鄂尔多斯盆地乌审旗-靖边古隆起对奥陶系盐下沉积与储层的控制作用

doi:10.11743/ogg20210210

Abstract

Abstract:

A detailed study on stratigraphic correlation based on drilling data and of seismic sections, the Cambrian system thickness measurements, observation of superjacent pinch-out boundaries of intervals in the system and the pre-Ordovician paleo-geologic mapping of the Ordos Basin shows that, apart from the Yimeng and Lyuliang Uplifts as well as the Central Paleo-uplift, another uplift, the Wushen-Jingbian Paleo-uplift was also developed in the basin during the Early Paleozoic.Though completely absent from the core of the paleo-uplift, the Cambrian intervals are successively (from old to young) overlapping the uplift.Further paleo-structural analysis indicates that inherited from its Cambrian predecessor, Wushen-Jingbian was still a low-amplitude underwater uplift during the Ordovician sedimentary period and controlled the subsalt deposition and reservoir development in the central and eastern Ordos Basin.As a result, the uplift is of distinctively differentiated sedimentary facies in the east-west direction, and has played an indispensable role in joining the Central Paleo-uplift and Lyuliang Uplift to form the Mizhi Salt Depression in the east of the basin.Furthermore, with well-developed mound-shoal complexes that are typical of shallow-water deposition and prone to generate dissolved pore structures due to intermittent exposure during sea regression, the uplift is considered to be highly promising in terms of the Ordovician subsalt gas exploration.

Key words: grain shoal, microbial mound, paleo-uplift, Ordovician, Cambrian, Ordos Basin

CLC Number:

TE122.1

Liubin Wei, Hongde Chen, Wei Guo, Ting Yan, Zhenghong Cai, Lixia Zhou. Wushen-Jingbian Paleo-uplift and its control on the Ordovician subsalt deposition and reservoirs in Ordos Basin[J]. Oil & Gas Geology, 2021, 42(2): 391-400, 521.

Figures/Tables 12

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Wushen-Jingbian Paleo-uplift and its control on the Ordovician subsalt deposition and reservoirs in Ordos Basin

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