中扬子地区龙马溪组页岩有机质孔隙发育特征及控制因素——以湖南省永顺地区永页3井为例

doi:10.11743/ogg20200516

Abstract

Abstract:

The exploration and development of shale gas in the Jiaoshiba gas field, a major Longmaxi Formation shale gas field in the Upper Yangtze Region, has made great success.However, the resource potential of the formation is still unclear.To this end, the characteristics and controlling factors of organic-matter pores in shale samples from the Well YY3 in the Yongshun area, Hunan Provinces, are analyzed to provide references for the assessment of shale reservoir properties in the formation.The Longmaxi Formation shale from the Well YY3 contains typical marine organic matter, and is characterized by a total organic matter content (TOC) of 0.65%-3.81% (1.87% on average), high-to-over-mature thermal maturity and low porosity (2.06% on average).The pores in the samples were systematically observed under scanning electron microscopy (SEM) after an Argon-ion-polishing treatment.Moreover, the characteristics of organic-matter pores were analyzed with energy spectrum test and JMicro Vision image processing software; and a new characterization method based on SEM images was proposed to describe the pore connectivity.The results show that the Longmaxi Formation shale contains mostly migrated organic matters with well-developed pore systems and native organic matters with under-developed pores.As a whole, the pore growth in organic matters of the shale in the formation is heterogeneous and mainly controlled by the micro-components of organic matters as well as the content of organic carbon and clay minerals, and at higher thermal evolution stages, organic carbon content plays a critical role in the development of pores in organic matters.

Key words: organic-matter pore, organic-matter thin section porosity, shale, Longmaxi Formation, Well YY3, Middle Yangtze Region

CLC Number:

TE122.2

Jian Hong, Xuan Tang, Cong Zhang, Huang Huang, Yansheng Shan, Yuyan Zheng, Huangchang Xie. Characteristics and controlling factors of organic-matter pores in Longmaxi Formation shale, Middle Yangtze Region: A case study of Well YY3[J]. Oil & Gas Geology, 2020, 41(5): 1060-1072.

Figures/Tables 15

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样品编号	深度/m	TOC/%	岩石密度/ (g·cm^-3)	有机质面孔率/ %	有机质孔隙度/ %	总孔隙度/ %	有机孔占比/ %	连通性参数C
YY-1	2 463.28	0.65	2.72	1.93	0.028	1.10	2.5	0.211 2
YY-2	2 525.36	0.93	2.70	7.86	0.163	1.03	15.8	0.470 2
YY-3	2 534.28	1.43	2.69	10.07	0.323	2.02	16.0	0.614 7
YY-4	2 540.55	1.58	2.74	11.09	0.400	2.76	14.5	0.598 4
YY-5	2 541.48	2.78	2.65	7.93	0.486	2.89	16.8	0.356 7
YY-6	2 542.09	3.81	2.59	3.74	0.308	2.73	11.3	0.328 9
YY-7	2 546.82	1.93	2.64	7.67	0.326	1.86	17.5	0.479 9
平均值		1.87	2.68	6.99	0.337	2.06	16.4	0.424 9

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Characteristics and controlling factors of organic-matter pores in Longmaxi Formation shale, Middle Yangtze Region: A case study of Well YY3

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