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Neutron-Density Crossover Gas Zone & True Porosity Calculator

Easily calculate and compute neutron-density crossover gas zone & true porosity calculator with accurate equations, live formulas, and expert guidance.

Porosity calculated from bulk density log (e.g. 0.28 = 28%).

Hydrogen index porosity from compensated neutron log.

Formation clay/shale volume fraction.

Calculated Result
21.5 %

True Porosity (ϕ)

True Porosity (ϕ)

21.5 %

True Total Porosity Percent

21.5

Neutron Density Crossover Delta

0.16

Hydrocarbon Fluid Indication

POSITIVE GAS CROSSOVER (Low Hydrogen Density Gas Present)

Gaymard Poupon Gas Porosity

21.5

21.5 — %

Calculation Breakdown

  1. Applied FormulaCorrects apparent neutron and density porosities in low-density gas zones to determine true formation pore volume using the Gaymard-Poupon formula.\phi = \sqrt{\frac{\phi_D^2 + \phi_N^2}{2}}, \quad \text{Gas Crossover: } \phi_D > \phi_N

Gas Crossover Porosity Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.05.4111622True Porosity (ϕ)

What Is the Neutron-Density Crossover Gas Zone & True Porosity Calculator?

This tool computes neutron-density crossover gas zone & true porosity calculator with high precision arithmetic.

How Does the Neutron-Density Crossover Gas Zone & True Porosity Calculator Work?

Corrects apparent neutron and density porosities in low-density gas zones to determine true formation pore volume using the Gaymard-Poupon formula.

Neutron-Density Crossover Gas Zone & True Porosity Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

ϕ=ϕD2+ϕN22,Gas Crossover: ϕD>ϕN\phi = \sqrt{\frac{\phi_D^2 + \phi_N^2}{2}}, \quad \text{Gas Crossover: } \phi_D > \phi_N

Corrects apparent neutron and density porosities in low-density gas zones to determine true formation pore volume using the Gaymard-Poupon formula.

How to Use the Neutron-Density Crossover Gas Zone & True Porosity Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Neutron-Density Crossover Gas Zone & True Porosity Calculator Example

Input Values:

densityPorosityPhiD:0.28
neutronPorosityPhiN:0.12
shaleVolumeFractionVsh:0.05
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required %.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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