东秦岭-大别造山带北缘逆冲推覆构造特征及油气前景

doi:10.11743/ogg20060109

Abstract

Abstract:

Overthrust structure on the northern edge of East Qinling-Dabie orogenic belt consists of the southern and the northern overthrust faults, which constitutes the structural link between the East Qinling-Dabie orogenic belt and the southern North China basin. The overthrust structure is characterized by segmentation along the strike and zonation in the dip direction, i. e. it can be divided into frontal zone, overthrust sheet zone and root zone in the dip direction, and into Yuxi, southern edge of Zhoukou and Huainan-Hefei 3 overthrust segments along the strike. The tectonic evolution can be divided into 3 stages, namely Indosinian collision orogenic stage, late Yanshanian intracontinental orogenic stage and the end of Yanshanian-early Himalayan strike slip extension stage. The preservation condition of source rocks varies greatly in different zones and segments and oil and gas shows are concentrated around the frontal zone. Therefore, the frontal thrust fault zone and the foredeep zone (basin/depression) can be evaluated as the most favorable areas for exploration, while the overthrust sheet zone (basin/depression) that lies between the southern and northern thrust fault zones would be relatively favorable for exploration.

Key words: overthrust, tectonic evolution, petroleum exploration, East Qinling-Dabie orogenic belt, southern North China basin

CLC Number:

TE111.2

Xie Dongning, He Mingxi, Zhou Lifa, Xie Qifeng. Characteristics of overthrust structures on northern edge of East Qinling-Dabie orogenic belt and hydrocarbon potentials[J]. Oil & Gas Geology, 2006, 27(1): 48-55.

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Characteristics of overthrust structures on northern edge of East Qinling-Dabie orogenic belt and hydrocarbon potentials

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