氮气吸附滞后回环定量分析及其在孔隙结构表征中的指示意义

doi:10.11743/ogg20230219

Abstract

Abstract:

Low-temperature nitrogen adsorption can form a “hysteresis loop”， whose geometry and area can effectively reflect the pore structure of porous media and its retention effect on adsorbed gas. However， the role of the “hysteresis loop” in quantitative characterization of shale pore structure has often been ignored. The study aims to clarify whether shale can form “hysteresis loop” in low-temperature nitrogen adsorption-desorption experiment and the determinants on hysteresis loop’s area with experiments on the 7^th member of the Upper Triassic Yanchang Formation shale （Chang 7 shale） in the Ordos Basin. Various measures are applied in the study， including qualitative observation of pore structure under field-emission scanning electron microscopy （FE-SEM） and quantitative characterization of pore structure by low-temperature nitrogen adsorption test， hysteresis-loop quantitative analysis， total organic carbon （TOC） content analysis， pyrolysis and X-ray diffraction （XRD） experiments. The following results are obtained. First， whether shale can form a hysteresis loop in the low-temperature nitrogen adsorption-desorption experiment has an apparently positive correlation with the specific surface area， specific pore volume， clay mineral content， and pore structure fractal dimension， and an evidently negative correlation with the TOC content， while no apparent correlation with the average pore size， pore surface fractal dimension， highest pyrolysis peak temperature， and content of brittle minerals. Second， the hysteresis loop area depends on the development degree of the cylindrical pores with both ends open， ink-bottle pores， or parallel plate pores， the proportion of which to the total pores can be quantitatively evaluated by the hysteresis loop area. Third， the open-ended cylindrical pores， ink-bottle pores， or parallel plate pores in the samples from Chang 7 shale are mainly of the intergranular pores in clay minerals. Therefore， there is an apparently positive correlation between the hysteresis loop area and the content of clay minerals.

Key words: hysteresis loop, nitrogen adsorption, pore structure, shale, Yanchang Formation, Ordos Basin

CLC Number:

TE122.2

Zezhang SONG, Abula ABIDE, Mingyang LYU, Yueqiao ZHANG, Fujie JIANG, Zheyu LIU, Wei ZHENG, Xiayang WANG. Quantitative analysis of nitrogen adsorption hysteresis loop and its indicative significance to pore structure characterization：A case study on the Upper Triassic Chang 7 Member， Ordos Basin[J]. Oil & Gas Geology, 2023, 44(2): 495-509.

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样品号	全岩矿物组分含量/%
样品号	石英	钾长石	斜长石	方解石	白云石	菱铁矿	黄铁矿	黏土矿物
Z22-1584.65*	22.2	0	6.8	0	0	0	0	71.0
Z22-1626.00	33.4	0	10.9	0	0	0	0	55.7
Z22-1632.45	10.8	4.7	8.7	0	0	6.5	0	69.3
LI231-2105.90	32.4	0	0	0	0	0	12.7	54.9
YAN56-3032.10*	42.6	0	5.6	0	0	0	0	51.8
YAN56-3058.40	45.3	0	0.0	0	0	0	1.9	52.8
Z22-1563.40	21.2	0	18.3	0	0	0	13.5	47.0
Z22-1569.10	19.1	0	21.7	0	0	0	11.4	47.8
LI68-2078.90*	42.3	0	9.9	0	0	0	17.3	30.5

滞后回环类型	样品编号	深度/m	滞后回环面积/ （mL·nm^-1·g^-1）	DFT比表面积/ （m²·g^-1）	DFT比孔容/ （mL·g^-1）	DFT平均孔径/nm	孔隙表面分形维数（D₁）	孔隙结构分形维数（D₂）
A类	Z22	1584.65	0.578 68	13.840	0.048 55	7.032	2.518	2.609
	Z22	1626.00	0.565 96	15.080	0.048 05	7.032	2.533	2.605
	Z22	1632.45	0.711 39	20.210	0.060 20	2.583	2.579	2.620
平均值			0.618 68	16.377	0.052 27	5.549	2.543	2.611
B类	LI231	2105.90	0.561 16	9.872	0.046 56	7.032	2.451	2.452
	YAN56	3032.10	0.425 26	8.828	0.043 66	6.079	2.450	2.487
	YAN56	3058.40	0.742 62	10.210	0.051 74	7.032	2.445	2.438
平均值			0.576 35	9.637	0.047 32	6.714	2.449	2.459
C类	Z22	1563.40	0.203 17	7.641	0.038 32	12.120	2.528	2.458
	Z22	1569.10	0.143 76	5.675	0.026 76	7.032	2.558	2.479
	LI68	2078.90	0.147 53	8.459	0.027 35	2.583	2.627	2.545
平均值			0.164 82	7.258	0.030 81	7.245	2.571	2.494

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Quantitative analysis of nitrogen adsorption hysteresis loop and its indicative significance to pore structure characterization：A case study on the Upper Triassic Chang 7 Member， Ordos Basin

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