{"release_id":"seed-2026-09-15","data_as_of":"2026-09-15","entity_type":"field","source_code":"GRK","slug":"grijpskerk-grk","name":"Grijpskerk","mineral":"Gas","source_status":"UGS","source_status_description":"Underground gas storage","operator":"Nederlandse Aardolie Maatschappij 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zijn bronrecords, geen fysieke putten","sources":[{"name":"NLOG","url":"https://www.nlog.nl/nlog-mapviewer/field/GRK"}]}