Paleokarst system structures form an important type of carbonate reservoir, and are product of surface karst processes, further sediment compaction and diagenesis, all of which can contribute to the heterogeneity development and compartmentalization of a carbonate reservoir. One of the most important conditions is when the cave is filled by solid minerals such as anhydrite. Filling of the cave by Minerals and further compaction during area subsidence can destroy much of the original cavern porosity and significantly decrease the reservoir quality of the formation. For this reason, during the design stage of exploration and production drilling, it is necessary to pay attention on the pattern and distribution of paleokarst systems, make an assessment of their impact on reservoir properties which might affect the reservoir quality.

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