南襄盆地南阳凹陷地质结构与形成演化

doi:10.11743/ogg20210215

Abstract

Abstract:

Nanyang Depression, a secondary structural unit to the Nanxiang Basin, is a petroliferous fault depression developed in the Qinling-Dabie fold orogenic belt.The study on its geological structure features is of great significance to the hydrocarbon exploration in the depression and the understanding of basional structural-sedimentary responses by the uplifting and denudation of Qinling-Dabie fold orogenic belt.Based on 2D and 3D seismic survey results as well as drilling and log data of the area, this study identified regional unconformities, divided structural-stratigraphic sequences, and characterized the main faults as well as the planar and sectional features of the depression.The evolution process of the depression was also rebuilt with balanced section restoration.The results show that the Nanyang Sag has four regional unconformities at the bottom of Hugang (T_g), Yuhuangding (T₇), Hetaoyuan (T₅) and Shangsi Formations (T₁), and five recognizable structural-stratigraphic sequences, namely the basement, Hugang Formation, Yuhuangding-Dacangfang Formations, Hetaoyuan-Liaozhuang Formations and Shangsi-Pingyuan Formations.Controlled by several basement faults, i.e.the Xinye Fault, Yutong Fault and Shigang Fault, the Sag is characterized by a tectonic pattern of NS zonation, EW partition and alternate uplift and sag.Five tectonic evolution stages are suggested to have successively shaped the Sag from the initial rift depression to continuous fault depression, strong fault depression, fault-depression transition and final depression.It is therefore concluded that the Nanyang Sag is structurally controlled by its complex basement structure, boundary fault variations and sectional subsidence differentiations.

Key words: unconformity, fault system, geologic architecture, tectonic evolution, differential subduction, Nanyang Sag

CLC Number:

TE122.2

Zhi Li, Zhiye Zhang, Yunfei Yang, Wenjian Guo, Yan Li, Teng Li, Jian Xiong. Geologic architecture and tectonic evolution of Nanyang Sag, Nanxiang Basin[J]. Oil & Gas Geology, 2021, 42(2): 456-468.

Figures/Tables 9

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Geologic architecture and tectonic evolution of Nanyang Sag, Nanxiang Basin

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