Impact of diagenesis on the pore evolution and sealing capacity of carbonate cap rocks in the Tarim Basin, China

performance.Class I cap rocks present the best sealing capacity because they underwent intense mechanical compaction, abundant chemical compaction and calcite cementation, which contributed to the heterogeneous pore structures with poor pore connectivity.A four-stage conceptual model of pore evolution of cap rocks is presented to reveal how the diagenetic evolution of cap rocks determines the heterogeneity of their sealing capacity in carbonate reservoirs.