Field practice (geo H₂) — overview

This section covers the field practice of geologic-hydrogen exploration, from choosing a sensor to trusting the number it produces.

Pages, in reading order:

1. Geologic context — derives the soil-gas transport physics and lays out the 2023–2025 drilling-artifact controversy that governs whether any reading can be called geologic signal.
2. Soil-gas surveys — the operational how-to layer of probe hardware, purge protocols, and survey-grid design.
3. Environmental covariance — the statistical framework for separating a real hydrogen pulse from weather-driven sensor drift and signal swings.
4. Calibration, drift & QA/QC — the traceability chains, drift statistics, and uncertainty budgets behind every quoted ppm.
5. Helium, noble gases & co-tracers — the co-tracer suite (He, N₂, CH₄/CO₂, H₂S, radon) that turns a hydrogen reading into a geologic interpretation; helium is invisible to every optical sensor in this wiki.
6. Isotopic & genetic fingerprinting — the stable-isotope and noble-gas fingerprints (δD-H₂, δ¹³C/δD-CH₄, ³He/⁴He) that reveal where the H₂ came from — the only lab-grade way to tell deep geologic hydrogen apart from microbial, drilling, and industrial sources.
7. Downhole deployment — why a live downhole H₂ sensor does not yet exist as a product, and what borehole and mud-gas measurements are achievable today.