渤海湾盆地东营凹陷古近系细粒沉积岩特征及沉积环境<sup>*</sup>

doi:10.7605/gdlxb.2019.03.030

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Abstract With the development of shale oil and gas exploration,it is necessary to dissect the type and composition of fine-grained sedimentary rocks in detail,which is of great significance for the establishment of dominant rock assemblage in subsequent reservoir studies. Fine-grained sedimentary rocks are well developed in Dongying sag,Bohai Bay Basin. By means of core observation,X-ray diffraction of whole rock and analysis methods,the carbonate minerals,clay minerals and silty minerals are considered to be the main mineral components of fine-grained sedimentary rocks in Donying sag. According to mineral content and sedimentary structure,the fine-grained sedimentary rocks of the lower submember of Es3 member and the upper submember of Es4 member can be divided into 9 kinds of rock types,in which the laminar mixed fine-grained sedimentary rocks,the massive mixed fine-grained sedimentary rocks,the laminar limestone,the laminar silty limestone and the laminar argillaceous siltstone are relatively well developed. Based on the vertical variation of the characteristic element ratio of Ca/Mg,Na/Al,Fe/Mn,Sr/Ba,V/(V+Ni),and the element content of Ti and Al,it is deduced that there are some obvious evolution stages of fine-grained sedimentary rocks in palaeoclimate,palaeowater depth,palaeosalinity,oxidative or reductive properties of the water,and the content of terrigenous clastics input. The palaeoclimate changed from dry and cold to warm and humid in the depositional period of upper submember of Es4,and developed from warm and humid to relatively cold and humid to warm and humid to relatively hot and humid in the depositional period of the lower submember of Es3. In conclusion,warm and humid climate together with the increase of terrigenous clastics contributed to deposit large amounts of laminar mixed fine-grained sedimentary rocks,whereas the laminar silty limestone tended to deposit in relatively cold and dry climate as well as less terrigenous clastics input. This conclusion is conducive to deepen the basic research of fine-grained sedimentary rocks in the faulted lacustrine basin,and can lay a solid foundation for future exploration and development of oil and gas.

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	Articles by authors
	Liu Shu-Jun
	Cao Ying-Chang
	Liang Chao

Key words： fine-grained sedimentary rocks lithologic characteristics sedimentary evolution Shahejie Formation Dongying sag

Received: 07 March 2018

ZTFLH:	P588.21
	TE121.3+1

Fund:[Financially supported by the National Natural Science Foundation of China(Nos. U1762217,41602142,41821002)]

Corresponding Authors: Cao Ying-Chang,born in 1969,is a professor and Ph.D. supervisor. He is engaged in researches of sedimentology,sequence stratigraphy and reservoir geology. E-mail: caoych@upc.edu.cn.

About author: Liu Shu-Jun,born in 1993,is a master degree candidate. She is engaged in research of fine grain sedimentology. E-mail: 494275775@qq.com.

Cite this article:

Liu Shu-Jun,Cao Ying-Chang,Liang Chao. Lithologic characteristics and sedimentary environment of fine-grained sedimentary rocks of the Paleogene in Dongying sag,Bohai Bay Basin[J]. JOPC, 2019, 21(3): 479-489.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2019.03.030 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2019/V21/I3/479

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