沁水盆地榆社区块太原组煤系页岩中水含量及其对孔隙特征影响

doi:10.11764/j.issn.1672-1926.2020.06.004

Abstract

Abstract:

In the Yushe area of the Qinshui Basin， the coal strata generally have a certain amount of shale gas， and realization of the synchronous exploitation of coal-bed gas and shale gas will enhance the development efficiency in this area. However， the effective pore structures of the coal-bearing shales are still unclear in the Yushe area， restricting the evaluation of in-situ shale gas content and shale gas potential. In the present study， a suit of fresh shale core samples collected from the Taiyuan Formation in the Yushe area of the Qinshui Basin were used to investigate their geochemical characteristics， water contents and the pore structures on the as-received （moist） and dry conditions. The results indicate that the shale samples in coal-bearing strata have a low water content with a range of 0.60-4.37 mg/g， and the water content in the shales were significantly controlled by the clay mineral content. Water in the shales can obviously reduce the shale pore volume and surface areas. Compared with that on the dry condition， the total pore volume and surface area of the shales were reduced by 34.5%-56.7% （average 46.5%） and 49.2%-62.3% （average 57.6%）， respectively. In addition， water in the shales significantly affect the pores with diameters less than 5 nm， and may completely block the micropores with diameters less than 0.5 nm.

Key words: Yushe area, Taiyuan Formation, Shales in coal-bearing strata, Water content, Pore structures

CLC Number:

TE122.2

Ji-sheng MA, Ya CAI, Zhen-qin HU, Chong LU, Wei WANG. The water content and its effects on the pore structures of the shales from the coal-bearing Taiyuan Formation in the Yushe area of the Qinshui Basin[J].Natural Gas Geoscience, 2021, 32(1): 145-154.

Figures/Tables 10

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样品号	深度 /m	层位	岩石热解（Rock-Eval）				矿物组分/%						镜质体反射率 /%	含水量/ (mg/g)
			T_max/°C	I_H/(mg/g_TOC)	I_O/(mg/g_TOC)	TOC/%	石英	黏土矿物		白云石	菱铁矿	黄铁矿
			T_max/°C	I_H/(mg/g_TOC)	I_O/(mg/g_TOC)	TOC/%	石英	伊利石	高岭石	白云石	菱铁矿	黄铁矿
YS-1	1 941.96	太原组	592	9	26	4.21	30.6	23.1	19.0	5.0	15.2	7.1	3.28	3.55
YS-2	1 944.17	太原组	596	14	2	9.88	16.4	16.1	58.0	4.0	4.5	1.0	—	4.37
YS-3	1 947.69	太原组	597	13	6	12.65	38.0	10.5	47.6	2.2	1.7	0.0	3.25	2.43
YS-4	1 949.54	太原组	597	7	9	1.15	63.0	2.2	9.9	7.8	8.6	8.5	—	0.60
YS-5	1 952.45	太原组	603	9	18	7.39	56.9	6.8	13.8	5.7	12.0	4.8	3.30	1.99
YS-6	1 956.36	太原组	601	8	11	1.52	20.6	50.1	22.0	4.7	0.8	1.8	—	3.22

样品号	深度/m	孔隙度/%	干燥状态						实取（含水）状态
			孔容/(cm³/g)			比表面积/(m²/g)			孔容/(cm³/g)			比表面积/(m²/g)
			微孔	非微孔	总孔	微孔	非微孔	总孔	微孔	非微孔	总孔	微孔	非微孔	总孔
YS-1	1 941.96	2.62	0.006	0.020	0.026	15.22	14.11	29.33	0.004	0.009	0.013	10.48	1.97	12.45
YS-2	1 944.17	4.77	0.019	0.013	0.031	46.25	10.41	56.66	0.010	0.007	0.017	26.30	2.15	28.46
YS-3	1 947.69	4.68	0.026	0.009	0.035	66.19	14.26	80.44	0.010	0.007	0.017	27.50	2.98	30.48
YS-4	1 949.54	1.20	0.004	0.008	0.013	10.03	3.76	13.78	0.001	0.007	0.008	3.66	2.40	6.06
YS-5	1 952.45	4.13	0.006	0.016	0.021	14.04	10.55	24.60	0.003	0.007	0.010	7.17	2.42	9.59
YS-6	1 956.36	4.63	0.006	0.019	0.026	15.29	13.52	28.81	0.004	0.007	0.012	10.65	1.68	12.33

样品号	深度/m	孔容减小程度/%			比表面积减小程度/%
样品号	深度/m	微孔	非微孔	总孔	微孔	非微孔	总孔
YS-1	1 941.96	29.2	52.9	47.2	30.5	86.1	57.4
YS-2	1 944.17	32.9	48.4	39.6	42.5	79.0	49.2
YS-3	1 947.69	61.8	11.4	47.8	58.5	79.6	62.3
YS-4	1 949.54	66.2	16.6	34.5	63.1	40.7	56.9
YS-5	1 952.45	53.3	57.8	56.7	48.8	78.2	61.4
YS-6	1 956.36	27.5	61.4	53.2	32.5	88.5	58.6

The water content and its effects on the pore structures of the shales from the coal-bearing Taiyuan Formation in the Yushe area of the Qinshui Basin

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