西湖凹陷西斜坡 K 地区古近系始新统宝石组 -平湖组层序格架及沉积模式

Sequence framework and sedimentary model of the Paleogene Eocene Baoshi and Pinghu Formation in the K Area of western slope in Xihu Sag

摘要

古近系始新统宝石组、平湖组是东海陆架盆地主力产层。利用岩心、钻井、三维地震等资料，以西湖凹陷西斜坡带 K 地区为例，结合同期全球海平面变化，重新划分古近系始新统宝石组、平湖组层序，分析内部沉积特征，探讨层序发育的控制因素。结果表明：西湖凹陷 K 地区宝石组、平湖组划分为 2 个二级层序，宝石组为 1 个二级层序，内部可划分为 4 个三级层序；平湖组为 1 个二级层序，内部可划分为 5 个三级层序，每个三级层序内部发育海侵体系域与高位体系域。 K 地区宝石组、平湖组沉积模式可划分 3 种，低位期，前一个高位体系域暴露剥蚀夷平，发育层序界面；海侵期，全区被海水淹没，内部发育退积型前三角洲；高位期，海平面开始下降，受潮汐作用影响，内部发育进积型潮控三角洲，潮汐作用强烈地区还发育潮坪沉积。 K 地区宝石组、平湖组三级层序及其内部沉积特征发育的主要控制因素是构造运动、海平面升降、物源供给及古气候。该结果为西湖凹陷的油气勘探提供地质依据。

Abstract

In view of the fact that the Paleogene Eocene Baoshi Formation and Pinghu Formation are the main producing layers in the East China Sea Shelf Basin, and the Paleogene Eocene Baoshi and Pinghu Formation are the main producing layers in this area. Based on core, drilling, three-dimensional seismic and other data, taking the K Area of the western slope zone of Xihu Sag as an example, combined with the global sea level change during the same period, we redivided the Paleogene Eocene Baoshi and Pinghu Formation sequences, analyzed their internal sedimentary characteristics, and discussed the controlling factors of sequence development. The results show that: the Baoshi and Pinghu Formation in the K Area of the Xihu Sag are divided into two second-order sequences. The Baoshi Formation is one second-

order sequence, and four third-order sequences can be divided into four third-order sequences. The Pinghu Formation is one second-order sequence, which can be divided into five third-order sequences. Each third-level sequence develops a transgression system domain and a high-level system domain. The sedimentary patterns of the Baoshi and Pinghu Formation in the K Area can be summarized into three types: during the low period, the previous high system domain was exposed and eroded, and the sequence interface was developed; during the transgression period, the whole area was submerged by seawater, and a receding pre-delta developed in its interior; during the high period, the sea level began to decline, and under the influence of tidal action, a sedimentary tidal delta developed inside, and tidal flat sedimentation also developed in areas with strong tidal action. The main controlling factors for the development of the tertiary sequences and internal sedimentary characteristics of the Baoshi and Pinghu Formation in the K Area are tectonic movement, sea level rise and fall, source supply and paleoclimate. This study provides a geological basis for oil and gas exploration in the Xihu Sag.

关键词

西湖凹陷 / 宝石组 / 平湖组 / 层序格架 / 体系域 / 沉积模式 / 古近系 / 始新统

Key words

Xihu Sag / Baoshi Formation / Pinghu Formation / sequence framework / system domain / sedimentation mode / Paleogene / Eocene

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基金资助

中国石化上海海洋油气分公司科技攻关项目(3400000222 -ZC0613-0008)

广州海洋地质调查局地质调查项目(DD20230501)

广州海洋地质调查局地质调查项目(DD20230107)