Porosity from sonic log
WebJul 28, 2016 · The sonic log may be used to determine porosity by charting the speed of a compressional sound wave as it travels through the formation. Interval transit time (∆t), measured in microseconds per meter [foot] and often referred to as slowness, is the reciprocal of velocity. Lithology and porosity affect ∆t. WebPorosity from the Sonic Log The sonic log is widely used to estimate porosity. The method works well when shale volume and matrix rock sonic travel time are accurately known. …
Porosity from sonic log
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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 … WebThe sonic log will underestimate porosity in uncompacted formations. In general, the sonic log is unsuitable for these formations and should not be used to determine porosities. However, if only the sonic log has been run, then it is possible to correct for this underestimation, an empirical correction factor, C p, is used, as follows: ∅=
WebMay 6, 2024 · The porosity is an indicator of how much empty space inside your rock that could be filled with water and/or hydrocarbon. However, the tricky part is "porosity" from porosity log is never a... Webporosity log reads 4 to 8 p.u. higher than the near-to-array reading in the shales, which is to be expected because of the clay’s increased atom density. Across the same intervals, the CNL thermal neutron porosity log reads higher than the near-to-array porosity (an epithermal measurement) because of thermal absorbers in
Web10 rows · The Sonic Log measures the acoustic transit time, Δt, of a compressional sound wave traveling ...
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 …
WebThe sonic log may be used to determine porosity by charting the speed of a compressional sound wave as it travels through the formation. Interval transit time (t), measured in … billy thai amsterdamWebTHIS PAGE Pore Volume Porosity From Sonic Log Porosity From Density Log. The second calculation step in a log analysis is to find shale corrected porosity. Pore volume is the space in a rock filled with oil, gas, or water. Total porosity includes the bound water in the shale and is called PHIt. cynthia flahive folsom attyWebCalculating Porosity. Many relationships between travel time and porosity have been proposed, the most commonly accepted is the Wyllie time-average equation. The equation … cynthia flanagan obituaryWebJan 18, 2024 · Porosity from sonic Application The compressional sonic log can be used as a moderately good estimator of porosity in water and, to some degree, oil-filled rocks. … billy thanwijayaWebThis means that a sonic log can be used to calculate the porosity, confining stress, or pore pressure of a formation if the seismic velocity of the rock matrix, , and pore fluid, , are … cynthia flanagan macon obituaryWebJun 24, 2015 · The layer of closely bound surface water on the clay particle can represent a very significant amount of porosity. However, this porosity is not available as a potential reservoir for hydrocarbons. Thus, a shale or shaly formation may exhibit a high total porosity, yet a low effective porosity as a potential hydrocarbon reservoir. cynthia flanaganWebJan 1, 2024 · Where e: Effective porosity from Neutron-Density lo gs; N: Porosity by Neutron log; D: Porosity by Density Log. The porosity can be calculated by neutron-sonic equa tion [42]: billy thanner