苏北盆地高邮凹陷古近系阜宁组断层形成过程及其砂箱物理模拟

doi:10.11743/ogg20210216

Abstract

Abstract:

The study of fault development characteristics of the Funing Formation in Gaoyou Sag is of great significance to the understanding of the sag evolution and oil-gas enrichment.There are a large number of domino-type faults dipping NW in the east of the sag, and Ⅴ-shaped faults dipping NW and SE in the west of the sag.The difference in fault development characteristics indicates different fault formation processes, and the fault formation mechanisms in different zones are yet to clarified.Through three-dimensional seismic interpretation, unconformity and residual stratum identification, combined with displacement-depth curve and structural evolution analyses, it is proven that the boundary faults in the Funing Formation of Gaoyou Sag are non-syndepositional, thus having no obvious control on the formation of secondary faults in the sag.All faults of different assemblages in the east and west of the sag are formed under uniform stress field striking NW-SE, with main activities occurring at the end of the Funing Formation deposition.Two sets of physical simulation experiments were therefore designed according to the analytic conclusion of faults and the principle of similarity.The experimental results show that the Ⅴ-shaped fault assemblage in the west is formed under bilateral extension, while the domino fault assemblage in the east is controlled by unilateral extension and has no link to the eastern slope.The results of the two sets of experiments can reasonably explain the causes of the differential fault assemblage patterns.Geographically, before the deposition of Dainan Formation, Gaoyou Sag was in the same sag with Linze Sag in the north of the basin that is characterized by a narrow west and wide east.During the extensional deformation period, the stress propagation velocity on both sides of the basin to the center was different, leading to the differential overlapping zones with faults striking to various directions in different areas.

Key words: fault assemblage pattern, fault activity, formation process, analogue modeling, Funing Formation, Paleogene, Gaoyou Sag, Subei Basin

CLC Number:

TE121.1

Xu Tang, Yonghe Sun, Huiting Hu, Wenquan Yu, Haiqing Tang. Fault development and its analogue modeling in the Paleogene Funing Formation in Gaoyou Sag, Subei Basin[J]. Oil & Gas Geology, 2021, 42(2): 469-480.

Figures/Tables 12

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物理参数	实际值	模型值	相似系数
重力加速度(g)/(m·s^-2)	9.8	9.8	1
变形长度(l)/m	6 500	0.15	0.4×10^-5
伸展率/%	25	25	1
岩石密度(ρ)/(g·cm^-3)	3.00	2.65	0.89
粘度(η)/(Pa·s)	10¹⁷~10²¹	10²~10³	10^-15~10^-18
内摩擦角(ϕ)/(°)	31	31	1

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Fault development and its analogue modeling in the Paleogene Funing Formation in Gaoyou Sag, Subei Basin

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