川西南地区荥经坳陷早中奥陶世地震事件记录及意义<sup>*</sup>

doi:10.7605/gdlxb.2018.05.057

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Abstract

The drilling of shale gas wells(CYY1,YD1 and YD2)was carried out in Yingjing depression. On the basis of core observations and sedimentary structures,a large number of soft-sediment deformation structures(SSDS)and brittle deformation structures were identified within the Middle-Lower Ordovician sandstone and shales,including load structures(e.g., ball-pillow structures,flame structures,load casts,etc.),liquefaction structures(e.g., sand dykes,liquefied breccia),boudinage,convolute lamination,shatter fissures,shatter breccia and syn-sedimentary faults,etc. These contemporaneous and penecontemporaneous deformation structures suggest that they were most likely triggered by earthquakes. Our results suggest that at least two strong seismic events happened,while the last one led to a tsunami,which was accompanied by several aftershocks. The tectonic movement occurred during Early-Middle Ordovician led to faulting,and can be related to an early episode of Douyun movement during Caledonian,which,in turn,was significant for Chuanzhong uplift. The earthquake greatly improved the quality of oil and gas reservoirs.

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	Xiong Xiao-Hui
	Wang Jian
	Wang Zheng-Jiang
	Xiong Guo-Qing
	Deng Qi
	Yang Ping

Key words： seismite soft-sediment deformation structures(SSDS) the Early-Middle Ordovician Caledonian Movement Douyun Movement Yingjing depression Sichuan Basin

Received: 06 December 2017

ZTFLH:

P588.2

Fund:

Young Scientists Foundation of National Natural Science Foundation of China(No,41402103)and National Natural Science Foundation of China(No.41030315)

Corresponding Authors: Wang Jian,born in 1962,is a researcher and doctoral supervisor. Now he is mainly engaged in researches on sedimentary resource and tectonics. E-mail: w1962jian@163.com.

About author: Xiong Xiao-Hui,born in 1987,doctor,is an engineer of Chengdu Center,China Geological Survey. Now he is mainly engaged in sedimentology and oil and gas(shale gas)research. E-mail: xiongxiaohui1987@163.com.

Cite this article:

Xiong Xiao-Hui,Wang Jian,Wang Zheng-Jiang et al. Earthquake event records in Yingjing depression of southwestern Sichuan during the Early-Middle Ordovician[J]. JOPC, 2018, 20(5): 815-824.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.05.057 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I5/815

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