Current structure of Yingen-Ejinaqi Basin and enlightenments for petroleum exploration

doi:10.3969/j.issn.1672-7703.2023.01.008

Abstract

Abstract: Yingen-Ejinaqi Basin is one of the large basins with low degree of exploration in China. The multiple processing and interpretation results of deep seismic data led to unclear understanding of the current basin structure and restricted the understanding on the direction of petroleum exploration in the basin. The analysis of the drilled wells, reprocessing and interpretation of seismic data, and study on basin tectonic deformation enable to clarify the stratigraphic age, determine the current structural features of deep formations and basin type, and propose the direction of petroleum exploration in the basin. The results show that: (1) There is a distinct unconformity between the Mesozoic and Pre-Mesozoic in Yingen-Ejinaqi Basin, which is characterized by continuous seismic event with strong energy; (2) The previously regarded Carboniferous-Permian system below the unconformity with horizontal continuous seismic reflection is actually multi wave imaging since that the Carboniferous-Permian system could not be horizontally distributed below the Mesozoic; (3) It is a Mesozoic rift basin above the unconformity surface, and each layer of the Cretaceous shows clear reflection features in the main basin part; (4) The Pre-Mesozoic (mainly Carboniferous-Permian system) below the unconformity is characterized by a series of thrust structures and complex folds, discontinuous seismic imaging, and low signal-to-noise ratio. On the whole, Yingen-Ejinaqi Basin was a Mesozoic rift basin developed on the fold basement of Hercynian orogenic belt, and strong fold deformation and thrust tectonism occurred before the Mesozoic. The oil and gas discoveries are mainly obtained in the Cretaceous, which is the main formation for the petroleum exploration. The analysis method combining geology and seismic is helpful to correctly understand the complex basin or complex areas in the basin.

CLC Number:

TE111.1

Cui Haifeng, Hou Yan, Lu Rukui. Current structure of Yingen-Ejinaqi Basin and enlightenments for petroleum exploration[J]. China Petroleum Exploration, 2023, 28(1): 83-93.

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