鄂尔多斯盆地南部三叠系延长组沟谷体系构造成因

doi:10.11743/ogg20210504

Abstract

Abstract:

The valley systems widely developed at the top of Yanchang Formation in the Zhenjing area, southern Ordos Basin, is previously considered to be a product of long denudation and river erosion.However, deeper investigation indicates otherwise.In order to gain clearer insights into the connection between the development characteristics and occurrence of the systems with regional tectonics, this study characterizes the systems and discusses their tectonic genesis through analyses of fault interpretation and pre-Jurassic paleogeomorphy restoration based on 3D seismic data.It shows that the main fault (Yudu) experiences a sinistral strike-slip due to a NE-SW oblique compression during the late deposition stage of the Yanchang Formation, causing some layers of the formation that are still in the process of diagnesis to be plastically deformed to form a series of NW-SW trending compressional uplifts and valleys.An almost synchronously occurring NW-SE extension eventually results in the formation of this broadly distributed valley systems.The understanding can be used to guide the exploration of reservoirs in both the Yanchang Formation and overlying Yan'an Formation in the area.

Key words: sinistral strike-slip, plastic deformation, valley system, tectonic genesis, Yanchang Formation, Ordos Basin

CLC Number:

TE121.2

Faqi He, Rong Qi, Fubin Wang, Jie Deng, Li Cheng, Tianle Hu. Tectonic genesis of Triassic Yanchang Formation valley systems, southern Ordos Basin[J]. Oil & Gas Geology, 2021, 42(5): 1056-1062.

Figures/Tables 6

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Tectonic genesis of Triassic Yanchang Formation valley systems, southern Ordos Basin

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