四川盆地二叠系龙潭组页岩孔隙发育特征及主控因素

doi:10.11764/j.issn.1672-1926.2020.04.028

Abstract

Abstract:

In order to clarify the pore structure characteristics and main controlling factors of shale in different sedimentary facies belts of the Permian Longtan Formation （Wujiaping Formation） in the Sichuan Basin， we performed scanning electron microscopy（SEM）， mercury intrusion， nitrogen adsorption isotherm and three-dimensional focused ion beam （3D-FIB） analyses on cores in Well DYS1 of Qijiang area and the outcrop samples of the Lichuan Shaxi section， which allows us to classify the pore types， numbers and structures. The results show：（1） The tidal flat lagoon phase shale of the Longtan Formation in the Well DYS1 mainly developed coal and adjacent dark mud shale. The pore types are mainly parallel plate， splint micro cracks and clay mineral pores. The organic structure pores are relatively undeveloped， the pore size is less than 50nm， the distribution is multimodal， and the pore connectivity is medium. （2） The Wujiaping Formation of the Lichuan Shaxi section in the deep-water shed is dominated by dark shale， and the pore type is mainly composed of ink-like asphaltic organic pores. The pore size is less than 50 nm， the distribution is unimodal， and the pore connectivity is relatively good. （3） It is clear that the organic matter type， TOC content and mineral composition are the main controlling factors affecting the pore development of Longtan Formation and Wujiaping Formation. The deep shale developed kerogen type II1， the TOC and siliceous mineral content have a good positive correlation with the pore volume， and the organic pores are more developed. The tidal flat-lagoon phase coal and shale develop type III kerogen， clay mineral content and TOC are positively coupled， and positively correlated with pore volume， but clay minerals have greater influence， and organic matter pores have a smaller proportion.

Key words: Sichuan Basin, Longtan Formation/Wujiaping Formation, Shale gas layer, Pore Structure, Developmental characteristics, Main controlling factorsFoundation item：The National Science and Technology Major Project （Grand No. 2017ZX05036）.

CLC Number:

TE121.1⁺3

Fei-ran CHEN, Xiang-feng WEI, Zhu-jiang LIU, Ming-chong AO, Ji-hong YAN. Pore development characteristics and main controlling factors of the Permian marine-continent transitional shale in the Sichuan Basin[J].Natural Gas Geoscience, 2020, 31(11): 1593-1602.

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岩性（层系）	不同覆压条件孔隙度/%						孔隙度/%
岩性（层系）	5 MPa	10 MPa	20 MPa	30 MPa	40 MPa	50 MPa	减少量	压实率
煤（龙潭组）	9.40	8.91	8.59	8.36	8.18	7.95	1.45	15.43
炭质泥页岩（龙潭组）	6.90	6.47	6.04	5.82	5.68	5.53	1.37	19.86
白云质泥岩（龙潭组）	5.07	4.80	4.69	4.58	4.53	4.48	0.59	11.64
硅质页岩（龙马溪组）	6.73	6.28	6.05	5.82	5.65	5.59	1.14	16.94

Pore development characteristics and main controlling factors of the Permian marine-continent transitional shale in the Sichuan Basin

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