Organic rich shale pore characteristics of Western Sichuan Depression
Organic rich shale pore characteristics of Western Sichuan Depression
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发表时间：
2014
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通讯作者：
Wu We
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作者：
Wu We
采用低温氮气吸附法和场发射扫描电镜对川西坳陷富有机质页岩的孔隙特征进行了研究。结果表明，川西坳陷富有机质页岩的表面积为3。404 m2/g至19. 473 m2/g，远远超过常规油藏。泥页岩的表面积主要由孔隙和过渡孔隙提供。页岩发育一系列从中孔到中孔的连续孔隙。平均孔径范围为3。06 nm至7. 82纳米。孔隙类型主要为平行板状孔隙和一端封闭的盲孔，同时存在一定数量的墨瓶状孔隙。泥页岩的比表面积与有机碳含量呈正相关。有机碳含量和热演化程度与孔隙度呈负相关。石英等脆性矿物与表面积呈弱正相关。
The pore characteristics of the organic rich shale in Western Sichuan Depression were studied by using low temperature nitrogen adsorption method and field emission scanning electron microscopy. The results show that the surface area of organic rich shale in Western Sichuan Depression ranges from 3. 404 m2/g to 19. 473 m2/g,which is far more than that of conventional reservoir. The surface area of shale is mainly provided by micropore and transition pore. The shale develops a series of continuous porosity from micropore to mesoporous. The average pore diameter ranges from 3. 06 nm to 7. 82 nm. The pore types are mainly parallel-plate pore and blind pore,which is closed at one end with certain amounts of ink-bottle pore at the same time. The surface area of shale and content of organic carbon form positive correlation. The content of organic carbon and degree of thermal evolution are negatively correlated with aperture. Lastly fragile mineral such as quartz is weak positively correlated with surface area.