石油与天然气地质2025，Vol.46Issue(2)：392-406,15.DOI:10.11743/ogg20250205
陆相富碳酸盐页岩纹层组合对页岩油富集的控制作用
Controlling effects of lamina assemblages on shale oil enrichment for lacustrine carbonate-rich shales:A case study of shales in the Paleogene Shahejie Formation,Jiyang Depression,Bohai Bay Basin
摘要
Abstract
Breakthroughs have been achieved in the exploration of lacustrine shale oil.However,the dominant geological factors controlling the enrichment and high yield of shale oil remain unclear,restricting its efficient exploitation.The fine characterization of various laminae can reveal the major factors controlling shale oil enrichment.This study focuses on the carbonate-rich shales of the Paleogene Shahejie Formation in the Jiyang Depression.Using thin section observations and field emission scanning electron microscopy(FE-SEM),we analyze the reservoir spaces and oil-bearing properties of typical laminae and reveal the controlling effects of the lamina assemblages of shales on oil enrichment.The results indicate that carbonate-rich shales in the upper sub-member of the 4th member of the Shahejie Formation(Es4U)within the Jiyang Depression contain five lamina types:fibrous calcite laminae,micritic calcite laminae,very fine crystalline calcite laminae,clay-mineral-rich laminae,and mixed laminae.Major lamina assemblages include the combination of micritic calcite laminae,clay-mineral-rich laminae,and mixed laminae,and the combination of fibrous calcite laminae,very fine crystalline calcite laminae,clay-mineral-rich laminae,and mixed laminae.The clay-mineral-rich and mixed laminae,among others,exhibit high organic matter content,serving as the material basis for shale oil enrichment.Meanwhile,the very fine crystalline calcite laminae,with well-developed reservoir spaces,act as preferential storage media for shale oil.Additionally,the superposition of clay-mineral-rich laminae with very fine crystalline or micritic calcite laminae forms the optimal lamina configuration for shale oil enrichment.Therefore,the carbonate-rich shales with the clay-mineral-rich laminae and very fine crystalline or micritic calcite laminae assemblage serve as an important target for shale oil exploration and exploitation.关键词
富碳酸盐页岩/纹层组合/富集因素/页岩油/沙河街组/济阳坳陷/渤海湾盆地Key words
carbonate-rich shale/lamina assemblage/enrichment factor/shale oil/Shahejie Formation/Jiyang Depression/Bohai Bay Basin分类
能源科技引用本文复制引用
李军亮,李俊乾,刘嘉祺,王民,秦峰,王勇,魏晓亮,孟伟,沈安超,宋兆京,余昌琦..陆相富碳酸盐页岩纹层组合对页岩油富集的控制作用[J].石油与天然气地质,2025,46(2):392-406,15.基金项目
国家自然科学基金项目(42473064,U24B6002) （42473064,U24B6002）
国家油气重大专项(2024ZD1405100). （2024ZD1405100）
