Sedimentary Characteristics and Mode of the Paleogene Funing Formation (3rd Member) in the Subei Basin

doi:10.19657/j.geoscience.1000-8527.2020.084

Abstract

Abstract:

By analyzing the lithological composition, sedimentary structure, grain-size characteristics, single sand body thickness, logging response, and seismic reflection, the sedimentary system types of the Funing Formation (3^rd Member) in the Subei Basin are re-examined. The study concludes that river-dominated delta, wave-dominated delta and beach-bar systems, as well as storm depositional and nearshore subaqueous fan systems are developed in the study area. South winds prevailed during the stage of Funing Formation (3^rd Member) in the Subei Basin. The Western Jinhu and Yancheng sags are located on the leeward side, and are dominated by large-scale river-dominated delta system, where the wave effect is weak and the river effect is strong. The southern side of Jianhu uplift (Northern Gaoyou, Eastern Jinhu, and Hai’an sags) and the southern side of Binhai uplift (Suining and Yubei sags) are located in the windward gentle slope belt, and are dominated by wave-dominated delta and beach-bar systems. In these areas, wave action is strong, and lake waves and coastal currents may have transported and redistributed the deltaic front sand bodies. In the semi-deep lake areas of the Jinhu, Gaoyou and Haian sags, storm surges may have carried sediments from the shallow lake to the semi-deep lake environment, and developed a storm deposition system. The Southern Gaoyou Sag is located in the steep slope zone belt, and exhibits paleogeographic features of large terrain difference, near source and deep water, which is conducive to nearshore subaqueous fan system development.

Key words: Subei Basin, Funing Formation (3^rd Member), sedimentary system, beach bar, depositional model

CLC Number:

TE121.3

WANG Xuying, JIANG Zaixing. Sedimentary Characteristics and Mode of the Paleogene Funing Formation (3^rd Member) in the Subei Basin[J]. Geoscience, 2020, 34(06): 1132-1143.

Figures/Tables 11

Fig.1 Tectonic location and units of the Subei Basin

Fig.2 Typical sedimentary features of the river-dominated deltaic front of the Funing Formation (3rd Member) in the Subei Basin (well Yancan 1)

Fig.3 Typical sedimentary characteristics of the normal wind-wave bar of the Funing Formation (3rd Member) in the Subei Basin

Fig.4 Typical sedimentary characteristics of the storm bar of the Funing Formation (3rd Member) in the Subei Basin

Fig.5 Depositional model of the wave-dominated delta and beach bar of the Funing Formation (3rd Member) in the Subei Basin

Fig.6 Typical sedimentary characteristics of the storm deposition of the Funing Formation (3rd Member) in the Subei Basin (well Jin 1)

Fig.7 Logging response characteristics of the nearshore subaqueous fan of the Funing Formation (3rd Member) in the Subei Basin

Fig.8 Glutenite content distribution (%) of the Southern Gaoyou Sag before the Sunan uplifting

Fig.9 Seismic reflection characteristics of the nearshore subaqueous fan in the well Xu area of the Southern Gaoyou Sag before the Sunan uplifting

Fig.10 Plane distribution of sedimentary systems of the 3rd Member of Funing Formation in Subei Basin

Fig.11 Depositional mode of the 3rd Member of Funing Formation in Subei Basin

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