东部陆相混积页岩储层差异对比及页岩油富集模式
杜心宇 , 钱门辉 , 沈臻欢 , 冷筠滢 , 李楚雄 , 黎茂稳 , 李志明 , 马晓潇 , 曹婷婷 , 黄振凯 , 贾梦瑶 , 孙中良
地球科学 ›› 2026, Vol. 51 ›› Issue (5) : 1698 -1720.
东部陆相混积页岩储层差异对比及页岩油富集模式
Comparative Analysis of Eastern Continental Mixed Sedimentary Shale Reservoirs and Shale Oil Enrichment Patterns
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渤南洼陷沙三下亚段与苏北盆地阜二段页岩储层是我国东部典型混积页岩型储层,虽均具有多源供烃、源‒储共存、烃类向优势层微运移的共性特征,但在埋藏方式、热演化程度、岩相发育、储集性等方面存在显著差异,制约了混积页岩型储层页岩油富集模式的深化研究.本文以上述两套典型陆相混积页岩储层为研究对象,在系统梳理前人研究方法与认识的基础上,综合运用多种实验技术方法开展储层差异对比研究,解析页岩油富集机制,厘清页岩油富集模式.结果表明,埋藏方式通过控制矿物组成与沉积构造类型影响储层基础特征,Ro不仅决定含油性及赋存特征,还通过热演化持续改造储集空间类型.储集空间差异控制烃类微运移方向,而周缘纹层的含油性及烃类占比则影响微运移的启动与强度.进一步揭示两研究区优势岩相的页岩油富集模式:渤南洼陷沙三下亚段以“泥生灰储”和“泥生砂储”为主,苏北盆地阜二段以“泥生云储”和“泥生砂储”为主.适宜的成熟度、充足的有机质供给、较高的大孔占比及良好的孔缝系统是页岩油富集的核心控制因素.满足上述条件的纹层组合内部存在烃类调配效应——轻质游离烃可微运移至邻近具备富集条件的纹层,并在纹层内横向运移至大孔中赋存.本文构建的页岩油富集模式为混积页岩储层的类比评价提供了可行框架,深化了源‒储耦合控制下页岩油富集高产机理的认识.
The Lower Es3 sub-member (Bonan subsag) and Fu2 member (Subei basin) represent typical mixed sedimentary shale reservoirs in eastern China. They share common characteristics such as multi-source hydrocarbon supply, source-reservoir coexistence, and micro-migration of hydrocarbons to dominant layers. However, they also exhibit significant differences in burial mode, thermal evolution degree, lithofacies development, and reservoir properties, which have restricted the in-depth study of shale oil enrichment patterns in continental mixed sedimentary shale reservoirs.This study selected the two sets of typical continental mixed shale reservoirs as research objects. Based on a systematic review of previous research methods and findings, a variety of experimental techniques were comprehensively employed to conduct comparative studies on reservoir differences and analyze enrichment mechanisms, thereby clarifying the shale oil enrichment patterns.The results show follows. ①Burial mode affects the basic reservoir characteristics by controlling mineral composition and sedimentary structure types. ②Vitrinite reflectance (Ro) not only determines oil-bearing property and occurrence characteristics, but also continuously modifies reservoir space types through thermal evolution. ③ Differences in reservoir space control the direction of hydrocarbon micro-migration, while the oil-bearing property and hydrocarbon proportion of surrounding laminae affect the initiation and intensity of micro-migration. Furthermore, the shale oil enrichment patterns of dominant lithofacies in the two study areas are revealed: the Lower Es3 sub-member (Bonan subsag) is dominated by “mud-generating and limestone-storing” and “mud-generating and sand-storing” modes, while Fu2 member (Subei basin) is characterized by “mud-generating and dolomite-storing” and “mud-generating and sand-storing” modes.Appropriate maturity, sufficient organic matter supply, high macropore proportion, and a well-developed pore-fracture system are the core controlling factors for shale oil enrichment. A hydrocarbon allocation effect exists within lamina assemblages that meet the above conditions-light free hydrocarbons can micro-migrate to adjacent laminae with enrichment potential and then migrate laterally into macropores for accumulation. The shale oil enrichment pattern constructed in this study provides a feasible framework for the analogy evaluation of mixed sedimentary shale reservoirs and deepens the understanding of the enrichment and high-yield mechanism of shale oil under source-reservoir coupling control.
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国家自然科学基金企业创新发展联合基金项目(U24B6002)
中国石化科技部基础研究项目(P24207)
中国石化石油勘探开发研究院科技项目(YK⁃2025⁃08)
中国石化科技部基础前瞻项目(P24206⁃3)
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