rock-physics-avo

rock-physics-avo is a skill for Claude Code, Codex from SteadfastAsArt/geoscience-skills. It costs 52 tokens per session (2,413 once invoked), scanned A, original, MIT.

A workflow for studying how rocks affect seismic waves, from cleaning well logs to calculating rock properties, modelling AVO, and creating synthetic seismograms. AVO means analysing how seismic reflections change with angle.

In plain words
What is it for?
Use it to prepare LAS or DLIS well logs, calculate elastic properties, model fluid changes with Gassmann equations, estimate AVO responses, and tie synthetic results to seismic data.
Why use it?
It brings the main steps of a rock-physics and seismic-feasibility study into one workflow, reducing manual handoffs between well data, rock calculations, and seismic modelling.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to prepare LAS or DLIS well logs, calculate elastic properties, model fluid changes with Gassmann equations, estimate AVO responses, and tie synthetic results to seismic data.

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Install with agentmods
npx agentmods add skills/steadfastasart/geoscience-skills/rock-physics-avo
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add SteadfastAsArt/geoscience-skills --skill rock-physics-avo
Clone the repo
git clone --depth 1 https://github.com/SteadfastAsArt/geoscience-skills

Made for: Claude Code, Codex.

Its marketplace also offers this one on its own, as the plugin rock-physics-avo/plugin install rock-physics-avo after adding the marketplace above.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for rock-physics-avo

README.md
[![agentmods](https://agentmods.dev/badge/skills/steadfastasart/geoscience-skills/rock-physics-avo/github.svg)](https://agentmods.dev/skills/steadfastasart/geoscience-skills/rock-physics-avo)
Your own site
<a href="https://agentmods.dev/skills/steadfastasart/geoscience-skills/rock-physics-avo"><img src="https://agentmods.dev/badge/skills/steadfastasart/geoscience-skills/rock-physics-avo/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for rock-physics-avo

Your own site · 80×15
<a href="https://agentmods.dev/skills/steadfastasart/geoscience-skills/rock-physics-avo"><img src="https://agentmods.dev/badge/skills/steadfastasart/geoscience-skills/rock-physics-avo.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,413 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00052 $0.02413
Opus 5 $0.00026 $0.01207
Sonnet 5 $0.00010 $0.00483
Haiku 4.5 $0.00005 $0.00241

Measured 12d ago against content hash e7018817754d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

rock-physics-avo scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

workflows/rock-physics-avo/SKILL.md · 241 lines

How it starts

The opening of the file, as written. The whole thing — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Rock Physics & AVO Workflow

End-to-end pipeline for rock physics analysis and AVO feasibility studies, from well log preparation through elastic property calculation, Gassmann fluid substitution, AVO modelling, and synthetic seismogram generation.

Skill Chain

lasio / welly          bruges                    segyio / obspy
[Well Log Prep]     --> [Rock Physics]         --> [Synthetics / Tie]
  |                      |                          |
  Load LAS/DLIS          Elastic moduli             Wavelet extraction
  QC & despike           Gassmann fluid sub         Reflectivity series
  Resample curves        AVO intercept/gradient     Convolve synthetic
  Extract Vp, Vs, rho    Backus averaging           Well-seismic tie

Decision Points

Task Library When to Use
Load well logs lasio / dlisio Always the first step
Curve QC and management welly Multi-curve processing, despiking
Elastic moduli, AVO equations bruges Core rock physics calculations
Gassmann fluid substitution bruges Predict fluid replacement effects
Wavelet extraction from seismic segyio + bruges When tying to seismic
Synthetic seismogram bruges Generate reflectivity and convolve
Dispersion curves disba Surface wave rock physics

Step-by-Step Orchestration

Stage 1: Well Log Preparation (lasio + welly)

import lasio
import numpy as np
from welly import Well

# Load well with sonic, density, and shear sonic
las = lasio.read('well.las')
df = las.df().dropna()

# Extract elastic logs
depth = df.index.values
vp = 1e6 / df['DT'].values       # P-wave velocity (m/s) from sonic (us/ft)
vs = 1e6 / df['DTS'].values      # S-wave velocity (m/s) from shear sonic
rho = df['RHOB'].values * 1000   # Density (kg/m3) from g/cc

# QC: check ranges
assert np.all(vp > 1500) and np.all(vp < 7000), "Vp out of range"
assert np.all(vs > 500) and np.all(vs < 4000), "Vs out of range"
assert np.all(rho > 1500) and np.all(rho < 3200), "Density out of range"

# If no shear sonic, estimate from Vp
# Castagna mudrock line: Vs = 0.8621 * Vp - 1172.4 (m/s)
if 'DTS' not in df.columns:
    vs = 0.8621 * vp - 1172.4
    vs = np.maximum(vs, 300)  # Floor for shallow sediments

Read the full file on GitHub · 241 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 241 lines · 52 tokens per session scan A e7018817754d

Subscribe to this mod's changes

rock-physics-avo is a skill published in the GitHub repository SteadfastAsArt/geoscience-skills (59 stars, last pushed 5mo ago), licensed MIT. It adds 52 tokens to every session and 2,413 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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