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In the Minagish field, the Shuaiba formation has very low porosity and permeability, However, the presence of shrinkage<br>cracks, joints and fractures make it ideal disposal zones. Karsts feature south east of the Minagish structure, containing an<br>abundance of fractures and dissolution channels, have been identified for disposal. Karsts are formed by the passage of<br>meteoric water through the carbonate rock and dissolved the rock as it passed.