河套盆地临河坳陷白垩纪—古近纪沉积环境演化及油气地质意义<sup>*</sup>

doi:10.7605/gdlxb.2022.02.022

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Abstract

The study on the sedimentary evolution of the Hetao Basin is relatively insufficient,especially for the Cretaceous and Paleogene strata in the Linhe depression,which has important oil and gas exploration potential. In this article,based on sedimentology,mineralogy,petrology,geochemistry,field and drilling data,we performed a systematic sedimentary research on the Cretaceous to Paleogene strata in the Linhe depression and to explore its petroleum significance. The results show that: (1)From the Cretaceous to Paleogene,the Linhe depression in the Hetao Basin was characterized by sub-tropical arid and semi-arid climate,an overall oxygen-rich water body but locally anaerobic-anaerobic,and alternation of fresh water and brackish water environments. (2)There are five types of sedimentary facies in the Cretaceous to Paleogene strata,including alluvial fan,braided river,braided river delta,fan delta,and lacustrine facies,which are further divided into 12 types of sedimentary subfacies and 22 types of sedimentary microfacies. In the northwestern depression,the alluvial fan-delta-lacustrine sedimentary system was developed due to strong fault activity and high topographic relief. In the southeastern depression,a relatively weak tectonic activity and low topographic relief resulted in a braided river-braided river delta-lacustrine sedimentary system. The sedimentary pattern of each period is similar and only shows the variation of the fan-lacustrine boundary. (3)The Cretaceous to Paleogene Linhe Formation was characterized by arid and semi-arid,shallow water,dual provenances controlled by weak episodic tectonic activity. In the early stage of basin development,the tectonic activity was strong,but the basin was small and shallow. The clastic materials from both sides of basin margin rapidly advanced into and even converged in the center of the basin,forming a basin filled up by sands. With the weakening of tectonic activity and the rapid rise of lake water in the late stage,the clastic materials supply was insufficient to fill the lacustrine basin,thus forming a lake facies. (4)Sedimentary facies distribution in the depression control the macro-scale size,superimposed relationship and vertical evolution of sand bodies,and further determine the spatial distribution of effective reservoirs. Under the dual controlling factors of sedimentary facies and faulting,the favorable reservoirs in the Cretaceous to Paleogene strata are mainly distributed in the central faulted belt,which is dominated by shore-shallow lake and delta front deposits.

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	Lu Lu
	Chen Shu-Guang
	Li Zhuang-Fu
	Qin Yong
	Qu Zheng-Hui
	Shen Yu-Lin

Key words： sedimentary facies reservoir Cretaceous-Paleogene Linhe depression Hetao Basin

Received: 02 December 2021

ZTFLH:

P531

Fund:

Scientific and Technological Research Project of CNPC(No.2019D-0815), the 13th Young Teachers “Sailing Plan” of China University of Mining and Technology and the High Level Personal Project of Jiangsu Province(No. JSSCBS20211215)

Corresponding Authors: Li Zhuang-Fu,born in 1965,Ph.D.,is an associate professor at School of Resources and Geosciences,China University of Mining and Technology. He is mainly engaged in petroleum geology. E-mail: lizhuangfu@163.com.

About author: Lu Lu,born in 1989,Ph.D.,is a lecturer at School of Resources and Geosciences,China University of Mining and Technology. He is mainly engaged in lithotectonics and sedimentary basin evolution. E-mail: geollulu@cumt.edu.cn.

Cite this article:

Lu Lu,Chen Shu-Guang,Li Zhuang-Fu et al. Sedimentary evolution and petroleum potential of the Cretaceous to Paleogene in Linhe depression,Hetao Basin[J]. JOPC, 2022, 24(2): 308-331.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2022.02.022 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2022/V24/I2/308

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