Reservoir diagenesis and porosity evolution of Leikoupo Formation in Zhongba gas field of Sichuan Basin

In the Middle Triassic Leikoupo Formation of Zhongba gas field of northwestern Sichuan,the diagenetic evolution process of granular and crystalline dolomite reservoir was complex,in which the various diagenesis was developed,and the reservoir quality was clearly affected by the diagenesis.The primary porosity,e.g.bird's eye pore,biological coelom pore,intercrystalline pore and intergranular pore,almost completely disappeared after the compaction and pressure solution and the cementation by multiphase calcit...