Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (4): 26-37.doi: 10.12108/yxyqc.20250403

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics and exploration prospects of coal-rock gas reservoirs in Permian Longtan Formation in Suining-Hejiang area，Sichuan Basin

WANG Qing1,2, TIAN Chong1,2, LUO Chao1,2, ZHANG Jingyuan1,2, YANG Xue1,2, WU Wei1,2, TAO Xiayan3   

  1. 1. Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China;
    2. Sichuan Key Provincial Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610051, China;
    3. Sichuan Changning Natural Gas Co., Ltd., Yibin 644400, Sichuan, China
  • Received:2025-02-12 Revised:2025-04-02 Published:2025-07-05

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Abstract: Coal-rock gas in Permian Longtan Formation of Sichuan Basin exhibits a wide distribution range， with great resource potential. Based on macro-distribution of coal rock，and comprehensive analysis of organic geochemical，physical property-pore structure，and isothermal adsorption experiments of rock cores，the reservoir characteristics of coal-rock gas in Permian Longtan Formation of Suining-Hejiang area were studied，and its exploration prospects were evaluated. The results show that： （1）Coal rock of Longtan Formation in Suining-Hejiang area is deposited under shore-swamp environment. The coal rock is characterized by large total thickness， multiple layers， and thin single layer thickness. The main coal group is C17-20 coal， with a thickness of 1.0-5.9 m， and the single layer thickness of the main coal seam is 1.0-4.5 m.（2）Coal rock in the study area is mainly bright coal and semi-bright coal， with good coal structure， high vitrinite content and low ash content.（3）The physical properties of the coal-rock reservoirs are good，and the organic pores and inorganic pores are synergistically developed. A lot of micropores and microcracks are beneficial to the adsorption of coal-rock gas， reservoir transformation and gas seepage. The total gas content of coal rock in the study area is high，with a mass volume of 16.4-30.5 m3/t，and of which free gas accounts for 25.8%-37.1% of the total gas content. Within a certain range of buried depth， both the total gas content and free gas proportion increase with the increase of buried depth.（4）The coal-rock reservoir-cap assemblages of Longtan Formation in the study area develop well， mainly develop coal-mud assemblage and coal-sand assemblage. The coal-mud assemblage is with the best reservoir formation condition. Highyield wells have confirmed that the study area has good exploration prospects for coal-rock gas exploration. It is predicted that the favorable area of coal-rock gas is 6 431 km2， with the resource of 2.53×108 m3.

Key words: coal-rock gas, shore-swamp facies, bright coal-semi bright coal, free gas, coal-mud assemblage, Longtan Formation, Permian, Suining-Hejiang area, Sichuan Basin

CLC Number: 

  • TE122
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