Comparison of Empirical Models for Calculating the Vuggy Porosity and Cementation Exponent of Carbonates from Log Responses |
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Page 10
... shown in figure 9a , the cementation exponent increases with the ratio of separate- vug to total porosity , which is referred to as the vuggy porosity ratio ( VPR ) because separate - vug porosity contributes little to electrical ...
... shown in figure 9a , the cementation exponent increases with the ratio of separate- vug to total porosity , which is referred to as the vuggy porosity ratio ( VPR ) because separate - vug porosity contributes little to electrical ...
Page 18
... shown in this example , it could indicate a fundamental problem in the Wyllie time - average formula . In addition , as shown in figure 7a , only four data fit with the Wyllie time - average formula when the formula was adopted for ...
... shown in this example , it could indicate a fundamental problem in the Wyllie time - average formula . In addition , as shown in figure 7a , only four data fit with the Wyllie time - average formula when the formula was adopted for ...
Page 21
... shown in table 1 , the touching - vug carbonates , which Myers originally ... Figure 15c shows that the modified Myers model underestimates the ... figure 17 , the mip of 1.91 is used in calculations with the dual- porosity model . As ...
... shown in table 1 , the touching - vug carbonates , which Myers originally ... Figure 15c shows that the modified Myers model underestimates the ... figure 17 , the mip of 1.91 is used in calculations with the dual- porosity model . As ...
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