The Northeastern Sichuan Triassic Feixianguan Diagenesis And Reservoir Research

Based on the principle and methods of carbonate sedimentology and reservoir diagenesis, and guided by the theories of carbonate reservoir geology, the diagenesis, controlling factors for reservoir and distribution of reservoir of Feixianguan Formation in northeast Sichuan have been comprehensively studied. Multiple methods from different branches of geology and advanced analyze and test technology have been used in mis research. The type and characteristics of diagenesis are described in detail, burial solution model and dolomitic model established, diagenetic environment and diagenetic stage divided. Diagenetic evolutionary series of sediments in bank and non-bank are put forward. What's more, the type and characteristics of reservoir space, pore structure characteristics, petrophysical parameters and lithologic characteristics are comprehensively studied, according to which we classify and value the reservoir. Furthermore factors controlling the formation of reservoir are analysed and reservoir evolutionary models are established. Finally regional distribution of reservoir has been predicted.Study suggests that Feixianguan formation is essentially controlled by sedimentation and diagenesis. Under their influence best-quality reservoir ( I + II) are distributed in platform edge oolitic beach along Luojia 1 Well-Po 2 Well and in vertical distributed in the central and upper part of the second section of Feixianguan formation.