| 王伟,李海彬,俞凌杰,倪冬梅.松辽盆地南部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[J].地质找矿论丛,2025,40(3):310-318 |
| 松辽盆地南部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 the 1st Member of the Yingcheng Formation, Lishu Fault Depression, Songliao Basin |
| 投稿时间：2025-04-12 修订日期：2025-08-11 |
| DOI：10.6053/j.issn.1001-1412.2025.03.004 |
| 中文关键词: 梨树断陷 营城组一段 陆相页岩气 成藏主控因素 储层特征 |
| 英文关键词:Lishu fault depression 1st member of Yingcheng Formation continental shale gas main controlling factors of reservoir formation reservoir characteristics |
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| 中文摘要: |
| 利用松辽盆地白垩系下统营城组一段第一口陆相页岩气井180 m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为厚度大、含气量高、物性好的高粘土含量页岩，厚度92 m，含气量2.63 m3/t，孔隙度平均为5.01 %，渗透率平均为0.077 mD，粘土矿物含量为45.1 %，碳酸盐岩矿物含量为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为发育，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。研究结果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，揭示了松辽盆地白垩系下统营城组一段陆相页岩气良好的勘探前景，为松辽盆地陆相页岩气资源勘探开发提供了依据。 |
| 英文摘要: |
| A study on "sedimentary lithology geochemical indicators reservoir parameters" is conducted using laboratory analysis sample data from a 180 m 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 the 1st member of the Yingcheng Formation are systematically analyzed, and a continental layered shale gas enrichment model is 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 92 m, high gas content, and good physical properties. It has a gas content of 2.63 m3/t, an average porosity of 5.01 %, an average permeability of 0.077 mD, 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 essential facies in the first section of the Yingcheng Formation. Both organic and inorganic pores are well-developed in these facies, with mesopores and micropores being the primary types of pores, and bedding fractures being the predominant types of fractures. The layers control the development of pores, 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 layered rich-organic 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 specific 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 enormous terrestrial shale gas resources in the Songliao Basin and China. |
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