Diagenesis and geochemistry of dolomite and its influences on the reservoir characteristic of Dalan and Kangan formations in the South Pars Field

Abstract:
      Reservoir rocks of the South Pars field, which is one of the largest gas fields in the world, are Dalan (late Permian) and Kangan (Early Triassic) formations. Pervasive dolomitization has deeply influenced these formations and their reservoir characteristics. Petrographic and geochemical studies reveal different types of dolomites including dolomicrite formed in the Sabkha and mixing zone coarse crystalline dolomites. Porosity and permeability show substantial increase when large dolomite crystals formed well-connected framework