| 富有机质页岩有机质孔隙度研究——以黔西北下志留统五峰—龙马溪组为例 |
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| 引用本文： | 李博,于炳松,史淼.富有机质页岩有机质孔隙度研究——以黔西北下志留统五峰—龙马溪组为例[J].矿物岩石,2019,39(1):92-101. |
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| 作者姓名： | 李博 于炳松 史淼 |
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| 作者单位： | 中国地质大学地球科学与资源学院,北京,100083;中国地质大学地球科学与资源学院,北京,100083;中国地质大学地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家自然科学基金;中国博士后科学基金 |
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| 摘 要： | 黔西北下志留统五峰—龙马溪组是我国南方海相页岩气勘探的重要目的层,其孔隙类型除了与常规储层相似的粒间孔、粒内孔、溶蚀孔等孔隙外,还发育了大量的有机质孔。近年来,越来越多的研究发现,页岩气储层中有机质孔占有十分重要的地位。本次研究中发现页岩岩石样品中占主要体积的孔隙类型是中孔(2 nm～50 nm)占比44.16%～82.39%,其次是微孔(<2 nm)占比8.57%～41.23%,宏孔(>50 nm)最少,占比4.02%～16.41%;从场发射扫描电子显微镜照片中可以看出,许多宏孔、中孔有明显的挤压变形现象,说明岩石经历了较长时间的压实作用,并可能伴随着部分孔隙被其他矿物充填的过程。由回归分析可以看出:总有机碳(TOC)含量强烈影响微孔和中孔的发育和演化,尤其是对中孔的影响明显,TOC与这两种孔隙体积之间都存在着明显的正相关关系;石英对中孔发育有一定影响,但不如前者明显,同时石英与微孔之间存在一定的负相关关系;黏土矿物与中孔发育之间存在负相关关系;Ro与微孔、中孔占总孔隙体积的百分比有着良好的正相关关系,而与宏孔占总孔隙百分比有着良好的负相关关系。
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| 关 键 词： | 页岩 龙马溪组 高成熟度 有机质孔特征 |
PORE CHARACTERISTICS OF ORGANIC-RICH SHALE WITH HIGH THERMAL MATURITY:A CASE STUDY OF THE LOWER SILURIAN WUFENG-LONGMAXI FORMATION MARINE SHALE IN NORTHWESTERN GUIZHOU,CHINA |
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| LI Bo,YU Bingsong,SHI Miao.PORE CHARACTERISTICS OF ORGANIC-RICH SHALE WITH HIGH THERMAL MATURITY:A CASE STUDY OF THE LOWER SILURIAN WUFENG-LONGMAXI FORMATION MARINE SHALE IN NORTHWESTERN GUIZHOU,CHINA[J].Journal of Mineralogy and Petrology,2019,39(1):92-101. |
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| Authors: | LI Bo YU Bingsong SHI Miao |
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| Institution: | (School of Earth Sciences and Natural Resources,China University of Geosciences,Beijing 100083,China) |
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| Abstract: | The lower Silurian Wufeng-Longmaxi Formation marine shale with high organic matter abundance and high thermal maturity are regarded as the main shale gas reservoir in southern China.Pore types in the shale not only include the pores of the conventional reservoir(interparticle pore,intraparticle pore,and dissolution pore) but also the occurrence of a large amount of organic matter pore(OM pore),which plays an important role in the formation of shale gas reservoir.Study shows that the pores in the samples from the lower Silurian Wufeng-Longmaxi Formation marine shale are characterized by mesoscopic pores(2 nm^50 nm in diameter,accounting for 44.16%~82.39%),followed by microscopic pore(<2 nm,accounting for 8.57%~41.23%)and macroscopic pores(>50 nm,accounting for 4.02%~16.41%).Field Emission Scanning Electron Microscopy(FESEM) analysis shows that many macroscopic pores and mesoscopic pores are deformed and resulted from the long-time compaction,accompanied by some pore filling process.Linear-regression analysis indicates that the TOC content strongly influences the development and evolution of the microscopic pores and mesoscopic pores,especially for the mesoscopic pores.TOC content has positive relation with the volume of the above mentioned two pore types.Meanwhile,quartz also has certain influence on the microscopic pore volume,but there is negative correlation between quartz content and microscopic pore volume.It reveals that there is also a negative correlation between mesoscopic pore development and clay mineral content.Ro(vitrinite reflectance) of the shale has positive correlation with the percentage of microscopic pore and mesoscopic pore accounting for the total pore volume.With the increase of the Ro,the percentage of the microscopic pore and macroscopic pore rises,while the percentage of mesoscopic pore declines. |
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| Keywords: | lower Silurian Longmaxi Formation shale high maturity pore characteristics |
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