WebJan 18, 2024 · Each of the porosity tools—density, compensated neutron, sonic, and photoelectrical effect—can be used to estimate porosity when lithology and fluid properties are known. ... A typical presentation of a compensated neutron measurement is shown in the log in Figure 2. Sonic. Sonic devices measure the velocity of various acoustic waves, … Webthe sonic log to a porosity log generates an apparent porosity trace keyed to one or other matrix mineral, in a similar fashion to the neutron and density logs. Primary and …
Well log analysis for reservoir characterization - AAPG Wiki
WebThe neutron will deflect to the right showing lower porosity. This happens since in gas, the neutron porosity, which reads the H+ concentration is lower than in liquid, giving lower porosity. In the log below, we can clearly see the neutron and density log curve crossover each other. This indicates the butterfly effect where the gas bearing ... WebPorosity: The percentage of a given volume of rock that is pore space and can therefore contain fluids; symbolized as . This is typically calculated using data from an instrument that measures the reaction of the rock to … fnf character test playground mod
Sonic/ Acoustic Wave Logs - Petrocenter
WebDensity Log. The density log usually labelled ‘RHOB’ measures the density of the borehole and the rocks penetrated by the drill bit. The unit for density is gram per cubic centimetre. The logs (sonic and density) measurements are usually made every 6 in. down hole, but must be aligned to be ‘on-depth’ with each other. WebCalculating Porosity. Many relationships between travel time and porosity have been proposed, the most commonly accepted is the Wyllie time-average equation. The equation … WebHowever when sonic porosities of carbonate with vugs or fractures are calculated by W yllie’s formula, porosity values come very low. This happens because sonic logs only record matrix... green trails cleaning