页岩热模拟过程中液态烃含量变化及对物性的影响

doi:10.11743/ogg20200619

Abstract

Abstract:

In the process of thermal simulation, the changes of liquid hydrocarbon content and occurrence mode are important to the in-depth study of pore evolution and shale reservoir characterization.A thermal simulation experiment of semi-closed system was conducted on the low mature Dalong Formation shale from Shangsi section, Guangyuan area, Northwestern Sichuan Basin.The original shales and thermally simulated samples were subjected to argon ion milling-scanning electron microscopy (SEM) observation.The simulated samples and their extracted samples to low temperature nitrogen adsorption experiment.The results show that organic pores are not well developed in the original Dalong Formation shale.With the increase of temperature in thermal simulation, organic pores begin to develop with increasing number and pore size.In addition, the specific surface area and pore volume also increase accordingly, and they are in a good linear positive correlation with the temperature in thermal simulation.However, there is no significant change in the mesopore and macropore volumes with the temperature increase.On the other hand, a positive correlation is suggested between TOC consumption and specific surface area, pore volume, indicating a significant increase of the number of micro-pores during the transformation from organic matter to hydrocarbon.The SEM observation revealed that liquid hydrocarbon mainly exists within shale inter-crystalline pores and organic pores, and its content is started with a quick leap but is followed by a sharp drop with temperature increase, reaching a peak at a thermal simulation temperature of 325 ℃ to 340 ℃, but almost drop to zero at a temperature of 450 ℃ or higher.After liquid hydrocarbon extracting, nitrogen adsorption capacity of the samples is generally enhanced.The samples' pore size distribution is single peaked with a peak within a pore size range of 14.36-23.56 nm, while for the liquid hydrocarbon extracted samples their peak pore size distribution moves to smaller pores of 12.06-22 nm.The specific surface area, micro-pore and mesopore volumes of the extracted samples increase significantly compared to those of the original samples in thermal simulation.The correlation between thermal simulation temperature and specific surface area, micropore volume becomes better for extracted samples, reflecting that the liquid hydrocarbon mainly exists in shale micro-pores and some mesopores.

Key words: liquid hydrocarbon, extraction, pore evolution, physical property, thermal simulation experiment, shale, Dalong Formation, Sichuan Basin

CLC Number:

TE122.1

Mo Deng, Xinguo Duan, Changbo Zhai, Shengxiang Long, Zhenheng Yang, Lunju Zheng, Zhangchang Li, Taotao Cao. Variation in liquid hydrocarbon content during thermal simulation and its influence on physical property of shale[J]. Oil & Gas Geology, 2020, 41(6): 1310-1320.

Figures/Tables 11

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样品编号	模拟温度/℃	TOC/%	S₁/(mg·g^-1)	S₂/(mg·g^-1)	HI/(mg·g^-1)	T_max/ ℃	氯仿沥青“A”含量/%
DL-O	原岩	9.83	1.03	37.70	371	440	1.11
DL-325	325	7.17	2.21	22.60	324	439	3.73
DL-340	340	7.30	4.84	18.81	258	438	3.34
DL-360	360	5.76	4.95	9.72	164	444	1.97
DL-400	400	6.26	2.56	246.00	35	571	0.59
DL-420	420	6.26	1.64	1.37	20	587	0.24
DL-450	450	7.71	0.53	0.56	7	605	0.04
DL-480	480	4.15	0.47	0.19	4	607	0.04
DL-500	500	4.10	0.14	0.12	3	607	0.02
DL-550	550	5.38	0.07	0.00	0	—	0.00

样品编号	模拟条件		氮气吸附结果
样品编号	地层压力/MPa	静岩压力/MPa	比表面积/(m²·g^-1)	孔体积/(cm³·g^-1)	微孔体积/(cm³·g^-1)	中孔体积/(cm³·g^-1)	大孔体积/(cm³·g^-1)
DL-O			0.92	0.006	0.000 2	0.003 0	0.003 3
DL-325	23	48	1.06	0.011	0.000 4	0.004 9	0.005 5
DL-340	34	70	1.08	0.013	0.000 5	0.005 7	0.007 0
DL-360	49	102	3.68	0.022	0.000 6	0.008 0	0.013 0
DL-400	53	110	3.02	0.024	0.001 0	0.010 9	0.011 7
DL-420	55	115	1.83	0.020	0.000 9	0.007 7	0.011 5
DL-450	58	120	2.18	0.019	0.001 0	0.008 2	0.010 3
DL-480	62	130	3.52	0.022	0.001 7	0.008 6	0.012 0
DL-500	67	140	6.84	0.027	0.003 3	0.010 1	0.014 0
DL-550	72	150	8.02	0.014	0.003 8	0.006 8	0.003 0

样品编号	比表面积/(m²·g^-1)	孔体积/(mL·g^-1)	微孔体积/(mL·g^-1)	中孔体积/(mL·g^-1)	大孔体积/(mL·g^-1)
DL-325-E	3.11	0.033	0.001 3	0.01 3	0.019
DL-340-E	3.72	0.032	0.001 4	0.01 4	0.017
DL-360-E	4.17	0.027	0.001 5	0.00 9	0.016
DL-400-E	7.76	0.040	0.003 3	0.01 5	0.022
DL-420-E	9.92	0.039	0.004 0	0.01 8	0.017
DL-450-E	8.26	0.018	0.003 5	0.01 0	0.004
DL-480-E	9.01	0.019	0.003 8	0.008 7	0.006 8
DL-500-E	9.58	0.039	0.004 1	0.014	0.021
DL-550-E	15.37	0.034	0.006 7	0.012	0.015

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Variation in liquid hydrocarbon content during thermal simulation and its influence on physical property of shale

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