四川盆地富顺-永川地区龙马溪组页岩有机孔特征及其影响因素

doi:10.11743/ogg20210607

Abstract

Abstract:

The Lower Paleozoic marine shale sequences are widely developed in the southern part of Sichuan Basin. Among others, the Longmaxi Formation shale possesses high-quality source rocks favorable for shale gas enrichment. We discuss the characteristics of and factors influencing the organic pores in the Lower Silurian Longmaxi Formation, Fushun-Yongchuan area, based on coring data obtained from the drilling of organic-rich shale, as well as related analysis and tests. The research results indicate that the organic matter abundance of the Longmaxi Formation shale is high with a TOC content ranging from 2.45% to 5.59%, and its thermal evolution reaches a high-to-over-mature stage with a vitrinite reflectance (R_o) of 1.97% to 2.23%, providing a favorable basis for the growth of organic pores. As important reservoir space for shale gas, most organic pores are round-, oval- or concave-shaped under scanning electron microscopy (SEM) observation, and a few occur in strips and/or irregular polygons; all pores are smooth-edged. Besides, nitrogen adsorption and high pressure mercury intrusion porosimetry (MIP), show that these organic pores are relatively small in size, most of which are supposed to be ascribed to mesopores, accounting for about 57%. Then, we quantitatively analyze the organic pores across the study area by establishing a relationship model between porosity of organic pores and spectral gamma-ray (GR) logs (U), and the results show that the porosity of organic pores varies between 1.10% and 3.64%, with an average of 2.15%. There are multiple factors related to the development and preservation of organic pores. The correlation between organic pore porosity with contents of clay minerals, brittle minerals and TOC, is set up and shows that the porosity of organic pores is positively correlated with contents of brittle minerals and TOC but negatively with clay mineral content. Compaction has a destructive effect on the preservation of organic pores, and a higher formation pressure coefficient is conducive to the preservation of organic pores.

Key words: organic pore, brittle mineral, shale, Longmaxi Formation, Fushun-Yongchuan area, Sichuan Basin

CLC Number:

TE122.2

Xiya Yang, Chenglin Liu, Wenping Liu, Haolin Ren. Characteristics of and factors influencing organic pores in the Lower Silurian Longmaxi Formation, Fushun-Yongchuan area, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(6): 1321-1333.

Figures/Tables 14

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Table 1

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样品编号	深度/m	有机孔像素	无机孔像素	总像素	有机孔面孔率/%	无机孔面孔率/%
1	3 635.98	4 495	5 776	241 664	1.86	2.39
2	3 641.70	5 341	2 030	241 664	2.21	0.84
3	3 644.30	4 857	3 625	241 664	2.01	1.50
4	3 656.63	5 607	5 993	241 664	2.32	2.48
5	3 667.78	6 187	5 945	241 664	2.56	2.46
6	3 670.85	6 718	1 474	241 664	2.78	0.61
7	3 676.80	4 882	6 017	241 664	2.02	2.49
8	3 682.50	4 592	13 171	241 664	1.90	5.45
9	3 777.00	8 144	4 882	241 664	3.37	2.02
10	3 784.50	5 196	3 987	241 664	2.15	1.65
11	3 791.50	1 885	7 105	241 664	0.78	2.94
12	3 797.00	5 413	4 181	241 664	2.24	1.73
13	3 800.00	6 887	4 567	241 664	2.85	1.89
14	3 802.50	6 477	1 764	241 664	2.68	0.73
15	3 806.00	7 177	5 872	241 664	2.97	2.43
16	3 809.80	7 733	1 643	241 664	3.20	0.68
17	3 821.82	5 365	6 791	241 664	2.22	2.81
18	3 826.99	2 078	7 178	241 664	0.86	2.97
19	3 829.58	5 437	4 374	241 664	2.25	1.81

样品编号	深度/m	有机孔面孔率/%	无机孔面孔率/%	有机孔占比	总孔隙度/%	有机孔孔隙度/%
1	3 635.98	1.86	2.39	0.44	3.97	1.74
2	3 641.70	2.21	0.84	0.72	3.17	2.29
3	3 644.30	2.01	1.50	0.57	3.31	1.89
4	3 656.63	2.32	2.48	0.48	3.75	1.81
5	3 667.78	2.56	2.46	0.51	3.18	1.62
6	3 670.85	2.78	0.61	0.82	3.28	2.68
7	3 676.80	2.02	2.49	0.45	2.81	1.26
8	3 682.50	1.90	5.45	0.26	4.78	1.24
9	3 777.00	3.37	2.02	0.63	4.55	2.84
10	3 784.50	2.15	1.65	0.57	4.66	2.64
11	3 791.50	0.78	2.94	0.21	5.44	1.14
12	3 797.00	2.24	1.73	0.56	5.10	2.88
13	3 800.00	2.85	1.89	0.60	4.17	2.51
14	3 802.50	2.68	0.73	0.79	4.63	3.64
15	3 806.00	2.97	2.43	0.55	4.08	2.24
16	3 809.80	3.20	0.68	0.83	3.78	3.12
17	3 821.82	2.22	2.81	0.44	5.49	2.43
18	3 826.99	0.86	2.97	0.22	4.88	1.10
19	3 829.58	2.25	1.81	0.55	3.32	1.84

井号	龙一₁⁴小层有机孔孔隙度/%	龙一₁³小层有机孔孔隙度/%	龙一₁²小层有机孔孔隙度/%	龙一₁¹小层有机孔孔隙度/%	平均有机孔孔隙度/%
D201	2.54	3.12	3.92	5.40	3.75
G202	2.45	4.86	4.09	5.49	4.22
G205	2.42	3.16	3.16	4.89	3.41
L101	2.97	3.33	3.32	4.54	3.54
T101	2.31	3.03	3.43	3.88	3.16
Ti201	2.37	3.27	3.18	4.32	3.29
Y101	2.82	3.48	3.74	5.44	3.87
Z101	3.15	3.05	2.93	3.97	3.28

井号	深度/m	干酪根类型指数	有机质类型
D201井	3 635.98	98	Ⅰ型
	3 644.30	100	Ⅰ型
	3 656.63	35	Ⅱ₂型
	3 667.78	78	Ⅱ₁型
	3 676.80	69	Ⅱ₁型
G202井	3 777.00	39	Ⅱ₂型
	3 791.50	90	Ⅰ型
	3 800.00	65	Ⅱ₁型
	3 806.00	83	Ⅰ型
	3 826.99	88	Ⅰ型

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Characteristics of and factors influencing organic pores in the Lower Silurian Longmaxi Formation, Fushun-Yongchuan area, Sichuan Basin

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