Distinguishing true basement from dikes and sills encountered in

Details Distinguishing true basement from dikes and sills encountered in Distinguishing true basement from dikes and sills encountered in

1982-05-13

1983-12-13

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4900

Patent

active

044198876

ABSTRACT:
In drilling a borehole, true basement is distinguished from a dike or sill by logging the borehole with a gravimetric logging tool and with a formation density compensated logging tool. The difference between the density and the gravity, as determined by these logs is plotted as a function of depth over the interval extending above the point at which the drilling encountered the dense rock formation. The difference log so obtained distinguishes whether rock formation is true basement or a dense intrusion.

REFERENCES:
patent: 3590228 (1971-06-01), Burke
patent: 4293933 (1981-10-01), Park et al.

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