Journal of Earth Science & Climatic Change
Open Access

Abstract

The aim of this paper is to discuss pore system dominated by depositional environment. To achieve this task, we focus on pore characteristics and coal-forming environment of coal in Chengzihe Formation of Hegang coalfield and analyse internal relation between them, using a series of techniques, including scan electron microscope, energy spectrum, low temperature nitrogen adsorption method, cluster analysis. The result shows that the micropore is richly developed, but there are some differences in pore structure. We found four pore models in Hegang coalfield based mainly on difference. The pore morpholohy is increasing from model I to model IV. The open grade and scale of fissure is also increasing with increasing fissure type. It must be pointed out that the adsorption capacity of pore is enhanced, but the difficulty of desorption capacity is also increasing from model I to model IV. Notably, the study on coal facies of main coal-forming period in Hegang coalfield reveal that the water is deepening and the falling speed is accelerating from south to north. The thick and stable of coal in north are better than south when there is fan-delta. A point that we want to stress here is that pore structure and crack would be controlled by depositional environment. The phenomenon of ash is increasing, pore system is complicated, numbers and types of cracks are diversified from south to north. Based on all research cores, we conclude that reservoir space of north is more complex than south, porosity and permeability of south are stronger than north.

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