鄂尔多斯盆地镇原北部三叠系延长组长7—长6油层组古地貌与砂体分布特征

doi:10.7605/gdlxb.2015.06.066

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Abstract

Triassic Yanchang Formation is one of the main targets of oil and gas exploration in northern Zhenyuan area. The types and distribution of sandbody are controlled by the palaeogeomorphology. Based on cores,well log analyses,and sandy debris flow viewpoints proposed by Shanmugam,the gravity flow deposits can be divided into turbidites,sandy debris flow sediments and slump rocks. After building the high-resolution sequence stratigraphy framework,an optimized backstripping method is used to restore the deposited terrain,and the palaeogeomorphology map of the studied area is drawn by short-term base level unit. The study finds that the north of Zhenyuan situated near the depositional slope break zone,Chang 7₃ was of the maximum transgression,the degree of the slope is 0.45,turbidites and sandy debris flow sediments developed in the deep lake in the northeastern part of the study area. From Chang 7₃ to Chang 7₂ depositional periods,the base level decended,the mouth bar and the slope break zone gradually advanced to the lake,and the angle of the slope break zone began to decrease;from Chang 7₂ to Chang 7₁ depositional periods,the base level began to rise,the slope break and the sandbody gradually retreated to the shore. From Chang 6₃ to Chang 6₁ depositional periods,the base level decended,sediments deposited in the basin,the slope decreased to 0.1°,sandy debris flow sediments and slump rocks developed under the slope break.

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	Articles by authors
	Cui Longtao
	Hao Shuai
	Wang Chunping
	Zhu Wentao

Key words： Ordos Basin Triassic Yanchang Formation palaeogeomorphology slope break zone sandy debris flow sandbody distribution

Received: 08 August 2013 Published: 01 December 2015

ZTFLH:

P512.2

About author: Cui Longtao,born in 1988,obtained his master degree from China University of Geosciences(Beijing)in 2014. He is mainly engaged in researches on sedimentology and sequence stratigraphy. E-mail: longtaocui@gmail.com

Cite this article:

Cui Longtao,Hao Shuai,Wang Chunping et al. Palaeogeomorphology reconstruction and sandbody distribution of the Chang 7-6 intervals of Triassic Yanchang Formation in northern Zhenyuan area,Ordos Basin[J]. JOPC, 2015, 17(6): 805-812.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2015.06.066 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2015/V17/I6/805

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