Self-consistent log interpretation method

Details Self-consistent log interpretation method Self-consistent log interpretation method

1986-12-08

1990-04-10

Lastova, John R.

Boots, shoes, and leggings

364153, 324351, 73152, G06F 1520

Patent

active

049166166

ABSTRACT:
Responses of subsurface formations adjacent a well borehole are obtained from a number of types of well logs. The well logs typically include a resistivity log, a gamma ray log, a density log, a neutron log and an induction or electromagnetic wave log. Parameters of interest are determined in evaluating whether the subsurface formations are of interest for petroleum contents by a non-linear programming technique based on the log responses obtained. The parameters of interest are maintained self-consistent, i.e. their contribution to log measurements is based on the same value for the parameter in its effect on each log in which they produce a response.

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R. Fletcher, "Fortran Subroutines for Minimization by Quasi-Newton Methods", U.K. Atomic Energy Authority Research Group, (1972), pp. 1-29.

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