深水水道内部砂岩发育特征定性评价——以西非陆缘深水水道为例  

Evaluation of internal sandstone development characteristics in deep-water channels:A case study of deep-water channels in West African margin

作　　者：阳怀忠 刘新颖 杜威 Yang Huaizhong;Liu Xinyin;Du Wei(CNOOC International Ltd.,Beijing 100028,China)

机构地区：[1]中国海洋石油国际有限公司,北京100028

出　　处：《资源环境与工程》2025年第2期139-144,共6页Resources Environment & Engineering

基　　金：中国海洋石油集团有限公司“十四五”重大科技项目“‘两岸一带’重点区油气勘探评价关键技术”(KJGG2021-0902)。

摘　　要：水道是深水扇沉积体系中重要的储层发育单元,其内部砂岩发育情况极其复杂。以水道沉积背景及其发育过程为基础,综合考虑其控制因素,选取能够定性反映水道内部砂岩发育情况的直观表现形式——平均弯曲度、侵蚀—充填特征、叠加样式、发育位置等,结合西非深水水道实际数据,讨论不同表现形式下水道内部砂岩发育特征。分析认为,平均弯曲度、侵蚀—充填特征、叠加样式和发育位置等在一定程度上可以反映水道内部砂岩发育程度,一般来说,平均弯曲度小、中等发育程度的侵蚀—充填特征、较为紧密的侧向叠加样式、相对靠近陆坡中部的水道(复合体)具有更好的砂岩发育条件。然而,考虑到水道内部沉积过程的复杂性,在实际研究中需结合沉积地形、物源供给等开展多因素综合评价,以提高水道内部砂岩分析预测的可靠性。As critical reservoir development units within deep-water fan depositional systems,submarine channels exhibit highly complex internal sandstone architectures.This study establishes a comprehensive evaluation framework integrating channel sedimentary context,evolutionary processes,and controlling parameters.The authors key morphological indicators including average sinuosity,erosional-filling characteristics,stacking pattern,and spatial position that qualitatively reflect sandstone development features.Through detailed analysis of West African deep-water channel systems using integrated datasets,this research systematically investigates sandstone distribution characteristics under different morphological conditions.The analysis shows that the average sinuosity,erosion-filling characteristics,stacking pattern and spatial position can reflect the development degree of sandstone in the channel to a certain extent.Generally speaking,the channel(complex)with small average sinuosity,medium development degree of erosion-filling characteristics,relatively close lateral stacking pattern,and relatively close to the middle of slope has better sandstone development conditions.However,considering the complexity of the sedimentary process inside the channel,it is necessary to carry out multi-factor comprehensive evaluation in combination with sedimentary topography and source supply in practical research to improve the reliability of sandstone analysis and prediction inside the channel.

关 键 词：西非陆缘 深水扇 水道 平均弯曲度 侵蚀—充填 叠加样式 

分 类 号：P618.13[天文地球—矿床学]