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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
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Influences of depositional environment on reservoir space of coal in Hegang coalfield

2nd International Conference on Geology

Wang Youzhi

Institute of Daqing Oilfield Company Ltd., China

Posters & Accepted Abstracts: J Earth Sci Clim Change

DOI: 10.4172/2157-7617.C1.022

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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