| 缪云,万琼华,李庆明,文鑫,陈晨,公证.基于海相三角洲外前缘储层分类表征的剩余分布规律预测[J].矿产勘查,2026,17(6):963-974 |
| 基于海相三角洲外前缘储层分类表征的剩余分布规律预测 |
| Prediction of residual oil distribution patterns based on the classification and characterization of reservoirs in the outer front of marine deltas |
| 投稿时间：2025-04-15 |
| DOI：10.20008/j.kckc.202606003 |
| 中文关键词: 三角洲远端 剩余油 流动单元 渗流屏障 优势渗流通道 |
| 英文关键词: the distal of delta remaining oil flow unit seepage barrier preferential flow channel |
| 基金项目:本文受中海石油“十三五”重大科技项目(CNOOC-KJ135ZDXM22SZ)资助。 |
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| 中文摘要: |
| 海相三角洲远端因位置的特殊性，复杂的水动力造成储层内部多变。目前国内外学者致力于三角洲分流河道及砂坝的模式研究，相对远端的远砂坝、陆架砂脊和陆架砂席研究较少。南海东部地区尚未开展三角洲远端不同储层类型的剩余油分布规律研究，导致不能高效指导该类油田的挖潜。为此，笔者在总结惠州区域三角洲外前缘储层构型模式及其级次划分的基础上，以惠州 A油田两类储层为例，分类别完成储层表征并预测剩余油分布规律。(1)针对储层构型单元类型多样、接触关系复杂，剩余油主控因素为渗流屏障的储层，完成各类构型单元的识别及其接触关系、组合样式、构型边界的表征；(2)针对储层构型单元类型单一但内部非均值强，剩余油主控因素为优势渗流通道的储层，基于产能敏感参数，进行多参数流动单元的划分，表征优势渗流通道的分布规律。研究表明:远砂坝、陆架砂脊和陆架砂席一般相伴而生，彼此叠置，看似连片发育的砂体，内部渗流屏障发育；陆架砂脊内部虽然渗流屏障不发育，但是流动单元类型变化大，极易形成优势渗流通道，简单的开发井网往往动用程度低。本研究不仅可以完善三角洲远端储层构型地质理论，而且可以分类高效指导该类油藏剩余油挖潜。 |
| 英文摘要: |
| Due to their unique location, the distal parts of marine deltas are characterized by complex hydro-dynamics, leading to highly variable reservoir architectures. Currently, scholars both domestically and internation-ally are focusing on the study of deltaic distributary channels and sandbars, while relatively less attention has beenpaid to the distal sandbars, shelf sand ridges, and shelf sand sheets. In the eastern South China Sea, research on thedistribution patterns of residual oil in different reservoir types of deltaic distal parts has not yet been conducted, re-sulting in an inability to efficiently guide the potential exploitation of such oil fields. To address this issue, the au-thor, based on summarizing the reservoir architecture model and hierarchical division of the deltaic outer front inthe Huizhou area, takes two types of reservoirs in Huizhou A Oilfield as examples to complete reservoir characteriza-tion and predict the distribution patterns of residual oil: (1) For reservoirs with diverse architectural unit types, com-plex contact relationships, and where residual oil is primarily controlled by flow barriers, the identification of vari-ous architectural units and the characterization of their contact relationships, combination patterns, and architec-tural boundaries are completed; (2) For reservoirs with a single architectural unit type but strong internal heterogene-ity, where residual oil is primarily controlled by preferential flow pathways, multi-parameter flow units are dividedbased on production-sensitive parameters, and the distribution patterns of preferential flow pathways are character-ized. The study shows that distal sandbars, shelf sand ridges, and shelf sand sheets generally occur together, withoverlapping sand bodies that appear to be continuous, but with well-developed flow barriers inside. Although shelfsand ridges do not have well-developed flow barriers, they have significant variations in flow unit types, which eas-ily form preferential flow pathways, and simple development well patterns often have very low utilization rates. Thisresearch not only improves the geological theory of deltaic distal reservoir architecture but also provides an efficient,categorized guidance for the exploitation of residual oil in such reservoirs. |
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