __ and dolomite
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This note was uploaded on 02/04/2012 for the course GPHY 3423 taught by Professor Marfurt during the Fall '11 term at The University of Oklahoma.

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