Palaeoearthquake deformation structures of the Chang 6 interval of Upper Triassic Yanchang Formation and superimposed relationship between sandbodies in Huachi-Qingyang area of Ordos Basin
Tian Jingchun, Wang Wenzhi, Wang Feng, Wang Weihong, Zhang Jinquan
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology，Chengdu 610059，Sichuan
Abstract：The Chang 6 interval of the Upper Triassic Yangchang Formation in the Ordos Basin is one of the most important interval of the Mesozoic section.The Chang 6 interval are characterized by the development of reservoir sandbodies and multiple genetic types.During the sedimentary evolution of the Chang 6 interval of Yanchang Formation in Huachi-Qingyang area of the Ordos Basin，liquefaction deformation structures related with palaeoearthquake are developed extensively.The authors，based on many previous research results，by detailed description and observation of drilling cores of Chang 6 interval in the research area，studied the characteristics of liquefaction deformation structures systematicly.The structures mainly include: Load and sand ball structure，vibrational liquefaction curl deformation structure，sand invasion mushroom，liquefaction dike，such as liquefied swing structure.The difference of deformation structures formed by seismic events and gravity slumping are distinguished，mainly as: The advantage deformation direction of deformation structures，the existence of the sliding surface and the existence of uniform layer. Based on the above analyses，the vertical relationship between the delta front sandbody formed by normal deposition or slump turbidite sandbody and seismite sandbody are also studied which include two types: The overlay between seismic events sandbody and the normal deposition sandbody(delta front sandbody); the seismic events sandbody and slump turbidite sandbody formed from delta front.At the end，the origin models are established.
. Palaeoearthquake deformation structures of the Chang 6 interval of Upper Triassic Yanchang Formation and superimposed relationship between sandbodies in Huachi-Qingyang area of Ordos Basin[J]. JOPC, 2012, 14(3): 303-310.
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