苏北盆地古近系阜三段沉积体系特征与模式

doi:10.19657/j.geoscience.1000-8527.2020.084

摘要/Abstract

摘要：

综合岩性组成、沉积构造、粒度特征、单砂体厚度、测井响应特征和地震反射特征的分析,重新论证了苏北盆地阜三段的沉积体系类型,认为该区发育建设型三角洲体系、浪控三角洲—滩坝体系、风暴沉积体系和近岸水下扇体系。阜三段沉积时期盛行南风。金湖西部凹陷和盐城凹陷位于背风侧,波浪作用较弱,以河流进积作用为主,发育大型建设型三角洲体系。建湖隆起南侧(高邮北部凹陷、金湖东部凹陷、海安凹陷)和滨海隆起前(阜宁凹陷、涟北凹陷)位于迎风缓坡带,波浪作用强烈,湖浪和沿岸流对三角洲前缘砂体进行搬运和再分配,发育浪控三角洲—滩坝体系。金湖凹陷、高邮凹陷和海安凹陷的半深湖区,风暴浪将滨浅湖沉积物携带至半深湖环境,发育风暴沉积体系。苏南隆起前的高邮南部凹陷位于断陷陡坡带,具有地形高差大、近物源、水体深的古地理特征,有利于近岸水下扇体系的发育。

关键词: 苏北盆地, 阜三段, 沉积体系, 滩坝, 沉积模式

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

中图分类号:

TE121.3

王旭影, 姜在兴. 苏北盆地古近系阜三段沉积体系特征与模式[J]. 现代地质, 2020, 34(06): 1132-1143.

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.

图/表 11

图1 苏北盆地构造位置及构造单元

Fig.1 Tectonic location and units of the Subei Basin

图2 苏北盆地阜三段建设型三角洲前缘的典型沉积特征(盐参1井)

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

图3 苏北盆地阜三段正常风浪坝的典型沉积特征

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

图4 苏北盆地阜三段风暴坝的典型沉积特征

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

图5 苏北盆地阜三段浪控三角洲—滩坝沉积模式

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

图6 苏北盆地阜三段风暴沉积的典型沉积特征(金1井)

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

图7 苏北盆地阜三段近岸水下扇测井响应特征

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

图8 苏南隆起前高邮南部凹陷砂砾岩含量分布(%)

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

图9 苏南隆起前高邮南部凹陷许字号井区近岸水下扇地震反射特征 T31为阜三段的顶;T33为阜二段的底;地震剖面位置见图8 A.充填反射;B.丘状反射;C.丘状反射;D.楔状反射

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

图10 苏北盆地阜三段沉积体系平面分布

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

图11 苏北盆地阜三段沉积模式

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

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