Western Sichuan Depression The Middle Triassic To Be Four To Be Five Sections Of Sequence Stratigraphy And Sedimentary Facies

According to drilled well data,exposure datalogging data and so on, we have researched on the sequence stratigraphy,the types of sedimentary facies ,the sedimentary system, the beneficial reservoier facies which locates the Upper Triassic Series T₃x⁴ and T₃X⁵ in the West Sichuan Depression, by the comprehensive analyses of these data, the Sequence Stratigraphic Framework of the Upper Triassic Series T₃X⁴ and T₃X⁵ in the West Sichuan Depression has been built.which is the Upper Triassic Series T₃X⁴ and T₃X⁵ in the West Sichuan Depression are divided into two length-cycles(LSC₅～LSC₆), seven metaphase-cycles(MSC₁₇～MSC₂₃),series short-cycles , revealed there are the sedimentary system of alluvial fan-fan delta,fan-delta-delta,delta-lake ect ,built the sedimentary facies modle; in the end of this thesis, it is revealed that the bottom of ascension half cycle and the top of descending half cycle of two middle-terms cycle (MSC₁₇,MSC₁₉) is superior quality reservoir.