渤海莱州湾凹陷南部古近系混合沉积特征及发育模式<sup>*</sup>

doi:10.7605/gdlxb.2018.06.076

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Abstract

Mixed clastic-carbonate deposits were widely distributed in the Lower part of Paleogene E₂s₃ Formation,Laizhou Bay sag,Bohai Sea. This paper studied the characteristics,facies and development model of the mixed deposits in this area based on sidewall coring,well logging data and laboratory sample analysis.Results show that the characteristics of deposits were mixing deposited between terrigenous fragments and carbonate constituent in one layer, and interbedded strata between terrigenous fragment and carbonate in the study area. Mixed rocks developed in lacustrine shore zone with input from two large provenances,and can be further classified into the following types: Mud flat subfacies of mixed deposits,sandy beach-bar subfacies of mixed deposits,shoal subfacies of mixed deposits, and semi-deep lake subfacies of mixed deposits. The mixed deposits were both controlled by wave actions and lake currents. According to the seismic,drilling,logging and paleontology data,it showed a regressive sequence feature for the lower part of the E₂s₃ Formation which contains lacustrine transgressive system tract(mainly includes mud flat subfacies of mixed deposits and sandstone bank subfacies of mixed deposits)and high-stand system tract(mainly includes bar subfacies of mixed deposits). The mixed deposits were controlled by palaeogeomorphology,palaeoclimate,palaeosource and lake level changes. The study showed that sandy beach-bar subfacies of mixed deposits and shoal subfacies of mixed deposits are dominant facies belts providing implications for researches on high-quality development reserves and direction of further exploration.

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	Articles by authors
	Liu Wen-Chao
	Zhang Guo-Kun
	Yang Hong-Fei
	Liu Jia-Qi
	Lv Shi-Cong

Key words： Laizhou Bay sag Shahejie Formation mixed deposits development model

Received: 27 April 2018

ZTFLH:

P512.2

Fund:

Financially supported by the National Science and Technology Major Project(No.2011ZX05023-006-002)

About author: Liu Wen-Chao,born in 1987,is a geological engineer in Bohai Oilfield Research Institute,Tianjin Branch of CNOOC Ltd. He is mainly engaged in research of petroleum geology. E-mail: liuwch8@cnooc.com.cn.

Cite this article:

Liu Wen-Chao,Zhang Guo-Kun,Yang Hong-Fei et al. Characteristics and development model of mixed deposits of the Paleogene in southern Laizhou Bay sag,Bohai Sea[J]. JOPC, 2018, 20(6): 1033-1042.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.06.076 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I6/1033

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