川南—黔北地区下古生界页岩孔隙发育特征

doi:10.3969/j.issn.1673-8926.2015.04.007

Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (4): 47-52.doi: 10.3969/j.issn.1673-8926.2015.04.007

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Pore characteristics of shale of Lower Paleozoic in southern Sichuan-northern Guizhou

Yang Wei¹^，²，Chen Guojun¹， Hu Shijun¹^，³， Lu Chengfu¹， Xu Yong¹^，³， Yang Shuang¹^，³

1. Key Laboratory of Petroleum Resources ， Gansu Province/Key Laboratory of Petroleum Resources Research ， Institute of Geology and Geophysics ， Chinese Academy of Sciences ， Lanzhou 730000 ， China ； 2. PetroChina Research Institute of Petroleum Exploration & Development-Northwest ， Lanzhou 730020 ， China ； 3. University of Chinese Academy of Sciences ， Beijing 100049 ， China

Online:2015-07-20 Published:2015-07-20

Abstract

Abstract:

Pore types, size, morphology, distribution and fracture feat ures by field emission scanning electron microscope imaging were studied on shale samples of the Lower Paleozoic Niutitang Formation, Wufeng FormationLongmaxi Formation in the southern Sichuan-northern Guizhou. The results show that there are four main pore types developed in shale, including: intergranular pores, organic-matter pores, dissolved pores and microfracture. Organicmatter pores developed well in shale, which is favor of storing adsorbing-gas. Dissolved pores distributed sporadically, but the cumulative pore volume is much larger with wider pore diameters which are almost macropores and even reach to micrometer-scale. Intergranular pores developed relatively less, with little contribution to pore volume. Microfractures developed in shale can connect other types of pores, which is beneficial to shale gas store and flow. Additionally, the major components of shale are composed of quartz, feldspar, carbonate and clay minerals. The brittle minerals content with an average of 54.9% is conducive to the formation fracturing and exploration.

Key words: heterogeneity, stochastic simulation, reservoir geologic model, uncertainty

Yang Wei，Chen Guojun， Hu Shijun， Lu Chengfu， Xu Yong， Yang Shuang. Pore characteristics of shale of Lower Paleozoic in southern Sichuan-northern Guizhou[J].Lithologic Reservoirs, 2015, 27(4): 47-52.

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