Abstract:

        The Shanghe oilfield presents obviously stepping distribution of multi-ordered  tectonic belts and multi-level slope belts  from north  to south, and clastic  reservoir properties also have apparent  regular pattern due  to  the structural  features. By means of analyzing a  large amount of data of  reservoir properties, combined with structure  research,  it  is considered  that  the reservoir properties of  the same stratum  in  the Shanghe oilfield are getting gradually worse and worse  from  the Shang 1 area, through the Shang 2 area and the Shang 3 area up to the Shang 4 area in the direction  from north to south. But within the same area,  the  reservoir properties are getting worse and worse with  increasing burial depth. The boundary  faults of  the Shanghe oil field are primarily syndepositional faults, and the stratum depths of different blocks are thickened from north to south because of syndepositional growth faulting. Consequently, the variation of formation thicknesses controlled by synsedimentary fault activity is
the main influential factor of the reservior property differences for the same stratum in different areas of the Shanghe oilfield.

Key words: Shanghe oilfield, reservoir property, syndepositional faults, formation thickness