Table 1 Sensitive minerals in coal.

From: Analysis of geological characteristics and potential factors of formation damage in coalbed methane reservoir in Northern Qinshui basin

Mineral Classification

typical mineral

Water and salt sensitivity

montmorillonite, ilmenite/montmorillonite interlayer mineral, chlorite/montmorillonite interlayer mineral.

Alkali sensitivity

Various clay minerals such as kaolinite, feldspar and quartz

Acid sensitivity

Hydrofluoric acid sensitivity minerals: calcite, dolomite, feldspar, quartz, zeolite, various clay minerals and mica. Hydrochloric acid sensitivity minerals: iron rich chlorite, siderite, pyrite, hematite, iron calcite, iron dolomite, biotite, magnetite, etc.

Velocity sensitivity

Clay minerals and various non-clay minerals with a particle size less than 37 μm, such as quartz, siderite, calcite, etc.

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