Porosity from sonic log

Author: yltl

August undefined, 2024

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 … WebJan 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]:

secondary porosity index Energy Glossary - Schlumberger

WebThe sonic or acoustic log measures the travel time of an elastic wave through the formation. This This information can also be used to derive the velocity of elastic waves through the … 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: ∅= marvis products

Sonic logs - SEG Wiki - Society of Exploration Geophysicists

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. WebThis 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 … 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 … marvis north wildwood

Why Porosity From Density Log is Preferred Over Neutron …

Standard interpretation - AAPG Wiki

WebThe most critical parameter to calculate sonic porosity is perhaps the matrix compressional travel time Δt matrix . It is not only usually unknown, but in many reservoirs is not a constant parameter, but a curve that depends on the variable column lithology, its matrix fabric, and rock's stiffness. marvis productionWebporosity can be known by using a combination of at least two of these logs. The lack of these porosity tools makes the determination of porosity difficult. At present, there are … marvis pro review

"WebThe sonic log is used to develop dynamic rock properties which are then converted to static properties when calibrated against results from triaxial and ... North Sea core logs, focusing on the effect of sonic slowness, porosity and Young’s Modulus. Lal [12] concluded that the primary factors affecting shale ... " - Porosity from sonic log

Porosity from sonic log

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. WebTHIS 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.

Did you know?

WebInduced porosity can be subdivided into three groups based on the most dominant geological process: (1) Solution porosity: Channels due to the solution of rocks by circulating warm or hot solutions; openings caused by weathering, such as enlarged joints and solution caverns; and voids caused by organisms and later enlarged by solution. (2) WebJan 18, 2024 · Each of the porosity tools—density, compensated neutron, sonic, and photoelectrical effect—can be used to estimate porosity when lithology and fluid properties are known. ... A typical presentation of a compensated neutron measurement is shown in the log in Figure 2. Sonic. Sonic devices measure the velocity of various acoustic waves, …

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), … WebOct 31, 2024 · It is also possible creating a porosity log from S-wave slowness through the rock physics model used in the algorithm. The method was applied in compacted …

WebDec 4, 2024 · Figure 6: Sonic Logs and Seismic Ties Array sonic logs were developed to provide information about a variety of acoustic properties such as porosity, permeability, … WebJan 1, 1979 · In clean sandstone of 20 percent porosity the sonic log will give a reading of about 80 (msec/ft), in limestone and dolomite about 75 (msec/ft). The simultaneous compensated neutron formation density tool is a combination of three logs, a compensated neutron porosity (%), a bulk density (g/cc) and a gammaray log.

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 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 ... huntington bank auburn michiganWebThe porosity type of the Kangan reservoir (oolitic grainstone of shoal facies belt in Ka-2 reservoir zone) is isolated moldic and vuggy those generates high porosity and low permeability values... marvis pancake houseWebCalculating Porosity. Many relationships between travel time and porosity have been proposed, the most commonly accepted is the Wyllie time-average equation. The equation … huntington bank auburn hillsWebMar 13, 2024 · Porosity is the void or space inside the rock, they are very useful to store fluids such as oil, gas, and water, they are also able to transmit those fluids to a place with … huntington bank auction foreclosed homesWebMay 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... marvis official siteWebJun 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. marvis playerWebJan 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. … marvis pancake house north wildwood