5- Given the following well log and based on the information that is provided to

Question

5- Given the following well log and based on the information that is provided to you in the log header, what is the formation water resistivity at the reservoir temperature? What is shale volume at reservoir depth? Why you did not use the SP relationship with R. instantly to calculate water resistivity (20 pts) Show your work on the graphs and calculation steps to get partial credit. HIGH RES INDUCTION HALLIBURTON SPECTRAL DENSITY DUAL SPACED NEUTRON COMPANY GO FOR IT WELL FIELD TRAVIS COUNTY TRAVI STATE TEXAS Me as Tempe 200 7500 MEAS MAS NA NA NA NA BHT

Explanation / Answer

Witrh reference to log data the reservoir rand characteristics is shown in MD of 7440m to 7450m.

Rm is about 0.86 at 143Fo.

thus taking information from figure 2,

Rmf = 0.8 ohm.m

Rw = 2.5 ohm.m

Shale volume at reservoir depth = (SPlog - SPshale) / (SSP - SPshale)

= (8-28)/(8-28) = 1 i.e. 100%

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