Study on Tight Reservoir Diagenetic Facies of Penglaizhen Formation in Shifang-Deyang-Guangjin Area of Western Sichuan Forland

Based on data of cast-slice,SEM analysis and core analysis data,the types of diagenetic facies of Penglaizhen Formation in western Sichuan Foreland were distinguished,logging cure features of diagenetic facies was discussed,lateral distributions was examined,porosity and permeability,main controlling factors of diagenetic facies. The results demonstrate that the reservoirs can be divided into four types of diagenetic facies,including corroded porosity diagenetic facies,porphyritic corroded porosity diagenetic facies,cemente tight diagenetic facies and compacte tight diagenetic facies. LLS、LLD、CNL、DEN、AC and GR logging cures build logging identification standards of diagenetic facies were used. MJ102 was used as an example in order to study the distribution of diagenetic facies,the sedimentary facies and lateral distribution of diagenetic facies of the third sand group of third Penglaizhen Formation were compared. The results demonstrate that the distribution of diagenetic facies is mainly controlled by sedimentary environment,the best porosity and permeability are developed in corroded porosity diagenetic facies and porphyritic corroded porosity diagenetic facies of channel.