Progress on the Features of Laminated Physical Property and Hydrocarbon Accumulation of Lacustrine Fine-grained Sedimentary Rock
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摘要: 【意义】通过发表文献统计和前人研究成果分析，表明纹层状细粒沉积岩的储集物性和油气富集明显优于不发育/弱发育纹层状细粒沉积岩且与其具有极好的正相关性。相比于海相细粒沉积岩纹层结构，纹层状湖盆细粒沉积岩受限于沉积环境距物源区较近、沉积环境水动力变换频繁、受气候和构造活动等控制更加明显，导致不同种类纹层所表现的储集物性和油气富集特征不尽相同，相关差异性的总结至今仍不清晰且有待揭示。【方法】经聚焦近十年内的国内外相关文献，综述纹层状细粒沉积岩的孔隙、裂缝类型与成因，以及分别按纹层成分、连续性、序列组合阐述对其储集物性和油气富集特征的控制作用。【结果】认为纹层结构具有垂向上物质成分的频繁更替、内部微裂缝异常发育以及纹层结构下的有机质演化差异的优势特征，使其在细粒沉积岩的基础上进一步提升了油气富集的能力。【展望】并指出至今仍缺乏均为纹层发育的细粒沉积岩因彼此层内的孔隙、裂缝等因素不同所体现的储集物性的差异对比，以及利用计算机依据纹层微观数据反演宏观储层沉积模式以指导非常规储层开发将是未来阶段的发展方向Abstract: [Objective] Statistics of published literature and analysis of previous research results show that the reservoir physical properties and oil and gas enrichment of laminar fine-grained sedimentary rocks are obviously superior to those of undeveloped/weakly developed laminar fine-grained sedimentary rocks and have a very good positive correlation with them. Compared with the laminar structure of Marine fine-grained sedimentary rocks, the laminar lacustrine fine-grained sedimentary rocks are limited by the sedimentary environment being closer to the provenance area, the frequent change of sedimentary environment hydrodynamics, and the more obvious control by climate and tectonic activities. As a result, the reservoir physical properties and oil and gas enrichment characteristics of different types of laminar rocks are not the same. The summary of relevant differences is still unclear and needs to be revealed.[Method] By focusing on the relevant literature at home and abroad in the past ten years, the types and causes of pores and fractures of lamellar fine-grained sedimentary rocks are reviewed, and the controlling effects of lamellar composition, continuity and sequence combination on reservoir physical properties and hydrocarbon enrichment characteristics are described respectively. [Results] It is believed that the laminar structure has the advantages of frequent turnover of vertical material composition, abnormal development of internal micro-fractures and different evolution of organic matter under the laminar structure, which further improves the ability of oil and gas enrichment on the basis of fine-grained sedimentary rocks. . [Prospects] It is pointed out that there is still a lack of difference and comparison of reservoir physical properties of fine grained sedimentary rocks which are all laminated due to different factors such as pores and fractures in each other's layers, and it will be the development direction in the future to use computer to invert macro reservoir sedimentary model based on micro laminar data to guide unconventional reservoir development
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Key words:
- varve /
- fine-grained deposition rock /
- physical property /
- hydrocarbon enrichment /
- shale reservoir
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