Illinois State Geological Survey (ISGS) ILOIL well registry plus oil/gas/storage field polygons and waterflood-area boundaries via maps.isgs.illinois.edu. - searchWells ⭐ ~207K wells with API, status code+text, operator, formation, depth - searchOilGasFields ⭐ ~1K canonical 2024 unified oil + gas + gas-storage polygons (or ~550 legacy) - getWellByApi single well lookup, searchWaterfloodAreas, getServiceInfo §0 spec drift: brief listed Oil_Gas_GasStor_Fields_2023 — that service is 404. Canonical service is _2024. Wells layer is at index 8 of Wells/MapServer (NOT 0). STATUS column has 100+ codes; STATUS_TEXT has 100+ descriptive variants. Legacy service uses upper-snake fields, 2024 uses camelCase. Native CRS 102100; outSR=4326.
5 methodsFreshness not declaredMichigan EGLE oil and gas surface and bottom-hole locations, directional starts, and gas-storage field polygons via EGLE MiStar + DataMiner ArcGIS services. - searchSurfaceHoles ⭐ ~92.4K wells (DataMinerWells2; code WellStatus) - searchBottomHoles ⭐ ~96.6K — operator (co_name), formation (deep_fm), depth - searchGasStorageFields ⭐ ~61 storage-field polygons - searchDirectionalStarts (~95.3K), getWellByApi, getServiceInfo quirks: surface uses code WellStatus (PLA/PR/TP/ACT/SI/TA); bottom-hole uses descriptive ("Plugging Approved", "Producing"). No county column — use bbox/near. CRS 102100; outSR=4326. maxRecord=1000.
6 methodsFreshness not declared
Knowledge
Know your data sources.
The public data contract for every source PatchOps exposes over MCP: provenance, freshness, coverage, caveats, and per-method schemas. Also available as JSON at /api/knowledge/data-sources.
tag: gas-storage