Comparison of Empirical Models for Calculating the Vuggy Porosity and Cementation Exponent of Carbonates from Log Responses |
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Page 1
... pore type . This study evaluates the various models for estimating vuggy porosity and the Archie cementation exponent from wireline logs , illustrates the difficulty of log interpretation applied to complex pore types , and presents ...
... pore type . This study evaluates the various models for estimating vuggy porosity and the Archie cementation exponent from wireline logs , illustrates the difficulty of log interpretation applied to complex pore types , and presents ...
Page 5
... porosity is much less than the matrix porosity ( van Golf - Racht , 1982 ) . Borehole tele- viewers and formation microscanners ( FMS ) are more powerful tools for detecting fractures . Measuring and Calculating Vuggy Porosity Vuggy ...
... porosity is much less than the matrix porosity ( van Golf - Racht , 1982 ) . Borehole tele- viewers and formation microscanners ( FMS ) are more powerful tools for detecting fractures . Measuring and Calculating Vuggy Porosity Vuggy ...
Page 8
... porosity ( % ) Wyllie time - average equation Atf = 150 ( μs / ft ) Atf = 189 ( μs / ft ) 40- 0 10 20 Core porosity ( % ) 8 . 30 30 QAa1216c FIGURE 8 ... Calculating Vuggy Porosity from Logs Secondary Porosity Index (SPI) model Nurmi model.
... porosity ( % ) Wyllie time - average equation Atf = 150 ( μs / ft ) Atf = 189 ( μs / ft ) 40- 0 10 20 Core porosity ( % ) 8 . 30 30 QAa1216c FIGURE 8 ... Calculating Vuggy Porosity from Logs Secondary Porosity Index (SPI) model Nurmi model.
Common terms and phrases
acoustic logs acoustic signals bypass acoustic transit anhydrite Archie cementation exponents Archie equation Brie calculated by equation calculating cementation exponents calculating separate-vug porosity Calculating Vuggy Porosity carbonate rocks Cementation exponents calculated connected to interparticle core data CT scan density logs derived from point-count dolomite effect of vuggy Formation evaluation formation factor fusulinid Gaines County intergranular interparticle pores intragranular microporosity isolated vugs Lucia and Conti models for calculating modified Myers model multiple pore types Nurmi model Oldham County percent permeability point-count data pore space porosity and cementation power-law models quadratic and power-law resistivity logs sample Schematic diagram secondary porosity separate vugs separate-vug and touching-vug separate-vug porosities calculated separate-vug porosities derived shown in figure Sonic transit SPI model SWEC Mansfield tation exponent thin sections total porosity touching vugs touching-vug carbonates versus core porosity vug porosity vuggy porosity calculated well-connected planar fractures wireline logs Wyllie time-average equation Wyllie time-average formula Φι Фір