### Improved estimation of mineral and fluid volumetric ...

Improved estimation of mineral and fluid volumetric concentrations from well logs in thinly bedded and invaded formations Zoya Heidari1, Carlos Torres-Verdín2, and William E. Preeg3 ABSTRACT Calculation of mineral and fluid volumetric concentrations from well logs is one of the most important outcomes of forma-tion evaluation.

More### Interval mineral and fluid densities estimation from well ...

Dec 01, 2020 The statistical estimation of mineral and fluid densities is established from an assumption that is also valid in conventional deterministic well-logs inversion methods: there are representative linear models between volumetric concentrations and individual properties of each petrophysical constituent (Mayer, 1980).

More### Improved estimation of mineral and fluid volumetric ...

After the mineral model is constructed and a set of initial values are established, nonlinear joint inversion estimates mineral and fluid concentrations from conventional well logs.

More### Improved estimation of mineral and fluid volumetric ...

Improved estimation of mineral and fluid volumetric concentrations from well logs in thinly bedded and invaded formations

More### A NOVEL WIRELINE LOGS BASED APPROACH FOR

formula for the assessment of mineral concentrations in oil- or gas-bearing shale. The radial basis function (RBF) network can be used to construct the mapping between well logs and mineral concentration. In this work, the basic principle of RBF is discussed in detail, including network structure, basis function, and network training method.

More### Improved estimation of mineral and fluid volumetric ...

More importantly, lin-ear estimation methods do not explicitly account for shoulder-bed and/or invasion effects on well logs nor do the account for differences in the volume of investi-gation of ...

More### How to estimate RHOM Matrix Density estimation from well logs

The figure below ↓ shows a log plot with RHOM estimates through a mineral solver and neutron to density contrast Using techniques that combine both core data and log curves. When a well log has also a companion core data set, it is advisable to combine both sources of information to produce an unified consistent estimate of RHOM.

More### FACT SHEET Mineral Resources and Reserves Estimation

Mineral resources are constrained by geology (i.e. certain deposit types only occur in specific geological settings) and by their very nature have a geographical location. Resource estimation occurs at the individual mineral deposit scale, although this can be hugely variable between hundreds of thousands of tonnes and many billions of tonnes.

More### Numerical Methods for Mineral Estimation from Well Logs ...

On a crossplot the log data are plotted in a Cartesian space, where the measurement logs are orthogonal reference axes. Finally if reference minerals are located in this log space, then the plotted zones can be remapped into a "composition space". Their coordinates in composition space are estimates of the proportions of the reference minerals.

More### Improved estimation of mineral and fluid volumetric ...

More importantly, lin-ear estimation methods do not explicitly account for shoulder-bed and/or invasion effects on well logs nor do the account for differences in the volume of investi-gation of ...

More### Comparative Study for the Interpretation of Mineral ...

After the mineral model is constructed and a set of initial values are established, nonlinear joint inversion estimates mineral and fluid concentrations from conventional well logs. An iterative refinement of the mineral model can be necessary depending on formation complexity and data quality.

More### KGS--Geological Log Analysis--Mineral Composition Profiles

The estimation of the composition profile that now includes porosity is simply an expansion of the matrix algebra solution of the three-mineral system. Next, we will compare this EXCEL-driven result with the "Cyberlook" processing of the Viola Limestone in this well by the Schlumberger logging engineer.

More### Mathematical Minerals: A History of Petrophysical ...

Jun 26, 2018 The estimation of mineral composition from petrophysical logs is now a standard feature on any log analysis software package. However, the degree to which these estimates match reality is highly variable and requires a knowledgeable and experienced user to work with powerful procedures.

More### Well logging - Wikipedia

Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole.The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs).Some types of geophysical well logs can be done ...

More### Integrated analysis of well logs and seismic data to ...

Nov 01, 2008 Gas hydrate saturations from the resistivity log were estimated using the Archie equation (Archie, 1942).To estimate gas hydrate saturation, resistivities of water-saturated sediments are calculated using variable R a, which is R a = aR w, where a is the Archie parameter and R w is the resistivity of connate water. The heavy red line in Fig. 2A, which is averaged over 15 m, is the

More### Petrophysical evaluation of well log data and rock physics ...

Jul 28, 2017 Petrophysical evaluation of well log data has always been crucial for identification and assessment of hydrocarbon bearing zones. In present paper, petrophysical evaluation of well log data from cluster of six wells in the study area is carried out in combination with rock physics modeling for qualitative and quantitative characterization of Eocene reservoir in Chandmari oil field of Assam ...

More### Element Concentrations in Soils and Other Surfici ...

The low concentrations of many elements in soils characterize the Atlantic Coastal Plain. Soils of the Pacific Northwest generally have high concentrations of aluminum, cobalt, iron, scandium, and vanadium, but are low in boron. Soils of the Rocky Mountain region tend to have high concentrations of copper, lead, and zinc.

More### ANALYSIS OF ASH AND MINERALS - UMass

4. Analysis of Ash and Minerals . 4.1 Introduction. The “ash content” is a measure of the total amount of minerals present within a food, whereas the “mineral content” is a measure of the amount of specific inorganic components present within a food, such as Ca, Na, K and Cl.Determination of the ash and mineral content of foods is important for a number of reasons:

More### POROSITY LOGGING

Sonic log: If a sonic log is used for porosity estimation, the equivalent relationship is: [email protected],+(l-#)At,, where At is the zone transit time, 4 is the porosity, Atma is the matrix transit time, and Atf is the pore fluid transit time. The computation of porosity requires the stipulation of a matrix mineral

More### Partition coefficient - Wikipedia

The partition coefficient, abbreviated P, is defined as a particular ratio of the concentrations of a solute between the two solvents (a biphase of liquid phases), specifically for un-ionized solutes, and the logarithm of the ratio is thus log P.: 275ff When one of the solvents is water and the other is a non-polar solvent, then the log P value is a measure of lipophilicity or hydrophobicity.

More### Log analysis for unconventionals - SEG Wiki

Jan 04, 2018 Fig. 2: Well A logs. From left to right, total GR, the corrected GR for uranium and its normalized readings (thick black curve), neutron porosity and density, density porosity and the comparison between the estimated shale volumes (Vsh Grn, Vsh NPHI, Vsh PHI).Shale volumes calculated with the three methods follow the separation trend between NPHI and RHOZ except in the

More### A novel wireline logs based approach for assessment of ...

Jun 01, 2014 The pores of organic shale are small and its mineral composition is complex. It is difficult to calculate mineral concentrations. Several wireline logs are sensitive to the logging responses of reservoirs, but the relations between the logs and mineral concentrations are not linear, so it is difficult to determine the volumetric concentration of minerals.

More### Numerical Methods for Mineral Estimation from Well Logs ...

On a crossplot the log data are plotted in a Cartesian space, where the measurement logs are orthogonal reference axes. Finally if reference minerals are located in this log space, then the plotted zones can be remapped into a "composition space". Their coordinates in composition space are estimates of the proportions of the reference minerals.

More### Integrated analysis of well logs and seismic data to ...

Nov 01, 2008 Gas hydrate saturations from the resistivity log were estimated using the Archie equation (Archie, 1942).To estimate gas hydrate saturation, resistivities of water-saturated sediments are calculated using variable R a, which is R a = aR w, where a is the Archie parameter and R w is the resistivity of connate water. The heavy red line in Fig. 2A, which is averaged over 15 m, is the

More### Log analysis for unconventionals - SEG Wiki

Jan 04, 2018 Fig. 2: Well A logs. From left to right, total GR, the corrected GR for uranium and its normalized readings (thick black curve), neutron porosity and density, density porosity and the comparison between the estimated shale volumes (Vsh Grn, Vsh NPHI, Vsh PHI).Shale volumes calculated with the three methods follow the separation trend between NPHI and RHOZ except in the

More### A log based analysis to estimate mechanical properties and ...

logs (such as sound velocity or density) and mechanical properties, such as uniaxial compressive strength. Due to rapid increase in developing unconventional reservoirs, in particular in Australia, in this study we applied the log based analysis as a case study to a shale gas well

More### Attempt of Bayesian Estimation from Left-censored Data ...

It is well known that conventional substitution method often used in food analytical science cause severe bias. To estimate appropriate summary statistics on Cr(VI) concentration in mineral water products, parameter estimation using the Markov chain Monte Carlo (MCMC) method under assumption of a lognormal distribution was performed.

More### Prestack Waveform Inversion and Well Log Examination at ...

Gas hydrates are naturally occurring compounds, which, at a molecular scale, are lattice structures of ice embedded with various gas molecules in the lattice voids. Volumetric estimates of associated hydrocarbons vary greatly due to the difficulty in remotely estimating hydrate concentrations in marine sediments but embedded hydrocarbon stores are thought to represent a significant portion of ...

More### Element Concentrations in Soils and Other Surfici ...

The low concentrations of many elements in soils characterize the Atlantic Coastal Plain. Soils of the Pacific Northwest generally have high concentrations of aluminum, cobalt, iron, scandium, and vanadium, but are low in boron. Soils of the Rocky Mountain region tend to have high concentrations of copper, lead, and zinc.

More### POROSITY LOGGING

Sonic log: If a sonic log is used for porosity estimation, the equivalent relationship is: [email protected],+(l-#)At,, where At is the zone transit time, 4 is the porosity, Atma is the matrix transit time, and Atf is the pore fluid transit time. The computation of porosity requires the stipulation of a matrix mineral

More### ANALYSIS OF ASH AND MINERALS - UMass

4. Analysis of Ash and Minerals . 4.1 Introduction. The “ash content” is a measure of the total amount of minerals present within a food, whereas the “mineral content” is a measure of the amount of specific inorganic components present within a food, such as Ca, Na, K and Cl.Determination of the ash and mineral content of foods is important for a number of reasons:

More### Determination of Calcium, Magnesium, and Sodium by Atomic ...

the concentrations of Ca2+ and Mg2+ in both cold and hot tap water, and in “unknown” challenge samples. You can bring your tap water from home or use some from the school. We also recommend that you bring a bottle of mineral water and test it as an unknown, since these samples typically contain high levels of both cations.

More### Mineral requirements of fish: a systematic review - Antony ...

In general, weight gain as the criterion resulted in a lower estimate (by 18–42%) than those obtained using whole‐body or vertebral mineral concentrations as response criteria. The analysis also showed that different fish species do not show large variations in the mineral and trace element concentrations in the whole body and tissues.

More### How to Estimate Statistically Detectable Trends in a Time ...

Concentrations of exchangeable Mg, Ca and K at 0 to 7.5 cm initially decreased and then increased, with break points estimated at 1991, 1996, and 1988, respectively. From 7.5 to 60 cm, concentrations of exchangeable Mg, Ca and K decreased throughout the time series, with the sole exception of exchangeable K at 15 to 35 cm, which increased.

More### Estimation of Fluorine Concentrations in Fluids of ...

Estimation of Fluorine Concentrations in Fluids of Mineralized Skarn Systems ANATOLY M. AKSYUK† Institute of Experimental Mineralogy, Russian Academy of Sciences,Chernogolovka, Moscow District, 142432 Russia Abstract The experimentally calibrated phlogopite and biotite fluorimeters and the experimental results for mineral-

More### Radioanalytical investigations of uranium concentrations ...

It was below 10%; typically 4% (3-9.5%) a In this case waters were measured earlier as well and results can be found elsewhere for samples 9-15 [9] and for samples 17 and 18 [17] [24] 0.5-7.7 0.5-13.6 [25] a Natural uranium was measured in smaller amount (0.1-0.5 L day -1 ) and mostly by adults.In special cases mineral water consumption might ...

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