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Quantitative Characterization of Inorganic Pores in Sinian Doushantou Dolomitic Shale Based on FIB-SEM in Western Hubei Province, China
ACS Omega ( IF 3.7 ) Pub Date : 2024-02-07 , DOI: 10.1021/acsomega.3c08640 Yinan Liu 1 , Peng Zong 2 , Li Wang 3 , Yanyong Xu 1 , Jingzhen Guo 4 , Heng Wu 2
ACS Omega ( IF 3.7 ) Pub Date : 2024-02-07 , DOI: 10.1021/acsomega.3c08640 Yinan Liu 1 , Peng Zong 2 , Li Wang 3 , Yanyong Xu 1 , Jingzhen Guo 4 , Heng Wu 2
Affiliation
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Unlike traditional shale gas reservoirs, where organic matter pores dominate, inorganic pores are the primary reservoir space in the Sinian (Ediacaran) high-maturity Doushantou dolomitic shale in western Hubei Province, China. The inorganic pore characteristics of Doushantuo shale and its influence on shale gas aggregation were investigated by examining the TOC content, thermal maturity, mineralogical composition, and field-emission scanning electron microscopy (SEM) and focused ion beam scanning electron microscopy (FIB-SEM) of drill cores. The results show that the shale mineral composition in the study area is primarily dolomite and plate-shaped interparticle–intercrystalline pores associated with dolomite are widespread inorganic pores in dolomitic shale. Interparticle–intercrystalline pores account for 75% of the total pores, with a pore size distribution mainly between 50 and 300 nm, as extracted from the 3D pore network model (PNM). Compared with organic pores, interparticle–intercrystalline pores provide greater space for gas storage and have a strong coupling relationship with the hydrocarbon generation and evolution of organic matter. Therefore, the inorganic pores in the Doushantuo Formation play a vital role in the enrichment and accumulation of shale gas. This study aims to establish a scientific basis for understanding the enrichment mechanism of shale gas in Doushantuo dolomitic shale and other inorganic pore-dominated shales in southern China.
中文翻译：
基于FIB-SEM的鄂西震旦系陡山头白云质页岩无机孔隙定量表征
与以有机质孔隙为主的传统页岩气藏不同，鄂西震旦系（埃迪卡拉系）高成熟度陡山头白云质页岩的主要储集空间是无机孔隙。通过TOC含量、热成熟度、矿物成分、场发射扫描电镜（SEM）和聚焦离子束扫描电镜（FIB-SEM）等研究手段，研究陡山沱页岩无机孔隙特征及其对页岩气聚集的影响钻芯。结果表明，研究区页岩矿物成分主要为白云石，与白云石伴生的板状粒间晶间孔是白云质页岩中广泛分布的无机孔隙。从 3D 孔隙网络模型 (PNM) 中提取，粒间-晶间孔隙占总孔隙的 75%，孔径分布主要在 50 至 300 nm 之间。与有机质孔隙相比，粒间—晶间孔隙为气体储存提供了更大的空间，并且与有机质的生烃和演化具有较强的耦合关系。因此，陡山沱组无机孔隙对页岩气的富集和聚集起着至关重要的作用。本研究旨在为认识我国南方陡山沱白云质页岩及其他无机孔隙为主的页岩页岩气富集机制奠定科学基础。
更新日期：2024-02-07
中文翻译：
基于FIB-SEM的鄂西震旦系陡山头白云质页岩无机孔隙定量表征
与以有机质孔隙为主的传统页岩气藏不同，鄂西震旦系（埃迪卡拉系）高成熟度陡山头白云质页岩的主要储集空间是无机孔隙。通过TOC含量、热成熟度、矿物成分、场发射扫描电镜（SEM）和聚焦离子束扫描电镜（FIB-SEM）等研究手段，研究陡山沱页岩无机孔隙特征及其对页岩气聚集的影响钻芯。结果表明，研究区页岩矿物成分主要为白云石，与白云石伴生的板状粒间晶间孔是白云质页岩中广泛分布的无机孔隙。从 3D 孔隙网络模型 (PNM) 中提取，粒间-晶间孔隙占总孔隙的 75%，孔径分布主要在 50 至 300 nm 之间。与有机质孔隙相比，粒间—晶间孔隙为气体储存提供了更大的空间，并且与有机质的生烃和演化具有较强的耦合关系。因此，陡山沱组无机孔隙对页岩气的富集和聚集起着至关重要的作用。本研究旨在为认识我国南方陡山沱白云质页岩及其他无机孔隙为主的页岩页岩气富集机制奠定科学基础。
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