鄂尔多斯盆地富县探区三叠系延长组震积岩及其地质意义

doi:10.7605/gdlxb.2015.04.044

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Abstract

Combined with regional tectonic setting,this study identifies typical seismites of the Upper Triassic Yanchang Formation in Fuxian exploration area of Ordos Basin through observation of cores from 26 drillholes. In the study area,representative sedimentary structures include liquefied sand-veins,liquefied curled deformation structures,loop beddings,load structures,ball-and-pillows,pillows,micro-faults,micro-fissures,and shatter breccias. Among these,liquefied sand-veins and liquefied curled deformation structures are the major earthquake-induced soft sediment deformation structures. The vertical successions of seismites are classified into two types:One is dominated by brittle deformations underlying and overlying unshocked layers,and consists of disturbed bedding layer,layer of step micro-fault,micro-fissure and seismic breccias,liquefied curled deformation layer,layer of shatter breccias,and liquefied sand-veins layer,respectively,from bottom to top;the other is dominated by soft-sediment deformations,which also underlies and overlies unshocked layers,and is divided into loop bedding layer,disturbed bedding layer,layer of ball-and-pillow and load structure,liquefied sand-veins and liquefied curled deformation layer,and pillow layer,respectively,from bottom to top. The seismites in the Yanchang Formation of Fuxian exploration area prove that there existed a competent structure and active periods of palaeotectonic movement;the presence of micro-faults,micro-fissures,shatter breccias and liquefied sand-veins is conductive to the improvement of reservoir physical property;furthermore,the seismic breccias and reticulate sand-veins are both good reservoirs.

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	Articles by authors
	Tian Yuan
	Zhong Jianhua
	Wang Shubao
	Tao Hongsheng
	Liu Shaoguang
	Li Yong
	Sun Ningliang
	Shao Zhufu
	Ni Liangtian
	Mao Cui
	Ge Yuzhu
	Chen Bin
	Qu Junli
	Wang Guilin

Key words： soft-sediment deformation seismite Triassic Yanchang Formation vertical succession sedimentation model Ordos Basin

Received: 18 March 2015 Published: 01 August 2015

ZTFLH:

P512.2

Corresponding Authors: Zhong Jianhua,born in 1957,is a professor of China University of Petroleum(East China). He is mainly engaged in sedimentology and rock mechanics researches. E-mail: 957576033@qq.com.

About author: Tian Yuan,born in 1990,is a master degree candidate of China University of Petroleum(East China). She is mainly engaged in sedimentology and sequence stratigraphy. E-mail: tianyuan93@163.com.

Cite this article:

Tian Yuan,Zhong Jianhua,Wang Shubao et al. Seismites and their geological significances of the Triassic Yanchang Formation in Fuxian exploration area, Ordos Basin[J]. JOPC, 2015, 17(4): 541-552.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2015.04.044 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2015/V17/I4/541

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