Abstract：This paper scanned systematically the black shale samples of the Lower Paleozoic Niutitang Formation of Lower Cambrian and Longmaxi Formation of Lower Silurian in northwestern Hunan using scanning electron microscope(SEM). The micropore types, characteristics, forming and evolution process were further analyzed.A variety of pores developed in the two sets of black shale can be summarized into three broad categories: Mineral matrix pore,organic pore and microfracture.The mineral matrix pore can be subdivided into intergranular skeleton pore,floccule pore,dissolution pore and matrix intercrystal pore. The organic pore mainly include biological skeleton pore and residual pore of hydrocarbon generation.Original depositional environment and diagenetic process determine the pore system in the shale,and different diagenetic stages control the evolution of pore texture as well as affect the occurrence of shale gas. The complex network of micropores in shale provides the effective space for oil or gas reservoir and the main channel for shale gas seepage,which has an important significance to shale gas accumulation and development.
Fan Erping,Tang Shuheng,Zhang Chenglong et al. Scanning-electron-microscopic micropore characteristics of the Lower Paleozoic black shale in northwestern Hunan Province[J]. JOPC, 2014, 16(1): 133-142.
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