Know your data sources.

Pan-EU harmonized offshore oil & gas — OGC WFS 2.0.0, no auth. 18 EU countries (Croatia, Cyprus, Denmark, Faroe Islands, France, Germany, Greece, Ireland, Italy, Latvia, Malta, Montenegro, Netherlands, Norway, Poland, Portugal, Spain, UK). Annual refresh — breadth filler; prefer sodir/nsta for authoritative national data. Layers: - hydrocarbons (~28.5K wells) ⭐ status/purpose/content/country filters - platforms (~1.6K) ⭐ currentStatus/category/primaryProduction - pipelines (~3.9K) ⭐ medium/status/country - activelicenses (~1.3K polygons) type/country

Kansas Geological Survey (KGS) — oil and gas wells (~515K), field polygons (~8K), and Class II UIC injection wells (~49K). - searchWells ⭐ 515,517 wells with operator, county Title Case, status, wellType, formation - searchOilGasFields ⭐ 8,089 field polygons (Active/Abandoned, Oil/Gas/Oil and Gas) - searchClassIIWells ⭐ 49,381 UIC Class II injection wells (EOR/SWD) - getWellByApi, getServiceInfo §0 spec drift: Hub kgs-gis-data-and-maps-ku is discovered via DCAT feed; underlying FS on services2.arcgis.com tenant ZOdjAzAQ2B0f85zi. STATUS column has 100+ codes (incl P&A suffix variants); WELL_TYPE separate. API_NUMBER dashed; API_NUM_NODASH 14-digit. CRS 102100; outSR=4326.

Norwegian Continental Shelf (NCS) open data — 9,765 wellbores, 142 fields, 645 discoveries, 1,809 licences, 82 pipelines, 1,215 facilities, 5,008 seismic surveys. - searchWellbores ⭐ operator/status/purpose/content/field/area/date - getWellbore ⭐ by name (e.g. '33/12-1') or NPDID - searchFields ⭐ Producing/Approved for production/Shut down - searchDiscoveries ⭐ status, HC type, operator, year range - searchLicences ACTIVE/INACTIVE polygons - searchPipelines medium (OIL/GAS), phase, facility - searchFacilities platforms, FPSOs, subsea — kind/phase - searchSeismicSurveys 2D/3D/4D acquisition areas - getWellboreFormationTops lithostratigraphy per wellbore - getWellboreDST drill stem tests per wellbore - getFieldReserves oil/gas/NGL/condensate reserves (multi-vintage)