四川盆地东部龙马溪组页岩气成藏地质条件对比分析

doi:10.19388/j.zgdzdc.2018.04.03

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Abstract In order to reveal the geological regularity of shale gas reservoir in eastern Sichuan Basin, the geological conditions of shale gas accumulation in Jiaoshiba area, Pengshui area and Baojing area were analyzed and compared. The results show that foreland basin in eastern Sichuan Basin was formed in the deposition period of Longmaxi Formation, so enriched organic carbonaceous shale was deposited to provide material conditions for the generation of shale gas. The depositional center of the foreland basin was located in Chongqing, and carbonaceous shale thickness decreased from the center to the periphery. The abundance of organic matter in the carbonaceous shale, the maturity of the organic matter and formation pressure all decreased from the center to the periphery. The hydrocarbon generation time was shorter from west of the basin to the east. Shale gas reservoir in Jiaoshiba area was mainly with space pore, While it was mainly with fracture pore in Baojing area, Hunan Province. Reservoir pore space becomes narrow and the degree of fracture was increasing from west to east. Tectonic movement has great destructive effect on shale gas accumulation and it was gradually weakened from east to west. The comprehensive analysis shows that from Jiaoshiba area in the eastern part of Sichuan Basin to Baojing in Hunan, the shale gas accumulation conditions became worse and the difficulty of exploration was increasing.

Key words： Sichuan Basin geological condition of shale gas accumulation Jiaoshiba Pengshui Baojing Hunan

Received: 23 November 2017

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	Articles by authors
	LI Bin
	GUO Qingyong
	LUO Qun
	HU Bowen
	JIN Changhao

Cite this article:

LI Bin,GUO Qingyong,LUO Qun, et al. Comparative analysis on geological condition of shale gas accumulation of Longmaxi Formation in eastern Sichuan Basin[J]. , 2018, 5(4): 25-32.

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http://www.zgdzdcbjb.com/EN/10.19388/j.zgdzdc.2018.04.03 OR http://www.zgdzdcbjb.com/EN/Y2018/V5/I4/25

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