HEAVY OIL IN Shaly Sand (Ancient Logs)
One way to test the techniques for ancient logs is to run the math on a modern log suite and compare results to the same logs after eliminating all the curves that would not have been available in ancient times. In this well, we have conventional induction-electrical and density-neutron logs in a heavy oil well. By assuming that the induction resistivity is similar to a 64 inch normal and that the only shale indicator is the SP, we can compare this "ancient" log suite with the modern version in the identical rock/fluid sequence using standard computer-aided log analysis.

 


IES and CNL FDC for heavy oil case history 1978


Conventional log analysis using GR, CNL, and FDC. Pick water contact in GP sandstone. Is there a contact in the Sparky sandstone? Compare your answer to resistivity log.


Same well computed with IES, SP, and PHIMAX = 0.34. Compare to results in previous illustration.

Although the induction resistivity is focused better than a 64 inch normal, this example shows that the PHIMAX method is quite suitable in a shaly sand sequence.
 

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