WebAug 20, 2024 · The work proposal is testing, in carbonates, an empirical methodology to estimate porosity from measured S-wave slowness (already been successfully tested in sandstones, Silva and Beneduzi... WebPermeability estimation from sonic-transit-time versus porosity gradients. Javalagi, Mohan Ishwar. University of Wyoming ProQuest Dissertations Publishing, 1995. 9630608.
Sonic/ Acoustic Wave Logs - Petrocenter
Web1. n. [Formation Evaluation] An indicator of the porosity that does not contribute to a sonic measurement of interval transit time.The transit time is little affected by vugs, fractures and other irregular events because the sonic wave finds a faster path around them. Spherical pores such as oomolds also have less effect on traveltime than oblate pores. . Thus, when … 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: ∅= flw ccc
Log analysis in shaly formations - PetroWiki
WebJun 24, 2015 · The neutron-porosity log first appeared in 1940. It consisted of an isotopic source, most often plutonium-beryllium, and a single detector. Many variations were produced exploiting both thermal and epithermal neutrons. In most of the early tools, neutrons were not detected directly. 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 ... WebJun 24, 2015 · The three principal porosity logs (density, neutron, and sonic) are scaled and placed so that they overlay and track one another in a particular clean matrix. Violated assumptions as to matrix and fluids stand out when the logs do not overlay. A particular matrix must, of course, be chosen. Most often, all logs are displayed on a limestone matrix. flw building 312