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Influences Of Depositional Environment On Reservoir Space Of Coal In Hegang Coalfield | 42530
ISSN: 2157-7617
Journal of Earth Science & Climatic Change
Open Access
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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.