Tectonic Evolution of the Yan ③ Fault Zone and Its Trap-controlling Effect on Yancheng Sag, Subei Basin

doi:10.19657/j.geoscience.1000-8527.2023.081

Abstract

Abstract:

The Yan ③ fault zone is located in the Yancheng Sag of Subei Basin, and it underwent multiple per-iods of extension-strike-slip tectonic activities in the fault zone or its surrounding areas, controlling the temporal and spatial validity of the traps. In order to elucidate the influence of these tectonic traps on the differential accumulation of oil and gas, it is necessary to clarify the evolution of the Yan ③ fault zones in different periods and understand the controls of the tectonic deformation on the traps. In this study, we used the high-precision 3D seismic data of Yancheng Sag to analyze the geometric morphology and kinematic characteristics of the main faults and surrounding secondary faults. Meanwhile, we use the back-stripping technique to quantitatively restore the growth of fault segmentation. A paleotectonic map was used to analyze the deformation laws of the tectonic belts at each stage, and analyze the tectonic evolution at each stage and their controls. The results show that the Yan ③ fault zone has undergone three major stages of evolutions. (1) During the sedimentation period of Taizhou-Funing Formation (K₂t-E₁f₄), the NW extension controlled the isolated growth of the western Yan ③ normal faults, and the two faults in the eastern section connected softly. At this stage, the fault has no clear controls on the depression, and the trap development is very weak. (2) At the end of Funing Period (E₁f₄) with the short-term compression-torsion occurring rapidly, it resulted in the reactivity of the Yan ③ faults and forming a series of NW trending conjugate shear faults, and a series of traps formed along the salt fault zone. (3) During the Danan-Yancheng period (E₂d-Ny), the SN extension was strong to the east and weak to the west, controlling the reactivity of the Yan ③ fault zone in the east, and meanwhile the tectonic activity adjusted the trap. In general, the overall tectonic activity intensity differs from the ‘high intensity in the early period and weak in the late period, and high intensity in the east and low intensity in the west’. Meanwhile, with the tectonic stress field constantly changing, the tectonic amplitude and area of the traps have been gradually decreased, and the structure has been gradually shifted to the SW direction.

Key words: Yancheng Sag, Yan ③ fault zone, restoration of paleo-structure, trap-controlling effect, tectonicevolution

CLC Number:

P542
TE121.1

XIE Zhaohan, FENG Chang, QIU Yongfeng, LI Heyong, ZHANG Jianbo, TANG Haiqing. Tectonic Evolution of the Yan ③ Fault Zone and Its Trap-controlling Effect on Yancheng Sag, Subei Basin[J]. Geoscience, 2024, 38(02): 300-311.

Figures/Tables 10

Fig.1 Structural map and stratigraphic table of Subei Basin

Fig.2 3D visualization of the fault zone network in the Yan ③ fault zone

Fig.3 Seismic interpretation profile in the Yan ③ fault zone

Fig.4 Depth-throw curve and fault growth index of the Yan ③ fault

Fig.5 Depth-throw curves and back stripping result of the Yan ③ fault

Fig.6 Tectonic evolution profile of the Yan ③ fault in Yancheng Sag (see Fig.1 for profile location)

Fig.7 Maps of paleostructure and tectonic units in different stratigraphy and periods

Fig.8 Paleostructural maps of top interface of the first member of Funing Formation in different periods

Fig.9 Trap evolution process of top interface of the first member of Funing Formation

Table 1 Statistical table of the trap parameter changes in different periods

活动时期	圈闭总面积 (km²)	圈闭最大幅度(m)	圈闭总体积(km³)	圈闭个数
阜宁组沉积后	7.59	50	176.21	9
戴南组沉积后	6.28	50	127.32	10
三垛组一段沉积后	5.09	45	118.89	10
三垛组沉积后	3.68	40	55.24	10
现今	3.37	35	34.82	6

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