Taking the Daniudi Gasfield as an example,the genesis of the physical property of the tight sand stone reservoir is discussed in detail by comprehensively studying on these sedimentology,lithology and diageneses of the reservoir based on core,well logging,and chemical examination data.It showes that the distribution of microfacies decides the spatial distribution of reservoir property,while diageneses controls the reservoir space characteristics and capability in which compaction and cementation has damagin...