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petrophysics

Calculate shale volume, porosity, water saturation, permeability, and brittleness index from wireline logs.

Updated Mar 5, 2026

Search Tags:#well logs #petrophysics #reservoir engineering #log interpretation #formation evaluation #brittleness index

Ready to run

npx skills add https://github.com/jpfielding/claude.pnge --skill petrophysics

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: petrophysics
Source: https://github.com/jpfielding/claude.pnge/tree/main/skills/petrophysics
Command: npx skills add https://github.com/jpfielding/claude.pnge --skill petrophysics

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill automates complex petrophysical log interpretation, enabling accurate formation evaluation and reservoir characterization, crucial for optimizing hydrocarbon recovery and completion strategies.

Core Features & Use Cases

Formation Property Calculation: Determine shale volume (Vsh), porosity (phi), and water saturation (Sw) using various industry-standard methods.
Reservoir Quality Assessment: Calculate brittleness index for completion design and estimate permeability from log data.
Use Case: A petroleum engineer needs to evaluate a new unconventional play. They can use this Skill to process wireline logs, calculate net pay, and assess the rock's brittleness to design an effective hydraulic fracturing program.

Quick Start

Calculate the shale volume using the Larionov method with an IGR of 0.6.

Frequently Asked Questions about petrophysics

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I calculate water saturation and porosity from well logs for formation evaluation?▼

Formation evaluation calculates water saturation, porosity, and shale volume from well logs using industry-standard equations and empirical correlations to determine reservoir properties and net pay.

What is the best way to assess reservoir brittleness index for hydraulic fracturing completion design?▼

Reservoir brittleness index is calculated from log data to assess completion quality, enabling petroleum engineers to design effective hydraulic fracturing programs for unconventional reservoirs.

Can I estimate permeability from wireline log data without requiring core measurements?▼

Permeability estimation from wireline log data is supported through empirical correlations, allowing you to assess reservoir quality and characterize the formation without direct core measurements.

How do I calculate shale volume using the Larionov method for unconventional reservoirs?▼

Shale volume is calculated using the Larionov method by inputting the gamma ray index (IGR), processing the log data to determine Vsh for reservoir characterization and pay zone identification.

Does this petrophysical log interpretation workflow support unconventional reservoir characterization?▼

Petrophysical log interpretation focuses on unconventional reservoirs, calculating properties like shale volume and brittleness index to optimize hydrocarbon recovery and completion strategies.