Difference analysis of Jurassic reservoir controlling factors in western area of Sichuan basin

Through the observation of core and cuttings slice, combined with particle sizes, physical properties, thin slice and so on, the controlling factors of reservoir differentiation are analyzed. The Jurassic reservoir consists of distributary channel sand body and mouth bar sandstone, the physical properties of the reservoir are controlled by sedimentation and diagenesis. Deposition mainly affects the physical properties of the reservoir through sedimentary microfacies and grain sizes, the coarse sand distributary channel and estuarine dam have the best physical properties of feldspar sandstone by Longmen mountain provenance body. Diagenesis controls pore evolution, and the destructive diagenesis of Shaximiao formation is stronger than that of Penglaizhen formation. In the sand body of mouth bar from Shaximiao formation and distributary channel sand body of Penglaizhen formation, the destructive diagenesis is weaker while the dissolution of easily dissolved minerals is stronger. After the diagenesis,the reservoir of the sand body of mouth bar from Shaximiao formation and the distributary channel sand body from Penglaizhen formation reserve much reserve space, which is a favorable exploration and development target.