黔南地区下石炭统打屋坝组页岩气储层孔隙结构特征及含气性评价

doi:10.12108/yxyqc.20240105

Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 45-58.doi: 10.12108/yxyqc.20240105

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Pore structure characteristics and gas-bearing properties of shale gas reservoirs of Lower Carboniferous Dawuba Formation in southern Guizhou

YANG Bowei^1,2, SHI Wanzhong^1,2, ZHANG Xiaoming^1,2, XU Xiaofeng^1,2, LIU Yuzuo^1,2, BAI Luheng^1,2, YANG Yang³, CHEN Xianglin⁴

1. School of Earth Resources, China University of Geosciences, Wuhan 430074, China;
2. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;
3. Chengdu Research Institute of Exploration and Development, PetroChina Daqing Oilfield Company, Chengdu 610041, China;
4. Oil and Gas Survey Center, China Geological Survey, Beijing 100029, China

Received:2022-11-13 Revised:2022-12-06 Online:2024-01-01 Published:2024-01-02

Abstract

Abstract: The pore structure characteristics and gas-bearing properties of shales of Lower Carboniferous Dawuba Formation in southern Guizhou were studied by using field emission scanning electron microscopy, whole-rock X-ray diffraction analysis, and isothermal adsorption of N₂ and CO₂. The results show that:(1) Calcareous shale lithofacies and calcareous/clayey mixed shale lithofacies are developed in Lower Carboniferous Dawuba Formation in southern Guizhou, with a small amount of siliceous clay shale lithofacies developed. The shale has low organic matter abundance and high maturity.(2) The pore types of shales of Dawuba Formation in the study area include inorganic pores, organic pores and microfractures, among which inorganic pores are the dominant type. The pore size distribution of shale shows a multi-peak pattern, dominated by micropores less than 1 nm and low-value mesopores of 2.0-2.4 nm and 6.0-8.0 nm. The pore volume of the shale is mainly provided by mesopores and macropores, which control the occurrence of free gas. The specific surface area of the shale is mainly provided by micropores and mesopores, which control the occurrence of adsorbed gas.(3) The gas-bearing properties of Dawuba Formation shales in the study area are mainly controlled by pore structure and preservation conditions, and organic matters and mineral components are the main factors affecting pore structure. The organic matter content and clay mineral content have a positive effect on the development of shale pores, and the brittle mineral content inhibits the development of shale pores. The complex tectonic deformation in the study area has led to poor shale gas preservation conditions, and the preservation index can be used to qualitatively-quantitatively evaluate the preservation conditions of shale gas of Dawuba Formation and make effective classification.

Key words: shale gas reservoir, pore structure, inorganic pore, organic pore, gas-bearing properties, tectonic deformation, preservation conditions, Dawuba Formation, Lower Carboniferous, southern Guizhou

CLC Number:

TE122.1

YANG Bowei, SHI Wanzhong, ZHANG Xiaoming, XU Xiaofeng, LIU Yuzuo, BAI Luheng, YANG Yang, CHEN Xianglin. Pore structure characteristics and gas-bearing properties of shale gas reservoirs of Lower Carboniferous Dawuba Formation in southern Guizhou[J].Lithologic Reservoirs, 2024, 36(1): 45-58.

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Pore structure characteristics and gas-bearing properties of shale gas reservoirs of Lower Carboniferous Dawuba Formation in southern Guizhou

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