饶阳凹陷留北地区新近系河流相沉积模式

doi:10.13278/j.cnki.jjuese.201504106

Abstract

Abstract:

To understand the distribution of fluvial reservoirs, we investigated the fluvial sand bodies' characteristics and influencing factors of Neogene in Liubei area of Raoyang sag through combining the strata correlation, sedimentary facies, and main faults characteristics. The results showed that the sand bodies of the ultra short-term cycles of Neogene in Raoyang sag appeared as a belt distribution in plane, and the main extending direction was substantially paralleled to the boundary faults that controlled the depression. The main faults of NE and NEE in Liubei area still show the growing characteristics inherited from Neogene. Controlled by the inherited NE and NEE faults, the axis of the basin margin extended parallel to the faults; and the composited paleo-geomorphology system of valley depressions, slopes or ridges were formed substantially paralleled to the axis as the downthrown side. The subsidence center of the upthrow side extended axially; and the strata extended northeast. The high-gradient fan or fluvial sediments were deposited near the faults of the basin margin, and they were mainly transported laterally. Away from the provenance area, the influence of transverse fluvial or alluvial fan sediment from the short axis provenance was weakened in the downthrown side of the main faults. The rivers changed their course along the low end of the axial tilt direction (representing the maximum slope direction), and converged to form the sedimentary system of axial transport extending to the strike of the main fault boundary.

Key words: Raoyang sag, Neogene, distribution of reservoirs, sedimentary environments, fluvial

CLC Number:

P588.2

Zhang Liqiang, Lu Xuning, Ge Xueying, Zhang Shuguang. Neogene Sedimentary Models of Raoyang Sag in Liubei Area[J].Journal of Jilin University(Earth Science Edition), 2015, 45(4): 1021-1029.

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Neogene Sedimentary Models of Raoyang Sag in Liubei Area

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