Density vs neutron porosity logs
WebThe formation density log is useful for determining the porosity of a logged interval. The porosity is given by (7.4.1) where ϕ = porosity ρ ma = density of dry rock ρ b = bulk density recorded by the log ρ f = fluid density Density logs rely on Compton scattering to determine bulk density. WebMay 6, 2024 · Density log measures electron density, which will be transformed into bulk density, we calculate porosity by assuming the matrix density and fluid density. …
Density vs neutron porosity logs
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WebJul 15, 1991 · This log compares core porosity, core transform porosity, and pseudocore transform porosity (with maximum and mean log10 neutron deflection vs. 0.015 and mean porosity of the core data to generate ... The density–neutron log is a combination log that simultaneously records neutron and density porosity. In some zones, porosities recorded on the logs differ for three reasons: 1. The matrix density used by the logging program to calculate porosity is different from the actual formation matrix density. 2. … See more The density log measures the electron density of a formation. The logging device is a contact tool that emits gamma rays from a source. Emitted gamma rays collide with formation … See more Lithology, porosity, fluid type, and tool type affect neutron log response. When interpreting neutron logs, use the specific log for the specific … See more Formation bulk density is a function of matrix density, porosity, and fluids contained in the pore space. Formation bulk density … See more The neutron logmainly measures hydrogen concentration in a formation. The logging device is a noncontact tool that emits neutrons from a source. Emitted neutrons collide with nuclei of the formation and lose … See more
WebGypsum (CaSO4· 2H2O) has a very low gamma-ray response, a neutron porosity (limestone-equivalent) of about 60%, a log bulk density of 2.35 gm/cc (21% limestone-equivalent porosity), and a photoelectric factor of … WebThe velocity log provided by the instrument helps to define beds and evaluate formation porosity. Density can now be logged with a new technique that uses radioactivity ( density logging ). The instrument consists of a radioactive cobalt source of γ-rays and a Geiger counter as a detector, which is shielded from the source.
WebIn order to eliminate the effect of porosity, we must first estimate its volume, either by using a neutron-density crossplot or by averaging the density and neutron porosity logs: phi= (PHID+PHIN)/2 Now, because the relationship between density and porosity is given by the mass-balance relationship: RHOb = phi*RHOf+ (1-phi)*RHOma WebJun 24, 2015 · In this case, the density log is scaled from 1.65 to 2.65 g/cm 3, and the neutron log is scaled from 60 to 0% porosity, in sandstone units. As above, 1.65 g/cm …
WebCombination with other porosity estimations through neutron-density and sonic logs were included in a cross plot to determine the type of porosity on each well, as proposed by …
WebThe suite of logs should include gamma ray, dipole sonic, deep resistivity, neutron porosity, and density measurement. In addition to log data, at least one well in the … michigan essential workers billWebThe near-to-array porosity and gamma ray logs indicate a gradual upward decrease in clay across two shale inter- vals, from 730 to 685 ft and 668 to 655 ft. The near-to-far porosity 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. michigan essential oilsWebJun 24, 2015 · Density-porosity log interpretation In the standard sequential interpretation process, the analyst determines porosity directly from the density log. It is conceptually the easiest of the porosity logs to interpret because, if ever a tool obeyed a linear bulk mixing law, it is the density logs. michigan essential workers bonusWebdensity of a substance by Eq. (13.1). The bulk density of a rock depends upon the solid minerals of which it is composed, its porosity, and the density of the fluids filling that porosity. Hence, the formation density tool is useful in the determination of porosity, the detection of low density fluids michigan essential workers stimulusWebFor clean, shale-free formations, in which the porosity is filled with water or oil, the neutron log measures the fluid-filled porosity. Because gas has a much lower hydrogen density than oil or water, gas-filled porosity appears as low porosity. the north face winter coats ebayWebCombination with other porosity estimations through neutron-density and sonic logs were included in a cross plot to determine the type of porosity on each well, as proposed by Hakimi, et al. (2012 ... michigan essential workers covid vaccineWebMay 23, 2024 · In density logs, which measure electron density and transform it into bulk density, porosity is calculated by assuming the matrix density and fluid density. Neutron log measures the ratio of … the north face winnipeg