Self-consistent log interpretation method
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United States of America Patent
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Apr 10, 1990
Grant Date -
N/A
app pub date -
Dec 8, 1986
filing date -
Dec 8, 1986
priority date (Note) -
Expired
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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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