Study of Four-property Relationship and Lower Limit Effective Thickness of Penglaizhen Formation Tight Gas Reservoir in Shifang-Deyang-Guangjin Area

In order to improve the accuracy of predicting the favorable area of Penglaizhen Formation in Shifangdeyang-guangjin area,based on the data of core、logging,etc,we studied the characteristics and relationship of lithology、physical property、electrical property and hydrocarbon showings of Penglaizhen Formation. The results show that the degree of the tight gas reservoir enrichment is mainly influenced by lithology and physical property of reservoir. We choose natural gamma cure、resistivity curve、spontaneous potential curve and acoustic time curve data,established lithology、physical property and hydrocarbon showings well logging interpretation model. Then we compared the log interpretation results with the core analysis results,they are in good agreement which means the models are reliable. Ultimately we determined the effective thickness deviding standards of the gas reservoirs,which improved the coincidence rate of the gas-bearing formations of interpretation.