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| 松辽盆地梨树断陷营城组一段页岩气储层形成机制及成藏主控因素 |
| Formation mechanism and main controlling factors of shale gas reservoir in 1st member of Yingcheng Formation, Lishu Fault Depression, Songliao Basin |
| 投稿时间：2025-04-11 修订日期：2025-08-11 |
| DOI： |
| 中文关键词: 松辽盆地 梨树断陷 营城组一段 陆相页岩气 成藏主控因素 |
| 英文关键词:Songliao Basin Lishu fault depression 1st member of Yingcheng Formation Continental shale Gas Main controlling factors of reservoir formation |
| 基金项目:中国石化科技部资助项目（松南地区陆相页岩油气勘探潜力及目标评价，编号：P22386）,其他项目 |
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| 中文摘要: |
| 利用松辽盆地下白垩统营城组一段第一口陆相页岩气井180m岩心与249块全岩分析、地球化学分析、氩离子抛光扫描电镜、孔喉微观结构分析、全孔径测定、核磁共振等实验室分析样品资料，开展了“沉积岩相-地化指标-储层参数”的研究，系统分析了营城组一段Ⅰ亚段页岩气发育特征及关键参数，建立了陆相纹层状泥页岩页岩气富集模式。研究认为松辽盆地梨树断陷营城组一段含钙泥页岩属于厚度大、含气量高、物性好的高粘土含量页岩，厚度92m，含气量2.63m3/t，孔隙度平均5.01%，渗透率平均0.077mD,粘土矿物含量45.1%，碳酸盐岩矿物含量17.5%。富有机质纹层状钙质泥页岩相为营城组一段最主要岩相，该岩相有机质孔与无机孔均较发育，孔隙以介孔和微孔为主，裂缝以层理缝为主，纹层控制了孔隙的发育，纹层的发育程度越高，孔隙度越大，同时纹层的发育密度与含气量具有正相关关系。认为厚层暗色富有机质泥页岩是营城组一段湖相页岩气富集的基础；富有机质纹层状钙质泥页岩相为营城组一段湖相页岩气提供了有利赋存空间。基于以上认识针对富有机质纹层状泥页岩开展了水平井钻探，针对高粘土含量页岩采用“脆塑”双甜点组合改造工艺，取得了一定的测试效果，揭示了松辽盆地下白垩统营城组一段陆相页岩气良好勘探前景，为释放松辽盆地及国内巨大的陆相页岩气资源做出了有效的尝试。 |
| 英文摘要: |
| A study on "sedimentary lithology geochemical indicators reservoir parameters" was conducted using laboratory analysis sample data from a 180m core of the first continental shale gas well in the Lower Cretaceous Yingcheng Formation 1st member of the Songliao Basin, as well as 249 whole rock analyses, geochemical analyses, argon ion polishing scanning electron microscopy, pore throat microstructure analyses, full aperture measurements, and nuclear magnetic resonance. The development characteristics and key parameters of shale gas in 1st member of Yingcheng Formation were systematically analyzed, and a continental layered shale gas enrichment model was established. Research suggests that the calcium bearing shale in the Yingcheng Formation of the Lishu Fault Depression in the Songliao Basin belongs to a high clay content shale with a thickness of 92m, high gas content, and good physical properties. It has a gas content of 2.63m3/t， an average porosity of 5.01%, an average permeability of 0.077mD, a clay mineral content of 45.1%, and a carbonate mineral content of 17.5%. The organic rich layered calcareous mudstone facies is the most important facies in the first section of the Yingcheng Formation. Both organic and inorganic pores are well-developed in this facies, with mesopores and micropores as the main types of pores, and bedding fractures as the main types of fractures. The development of pores is controlled by the layers, and the higher the degree of layer development, the greater the porosity. At the same time, the development density of layers is positively correlated with gas content. It is believed that thick dark organic rich shale is the basis for the enrichment of lacustrine shale gas in the first section of the Yingcheng Formation; The rich organic layered calcareous shale facies provide favorable storage space for lacustrine shale gas in the first section of the Yingcheng Formation. Based on the above understanding, horizontal well drilling has been carried out for organic rich layered shale. And the "brittle plastic" double sweet spot combination transformation process was adopted for high clay content shale, achieving certain testing results and revealing the good exploration prospects of terrestrial shale gas in the Lower Cretaceous Yingyi Formation of the Songliao Basin, and making effective attempts to release the huge terrestrial shale gas resources in the Songliao Basin and China. |
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