海洋地质前沿2026，Vol.42Issue(5)：47-64,18.DOI:10.16028/j.1009-2722.2025.186
多物源输入背景下页岩岩相发育类型及页岩油潜力
Shale lithofacies and shale oil potential under multi-provenance input in the third member of Shahejie Formation in Gubei Sag,Bohai Bay Basin
摘要
Abstract
The shales developed in continental rifted lacustrine basins in the eastern part of China have shown promising potential of shale oil exploration.However,influenced by multi-provenance inputs,these shales exhibit complex lithofacies and significant heterogeneity in shale oil accumulation.Therefore,we investigated the 3rd lower sub-member of Shahejie Formation in the Gubei Sag,Bohai Bay Basin,to unravel the developmental pat-terns of shale lithofacies under multi-provenance condition,elucidate differential shale oil enrichment in different lithofacies,and thereby evaluate the resource potential.Key findings reveal that in the ternary discrimination of carbonate,felsic,and clayey terminals for shale lithofacies,the clay-rich hybrid lithofacies exhibits optimal oil content due to high organic matter abundance,dominance of Type I kerogen,well-developed micropore-fracture network formed by oriented arrangement of illite/smectite mixed layers,and high hydrocarbon retention effi-ciency.The carbonate-rich and felsic-rich hybrid lithofacies display moderate oil content.In contrast,the felsic-carbonate lithofacies,despite possessing the highest brittleness index,shows the lowest organic matter abundance and oil content.Reservoir spaces in different lithofacies are dominated by micron-scale dissolution pores,inter-crystalline pores,and clay interlayer fractures.Importantly,the predominant orientation of high-conductivity frac-tures aligns with the present maximum horizontal principal stress,which significantly enhanced the potential for generating complex fracture networks during hydraulic fracturing.Comprehensive analysis of crude oil properties(light-medium oil)and over-pressured zone distribution identified that the eastern subsag and northern central up-lift in the study area are the"sweet spots"of shale oil accumulation.This study provided a guidance to the ex-ploration deployment in the Gubei Sag with theoretical insights for shale oil exploration in similar continental rift lacustrine basins with strong multi-provenance inputs.关键词
渤海湾盆地/孤北洼陷/沙河街组/多物源输入/页岩岩相/页岩油潜力Key words
Bohai Bay Basin/Gubei Sag/Shahejie Formation/multi-provenance inputs/shale lithofacies/shale oil potential分类
海洋科学引用本文复制引用
谢传金..多物源输入背景下页岩岩相发育类型及页岩油潜力[J].海洋地质前沿,2026,42(5):47-64,18.基金项目
中国石油化工集团公司项目(P22083) （P22083）
中国石化胜利油田分公司项目(YKK2315) （YKK2315）
