Research On Diagenesis And Reservoirs Characters Of Sandstone Of The Upper Paleozoic In Huanghua Depression

According to the study of both core and casting thin sections, analyzing thelithologic features and physical property, The sandstone reservoir show thecharacteristics of low porosity and low permeability reservoir In the study area. Theresult indicated that the main sandstone reservoir rocks of Upper Paleozoic on theHuanghua depression consist of fine sandstone , siltstone, muddy siltstone and sandymudstone of which fine sandstone are the best reservoir rocks. quartz is a majorcomponent of terrigenous rock fragment. Three reservoir are shown to BenxiFormation, Taiyuan Formation, Shanxi Formation, Lower Shihezi Formation, upperShihezi Formation and Shiqianfeng Formation from bottom to top. the maturity ofcomponent and texture of the sandstone reservoir are gradually decline.The character of Huanghua depression reservoir during Carboniferous-Permiantime shows that he favorable sandstone body composed of delta and river sand bodiesdelta bodie is commonly developed in Shanxi Formation, fluvial sand body iscommonly developed in Lower Shihezi Formation and Upper Shihezi Formation.The pore of sandstone reservoir of Huanghua depression reservoir duringCarboniferous-Permian time are mainly intergranular pore, intragranular pore andfracture, secondary solution pores is beneficial to improve the reservoir quality.The influence was caused by Diagenesis of the sandstone reservoir is veryobvious, compaction is to reduce the original porosity of sandstone, carbonatecementation and quartz overgrowth is to make the sandstone porosity andpermeability decline, Dissolution is an important method to improve storagephysical properties of sandstoneThe sandstone reservoir show the characteristics and pore structure featuresin-depth study of the study area under the sandstone reservoir for low permeabilityand low porosity.The main reservoir space of the reservoir is secondary dissolution pore ,The study indicates that the reservoir is controlled and influenced bysedimentary facies and diagenesis. Dissolution is the most important affecting factoron improved the nature of the secondary pores.