From 055fbb60facf92bb191537ce3a8508a566d8be18 Mon Sep 17 00:00:00 2001
From: Magne Sjaastad <magne.sjaastad@ceetronsolutions.com>
Date: Fri, 11 Sep 2026 15:26:00 +0200
Subject: [PATCH] #14709 RimReservoirGridEnsemble: Auto-import per-realization
 formation zone files

---
 .../ProjectDataModel/RimReservoirGridEnsemble.cpp         | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ApplicationLibCode/ProjectDataModel/RimReservoirGridEnsemble.cpp b/ApplicationLibCode/ProjectDataModel/RimReservoirGridEnsemble.cpp
index 0663488b08..a6b2bc801c 100644
--- a/ApplicationLibCode/ProjectDataModel/RimReservoirGridEnsemble.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimReservoirGridEnsemble.cpp
@@ -37,6 +37,7 @@
 #include "EnsembleFileSet/RimEnsembleFileSetTools.h"
 #include "Formations/RimFormationNames.h"
 #include "Formations/RimFormationNamesCollection.h"
+#include "Formations/RimFormationTools.h"
 #include "Rim2dIntersectionViewCollection.h"
 #include "RimCaseCollection.h"
 #include "RimDataFilterCollection.h"
@@ -1049,6 +1050,13 @@ void RimReservoirGridEnsemble::createCaseObjects()
         resultCase->setGridFileName( gridFile );
         // DO NOT call openEclipseGridFile() here - deferred loading
 
+        // Auto-import per-realization formation zone file (.lyr), if present next to the grid file.
+        auto folderNames = RimFormationTools::formationFoldersFromCaseFileName( gridFile );
+        if ( RimFormationNames* formations = RimFormationTools::loadFormationNamesFromFolder( folderNames ) )
+        {
+            resultCase->setFormationNames( formations );
+        }
+
         RimProject::current()->assignCaseIdToCase( resultCase );
         m_caseCollection->reservoirs().push_back( resultCase );
     }