Porosity calculation from logs
WebJun 8, 2012 · The porosity may be overestimated or underestimated when calculated from conventional logs and also underestimated when derived from nuclear magnetic …
Porosity calculation from logs
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WebJun 8, 2012 · The porosity may be overestimated or underestimated when calculated from conventional logs and also underestimated when derived from nuclear magnetic resonance (NMR) logs due to the effect of the lower hydrogen … Web(φ). Log analysts evaluate porosity either from core measurements or analysis of porosity tools (density; ρb, neutron; φN, and acoustic; Δt). In the absence of core measurements, much useful information about porosity can be known by using a combination of at least two of these logs. The lack of these porosity tools makes the determination of
WebJun 14, 2024 · Porosity Vs. Density. While porosity is the percentage of empty space inside a material, density is a measure of mass per a given volume. The denser a material, the less likely there will be voids ... WebWhen using a single porosity log, the true porosity is calculated from interpolation between the values for the matrix mineral and the pore fluid (usually equated with mud filtrate, …
WebPorosity is defined as the ratio of volume of pores to the to total volume of the rock. It occurs as primary (depositional) or secondary (diagenetic or solution) porosity. Primary … WebSecondary porosity (FPR2), the apparent pore structure index (m*), deep and shallow laterolog amplitude difference (FLPL), uranium anomaly index (FPU), fracture probability function (FIDX), and fracture development index (FID2) are calculated based on conventional logs using the preceding methods.
Webcontribution and removing it from the total porosity measurement, log analysts are able to compute the effective porosity, which more accurately portrays a reservoir’s potential. The gas effect results from two physical measurement principles. Gas-filled porosity is seen by the neutron porosity tool as low porosity. In contrast,
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. Neutron log measures the ratio of count ... income beneficiary vs capital beneficiaryWebJun 24, 2015 · Total-porosity-logging mode provides data to determine porosity, permeability, and productivity (mobile fluids). Total-porosity acquisition is a multiple-wait … income below filing threshold irsWeb1 day ago · 1.Introduction. Tight oil is the oil that exists in the tight sandstone reservoir, carbonate reservoir, and other reservoirs with air permeability less than 1 mD and can be used for commercial exploitation through certain technical measures (National Energy Administration, 2024).Since the successful exploration and development of tight oil in … income between two citiesWebAug 20, 2024 · The method used to estimate porosity proposes a different way to calculate deviation log (Eberli et al., 2003), currently used to identify porosity type in carbonates. It was redefined in... income below tax free thresholdWebJan 1, 2004 · Abstract. The next class of well logs to be considered is generally referred to as porosity logs. Although each produces a porosity value from basic measurements, none actually measures porosity directly. Two such logs, the density and neutron, are nuclear measurements. A third log, the sonic, uses acoustic measurements, and the fourth and ... income bonds for saleWebJun 19, 1994 · Neutron porosity is unaffected by the common non-clay minerals such as quartz, feldspar, carbonates and pyrite, which are present in shales. Therefore, the estimation of volume percent clay can be corrected by multiplying the conventional clay-estimation equation by the factor C as discussed above. income bonds martin lewisWebThe 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 … income bonds monthly interest