Bedding structure types, combinations and reservoir significances of fine-grained rocks of the Permian Lucaogou Formation in Jimsar Sag, Junggar Basin
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摘要:
细粒沉积岩中的层理是影响页岩储层物性的关键因素。吉木萨尔凹陷二叠系芦草沟组发育丰富的层理构造。基于工区内钻井、岩芯、薄片及物性资料，开展了层理构造特征、成因及储集意义分析。本文将1 cm厚度作为界限，小于1 cm的沉积层称为纹层，大于1 cm沉积层称为层理。研究表明：纹层与层理在形成沉积水动力条件及厚度规模上存在差异，识别出两类层理组合，第一类为厚层的层理-纹层组合，主要见于粉细砂岩中，垂向上依次发育对偶粒序层理、块状层理、交错层理、爬升波纹层理及不规则纹层，反映异重流水道成因；第二类为薄纹层为主的组合，通常见于泥质粉砂岩，垂向上为对偶粒序层理与不规则纹层，反映出异重流朵叶体成因特征。第一类组合指示了强水动力条件，如异重流水道，其单层厚度及累计厚度大，储集性好；第二类组合指示较弱水动力条件，如异重流朵叶体，其单层厚度及累计厚度较小，储集性相对较差。该研究可以为细粒沉积学及页岩油勘探开发实践提供有价值的参考。
Abstract:Abstracts: The lamination and bedding structures in fine-grained rocks are key factors affecting the quality of shale oil reservoir. The Permian Lucaogou Formation in the Jimsar Sag, Junggar Basin, NW China was studied for this. Based on drilling wells, cores, thin sections, and physical property data of the area, the characteristics, genesis, and reservoir significance of bedding structures were analyzed. Thickness of 1cm was defined as the boundary: less than 1cm referred to a lamina, and greater than 1 cm referred to a bedding. Results show that, both laminae and beddings are in sedimentary origin, showing differences in hydrodynamic condition and thickness. Two types were identified. The first one is thick-bedded bedding-lamination type, often shown in fine-grained sandstone, with vertical development of upward-coarsening/finning bedding, massive bedding, cross bedding, climbing ripple bedding, and irregular lamination, indicating the strong hydrodynamic origin such as hyperpycnal channels. The second type is laminae-dominated one usually seen in muddy siltstone, consisting of vertical upward-coarsening/finning bedding and irregular lamination, which is formed in hyperpycnal lobe indicative of week hydrodynamic origin. The first type generated large single-layer thickness and cumulative thickness, and good reservoir properties, the second type resulted in smaller single-layer thickness and cumulative thickness, and relatively poor reservoir properties. This understanding provides valuable references for study in sedimentology of fine-grained rocks, and for shale oil exploration and development practices.
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Key words:
- sedimentary structures /
- bedding /
- lamination /
- hyperpycnal flow /
- shale oil /
- Lucaogou Formation
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表 1 芦草沟组纹层、纹层组及层理特征
Table 1. Characteristics of lamination, lamina set, and bedding of the core data of Lucaogou Formation
基本单元 特征 厚度范围/mm 纹层 水平纹层 微米级泥纹层与砂纹层水平互层，无明显层界面 0.2～2 不规则纹层 微米-毫米级泥纹层与砂纹层水平互层，无明显层界面 0.5～8 纹层组 砂泥纹层组 砂泥互层，呈现平行、不规则几何形态，有明显层界面 0.5～40 层理 块状层理 长英质颗粒片均匀分布，内部无明显界面，顶底侵蚀面 100～800 平行层理 长英质颗粒为主，顶底突变面，呈现平行特征 10～50 交错层理 长英质颗粒为主，顶底突变面，呈现斜交特征 20～10 
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