Study of petrographic composition and depositional environment of the coals from Queen seam of Yellendu area, Godavari valley coalfield, Andhra Pradesh

Sarate, Omprakash S.

doi:10.1007/s12594-010-0047-3

Cited by 4 publications

References 8 publications

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Sub-surface Coal Seams of Bhupalpalli and Golapalli Areas of Godavari Valley Coalfield and their Petrographic Characteristics

Sarate¹

2016

Journal of the Geological Society of India

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The research work details the maceral organization of eleven coal seams intersected at a maximum depth of 446.45 m from Bhupalpalli area of the Mulug coal belt, in Warangal district of Godavari valley. Samples for petrographic study have been collected from ten coal seams intersected between 106 m and 299 m depth range from Bore-hole No. 618 which includes, IA and its underlying I, II, Index below II, IIIB, IIIA, III, IVA, IV and Index below IV respectively. However, the coal samples from the bottom most V seam were collected from Bore-hole No. 616 encountered between 445.65 m and 446.45 m. The study has revealed that V seam is marked by vitric type and seam IVA contains coal of fusic nature. The seams I, II, Index below II, IIIB, IIIA and IV, however, are represented by mixed type of coal. Whereas, the seams IA and III have the prevalence of vitric as well as mixed coal types. IA seam has witnessed alternate oxic and anoxic moor condition and also wet moor with intermittent moderate to high flooding. All the other seams have been deposited during alternate oxic and anoxic moor conditions. The coal seams of the study area have shown a wide range of variation in vitrinite reflectance (Ro mean %). The top of III, basal part of IV and the entire Index below IV have recorded high vitrinite reflectance (Ro mean %), which ranges between 0.66-0.67% thus they have reached high volatile bituminous B stage, all the other seams show lower reflectance and therefore have attained high volatile bituminous C rank.

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Sub-surface Coal Seams of Bhupalpalli and Golapalli Areas of Godavari Valley Coalfield and their Petrographic Characteristics

Sarate¹

2016

Journal of the Geological Society of India

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Formation Environment of Main Brown Coal Seam in Xi-2 Minefield of Shengli Coalfield Based on Coal Ash Phase Analysis

Wang

Qin

Shen

et al. 2018

Journal of the Geological Society of India

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The formation environment of the main coal seam in Shengli coal mine is analyzed, and the effect of coal ash parameters on the coal-forming environment is mainly discussed according to gray component parameters combined with other coal quality test analysis data. Results show that the hydrodynamic conditions of the main coal during coal accumulation have a general pattern of strong northeast and weak southwest, and lakeside swamp is generally in the retrograde process from south to north. The No.5 coal seam is a water entry cycle, and the No.5lower coal is a water withdrawal cycle. The No.6 thick coal seam is formed in the peat swamp environment where the water is shallow and the groundwater activity is weak. The input of terrestrial debris material was most abundant in the formation period of No.5lower coal, followed by No.5 coal, and that in No.6 coal is the least. Vertically, the peat swamp environment changed from weak reduction to weak oxidation to strong reducing environment. The ash yield was low to high to low from bottom to top. The organic sulfur is the main type of sulfur in the main coal seam. The weaker the hydrodynamic condition, the higher the organic sulfur content in the reduction environment, while lower organic sulfur content in the oxidation environment. The peat swamp water of No.5lower coal is medium alkaline, and the peat swamp water of No.5 and No. 6 coals is weakly alkaline or acidic.

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2014

Coal and Coalbed Gas

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Study of petrographic composition and depositional environment of the coals from Queen seam of Yellendu area, Godavari valley coalfield, Andhra Pradesh

Cited by 4 publications

References 8 publications

Sub-surface Coal Seams of Bhupalpalli and Golapalli Areas of Godavari Valley Coalfield and their Petrographic Characteristics

Sub-surface Coal Seams of Bhupalpalli and Golapalli Areas of Godavari Valley Coalfield and their Petrographic Characteristics

Formation Environment of Main Brown Coal Seam in Xi-2 Minefield of Shengli Coalfield Based on Coal Ash Phase Analysis

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