Analysis on Controlling Factors and Characteristics of Sandstone Reservoir  of He 8 (Upper Paleozoic) in the Northern Ordos Basin

Key words: 
• reservoir characterization /
• controlling factor /
• He 8 Formation /
• Ordos Basin

Abstract: By analyzing the thin sections and physical property,the petrology character, poroperm characteristics, pore texture and pore types of the reservoir of the He 8 Formation in the north of Ordos basin were tested, and the reservoir performance’ major influencing factor were analyzed. The result indicates that the reservoir of He 8 Formation which deposited in braidedstream have high compositional maturity and media textural maturity, the reservoir germinates secondary corroded pore and kaolinite intercrystalline pore primarily, microporetransitional pore was primary oil gas reservoir space, the micro larynx and thinness larynx were the basic seepage passage, and it is typical medialow hole, special hypotonic reservoir. In plan, the reservoir's physical property is controlled by provenance and sedimentary facies zone. In vertical directions, the compaction and cementation lead poov reservoir’s physical property, whereas secondary pores produced by dissolution result in the enhancement of reservoir property.