Extension and growth index show that the strength of fault movement of the Bijialing area in the early Tertiary had a migration from southwest to northeast.Tectonism controlled the formation, type and distribution of the sedimentary system.In the Sha－ 1 and Sha－ 2 time (the first and second time－ stratigraphic ages of the Shahejie Formation),strong movement along No.1 fault induced the fan delta deposition.Movements along No.1 fault in the early Dong－ 3 time (the third time zone of the Dongying Formation deposition) got weak, and movement along No.2 and No.3 faults became strong.These structural changes caused fan delta facies and braided river facies to be distributed in the southeast.In the later Dong－ 3 time,movement along No.1 fault was mostly weak,and intense movement along No.2 fault caused the braided river facies which was mainly distributed in the northeast.
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