Research on Micro Water-Resisting Property of Top Ordovician Strata in Pingshuo Coal Area


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It is important to research the existence of the top Ordovician water-resisting strata, under which the regional Ordovician karts aquifers pose great water pressure threat to the upper late Carboniferous coal seam mining. So we take the samples from JK-02 to do mercury test, SEM and microscopic identification. The results show: ① 0 ~10m of the top strata of Ordovician is made of crystal powder dolomite. Most of the pores of the strata are intercrystalline pores, intercrystalline dissolved pores, microspore as well as stylolite ,and part of which are filled by calcite and clay. Its porosity is 11.3242%; and permeability 6.2324;and diameter of volume median 66.3nm; capillary median pressure 6.88MPa; mercury withdrawal efficiency is 42.22%; maximum pore throat's diameter is 145.32μm, and effective pore volume is about 13% out of total pore volume. ②10 ~112m of the top Ordovician is mainly made of powder crystal limestone and calsilutites. The most of pores are micropore; its porosity is only 0.8409% and permeability 7.0438; and diameter of volume median 66.3nm; and capillary median pressure 5.497~34.391MPa; maximum pore throat's diameter is 0.0227~0.453μm; ③The number of pores and the porosity of the limestone are less than that of the dolomite. The limestone of the top Ordovician can serve as water-resisting layer for its lower permeability and compactness if there is no water-conducted faults.



Edited by:

Xuejun Zhou




H. R. Rong et al., "Research on Micro Water-Resisting Property of Top Ordovician Strata in Pingshuo Coal Area", Applied Mechanics and Materials, Vols. 90-93, pp. 1383-1389, 2011

Online since:

September 2011




[1] Xiexing Miao, Ronghua Chen, Haibo Bai. Fundamental concepts and mechanical analysis of water-resisting key strata in water-preserved mining[J]. Journal of China Coal Society, 32(6): 561~564 In Chinese.

[2] Xiexing Miao, Hai Pu, Haibo Bai. Principle of water-resisting key strata and its application in water-preserved mining [J]. Journal of China University of Mining & Technology, 2008, 37(1): 1~4. In Chinese.

[3] Haibo Bai. The seepage characteristics and role of key aquifuge in top Ordovician [D]. Xuzhou: China University of Mining & Technology. In Chinese.

[4] Shaoxie Fang. Stratigraphy of oil and gas reservoir [M]. Beijing: China University of Petroleum, 1998 In Chinese.

[5] Yinan Qiu. Assessment technology of petroleum reservoir [M]. Beijing: Petroleum Industry Press, 1994 In Chinese.

[6] Jianxiong Qin, Yunfu Zeng. Diagenesis and porosity evolution of the lower Ordovician carbonate rocks in the eastern Ordos Basin [J]. Petroleum Exploration and Development, 1993, 20(3): 91~103 In Chinese.

[7] Yongshen Cheng, Shunlin Chen, Hai Wang et al. Hydrocarbon accumulation and models for the Palaeozoic reservoirs in the peripheral areas of the Nanpu depression[J]. Sedimentary geology and Tethyan geology, 2008, 28(1): 76~81 In Chinese.

[8] AEA/UNESCO. Guidebook on Nuclear Techniques in Hydrology[M]. TECHNICAL REPORTS SERIES NO. 91, 1983 Edition.

[9] Hai-bo BAI, Xie-xing MIAO. The Newly-formed Characteristics and Controlling Action of Wangzhuang—Changcun Fault Belt[J]. Journal of Liaoning Technical University, 2006, 25(sup. ): 25-2 In Chinese.

[10] Kong DF, Zhu CR, et al (translated). Soil and rock engineering. Beijing: Geological Press of House, (1990).

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