RESERVOIR CHARACTERISTICS AND CONTROLLING FACTORS OF XUJIAHE FORMATION IN CHISHUI AREA, GUIZHOU
贵州赤水地区须家河组的储集特征及其发育影响因素

With 270~500 m thick and the higher maturity in this area, the Xujiahe formation. is the fluvial clastics beds overlying on the Middle Triassic Leikoupo formation with paraunconformity. The rock of Xujiahe formation mainly includes middle to thin grain feldspar quartz sandstone, lithic quartz sandstone and feldspar lithic quartz sandstone. The channel bars and point bars are the reservoirs developed facies; the diagenesis is the main controlling factors of reservoir development, in which, the compaction and pressure solution have the important effects to reduce reservoir porosity. The cementation of the autogenic minerals is also the one of the negative factors for the reservoir development. The construction diagenesis such as corrosion has little contribution on the reservoir development. The Xujiahe formation of this area is the very low porosity and permeability reservoirs with fracture and micro pore spaces.