Diagenesis and Pore Evolution of Gravityflow Channel Sandbody in Shahejie Formation, Qinan Depression

Key words: 
• gravityflow channel sandbody /
• diagenesis /
• pore evolution pattern

Abstract: Sedimentary facies controls plane distribution of reservoir and diagenesis controls its vertical zonation. Establishing detailed diagenesis pattern according to distinctive geology background and microfacies types is crucial for reservoir evaluation. In this paper, according to the analyses of sedimentary facies distribution and vertical sequence, by using rock thin sections, scanning electron microscope (SEM), cathodoluminescence, Xdiffraction, paleogeotemperature for the 42 sandstone samples of Shahejie Formation, it is summarized that there are 2 types of diagenesispore evolutions model ,i.e. main gravityflow channel sandbodies，and flankdistal sandbodies of gravityflow channel, which indicating that the center part of the main gravityflow channel sandbodies is potential exploration targets.