Donald G. Hill, Ph.D., 

R.Gp., R.G., R.P.G.

Consulting Petrophysicist

"The World is my District"


California Registered Geophysicist No. 170

California Registered Geologist No. 6043

Kentucky Registered Professional Geologist No. 1624

Texas Licensed Professional Geophysicist No. 6289


Use Structural Cross-Sections to Explain Unexpected Drilling Results



The object in drilling well F-15 was to follow along the underside of the structure bounding fault (Fault-E), staying within the footwall.  Shortly after entering the A-2 sand, the well floated and crossed Fault-E, into the hanging wall, repeating the E7 through A2 sands.  The operator correctly picked the fault intercept, but interpreted the fault to be antithetic to the bounding fault (i.e., similar to Fault M) and correlated the sands below the fault to the deeper A-4 through A-7 sands.  This structural interpretation caused complications with other wells along strike, which had pay in the sands below A-2.  Careful correlation of the F-15 well logs to themselves and to those of other wells along strike revealed the correct interpretation (above).

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Contact:  Donald G. Hill at: Cell/Business Phone:  +(925) 437-5748,   FAX:   +(309) 420-7354,   Home Phone:  +(925) 947-1541  


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