南堡凹陷1号构造带帚状构造特征及其地质意义

doi:10.13810/j.cnki.issn.1000-7210.2023.04.022

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Abstract The main and secondary associated fault configuration of brush structures controlling the Nanpu No. 1 structure belt is different from the common brush structure fault configuration. For this reason, the evolution process of brush structures is complicated due to the reactivity of pre-existing basement faults and the interaction between late and new faults under the background of multi-stage superimposed deformation in Nanpu Sag, and it is difficult to understand the genesis of brush structures and their control law on oil and gas. Therefore, based on three-dimensional(3D) contiguous seismic data, structural analysis theory and related techniques are applied to systematically study the structural pattern of the No. 1 structural belt in Nanpu Sag and restore its evolution process, and the genesis of brush structures and its internal relationship with oil and gas accumulation are highlighted, so as to provide a theoretical basis for oil and gas exploration in the brush structure of Bohai Bay Basin. The results show that:①The brush structure of the No. 1 structural belt in Nanpu Sag is controlled by main faults F₁ and F_N and secondary faults. F₁ started to be active in the Mesozoic and then reactivated in the Cenozoic. It propagated and grew from south to north. The southern boundary fault F_N started to be active in the Ed₃ deposition period, and the secondary fault held by F₁ and F_N started to be active in the Nm deposition period. ②The brush structure has experienced three stages of evolution:Paleogene rifting Ⅰ and Ⅱ, as well as post-Neogene rifting. The segmented growth of main faults in the Paleogene Es deposition period provides the background for the formation of the brush structure, and the stress field in the Paleogene Ed deposition period provides the stress mechanism for the development of the brush structure;the oblique extension of F₁ and the orthogonal extension of F_N in the Ng-Nm deposition period of the Neogene control the secondary faults, and the brush structure is established. ③ On the one hand, the development of brush structures in the Nanpu No. 1 structural belt indicates the stress regime transition in the Cenozoic. On the other hand, the main and secondary faults controlling brush structures as oil source faults control not only the vertical migration of oil and gas but also the formation of synchronous and reverse fault traps, indicating the location of oil and gas enrichment.

Key words： Nanpu Sag brush structure main fault stress regime oil source fault vertical migration trap

Received: 05 August 2022

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P631

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	Articles by authors
	SUN Yonghe
	LIU Lu
	MENG Lingjian
	MA Yan

Cite this article:

SUN Yonghe,LIU Lu,MENG Lingjian等. Characteristics of brush structures in No. 1 structural belt and their geological significance in Nanpu Sag[J]. OGP, 2023, 58(4): 983-992.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2023.04.022 OR http://www.ogp-cn.com/EN/Y2023/V58/I4/983

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