Abstract:

The Paleogene Dongying sag is an extensional half-graben that is cut in north and is overlapped in south, and develop many growth faults. Intensity of growth fault directly reflects structured intensity of sag, and controls creation, migration and congregation of combination gas. This article expresses intensity of growth fault by fault falls and calculates obviously active fault falls from the third subage of the Shahejie stage to Dongying Formation.During the early time of the third subage of the Shahejie stage, it has 45 obviously active faults and the maximum fall is 450 m; there has 47 ones during the middle time of the third subage and the maximum fall is 500 m; it has 49 ones from the late time of the third subage to the early time of the second subage and the maximum fall is 500 m; it has 49 ones from the late time of the second subage to the first subage and the maximum fall is 300 m; the early stage of the Dongying Formation has 45 ones and the maximum fall is 150 m, and the late stage has 38 ones,its maximum fall is 230 m.

Key words: growth fault, fault fall, Dongying sag, Paleogene