陆相纹层型页岩油源储耦合与甜点形成机理——以准噶尔盆地风城组为例

doi:10.7657/XJPG20250603

摘要/Abstract

摘要：

中国陆相页岩油已获重大突破，但陆相页岩普遍非均质性强，源储耦合关系复杂，页岩油甜点形成机理仍不够明确。以准噶尔盆地风城组为例，综合运用大视域薄片扫描、场发射扫描电镜-能谱分析、激光共聚焦观测、有机地球化学分析等技术，重点从页岩纹层特征及其对页岩油甜点的控制开展研究。结果表明，以风城组为代表的陆相页岩纹层发育，可划分为粉砂级长英质纹层、泥级长英质纹层、粉晶白云质纹层、粉晶方解石纹层、球粒状硅质纹层和碱类矿物纹层6种类型，主要有粉砂级+泥级长英质纹层和粉晶方解石/白云质纹层+泥级长英质纹层2类纹层组合页岩。不同纹层源储特征差异显著，泥级长英质纹层和球粒状硅质纹层有机质含量高，发育层状结构藻、红藻果孢子等优质生烃母质，是主要的生油层；粉砂级长英质纹层发育石英/长石晶间孔、长石粒内溶蚀孔等微纳米孔隙，游离油占比高，为优势储集层。多种类型纹层叠置，通过控制页岩有机-无机相互作用、储集空间特征和烃类微运移过程，最终导致不同层段页岩油差异富集，其中，粉砂级+泥级长英质纹层为最佳源储配置，整体含油性好且分布广泛，构成泥生砂储的富集模式，是勘探开发的有利目标。

关键词: 准噶尔盆地, 陆相页岩油, 风城组, 纹层结构, 源储耦合, 甜点形成机理

Abstract:

Significant breakthroughs have been made in the exploration of continental shale oil in China. However, the strong heterogeneity and complex source-reservoir coupling in these shales have hindered the understanding of sweet spot formation mechanism. In this paper, taking the Permian Fengcheng formation in the Junggar Basin as an example, the characteristics of shale laminae and their controls on shale oil sweet spots were systematically investigated using multiple techniques such as large-area thin-section scanning, scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), confocal laser scanning microscopy (CLSM), and organic geochemical analysis. The results indicate that the lacustrine shales of the Fengcheng formation are well-laminated. The laminae can be classified into six types: silt-grade felsic lamina (SFL), argillaceous-grade felsic lamina (AFL), sparry dolomitic lamina (SDL), sparry calcite lamina (SCL), spherulitic siliceous lamina (SSL), and alkaline mineral lamina (AML). Two predominant laminated shale combinations are identified, i.e., SFL + AFL, and SCL/SDL + AFL. These lamina types exhibit significant variations in source-reservoir characteristics. AFL and SSL, characterized by high organic matter (OM) contents and the presence of high-quality hydrocarbon precursors such as laminated algae and rhodophyta spores, serve as the primary hydrocarbon-generating laminae. In contrast, SFL exhibits well-developed micropores and nanopores, including quartz/feldspar intercrystallline pores and feldspar intragranular dissolved pores, with a high proportion of free oil, rendering it favorable reservoir lamina. The superimposition of multiple lamina types governs organic-inorganic interactions, reservoir space characteristics, and hydrocarbon micro-migration processes, ultimately leading to differential enrichment of shale oil across various intervals. It is noted that the SFL + AFL combination represents the optimal source-reservoir configuration, demonstrating excellent overall oil content and forming an enrichment model characterized by oil generation in argillaceous lamina and accumulation in silty lamina. This combination is identified as a favorable target for shale oil exploration and development.

Key words: Junggar Basin, continental shale oil, Fengcheng formation, lamina structure, source-reservoir coupling, sweet spot formation mechanism

中图分类号:

P618.13

曹剑, 秦志军, 魏超, 向宝力, 刘金. 陆相纹层型页岩油源储耦合与甜点形成机理——以准噶尔盆地风城组为例[J]. 新疆石油地质, 2025, 46(6): 668-683.

CAO Jian, QIN Zhijun, WEI Chao, XIANG Baoli, LIU Jin. Source-Reservoir Coupling and Sweet Spot Formation Mechanism of Continental Laminated Shale Oil: A Case Study of the Fengcheng Formation, Junggar Basin[J]. Xinjiang Petroleum Geology, 2025, 46(6): 668-683.

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纹层类型	井名	深度/ m	有机地球化学特征					储集特征		含油性
纹层类型	井名	深度/ m	总有机碳含量/%	S₁/ （mg·g^-1）	S₂/ （mg·g^-1）	热解峰温/ °C	氢指数/ （mg·g^-1）	主要储集空间	平均孔隙直径/ nm	含油饱和度指数/ （mg·g^-1）	CLSM 轻/重比
粉砂级长英质纹层	夏203井	4 678.7	0.90	1.86	1.36	436	151.1	长石粒内溶蚀孔、粒间孔	665.3	206.7	1.32
粉砂级长英质纹层	夏203井	4 741.5	0.96	2.16	3.35	427	349.0	长石粒内溶蚀孔、粒间孔	890.1	225.0	1.31
泥级长英质纹层	夏203井	4 678.7	3.06	10.02	12.98	434	424.2	石英/长石晶间孔、粒内孔、顺层缝	351.4	327.5	0.88
	夏203井	4 741.5	1.82	5.04	5.21	429	286.3		596.8	276.9	0.96
	夏203井	4 711.9	2.78	5.68	11.08	433	398.6		501.2	204.3	1.14
粉晶方解石纹层	夏203井	4 711.9	1.06	2.25	2.28	432	215.1	石英晶间孔、粒间孔	549.7	212.3	1.01
粉晶白云质纹层	夏207井	4 938.5	1.16	2.53	2.68	439	231.0	石英/长石晶间孔、白云石粒内溶蚀孔	431.6	218.1	1.13
球粒状硅质纹层	夏203井	4 678.7	1.45	4.09	4.36	440	300.7	石英晶间孔	329.2	282.1	1.15
碱类矿物纹层	夏207井	4 942.2	0.97	1.25	2.58	437	266.0	硅硼钠石晶间孔		128.9	0.93
碱类矿物纹层	夏207井	4 950.3	1.05	2.20	3.18	432	302.9	硅硼钠石晶间孔	447.1	209.5	0.99

沉积环境	地区和层位	纹层及岩相特征		烃源条件		储集物性	含油饱和度指数/ (mg·g^-1)	源储关系	甜点优选
沉积环境	地区和层位	主要纹层组合	典型岩相	总有机碳含量/%	镜质体反射率/ %	孔隙度/ %	含油饱和度指数/ (mg·g^-1)	源储关系	甜点优选
淡水	松辽盆地青山口组	富黏土质+长英质纹层	纹层状长英质页岩、黏土质页岩	0.9~3.8	0.5~1.2	4.0~8.0	42.0~400.0	源储一体	纹层状长英质页岩
淡水	鄂尔多斯盆地延长组7段	富有机质+粉砂级长英质/凝灰质纹层	块状粉—细砂岩、纹层状长英质页岩	5.0~38.0	0.7~1.3	5.0~12.0	27.0~380.0	源储分离、源储一体	粉—细砂岩、纹层状长英质页岩
半咸水—咸水	渤海湾盆地沙河街组	富黏土质+粉晶方解石纹层	纹层状石灰质页岩、泥质石灰岩	1.0~4.0	0.5~1.2	3.0~16.0	50.0~300.0	源储共生	纹层状石灰质页岩
	渤海湾盆地孔店组二段	富黏土质+长英质/白云质纹层	纹层状白云质页岩、纹层状长英质页岩	2.0~6.0	0.5~1.1	3.1~5.7	23.6~753.6	源储共生	纹层状长英质/白云质页岩
	准噶尔盆地芦草沟组	富凝灰质+长英质纹层/灰云质纹层	块状白云质粉砂岩、石灰质/白云质页岩	2.0~14.0	0.6~1.1	4.0~12.0	20.1~570.0	源储分离	块状白云质粉砂岩
碱湖	准噶尔盆地风城组	泥级长英质+粉砂级长英质/灰云质纹层	纹层状长英质页岩、纹层状灰云质页岩(含碱)	0.1~3.3	0.5~1.6	0.2~10.6	15.1~627.0	源储共生	纹层状长英质页岩