Porosity calculation from logs
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 …
Porosity calculation from logs
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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 … WebTo evaluate porosity (Ø) from ρ b or ∆tmeasure- ments, the log analyst must factor in the respective densities or interval transit times of the rock matrix and the drilling fluid. The …
WebJan 4, 2024 · Passey et al. mentioned that the application of vertical well log interpretation methodology to horizontal wells can result in porosity calculation errors up to 6%, water saturation uncertainty up to 50%, and true stratigraphic thickness errors of up to 300%. Therefore, interpretation in horizontal wells requires additional knowledge about the ... WebWith reference to the conceptual model for calculating the porosity of volcanic reservoirs, the theoretical models for interpreting porosity are built on the basis of nuclear magnetic logs and acoustic logs, whereas the statistical models are constructed on the basis of core experiments, acoustic logs, density logs, and neutron logs for various ...
WebWhere, ∆logR = scaled difference between deep resistivity and density logs and LOM = level of organic maturity. Where, RT = deep resistivity log in ohm/m, RTbaseline = resistivity in the organic-lean zone in ohm/m, PHI = porosity log (i.e. sonic, density or neutron logs), PHIbaseline = porosity log reading in the organic-lean zone. WebJan 4, 2024 · Archie’s equation can be used to calculate the oil saturation of a formation from resistivity logs. Archie's Equation & Other Calculations. Archie’s equation can be used to calculate the porosity, water saturation, and oil saturation of sandstones and limestones from resistivity logs. Archie’s equation cannot be applied to shales.
WebOct 11, 2024 · Total porosity was also calculated using neutron-density porosity logs. The effective porosity was obtained from the total one after extracting the shale percentages from the formation....
WebNov 25, 2024 · The aim of the study was to show that the petrophysical parameters, characterizing the shale gas formation, obtained from the various scale well logging and laboratory methods, correlated among themselves. Relationships determined on the basis of mesoscale (logs) and microscale outcomes (laboratory experiments on plugs or crumbs) … how to see storage sharepointWebJun 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. how to see stored passwords windows 11WebApr 7, 2024 · Some of those porosity logs are used to calculate the volume fraction of kerogen. The third track is the resistivity track, which contains the shallow lateral resistivity log (LLS) and deep lateral resistivity log (LLD). The LLD is used as when calculating TOC with the dual- method. The fourth track shows the calculation of from and . how to see storage usage windowsWebJan 18, 2024 · The best logs for lithological purposes are those that are (1) most influenced by rock properties and (2) least influenced by fluid properties. The most useful of the commonly available logs are Gamma ray Spontaneous potential (SP) Caliper Formation density Photoelectric absorption Neutron porosity how to see stored passwordsWebJan 20, 2024 · Total porosity from a density log would equate with the disaggregated oven-dried total porosity from cores. The neutron log, however, would enlarge the definition to include structural hydroxyl chemistry. Effective porosity. Oven-dried core analysis porosity includes the void space of all interconnected pores plus the volume of water bound to ... how to see storage usage on windows 10Web(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 how to see stored passwords in windows 10WebSecondary 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. how to see stories archive on facebook