# 📐 L2 Spec — Geothermal Reservoir — coupled thermo-hydraulic inversion Mismatch-Only Spec
**ID:** `L2-290-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-290`](/artifact/l1/L1-290)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554069
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | 0 – 40 |
| N cells | — | 100 – 1000000 |
| N times | — | 10 – 100000 |
| N wells | — | 1 – 100 |
| Rock cp error | — | 0.0 – 0.1 |
| Porosity error | — | 0.0 – 0.1 |
| Permeability error | — | 0.0 – 0.3 |
| Fracture mapping error | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
14.0 + 0.3*SNR_dB - 10.0*permeability_error - 30.0*porosity_error - 20.0*rock_cp_error - 8.0*fracture_mapping_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`d36d72a5825b6d94d8c67cf854f72eb161b8904ce102dda1c1d88e5ea479386e`
## 5. On-chain Registration
- **Chain hash:** `0xa56cb3f2fb4658ff07db63b7fd566b2bade174002d78d840740f13c8e9a4eb37`
- **Chain tx hash:** `0xb97173078e0796cbf465a4da68d75cff07a833b31561b7ab14c4c2be347745f5`
- **Chain block:** `41554069`
---
## File Mapping
This bundle consists of: `L2-290-001.md`, `L2-290-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-290-001.md` | Source of truth — edit this | Human or LLM |
| `L2-290-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-290-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._