Study on Shale Organic Porosity in the Longmaxi Formation, AnYe-1 Well Using Field Emission-Scanning Electron Microscopy and PerGeos System
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摘要: 安页1井是中国地质调查局在我国南方盆地外围武陵山复杂构造区实施并取得页岩气突破的一口地质调查参数井。本文以安页1井龙马溪组富有机质页岩为研究对象，利用场发射扫描电镜，研究了上扬子地区盆地外围龙马溪组富有机质页岩储集空间类型，并将PerGeos数字岩石处理系统引入有机质孔隙定量分析，定量刻画了有机质微纳米孔隙结构及发育特征。研究认为：有机质孔隙是安页1井龙马溪组富有机质页岩最主要的储集空间，形态上表现为填隙于自生硅质中的有机质发育着均匀海绵状孔隙结构，或与黏土矿物交互生长的有机质发育着气泡状孔隙结构，这两类不同赋存形态的有机质的孔隙均极为发育。通过PerGeos数字岩石系统处理，揭示了两类有机质孔隙孔径发育呈现双众数分布，其中海绵状结构的有机质孔隙孔径众数为5~10 nm，气泡状结构的有机质孔隙孔径众数为51~100 nm，有机质孔隙主要介于中孔~宏孔范畴。安页1井龙马溪组有机质孔隙的大量发育，指示了盆地外围的龙马溪组页岩经历了较强烈的生烃过程并具有较好的储集能力，具备良好的开发潜力。
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关键词:
- 龙马溪组 /
- 页岩 /
- 场发射扫描电镜 /
- 有机质微纳米孔隙 /
- PerGeos数字岩石处理系统
Abstract:BACKGROUND AnYe-1 well is a geological survey parameter well implemented by China Geological Survey. It has achieved shale gas breakthrough in the Wuling complex structural area outside the southern basin of China. BAOBJECTIVES To quantitatively characterize micro-and nano-pore structure and development characteristics of organic matter, by researching organic matter pore on Longmaxi shale of AnYe-1 well. METHODS Field Emission-Scanning Electron Microscope was used to study the reservoir type of the organic-rich shale of the Longmaxi Formation at the periphery of the basin in the Upper Yangtze region, and the PerGeos digital rock treatment system was introduced into the organic pores quantitative analysis. RESULTS The organic pore is the most important reservoir space of the organic-rich shale of the Longmaxi Formation in Anye-1 well. It is characterized by organic matter interstitially forming in the authigenic siliceous organic matter with uniform sponge-like pore structure, or organic matter that interacts with clay minerals with a bubble-like pore structure. Pores in two different types of organic matter are extremely developed. The PerGeos digital rock system reveals that the pore sizes of the two organic pores show a bimodal distribution, in which the pore size of the organic pores with the sponge-like structure is 5 to 10 nm, and the pore size of the organic pores with the bubble-like structure is 51 to 100 nm. The organic pores are mainly in the mesopore to macropore category. CONCLUSIONS The abundant development of organic matter pores in the Longmaxi Formation in AnYe-1 well indicates that the Longmaxi Formation shale in the periphery of the basin has experienced a strong hydrocarbon generation process and has a good storage capacity, showing a potential for development in the future. -
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表 1 两类有机质及其孔隙发育特征、参数对比
Table 1. A comparison of pores characteristics and parameters developed in two types of organic matters
统计参数(PerGeos系统统计及电镜观察) 填隙于自生硅质中的有机质 与黏土矿物交互生长的有机质 两类有机质占总有机质百分比(观察) 约55% 约40% 有机孔等效圆孔隙直径主体范围(观察) 10~50 nm 30~120 nm 数字岩石系统统计的单位面积内(μm2)孔隙个数范围 200~500 10~50 数字岩石系统统计的单个有机质面孔率范围(%) 15~30 5~40 数字岩石系统统计的孔径平均值 20 85 数字岩石系统统计的孔径D10/D50/D90值(或范围) 6/6/15~30 50/60/80~120 
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