海洋地质前沿2026，Vol.42Issue(2)：52-65,14.DOI:10.16028/j.1009-2722.2025.134
西湖凹陷平北斜坡带河潮联控沉积特征及有利储层识别
Sedimentary characteristics of river-tide joint control in the Pingbei Slope Belt of Xihu Sag and favorable reservoir identification
摘要
Abstract
The Pinghu Formation in the Pingbei Slope Belt of the Xihu Sag is located in a river tidal controlled sedimentary environment,with the development of fluvial-deltaic,tidal-deltaic,and tidal flat sand bodies.Due to the complex faults,fast sedimentary phase changes,and difficulty in identifying different types of channel sand bodies in this area,it is extremely difficult to predict favorable reservoirs.Using seismic,core,and logging data,combined with single well facies,continuous well facies,and seismic facies analysis techniques,six types of fault slope breaks and three sand control modes were summarized,and a comparative analysis of sedimentary charac-teristics of the river tidal control system was completed;Using AVO forward simulation technology to determine gradient attributes can effectively identify waterway sand bodies.The results indicate that the study area can be di-vided into reverse fault step zones,forward fault step zones,and composite fault step zones;Under the overall wa-ter recession background of the Eocene epoch,the supply of sediment sources in the northwest was strengthened,and the sedimentary environment gradually shifted from being dominated by tides to being dominated by rivers;The AVO gradient attribute can transform dark spot reflections in the middle and deep layers into bright spot re-flections,increasing the amplitude energy by 6-10 times,effectively identifying channel sand bodies in the middle and deep river tidal control sedimentary system.关键词
平北斜坡带/河潮联控/沉积特征/储层识别Key words
Pingbei Slope Belt/river tide joint control/sedimentary characteristics/reservoir identification分类
海洋科学引用本文复制引用
王红岩,赵洪,刘亚茹,黎建,赵天亮,佘晓慧..西湖凹陷平北斜坡带河潮联控沉积特征及有利储层识别[J].海洋地质前沿,2026,42(2):52-65,14.基金项目
中海石油(中国)有限公司重大科技专项项目(KJZX-2023-0101) （中国）
