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| 基金项目：国家科技重大专项“中国近海富烃凹陷优选与有利勘探方向预测”（2016ZX05024-002） |
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| 摘要： |
| 东海陆架盆地西湖凹陷发育巨厚花港组，分为上下2段。花港组上段（简称“花上段”）河控三角洲-滨浅湖沉积体系已明确，花港组下段（简称“花下段”）沉积体系类型、平面展布规律及核心特征仍存在争议。为厘清该问题，以西湖凹陷花下段为研究对象，通过对10口重点井的岩芯进行精细描述，并结合钻井、测井及三维地震数据综合进行分析。结果表明：花下段沉积期，西湖凹陷发生了自南向北的海侵，同期发育河控三角洲、受潮汐影响的三角洲及潮坪3类沉积；在平面上，凹陷北部为河控三角洲，南部近源带为受潮汐影响的三角洲，南部远源带为潮坪。研究查明了花下段发育的3种沉积体系的特征，以及对应岩性组合与地震反射特征，可为区域沉积演化研究提供地质依据。 |
| 关键词：沉积体系 花港组下段 海侵 三角洲 潮坪 西湖凹陷 |
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| Abstract: |
| The Xihu Sag in the East China Sea Shelf Basin develops a thick succession of the Huagang Formation, which is divided into upper and lower members. While the depositional system of the river-dominated delta-shallow lacustrine facies in the Upper Member of the Huagang Formation (hereinafter referred to as the ″Upper Member″) has been well defined, the types, planar distribution patterns, and key characteristics of the depositional systems in the Lower Member of the Huagang Formation (hereinafter referred to as the ″Lower Member″) remain controversial. To address this issue, this study focuses on the Lower Member of the Xihu Sag. Based on detailed core descriptions from ten key wells, integrated analysis was conducted incorporating drilling, logging, and 3D seismic data. The results indicate that during the depositional period of the Lower Member, a transgression from south to north occurred in the Xihu Sag, with the contemporaneous development of three types of sedimentary facies: river-dominated deltas, tide-influenced deltas, and tidal flats. In terms of planar distribution, river-dominated deltas developed in the northern part of the sag, tide-influenced deltas formed in the proximal area of the southern part, and tidal flats were present in the distal area of the southern part. This research clarifies the characteristics of the three depositional systems developed in the Lower Member, along with their corresponding lithological assemblages and seismic reflection characteristics, providing a geological basis for regional sedimentary evolution studies. |
| Keywords:depositional system Lower Member of the Huagang Formation transgression delta tidal flat Xihu Sag |
| 王 欣,郭 刚,李林致,等.西湖凹陷花港组下段河控三角洲与受潮汐影响的三角洲沉积差异性及平面展布规律[J].地质学刊,2025,49(4):375-384 |
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