塔里木盆地雅克拉断凸走滑作用及其形成机理

doi:10.11743/ogg20130218

Abstract

Abstract:

The Yakela faulted salient is a key area in the Tarim Basin where some economically important oil and gas have been discovered.The 3D seismic interpretations,in combination with the regional geological data,demonstrate that strike-slip movement occurred in the area.On plane view,many small faults are developed near the major faults,including concordant shear faults and extensional faults.These faults consist of echelon fault systems with a low-angle with the major movement direction and a limited length.The fault system along the Yanan fault is characterized by a left-step pattern,whereas a right-step pattern is shown along the Luntai fault.On sectional view,they consist of a negative flower-like structure with obvious dolphin and ribbon effects.The strike-slip movement initiated in the late Yanshanian,culminated in the early Himalayan,and terminated in the late Himalayan.The left-lateral transtensional stress from the joint action of the left-lateral shear stress and the tensile stress resulted in the strike-slip movement of the Yakelafult-salient and the deve-lopment of the associated extensional structures during the Middle-Late Yanshanian to the Early Himalayan.

Key words: strike-slip, left-lateral transtensional stress, echelon normal fault, Yakela faulted salient, Tarim Basin

CLC Number:

TE121.1

Luo Xiaolong, Tang Liangjie, Xie Daqing, Qiu Haijun, Jiang Huashan, Yang Yong, Chen Xuyun, Zhang Yuhang. Strike-slip movement and its genetic mechanism in Yakela faulted salient, the Tarim Basin[J]. Oil & Gas Geology, 2013, 34(2): 257-263.

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Strike-slip movement and its genetic mechanism in Yakela faulted salient, the Tarim Basin

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