Structural Characters and Evolution of the MidSouth Section at the West Margin of Ordos Basin

Abstract

Abstract:

Main seismic sections in the west margin of the Ordos Basin are explained，depend on balanced section technology and 2D Move software. Nine firstlevel faults and four firstlevel structure units are confirmed，and the west margin of the Ordos Basin is divided into five sections.The structure distortion is stronger in the east than in the west. Majiatan section is thinskinned structure，but the others are thickskinned tectonics.The shortest compressed measure is different in different areas.Tianshuibu sections shortest compressed measure is up to 50.62%. Structure distortion came into being in Late Jurassic (146-135 Ma) mostly，ended in Cenozoic. Structure trap types are multiplex，which can supply a certain amount of space for the accumulation of oil and gas. Their forming matches with the period of accumulation of oil and gas. The structure character of the west margin of the Ordos Basin is different from east to west or from north to south. The relationship between the structure trap and accumulation of oil and gas is close.

Key words: the midsouth section at the west margin of the Ordos Basin, balanced section technology, structural character, geological structure, structural evolution

OU Yang-Zheng-Jian, CHEN Hong-De, FENG Juan-Ping. Structural Characters and Evolution of the MidSouth Section at the West Margin of Ordos Basin[J]. Geoscience, 2012, 26(4): 691-695.

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