Spheroidal “Cannonballs” calcite-cemented concretions from the Faiyum and Bahariya depressions, Egypt: evidence of differential erosion by sand storms
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DOI: 10.1007/s00531-019-01753-3
Abstract: The “cannonballs” concretions are very common geomorphic structures within the Eocene rocks in both the Faiyum and Bahariya depressions in Egypt (Plyusnina et al. 2016; Sallam et al. 2018). These concretions are spheroidal, hard and… read more here.
Keywords: cannonballs calcite; bahariya depressions; spheroidal cannonballs; calcite cemented ... See more keywords
Wormhole Formation During Acidizing of Calcite-Cemented Fractures in Gas-Bearing Shales
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DOI: 10.2118/191376-pa
Abstract: A relatively large number of calcite-cemented fractures are present in gas-bearing shale formations. During hydraulic fracturing, some of these fractures will be reactivated and may become important flow paths in the resulting stimulated fracture network.… read more here.
Keywords: gas; gas bearing; formation; cemented fractures ... See more keywords