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Características de Permeabilidad y Controles en Lignito Rico en Fusinita

Fujing Wang¹, Geng Li^1,2,3, Wentian Mi¹

¹School of Resources and Environmental Engineering, Inner Mongolia University of Technology, Hohhot 010051, China.

|December 22, 2025

Resumen

Este estudio revela que el contenido de inertinita en el lignito impacta positivamente la permeabilidad del yacimiento, mientras que el contenido de huminita tiene una correlación negativa. La fusinita y la semifusinita son clave para la permeabilidad, pero las estructuras de poros complejas pueden conducir a una alta porosidad con baja permeabilidad en lignito rico en fusinita.

Área de la Ciencia:

Geología
Ingeniería de Petróleo
Ciencia del Carbón

Sus antecedentes:

Los carbones ricos en inertinita, dominados por fusinita y semifusinita, están muy extendidos.
Comprender las características de los poros del lignito rico en fusinita es crucial para evaluar las propiedades del yacimiento de carbón y la permeabilidad.

Objetivo del estudio:

Investigar la estructura de poros del lignito rico en fusinita de la Formación Yimin, Cuenca de Hailaer.
Analizar el impacto de la composición de macerales en la estructura de poros y la permeabilidad del yacimiento de carbón.
Elucidar los mecanismos de control geológico que influyen en estas propiedades.

Principales métodos:

Experimentos de resonancia magnética nuclear (RMN)
Pruebas de permeabilidad
Microscopía electrónica
Cuantificación de macerales

Principales resultados:

El lignito de la Formación Yimin es rico en inertinita.
La porosidad se relaciona inversamente con el contenido de huminita y directamente con el contenido de inertinita.
El contenido de huminita se correlaciona negativamente con la saturación de agua móvil y la permeabilidad; el contenido de inertinita muestra correlaciones positivas.
La fusinita y la semifusinita son los principales impulsores de la variación de la permeabilidad.
El lignito rico en fusinita exhibe relaciones no lineales de porosidad-permeabilidad, con algunas muestras mostrando alta porosidad y baja permeabilidad debido a complejas redes de poros celulares.

Conclusiones:

La composición de macerales controla significativamente la estructura de poros y la permeabilidad del lignito.
La estructura de poros del lignito rico en fusinita, particularmente su naturaleza celular, puede conducir a un comportamiento anómalo de porosidad-permeabilidad.
La evaluación del yacimiento requiere distinguir entre zonas de alta porosidad y alta permeabilidad para una optimización efectiva.

Palabras clave:

lignito fusinita permeabilidad porosidad macerales cuenca de Hailaer formación Yimin inertinita humina

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