دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

an empirical relationship between the formation resistivity, F, and porosity, , in which F=1/m, where the porosity exponent or cementing factor, m, is a constant for a particular formation. Typical m’s are 1.8 to 2.0 for consolidated sandstones and 1.3

cased hole formation resistivity tool.

n: an electric log in which current flow in the logging tool was dispersed through the mud in the wellbore prior to entering the formation. As a result, formation resistivity measurements were often inaccurate. These logs are no longer used.

n: a log designed to provide the resistivity measurements necessary to estimate the effects of mud filtrate invasion into the formation surrounding the wellbore so that more reliable values for the the formation resistivity may be obtained. The resistivity curves on this log are made by deep-, medium-, and shallow-investigation induction. Visual Observation of the dual induction focused log can give valuable information regarding invasion, porosity, and hydrocarbon content. The three curves on the log can be used to correct for deep invasion and obtain a better value for formation resistivity. Compare induction survey.

n: Schlumberger wireline tool that records a Spontaneous Potential log and three resistivity curves at different depths. Used to deduce true formation resistivity Rt, invasion profiles and quicklook Hydrocarbon detection.

n: Schlumberger wireline tool that measures deep and shallow formation resistivity. Used to deduce true resistivity Rt, flushed zone resistivity, invasion profiles, quicklook Hydrocarbon detection and indication of moved Hydrocarbons.

formation resistivity factor, dimensionless.

n: a measure of the electrical resistance of fluids in a formation. formation sensitivity n: the tendency of certain producing formations to react adversely to invading filtrates.

a measurement of the electrical resistivity of a formation. The measurement will be significantly affected by the type of fluid and the salinity of water based fluids within the pores of the rock.

a formation resistivity tool that involves the use of a guard tool.

n: a focused system designed to measure the true formation resistivity in well bores filled with salty mud. Current is forced by guard electrodes to flow into the formation. Also called Laterolog N.