Characteristics and main controlling factors for normal pressure shale gas reservoir in Anchang syncline in northern Guizhou

doi:10.3969/j.issn.1672-7703.2024.02.005

Abstract

Abstract: The drilling results have indicated good prospects of shale gas exploration and development in the northern Guizhou area, and a major breakthrough has been made in Anchang syncline in Zheng’an area. However, there are distinct differences in shale gas production among wells, and the reservoir development zone and main controlling factors need to be further clarified. The characteristics and main controlling factors of shale gas reservoir in Wufeng-Longmaxi Formation are systematically analyzed by using wireline logging, mud logging, experimental and lab test data from six vertical pilot wells in Anchang syncline in northern Guizhou, as well as seismic and well production data. The study results show that the rock type in Wufeng-the first member of Longmaxi Formation is dominated by carbonaceous shale. The main mineral composition of the reservoir is quartz, with an average content of 58.66%, followed by clay minerals. The overall brittle mineral content is high, which is 77.19% on an average in the first member of Longmaxi Formation, and shows a significantly lower content in the upper part than that in the lower part. There are multiple reservoir space types in the high-quality shale interval in Wufeng-Longmaxi Formation, mainly including organic pores, inorganic pores and micro fractures. The average measured porosity is 3.46%, and the average permeability is 0.0022 mD, which show a medium-low porosity and ultra-low permeability reservoir. The shale is mainly Type Ⅰ organic matter and high maturity. The total organic carbon content is 4.58% and the total gas content is 4.85 m³/t. The further analysis shows that, in Anchang syncline in northern Guizhou, the favorable oxygen-poor to anoxic sedimentary environment during the deposition period of Wufeng-Longmaxi Formation laid the foundation for organic matter enrichment, a large number of organic matter pores provided a guarantee for reservoir development, and the good preservation conditions played a key role in shale gas accumulation and enrichment. The pressure coefficient is the decisive factor for shale gas production.

CLC Number:

TE112.23

Li Long, Wu Song, Li Gangquan, Wang Shengjian, Xue Zong’an, Meng Xianglong. Characteristics and main controlling factors for normal pressure shale gas reservoir in Anchang syncline in northern Guizhou[J]. China Petroleum Exploration, 2024, 29(2): 58-69.

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