Abstract: The oolitic shoal facies reservoir of Feixianguan formation in Puguang gas field is characterized by big thickness, deep burial, strong heterogeneity and small difference in lithology between II- and III-type reservoirs and neighboring rock. This paper analyzes carbonate sparse spike inverse (CSSI) method and the key parameters, and highlights the fair wavelet extraction, fine reservoir calibration and exact geologic modeling, etc. The spatial distribution of reservoir is predicted quantitatively using the limits between petrophysical parameters of the reservoir and non-reservoir. This method has been applied to the main development well locations design of Puguang gas field, with the prediction rate of 83.9%, which can be as a guide for quantitative prediction of surrounding blocks in Puguang gas field.

Key words: Puguang gas field, carbonate rock, oolitic shoal reservoir, CSSI, petrophysical modeling