Abstract:

Several tight lithologic gas fields with low permeability have been found in the north of Ordos Basin. From bottom to top,their main gas-bearing strata are the Taiyuan Formation of the Upper Carboniferous,the Shanxi Formation and lower Shihezi Formation of the Lower Permian.In view of the characteristics of lithologic traps and tight clastic reservoirs with low-permeability,studies are performed on integrated seismic reservoir prediction and characterization techniques for exploration and production of these gas fields.Corresponding techniques,including rock physics analysis,seismic attribute optimization,frequency decomposition and stochastic simulation inversion,are developed and applied.They form a complete series of reservoir prediction techniques that are suitable for tight clastic reservoirs with low porosity and low permeability,and can enhance the accuracy of reservoir prediction and promote the development process of tight gas fields in Ordos Basin.

Key words: tight reservoir, reservoir recognition, seismic reservoir prediction, Ordos Basin