织納煤田三塘向斜6号煤层气成藏条件及富集影响因素

Accumulation conditions and enrichment influencing factors of No. 6 coalbed methane in Santang Syncline, Zhina Coalfield

摘要

贵州省是中国南方煤炭和煤层气资源最富集的省份，煤系地层地质条件复杂，含气量变化大。以织纳煤田三塘向斜 6 号煤层为例，根据研究区煤矿、煤层气等＂多源、异构、多时相＂数据，提取储层组分、物性和含气性等参数，分析煤层直接顶板和底板岩性、煤岩煤质特征、热演化程度、煤层埋深、地层倾角与含气量的关系，建立煤层气富集模式。结果表明：6号煤层镜质体反射率为 2.84%∼3.06% ，厚度为 0.84∼6.75 m ，埋深为 150∼1000 m ，具备较好的生气物质基础，含气量为 4.29∼27.01 m³/t ，向斜两翼含气量差异较大。煤层直接顶板岩性中泥岩的封盖性好于粉砂岩和灰岩的；南东翼煤层含气量受煤层倾角影响较大，北西翼煤层含气量主要受工业分析组成的影响；煤层含气量随煤岩有机组分、镜质组、煤层埋深、热演化程度增加而增大，随煤岩无机组分、惰质组、煤层倾角增加而减少。研究区煤层气为向斜控气的富集模式，煤层含气量在临界深度 1000 m 附近最高。该结果为织纳煤田煤层气的勘探开发提供依据。

Abstract

Guizhou Province is the province with the richest coal and coalbed methane resources in Southern China, but the geological conditions of coal measure strata are complex and the gas content varies greatly. Taking the No. 6 coal seam in the Santang Syncline of the Zhina Coalfield as an example, according to the "multi-source and heterogeneous" data of coal mine and coalbed methane in the study area, the parameters of reservoir composition, physical properties, gas content and other parameters were extracted and digitized, Mathematical statistics and grey correlation method were used to analyze the relationship between the lithology of the direct top and bottom of the coal seam, the characteristics of coal quality, the degree of thermal evolution, the burial depth, the dip angle and the gas content, and the coalbed methane enrichment model was established. The results show that the vitrinite reflectance of No. 6 coal seam is 2.84%-3.06%, the thickness is 0.84-6.75 m, and the buried depth is 150-1000 m. The gas content is 4.29-27.01 m³/t, and the air content of the syncline wings is quite different. The capping property of coal seam direct roof lithological mudstone is better than that of siltstone and limestone. The gas content of the coal seam in the south and east flanks is greatly affected by the dip angle of the coal seam, while the gas content of the coal seams in the north and west flanks is mainly affected by the industrial analysis composition. The gas content of the coal seam increases with the increase of the organic components, vitrinite group, buried depth and thermal evolution degree of coal and rock, and decreases with the increase of inorganic components, inertinite formations and coal seam dip angles. The coalbed methane in the study area is an syncline gas enrichment mode, and the coalbed methane content is the highest near the critical depth of 1000 m, which provides a theoretical basis for the exploration and development of coalbed methane in the Zhina Coalfield.

关键词

织纳煤田 / 三塘向斜 / 龙潭组 / 煤层气 / 成藏条件 / 影响因素 / 富集模式

Key words

Zhina Coalfield / Santang Syncline / Longtan Formation / coalbed methane / accumulation conditions / influencing factors / enrichment mode

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基金资助

贵州省地质勘查资金项目(52000021MGQSE7S7K6PRP)

贵州省科技支撑项目(黔科合支撑[2023]一般369)

贵州省科技计划项目(黔科合基础-ZK[2022]一般 100)