Sedimentary Filling Evolution and Tectonic Control of the Lower Cretaceous of the Wunan Depression in Hailaer Basin

Abstract

Abstract:

According to the recognition and division of the sequence boundaries, the Lower Cretaceous of Wunan depression can be divided into five two-order sequences and seven third-order sequences. Wunan depression is composed of western steep slope zone, eastern gentle slope zone, Wunan sag, Wuzhong uplift and Bayantala fault zone. Each sub-structural unit constrains the development and distribution of sedimentary systems. The tectonic subsidence analysis suggests that the evolution of the Wunan depression can be divided into five stages: early rifting stage, initial rifting stage, intense rifting stage, rifting-subsiding stage and subsiding stage. Alluvialvolcanic basin sequence, alluvialshallow lacustrine basin sequence, semi-deep lacustrine-deep lacustrine basin sequence, semi-deep lacustrine basin sequence and shallow lacustrine basin sequence are developed respectively. The evolution and sedimentary facies of each two-order sequence was controlled by the different stages. The slope region in the east and the Bayantala fault zone are the favorable reservoir belts.

Key words: sequence stratigraphy, sedimentary system, tectonic subsidence, Wunan depression

CLC Number:

TE121.3

CHU Cheng-Lin, LIN Chang-Song, ZHU De-Feng. Sedimentary Filling Evolution and Tectonic Control of the Lower Cretaceous of the Wunan Depression in Hailaer Basin[J]. Geoscience, 2010, 24(4): 669-677.

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